Dariusz Jarząbek, Ph.D., Eng.

Department of Mechanics of Materials (ZMM)
Division of Surface Layers (PWW)
position: assistant professor
telephone: (+48) 22 826 12 81 ext.: 434
room: 231
e-mail: djarz

Doctoral thesis
2013-12-18A method for investigation of fracture on the nanometer scale by use of SFM and its applications  (PW)
supervisor -- Prof. Thomas Jung, Ph.D., Dr. Habil., UoB
supervisor -- Prof. Zygmunt Rymuza, Ph.D., Dr. Habil., PW
1065
 
Recent publications
1.Dziekoński C., Dera W., Jarząbek D.M., Method for lateral force calibration in atomic force microscope using MEMS microforce sensor, ULTRAMICROSCOPY, ISSN: 0304-3991, DOI: 10.1016/j.ultramic.2017.06.012, Vol.182, pp.1-9, 2017
Abstract:

In this paper we present a simple and direct method for the lateral force calibration constant determination. Our procedure does not require any knowledge about material or geometrical parameters of an investigated cantilever. We apply a commercially available microforce sensor with advanced electronics for direct measurement of the friction force applied by the cantilever's tip to a flat surface of the microforce sensor measuring beam. Due to the third law of dynamics, the friction force of the equal value tilts the AFM cantilever. Therefore, torsional (lateral force) signal is compared with the signal from the microforce sensor and the lateral force calibration constant is determined. The method is easy to perform and could be widely used for the lateral force calibration constant determination in many types of atomic force microscopes.

Keywords:

A precise and direct method for lateral force calibration, Inaccuracy equal to approximately 2%, Wedge method is proven to give inaccurate results

Affiliations:
Dziekoński C.-IPPT PAN
Dera W.-IPPT PAN
Jarząbek D.M.-IPPT PAN
2.Jarząbek D.M., Milczarek M., Wojciechowski T., Dziekoński C., Chmielewski M., The effect of metal coatings on the interfacial bonding strength of ceramics to copper in sintered Cu-SiC composites, CERAMICS INTERNATIONAL, ISSN: 0272-8842, DOI: 10.1016/j.ceramint.2017.01.056, pp.1-9, 2017
Abstract:

Cu-SiC composites are very promising materials which have high thermal and electrical conductivity and may find many applications. Unfortunately, the main disadvantage of these materials is the dissolution of silicon in copper at elevated temperature, which significantly reduces their properties. In order to overcome this problem particles can be coated with a protective material before sintering. In this paper– the influence of three different metallic coatings on bonding strength were investigated. SiC particles were coated with tungsten, chromium or titanium. As reference a material with uncoated particles was prepared. The experiments were carried out with the use of microtensile tester. The highest increase in strength was observed in the case of chromium coating. On the other hand, the titanium coating, which was of very poor quality, decrease the bonding strength in comparison with uncoated particles. Furthermore, scanning electron and optical microscopes were used to determine the mechanism of debonding.

Keywords:

Interfacial bonding strength, Metal matrix composites, Tensile strength, Silicon carbide particles

Affiliations:
Jarząbek D.M.-IPPT PAN
Milczarek M.-Warsaw University of Technology (PL)
Wojciechowski T.-Institute of Physics, Polish Academy of Sciences (PL)
Dziekoński C.-IPPT PAN
Chmielewski M.-Institute of Electronic Materials Technology (PL)
3.Chmielewski M., Pietrzak K., Teodorczyk M., Nosewicz S., Jarząbek D., Zybała R., Bazarnik P., Lewandowska M., Strojny-Nędza A., Effect of metallic coating on the properties of copper-silicon carbide composites, APPLIED SURFACE SCIENCE, ISSN: 0169-4332, DOI: 10.1016/j.apsusc.2016.12.130, Vol.421, pp.159-169, 2017
Abstract:

In the presented paper a coating of SiC particles with a metallic layer were used to prepare copper matrix composite materials. The role of the layer was to protect the silicon carbide from decomposition and dissolution of silicon in the copper matrix during the sintering process. The SiC particles were covered by chromium, tungsten and titanium using Plasma Vapour Deposition method. After powder mixing of components, the final densification process via Spark Plasma Sintering (SPS) method at temperature 950C was provided. The almost fully dense materials were obtained (> 97.5%). The microstructure of obtained composites was studied using scanning electron microscopy as well as transmission electron microscopy. The microstructural analysis of composites confirmed that regardless of the type of deposited material, there is no evidence for decomposition process of silicon carbide in copper. In order to measure the strength of the interface between ceramic particles and the metal matrix, the micro tensile tests have been performed. Furthermore, thermal diffusivity was measured with the use of the laser pulse technique. In the context of performed studies, the tungsten coating seems to be the most promising solution for heat sink application. Compared to pure composites without metallic layer, Cu-SiC with W coating indicate the higher tensile strength and thermal diffusitivy, irrespective of an amount of SiC reinforcement. The improvement of the composite properties is related to advantageous condition of Cu-SiC interface characterized by well homogenity and low porosity, as well as individual properties of the tungsten coating material.

Keywords:

metal matrix composites, silicon carbide, metallic layers deposition, thermal conductovity, interface strength

Affiliations:
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Pietrzak K.-other affiliation
Teodorczyk M.-other affiliation
Nosewicz S.-IPPT PAN
Jarząbek D.-IPPT PAN
Zybała R.-Warsaw University of Technology (PL)
Bazarnik P.-Warsaw University of Technology (PL)
Lewandowska M.-other affiliation
Strojny-Nędza A.-Institute of Electronic Materials Technology (PL)
4.Jarząbek D.M., Gwiazda M., Dera W., The Influence of Alkali Metal Chloride Treatments on the Wear Resistance of Silicon Surfaces for Possible Use in MEMS, TRIBOLOGY TRANSACTIONS, ISSN: 1040-2004, DOI: 10.1080/10402004.2017.1296211, pp.1-7, 2017
Abstract:

The wear of contacting silicon surfaces in microelectromechanical systems (MEMS) has been a longstanding concern. To address this issue, the effects of immersing silicon surfaces into alkali metal chloride solutions (LiCl, NaCl, CsCl) on their sliding friction and wear were investigated. A custom-built reciprocating tribometer was used with a sapphire ball as the counterbody. Results indicated that the friction coefficient between the silicon surface (p-doped, orientation (100)) and a sapphire ball can be reduced by up to 30% by treating the silicon surfaces in aqueous salt solutions (concentration 1 mol/L, exposure for 24 h). These modified surfaces also have higher wear resistance and a significant change in wettability. After immersion, the contact angle between the silicon surface and water was reduced by approximately 50%. These results may lead to new, simple, and inexpensive methods to increase the wear resistance of silicon surfaces for use in MEMs devices.

Keywords:

silicon surface, wear, friction, alkali metal chlorides

Affiliations:
Jarząbek D.M.-IPPT PAN
Gwiazda M.-Warsaw University of Technology (PL)
Dera W.-IPPT PAN
5.Chmielewski M., Pietrzak K., Strojny-Nędza A., Jarząbek D., Nosewicz S., Investigations of interface properties in copper-silicon carbide composites, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.1515/amm-2017-0200, Vol.62, No.2B, pp.1315-1318, 2017
Abstract:

This paper analyses the technological aspects of the interface formation in the copper-silicon carbide composite and its effect on the material’s microstructure and properties. Cu-SiC composites with two different volume content of ceramic reinforcement were fabricated by hot pressing (HP) and spark plasma sintering (SPS) technique. In order to protect SiC surface from its decomposition, the powder was coated with a thin tungsten layer using plasma vapour deposition (PVD) method. Microstructural analyses provided by scanning electron microscopy revealed the significant differences at metal-ceramic interface. Adhesion force and fracture strength of the interface between SiC particles and copper matrix were measured. Thermal conductivity of composites was determined using laser flash method. The obtained results are discussed with reference to changes in the area of metal-ceramic boundary.

Keywords:

copper matrix composites, silicon carbide, interface, thermal conductivity, adhesion

Affiliations:
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Pietrzak K.-IPPT PAN
Strojny-Nędza A.-Institute of Electronic Materials Technology (PL)
Jarząbek D.-IPPT PAN
Nosewicz S.-IPPT PAN
6.Kucharski S., Jarząbek D., Piątkowska A., Woźniacka S., Decrease of Nano-hardness at Ultra-low Indentation Depths in Copper Single Crystal, EXPERIMENTAL MECHANICS, ISSN: 0014-4851, DOI: 10.1007/s11340-015-0105-2, Vol.56, No.3, pp.381-393, 2016
Abstract:

In the present study, we report a detailed investigation of the unusual size effect in single crystals. For the experiments we specified the hardness in single crystalline copper specimens with different orientations ((001), (011) and (111)) using Oliver-Pharr method. Our results indicates that with decreasing load, after the value of the hardness reached its maximum, it starts to decrease for very small indentation depths (<150 nm). For the sake of accuracy of hardness determination we have developed two AFM-based methods to evaluate contact area between tip and indented material. The proposed exact measurement of the contact area, which includes the effect of pile-up and sink-in patterns, can partially explain the strange behaviour, however, the decrease of hardness at low loads is still observed. At higher loads range the specified hardness is practically constant.

Keywords:

Copper, Single crystal, Nanoindentation, AFM, Size effect

Affiliations:
Kucharski S.-IPPT PAN
Jarząbek D.-IPPT PAN
Piątkowska A.-Institute of Electronic Materials Technology (PL)
Woźniacka S.-IPPT PAN
7.Jarząbek D.M., Chmielewski M., Dulnik J., Strojny-Nędza A., The Influence of the Particle Size on the Adhesion Between Ceramic Particles and Metal Matrix in MMC Composites, Journal of Materials Engineering and Performance, ISSN: 1059-9495, DOI: 10.1007/s11665-016-2107-3, Vol.25, No.8, pp.3139-3145, 2016
Abstract:

This study investigated the influence of the particle size on the adhesion force between ceramic particles and metal matrix in ceramic-reinforced metal matrix composites. The Cu-Al2O3 composites with 5 vol.% of ceramic phase were prepared by a powder metallurgy process. Alumina oxide powder as an electrocorundum (Al2O3) powder with different particle sizes, i.e., fine powder <3 µm and coarse powder of 180 µm was used as a reinforcement. Microstructural investigations included analyses using scanning electron microscopy with an integrated EDS microanalysis system and transmission microscopy. In order to measure the adhesion force (interface strength), we prepared the microwires made of the investigated materials and carried out the experiments with the use of the self-made tensile tester. We have observed that the interface strength is higher for the sample with coarse particles and is equal to 74 ± 4 MPa and it is equal to 68 ± 3 MPa for the sample with fine ceramic particles.

Keywords:

adhesion, interface strength, metal matrix composites, nanocomposites, tensile test

Affiliations:
Jarząbek D.M.-IPPT PAN
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Dulnik J.-IPPT PAN
Strojny-Nędza A.-Institute of Electronic Materials Technology (PL)
8.Jarząbek D.M., Chmielewski M., Wojciechowski T., The measurement of the adhesion force between ceramic particles and metal matrix in ceramic reinforced-metal matrix composites, COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, ISSN: 1359-835X, DOI: 10.1016/j.compositesa.2015.05.025, Vol.76, pp.124-130, 2015
Abstract:

This paper presents the method for measurement of the adhesion force and fracture strength of the interface between ceramic particles and metal matrix in ceramic reinforced-metal matrix composites. Three samples with the following Cu to Al2O3 ratio (in vol.%) were prepared: 98.0Cu/2.0Al2O3, 95.0Cu/5.0Al2O3 and 90Cu/10Al2O3. Furthermore, microwires which contain a few ceramic particles were produced by means of electro etching. The microwires with clearly exposed interface were tested with use of the microtensile tester. The microwires usually break exactly at the interface between the metal matrix and ceramic particle. The force and the interface area were carefully measured and then the fracture strength of the interface was determined. The strength of the interface between ceramic particle and metal matrix was equal to 59 ± 8 MPa and 59 ± 11 MPa in the case of 2% and 5% Al2O3 to Cu ratio, respectively. On the other hand, it was significantly lower (38 ± 5 MPa) for the wires made of composite with 10% Al2O3.

Keywords:

Nanocomposites, Metal matrix composites, Adhesion, Interface

Affiliations:
Jarząbek D.M.-IPPT PAN
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Wojciechowski T.-Institute of Physics, Polish Academy of Sciences (PL)
9.Jarząbek D.M., Siewert D., Fabianowski W., Schift H., Rymuza Z., Jung T., Influence of Alkali Ions on Tribological Properties of Silicon Surface, TRIBOLOGY LETTERS, ISSN: 1023-8883, DOI: 10.1007/s11249-015-0603-5, Vol.60, No.2, pp.1-8, 2015
Abstract:

Tribological properties of surfaces (friction, adhesion and wear) provide challenging limitations to the design of reliable machines on the micro- and nanometer scale as the surface to volume area increases and volume, mass and inertia of the mobile parts decrease. This study reports on the reduction in the friction force of silicon surfaces after the alkali metal ion exposure in the form of aqueous solutions. A scanning force microscope equipped with a liquid cell was used to investigate the friction force and the pull-off force of a flat silicon surface immersed in water and in different alkali metal chlorides solutions: LiCl, NaCl and CsCl. The concentration ranged from 0.1 up to 1000 µmol/l. The changes in the free surface energy of the initial surface and of the modified surfaces after drying were determined from contact angle measurements and from the acid–base adhesion theory. In both cases, in the liquid environment and after drying of the exposed silicon substrates in air, the friction force is reduced by approximately 50 %. Our results provide new, fundamental insight into the exchange of surface termination layers in particular for tribology. Also it is suggested to use the procedure as a low-cost alternative to improve the tribological properties of the silicon surface in particular in applications where lubricating fluids are not appropriate, e.g., in nanomachines and devices.

Keywords:

Silicon surface, Scanning force microscopy, Friction, Adhesion, Alkali metal chlorides

Affiliations:
Jarząbek D.M.-IPPT PAN
Siewert D.-Paul Scherrer Institut (CH)
Fabianowski W.-Paul Scherrer Institut (CH)
Schift H.-Paul Scherrer Institut (CH)
Rymuza Z.-other affiliation
Jung T.-Paul Scherrer Institut (CH)
10.Jarząbek D., Precise and direct method for the measurement of the torsion spring constant of the atomic force microscopy cantilevers, REVIEW OF SCIENTIFIC INSTRUMENTS, ISSN: 0034-6748, DOI: 10.1063/1.4904866, Vol.86, pp.013701-1-6, 2015
Abstract:

A direct method for the evaluation of the torsional spring constants of the atomic force microscope cantilevers is presented in this paper. The method uses a nanoindenter to apply forces at the long axis of the cantilever and in the certain distance from it. The torque vs torsion relation is then evaluated by the comparison of the results of the indentations experiments at different positions on the cantilever. Next, this relation is used for the precise determination of the torsional spring constant of the cantilever. The statistical analysis shows that the standard deviation of the calibration measurements is equal to approximately 1%. Furthermore, a simple method for calibration of the photodetector’s lateral response is proposed. The overall procedure of the lateral calibration constant determination has the accuracy approximately equal to 10%.

Keywords:

Calibration, Atomic force microscopy, Nanotechnology, Hardness, Diffraction gratings

Affiliations:
Jarząbek D.-IPPT PAN
11.Kucharski S., Jarząbek D., Depth Dependence of Nanoindentation Pile-Up Patterns in Copper Single Crystals, METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, ISSN: 1073-5623, DOI: 10.1007/s11661-014-2437-4, Vol.45A, pp.4997-5008, 2014
Abstract:

A study of the dependence of nanoindentation pile-up patterns on the indentation load and crystallographic orientation is presented. Three different orientations—(001), (011), and (111)—of single crystal copper were investigated. Experiments were conducted on a CSM ultra-nanoindentation tester using a Berkovich tip. The topographic images were obtained using an atomic force microscope. The evolution of pile-up patterns with different applied loads was observed. The results show that for applied loads equal to 0.45 mN and smaller the pile-up patterns do not depend on the crystallographic orientation of the indented surface; instead, they depend on the tip’s geometry. On the other hand, in the case of indentation loads bigger than 2 mN, pile-up patterns on the surfaces of (001)-, (011)-, and (111)-oriented single crystals have fourfold, twofold, and sixfold (or threefold) symmetry, respectively. An intermediate state was also reported. Furthermore, a detailed analysis of residual impressions with maximal applied loads equal to 2 mN and bigger reveals that both pile-up and sink-in patterns are present.

Affiliations:
Kucharski S.-IPPT PAN
Jarząbek D.-IPPT PAN
12.Jarząbek D.M., Kaufmann A.N., Schift H., Rymuza Z., Jung T.A., Elastic modulus and fracture strength evaluation on the nanoscale by scanning force microscope experiments, NANOTECHNOLOGY, ISSN: 0957-4484, DOI: 10.1088/0957-4484/25/21/215701, Vol.25, pp.215701-1-9, 2014
Abstract:

This work first reviews the capability of scanning force microscopy (SFM) to perform experiments with forces in a wide range, from low non-contact forces to high contact forces which induce mechanical deformations in the substrate. In analogy to fracture strength evaluation, as established in materials science, SFM is used to exert forces on pillars with nanometer dimensions while the cantilever deformations are monitored quantitatively. Hence, it is possible to bend the pillars until the threshold for triggering fracture is reached, and to determine the mechanical properties at the different stages of this process. Using this novel approach, in combination with 'state of the art' nanofabrication to produce nanopillar arrays on silicon and silicon dioxide substrates, a number of experiments are performed. Furthermore, quantitative measurements of the fracture strength of Si and of the SiO2/Si interface and E-modulus are presented. To analyze the experimental data obtained in the different experimental procedures and modes, finite element method calculations were used. The methods introduced herein provide a versatile toolbox for addressing a wide range of scientific problems and for applications in materials science and technology.

Affiliations:
Jarząbek D.M.-IPPT PAN
Kaufmann A.N.-Paul Scherrer Institut (CH)
Schift H.-Paul Scherrer Institut (CH)
Rymuza Z.-other affiliation
Jung T.A.-Paul Scherrer Institut (CH)
13.Abetkovskaya S.O., Chizhik S.A., Pogoskaya I.V., Rimuza Z., Jarząbek D., Mikhalovski M., Linke Ya., Determining the Young Modulus of Nanosize Thickness Coatings for MEMS from the Results of Static Force Spectroscopy, Bulletin of the Russian Academy of Sciences: Physics, ISSN: 1062-8738, DOI: 10.3103/S1062873812090031, Vol.76, No.9, pp.1009-1011, 2012
Abstract:

A method for the nanoidentation of resistance coatings 1–100 nm thick and intended for use in microelectromechanical systems is proposed on the basis of atomic-force microscopy (AFM). The elastic moduli of the coatings are determined using three models of contact: the Hertz model, the Johnson–Kendall–Roberts model and the Makushkin model, with and without allowance for the influence of a solid substrate

Affiliations:
Abetkovskaya S.O.-A.V. Lykov Heat and Mass Transfer Institute National Academy of Sciences of Belarus (BY)
Chizhik S.A.-A.V. Lykov Heat and Mass Transfer Institute National Academy of Sciences of Belarus (BY)
Pogoskaya I.V.-A.V. Lykov Heat and Mass Transfer Institute National Academy of Sciences of Belarus (BY)
Rimuza Z.-Warsaw University of Technology (PL)
Jarząbek D.-other affiliation
Mikhalovski M.-other affiliation
Linke Ya.-Warsaw University of Technology (PL)
14.Jarząbek D.M., Rymuza Z., Horiba A., Hirai Y., Development of an experimental technique for testing rheological properties of ultrathin polymer films used in nanoimprint lithography, JOURNAL OF VACUUM SCIENCE AND TECHNOLOGY B, ISSN: 1071-1023, DOI: 10.1116/1.3656377, Vol.29, No.6, pp.061603-1-6, 2011
Abstract:

A new method for the measurement of rheological properties (complex viscosity, viscosity and elasticity) of thin polymeric films is presented. The probe, which is placed on the end of an arm of a mini tuning fork, is caused to oscillate and then is put into poly(methyl methacrylate) films, whose thickness ranges from 30 nm to 1080 nm. All measured properties depend on temperature, thickness of the films, indentation depth and the molecular weight of PMMA. Complex viscosity, viscosity and elasticity are found to be lower at higher temperatures and higher with greater molecular weight. They are also lower for thicker films. The results gained from this experiment may be useful in the development of nanoimprint lithography and many other branches of nanotechnology. Furthermore, the method allows for the measurement of the rheological properties of many different thin films (nanoimprint polymers, oils, lubricants) at different temperatures

Affiliations:
Jarząbek D.M.-other affiliation
Rymuza Z.-other affiliation
Horiba A.-other affiliation
Hirai Y.-other affiliation
15.Atasoy H., Vogler M., Haatainen T., Schleunitz A., Jarząbek D., Schift H., Reuther F., Gruetzner G., Rymuza Z., Novel thermoplastic polymers with improved release properties for thermal NIL, MICROELECTRONIC ENGINEERING, ISSN: 0167-9317, DOI: 10.1016/j.mee.2011.01.080, Vol.88, pp.1902-1905, 2011
Abstract:

In the nanoimprint lithography (NIL) process the mould release is a limiting step. Regardless of the carefully designed special properties a resist may have, it has to come over this challenging process step to be employed in a NIL process. Generally, the moulds are coated with anti-sticking layers. Here, an alternative solution is developed by modification of two well established NIL polymers through integration of fluorinated additives in their formulation. An effective additive concentration window was successfully defined, in which the substrate adhesion and imprint behaviour is not influenced. Defect-free patterning down to 30 nm is possible. A release force reduction of about 40% was observed with the modified polymer mr-I 7000R compared to the unmodified original

Keywords:

NIL polymers, Fluorinated additives, Release forces

Affiliations:
Atasoy H.-other affiliation
Vogler M.-other affiliation
Haatainen T.-other affiliation
Schleunitz A.-other affiliation
Jarząbek D.-other affiliation
Schift H.-Paul Scherrer Institut (CH)
Reuther F.-other affiliation
Gruetzner G.-other affiliation
Rymuza Z.-other affiliation

List of chapters in recent monographs
1.
548
Jarząbek D., Michałowski M., Characterization of Polymeric Biomaterials, rozdział: Surface mechanical properties, Woodhead Publishing (an imprint of Elsevier), United Kingdom, pp.255-279, 2017
2.
509
Jarząbek D.M., Dera W., Ceramic Matrix Materials - Materials, Manufacturing and Engineering, Series: Advanced Composites, rozdział: The measurement of mechanical properties of interfaces in ceramic composites, Walter de Gruyter GmbH, Berlin/Boston, Printed in Germany, 5, pp.77-108, 2016

Conference abstracts
1.Frąś L.J., Jarząbek D., Dziekoński C., Pęcherski R.B., Viscoplastic deformation of magnethoreological solids, SolMech 2016, 40th Solid Mechanics Conference, 2016-08-29/09-02, Warszawa (PL), No.P244, pp.1-2, 2016
Abstract:

The microsized (~10µm) ferroelements build the structure of magenthoreological (MR) fluid. This two phase material in neutral state behaves as a fluid but in magnetic field becomes a solid and has properties of elasto-viscoplastic material. This is due to the skeleton made by ferrolements connected into braids. The aim of the paper is to identify the physical mechanisms of deformation of such a structure with use of own set up for in situ microscopic observations.

Keywords:

magnethoreological solids, viscoplasticity, ferroelements, compression test, shear banding

Affiliations:
Frąś L.J.-IPPT PAN
Jarząbek D.-IPPT PAN
Dziekoński C.-IPPT PAN
Pęcherski R.B.-IPPT PAN
2.Jarząbek D., Chmielewski M., Wojciechowski T., The measurement of the adhesion force between ceramic particles and metal matrix in ceramic reinforced-metal matrix composites, EUROMAT 2015, European Congress and Exhibition on Advanced Materials and Processes, 2015-09-20/09-24, Warszawa (PL), pp.1, 2015
Abstract:

This paper presents the method for measurement of the adhesion force and fracture strength of the interface between ceramic particles and metal matrix in ceramic reinforced-metal matrix composites. Three samples with the following Cu to Al 2 O 3 ratio (in vol.%) were prepared: 98.0Cu/2.0Al 2 O 3 , 95.0Cu/5.0Al 2 O 3 and 90Cu/10Al 2 O 3 . Furthermore, microwires which contain a few ceramic particles were produced by means of electro etching. The microwires with clearly exposed interface were tested with use of the microt ensile tester (Fig. 1). The microtensile tester consists of two stages, to which two endings of the microwire are fixed. The first stage is able to measure force with the precision equal to 0.1 mN. The microwires usually break exactly at the interface between the metal matrix and ceramic particle. The force and the interface area were carefully measured and then the fracture strength of the interface was determined. The strength of the interface between ceramic particle and metal matrix was equal to 59 ±8 MPa and 59±11 MPa in the case of 2% and 5% Al 2 O 3 to Cu ratio, respectively. On the other hand, it was significantly lower (38±5 MPa) for the wires made of composite with 10% Al2O3

Affiliations:
Jarząbek D.-IPPT PAN
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Wojciechowski T.-Institute of Physics, Polish Academy of Sciences (PL)
3.Jarząbek D.M., Dera W., Rymuza Z., The measurement of viscosity of ultrathin polymer films, EUROMAT 2015, European Congress and Exhibition on Advanced Materials and Processes, 2015-09-20/09-24, Warszawa (PL), pp.1, 2015
Abstract:

Viscosity is a very important property of thin polymer films used in modern microelectronic technology i.e. in nanoimprint lithography. Hence, in this work we present a method for viscosity of ultrathin polymer films determination. The viscosity is evaluated from the response of the oscillating piezoelectric cantilever at the end of which an indentation probe is mounted (Fig. 1a). When a polymer film is indented, the resonant frequency of the oscillations is changed and the parameters of used model (i.e. Maxwell model) can be identified. The frequency of the oscillations is equal to tens of kilohertz therefore the influence of extremely high deformation velocities can be investigated by means of this method. It is also possible to conduct the experiments in elevated temperature (up to 150 o C). The oscillations direction can be parallel as well as perpendicular to the fil m’s surface. The investigated films were made of PMMA. Their thickness ranges from a few nanometers up to 1 micrometer. The results were compared with other methods of the viscosity determination: the investigation of the creep response during nanoindentation, sinus mode nanoindentation and atomic force microscope based technique

Affiliations:
Jarząbek D.M.-IPPT PAN
Dera W.-IPPT PAN
Rymuza Z.-other affiliation
4.Strojny-Nędza A., Pietrzak K., Jarząbek D.M., Gładki A., Correlation between preparing conditions, starting materials morphology and the interface structure of the Cu-Al2O3 composites, EUROMAT 2015, European Congress and Exhibition on Advanced Materials and Processes, 2015-09-20/09-24, Warszawa (PL), pp.1, 2015
Abstract:

Copper/alumina composites with different volume content are used where high thermal conductivity, high absorption and dissipation of heat, high resistance to thermal fatigue and good frictional wear resistance are required. The properties of these composites depend on the content, shape and distribution of the ceramic phase in metal matrix. All these conditions have influence on said properties and, in consequence, on the future applications of the final material. In the technology of thruster and components in aircraft engines composite materials powder preparation process becomes very important. It should assure the uniform distribution of reinforcement in the matrix and eliminate of any agglomerates which cause the formation o f porosity in the final product . The aim of this paper is elaboration of the mechanical alloying conditions for composite powder consists of copper as a plastic matrix and brittle aluminium oxides as a reinforcement phase. The materials by compositions Cu - 5 vol. %Al 2 O 3 and Cu -15 vol. %Al 2 O 3 were obtained by hot pressing technique. The research methodology includes a microstructure analysis of composites structures, its con nection with the strength of Cu/ Al 2 O 3 interfaces . The results also were analyzed and discussed in terms of the effects of different form of aluminium oxide powder (α -Al 2 O 3 and electrocorundum ) on the composites properties

Affiliations:
Strojny-Nędza A.-Institute of Electronic Materials Technology (PL)
Pietrzak K.-other affiliation
Jarząbek D.M.-IPPT PAN
Gładki A.-other affiliation
5.Jarząbek D.M., Chmielewski M., Wojciechowski T., The measurement of the adhesion force between ceramic particles and metal matrix in ceramic reinforced-metal matrix composites, Nanomechanical Testing in Materials Research and Development V, 2015-10-04/10-09, Albufeira (PT), pp.1, 2015
6.Jarząbek D.M., Dera W., Rymuza Z., The measurement of viscosity of ultrathin polymer films, Nanomechanical Testing in Materials Research and Development V, 2015-10-04/10-09, Albufeira (PT), pp.1, 2015

Patents
Numer/data zgłoszenia patentowego
Ogłoszenie o zgłoszeniu patentowym
Twórca / twórcy
Tytuł
Kraj i Nazwa uprawnionego z patentu
Numer patentu
Ogłoszenie o udzieleniu patentu
pdf
419571
2016-11-23
-
-
Jarząbek D., Dera W., Dziekoński C.
Urządzenie do pomiaru lepkości cienkich warstw materiałów lepkosprężystych
PL, Instytut Podstawowych Problemów Techniki PAN
-
-
-
411559
2015-03-12
BUP 20/2016
2016-09-26
Jarząbek D.
Metoda pomiaru siły adhezji na jednostkę powierzchni w kompozytach ceramiczno - metalowych oraz przyrząd do pomiaru siły adhezji.
PL, Instytut Podstawowych Problemów Techniki PAN
-
-
-