수성 알루미나/탄화규소 슬러리의 동결주조와 층상복합체의 제조: (II) 층상 복합체의 미세구조와 기계적 성질

Abstract

Symmetric three layer composites have been prepared by freeze casting and then pressureless sintered at in gas atmosphere. The relative sintered density of multilayer composites having microstructural characteristics of later intermediate-stage densification increased with sintering temperature and reached about 95% theoretical value at . Although the indentation strength of the multilayer composites was generally reduced with increasing Vickers indentation load up to 294N, the damage resistance of multilayer composites was superior compared to monolithic layer 95AL/5SN material. The three-point bend strength of the layered materials remained at the values 266-298 MPa after indentation with a load of 49N, while that of the monolithic 95AL/5SN material was 219 MPa. The fracture toughness of the multilayer material was .