Institute of Fundamental Technological Research
Polish Academy of Sciences

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N. Sobczak

Foundry Research Institute (PL)

Recent publications
1.  Homa M., Sobczak N., Sobczak J.J., Kudyba A., Bruzda G., Nowak R., Giuranno D., Pietrzak K., Chmielewski M., Interaction Between Liquid Silver and Graphene-Coated SiC Substrate, Journal of Materials Engineering and Performance, ISSN: 1059-9495, DOI: 10.1007/s11665-018-3503-7, Vol.27, No.8, pp.4140-4149, 2018

Abstract:
Wettability between liquid Ag and graphene-coated SiC single crystal has been investigated by dispensed drop method at T = 970 oC under vacuum accompanied with subsecond recording of the drop/substrate images (100 frames per second) by high-speed high-resolution CCD camera. Non-contact heating method coupled with capillary purification of the Ag drop procedure has been applied. Scanning electron microscopy combined with EDS analysis and scanning probe microscopy combined with Raman spectroscopy techniques has been utilized for microstructure and surface characterization of samples before and after high-temperature wetting tests. Immediately after its detachment from the capillary, the Ag drop showed non-wetting behavior (h > 90o) forming a high contact angle of h = 114o. Surface characterization of the drop surface after wettability tests evidenced the presence of graphene and Si transferred from the substrate to the top of Ag drop. These findings suggest chemical interaction phenomena occurring at the interface. Locally, an intimate contact between liquid Ag and SiC substrate was allowed by the appearance of discontinuities in the graphene layer basically produced by thermomechanical stress. Local dissolution of carbon into liquid Ag and its reorganization (by segregation, nucleation and growth) as secondary graphene layer at the Ag surface was also observed.

Keywords:
Ag/graphene, Ag/SiC, dispensed drop, sessile drop method, wetting at high temperature

Affiliations:
Homa M. - Foundry Research Institute (PL)
Sobczak N. - Foundry Research Institute (PL)
Sobczak J.J. - Foundry Research Institute (PL)
Kudyba A. - Foundry Research Institute (PL)
Bruzda G. - Foundry Research Institute (PL)
Nowak R. - Foundry Research Institute (PL)
Giuranno D. - other affiliation
Pietrzak K. - other affiliation
Chmielewski M. - Institute of Electronic Materials Technology (PL)
2.  Homa M., Sobczak N., Sobczak J.J., Kudyba A., Bruzda G., Nowak R., Pietrzak K., Chmielewski M., Strupiński W., Interaction between graphene-coated SiC single crystal and liquid copper, Journal of Materials Engineering and Performance, ISSN: 1059-9495, DOI: 10.1007/s11665-018-3340-8, Vol.27, No.5, pp.2317-2329, 2018

Keywords:
graphene, liquid Cu, Raman spectroscopy, reactivity, sessile drop, wettability

Affiliations:
Homa M. - Foundry Research Institute (PL)
Sobczak N. - Foundry Research Institute (PL)
Sobczak J.J. - Foundry Research Institute (PL)
Kudyba A. - Foundry Research Institute (PL)
Bruzda G. - Foundry Research Institute (PL)
Nowak R. - Foundry Research Institute (PL)
Pietrzak K. - other affiliation
Chmielewski M. - Institute of Electronic Materials Technology (PL)
Strupiński W. - Warsaw University of Technology (PL)
3.  Pietrzak K., Sobczak N., Chmielewski M., Homa M., Gazda A., Zybała R., Strojny-Nędza A., Effects of Carbon Allotropic Forms on Microstructure and Thermal Properties of Cu-C Composites Produced by SPS, Journal of Materials Engineering and Performance, ISSN: 1059-9495, DOI: 10.1007/s11665-015-1851-0, Vol.25, No.8, pp.3077-3083, 2016

Abstract:
Combination of extreme service conditions and complex thermomechanical loadings, e.g., in electronics or power industry, requires using advanced materials with unique properties. Dissipation of heat generated during the operation of high-power electronic elements is crucial from the point of view of their efficiency. Good cooling conditions can be guaranteed, for instance, with materials of very high thermal conductivity and low thermal expansion coefficient, and by designing the heat dissipation system in an accurate manner. Conventional materials such as silver, copper, or their alloys, often fail to meet such severe requirements. This paper discusses the results of investigations connected with Cu-C (multiwall carbon nanotubes (MWNTs), graphene nanopowder (GNP), or thermally reduced graphene oxide (RGO)) composites, produced using the spark plasma sintering technique. The obtained composites are characterized by uniform distribution of a carbon phase and high relative density. Compared with pure copper, developed materials are characterized by similar thermal conductivity and much lower values of thermal expansion coefficient. The most promising materials to use as heat dissipation elements seems to be copper-based composites reinforced by carbon nanotubes (CNTs) and GNP.

Keywords:
copper matrix composites, graphene, spark plasma sintering, thermal properties

Affiliations:
Pietrzak K. - other affiliation
Sobczak N. - Foundry Research Institute (PL)
Chmielewski M. - Institute of Electronic Materials Technology (PL)
Homa M. - Foundry Research Institute (PL)
Gazda A. - Foundry Research Institute (PL)
Zybała R. - Warsaw University of Technology (PL)
Strojny-Nędza A. - Institute of Electronic Materials Technology (PL)

Patents
Filing No./Date
Filing Publication
Autors
Title
Protection Area, Applicant Name
Patent Number
Date of Grant
pdf
387994
2009-05-11
BUP 24/2010
2010-11-22
Kowalewski Z.L., Kowalewski J., Klasik A., Sobczak N.
Device for testing shear strength of a sample of the two different materials joint
PL, Instytut Transportu Samochodowego
215374
WUP 11/2013
2013-11-29



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