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Fabrication procedures for carbides and nitrides with a porosity of 10-20 volume percent are described. The materials are mainly used as nuclear fuels at temperatures close to their melting point, under high thermal gradient and stress. Chemical stability and low in-service densification are required. The powder synthesis is based on carbothermic reduction of oxides. Influence of starting materials, process parameters on chemical and phase composition of the reacted materials are given. Fabrication procedures and steps during consolidation of the synthesized material are summarized. The influence of comminution procedures on particle and pore size as well as different cold pressing techniques are described. Densification kinetics during isothermal sintering and radial gradients at high temperatures are analysed and related to material microstructure and chemistry.

Additional information

Authors: RICHTER K, JRC Karlsruhe Estab. (DE);BLANK H, JRC Karlsruhe Estab. (DE)
Bibliographic Reference: Paper presented: 91st Annual Meeting of the American Ceramic Society, Indianapolis (US), April 23-27, 1989
Availability: Available from (1) as Paper EN 34601 ORA
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