Processing and properties of Al2O3-Mo composite materials
Katarzyna Pietrzak, Dariusz Kaliński, Marcin Chmielewski Instytut Technologii Materiałów Elektronicznych, Samodzielna Pracownia Kompozytów Ceramiczno-Metalowych, ul. Wólczyńska 133, 01-919 Warszawa, Poland
Quarterly No. 2, 2008 pages 109-113
DOI:
keywords: composite materials, nanopowders, sintering, mechanical strength, hardness
abstract In this paper the results of experiments concerning the manufacturing process of Al2O3-Mo composite have been presented. The chosen properties of obtaining composites have been presented as well. The initial powders after appropriate preparation (wet mixing with ethyl alcohol agent) were sintered or hot pressed. The contents of Al2O3 and Mo in the samples of composite were 25/75, 50/50 and 75/25 in % by volume. The experiments were conducted on different grain size of ceramics particles (micro- and nanopowders). There was elaborated the kinetics of Al2O3-Mo sintering process at 16001850C temperature range. Finally the densification of specimens were conducted using pressureless sintering or hot pressing method. The technological tests allowed to obtain composite materials with high relative density (> 95% of theoretical density). There was stated that is close relation between the densities results of obtained materials, type of starting materials and technological conditions of sintering process. There was also stated that is possible obtaining of Al2O3-Mo composite materials with close related densities (independently on chemical composition) in the same technological conditions. This fact is very important in designing and creation of functionally graded materials. The parameters examine included: density, porosity, hardness and bending strength. The microstructure of obtained composite materials were characterised using optical microscopy.