Nonoxide ceramic materials
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For densification of non-oxide ceramic powders high temperatures are needed because of the character of chemical bonding. To enable hot consolidation of non-oxides, additives are used which create conditions for liquid phase sintering. Since the existing liquid phase degrades their properties at high temperatures different methods can be used to eliminate the liquid phase from the system. The possibilities of preparation of single and multi-component ceramics on the basis of Si3N4 and SiC were analyzed, in the presence of additives from SiO2-Al2O3-X(2)O(3) system (X = Y, Sm, Dy, Nd), by applying pressureless sintering and hot pressing procedures. Properties of dense ceramics were discussed in connection with their phase composition and microstructure.
Keywords:nonoxides / silicon nitride / silicon carbide / densification
Source:Materials Science Forum, 1996, 214, 223-230
- Advanced Materials for High Technology Applications, 1st Yugoslavian Advanced Materials Conference - Advanced Materials 95 on Challenges of Tomorrow, Sep 18-22, 1995, Herceg Novi, Yugoslavia