METHOD OF MAKING CERMETS OF HIGH STATIC AND DYNAMICAL STRENGTH

摘要

1,238,166. Cermets. KERNFORSCHUNG m.b.H. GES FUER. 18 March, 1969 [23 March, 1968], No. 14258/69. Heading C1J. [Also in Division C7] Cermets containing 10-50% by volume of metal of 95-100% theoretical density (the ceramic being of 85-100% of its theoretical density) are obtained by vibrating metal coated ceramic particles of 20-500 Ám size in metallic capsules which are welded air tight then compacting them with particles, e.g. Al 2 O 3 , by isotactic pressing at 100-1000 kg/cm.SP2/SP and 1000-1700‹ C. Metals specified are Mo, Cr, V and austenitic chrome steels whilst ceramics are uranium dioxide and actinide metal oxides. The filled capsules are packed around with A 2 O 3 particles in an autoclave, which is evacuated and helium introduced as a heat end pressure transfer medium.