Partner: Barbara Romelczyk

Warsaw University of Technology (PL)

Recent publications
1.Chmielewski M., Nosewicz S., Kurpaska Ł., Romelczyk B., Evolution of material properties during the sintering process of Cr-Re-Al2O3 composites, COMPOSITES PART B-ENGINEERING, ISSN: 1359-8368, DOI: 10.1016/j.compositesb.2016.04.065, Vol.98, pp.88-96, 2016
Abstract:

This paper constitutes an analysis of the effect of heat treatment time on the properties of Cr-Re-Al2O3 composite materials. It was found that as a result of sintering, rhenium is dissolved in chromium to create chromium-rhenium solid solution. This process is time-dependent, therefore as the time extends, the structure of material becomes homogenous, which improves its mechanical properties. Within the frame of herein presented studies, a series of technological tests have been carried out for a constant sintering temperature (1450°C) and pressure (30 MPa), with the use of a variable holding time in the maximum temperature. As a result, changes in the structure of Crsingle bondRe matrix have been determined and the resulting changes in the properties of composite. Based on those tests, optimal conditions of the sintering process have been determined from the point of view of obtaining a homogenous structure and the most beneficial properties of Cr-Re-Al2O3 composites.

Keywords:

Metal-matrix composites (MMCs), Mechanical properties, Mechanical testing, Sintering

Affiliations:
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Nosewicz S.-IPPT PAN
Kurpaska Ł.-National Centre for Nuclear Research (PL)
Romelczyk B.-Warsaw University of Technology (PL)
2.Chmielewski M., Nosewicz S., Rojek J., Pietrzak K., Mackiewicz S., Romelczyk B., A study of densification and microstructure evolution during hot pressing of NiAl/Al2O3 composite, Advanced Composite Materials, ISSN: 0924-3046, DOI: 10.1080/09243046.2013.879408, Vol.24, No.1, pp.57-66, 2015
Abstract:

Evolution of the density and the microstructure during hot pressing of NiAl/Al2O3 composite has been investigated in the present paper. In particular, the effect of the process parameters, viz. compacting pressure, sintering temperature and sintering time, on the evolution of the density of the intermetallic–ceramic composite has been studied. Evolution of the density has been related to microstructure changing. Porosity, pore structures and grains rearrangement have been analysed in microscopic observations.

Keywords:

hot pressing, sintering, intermetallic–ceramic composite, density evolution, microstructure

Affiliations:
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Nosewicz S.-IPPT PAN
Rojek J.-IPPT PAN
Pietrzak K.-other affiliation
Mackiewicz S.-IPPT PAN
Romelczyk B.-Warsaw University of Technology (PL)
3.Nosewicz S., Rojek J., Mackiewicz S., Chmielewski M., Pietrzak K., Romelczyk B., The influence of hot pressing conditions on mechanical properties of nickel aluminide/alumina composite, Journal of Composite Materials, ISSN: 0021-9983, DOI: 10.1177/0021998313511652, Vol.48, No.29, pp.3577-3589, 2014
Abstract:

The influence of hot pressing conditions on mechanical properties of nickel aluminide/alumina composite has been investigated in the present paper. In particular, effect of the process parameters, viz. compacting pressure, sintering temperature and sintering time on the evolution of density, elastic constants and tensile strength properties of the intermetallic-ceramic composite has been studied. Elastic constants, the Young's modulus and Poisson's ratio, have been evaluated using an ultrasonic testing method, and the tensile strength has been determined by a Brazilian-type splitting test. Microscopic observations of microstructure evolution complemented the experimental procedure. Experimental results have been confronted with theoretical models showing a good agreement between the data compared.

Keywords:

Hot pressing, sintering, intermetallic-ceramic composite, elastic properties, Brazilian test, tensile strength, ultrasonic method

Affiliations:
Nosewicz S.-IPPT PAN
Rojek J.-IPPT PAN
Mackiewicz S.-IPPT PAN
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Pietrzak K.-other affiliation
Romelczyk B.-Warsaw University of Technology (PL)