ZHAO Lin 1, ZHANG Yujun 2, XIE Zhipeng 1,3, WANG Chang’an 1,3
(1. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 2. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, Shandong, China; 3. State Key Laboratory of New Ceramic and Fine Processing, Tsinghua niversity, Beijing, 100084, China)
Abstract: Si3N4/SiC composites were prepared with Si powder as a sintering aid by reaction sintering method. The influence of Si addition and sintering time on the property of Si3N4/SiC composites was researched. X-ray diffractometer and material testing machine were used to test phase composition and mechanical properties, respectively. The results show that flexural strength and fracture toughness of Si3N4/SiC composites could reach 348 MPa and 4.82 MPa · m1/2 when Si addition and sintering time were 40% and 1600 ℃, respectively. It is due to the improving of density, the increase of Si3N4/particles by in situ formation, and the dispersion toughening of Si3N4 particles in SiC atrix material.
Key words: reaction sintering;Si3N4/SiC composites; in situ formation