(1. 浙江大学 材料科学与工程学系，杭州 310027；
2. 浙江东新密封有限公司，乐清 325604)
摘 要:
关键字: 碳化硅；氮化铝；喷雾造粒；复相陶瓷；粉体；烧结
（1. Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;
2. Zhejiang Dongxin Seals Limited Company, Leqing 325604, China）
Abstract: The SiC-AlN ceramic powders were prepared by combining aqueous slurry with fluidized spray drying, and the powder characteristics, sintering behaviors and strengthening mechanism of SiC-AlN multiphase ceramic were investigated. The results shows that the flow characteristics of SiC-AlN granulated powder is obviously promoted after spray drying and a suitable particles grade match. With the increasing of pressure, the density of green body increases by the style of ladder at the pressure range of 40−80 MPa, 80−160 MPa and 160−220 MPa, the green body is uniform and densification without hard pelleted particles above 160 MPa. The pressureless sintering SiC-AlN multiphase ceramic possesses superior sintering properties and mechanical properties. It is due to the rampart formation of AlN to SiC grain growth and the reaction of SiC and AlN to form 2H solid solution. It results in the grain fining, crack expansion producing bypass and deflection, fracture section producing tearing-open and pulling-out effects, which cooperatively improves the strength and fracture toughness of the multiphase ceramics.
Key words: silicon carbide; aluminum nitride; spray drying; multiphase ceramic; powder; sintering
