采用热压烧结工艺，通过合理的组成设计和烧结温度控制，制备出了高性能SiC-AlN复相陶瓷，在较佳条件下，复合材料的室温强度、断裂韧性、显微硬度分别高达1130MPa、6．2MPa·m1/2、28．6GPa．显微结构研究表明，随着AlN的加入，复合材料的晶粒尺寸明显细化，并呈多层次效应，即由固溶体的形成所引起的一次晶粒细化和晶内亚晶界所引起的二次晶粒细化．
High performance SiC-AlN composites were prepared by hot-pressing with α-SiC as starting powder. The effects of composition and sintering temperature on the properties
of the materials were investigated, and SiC-5vol% AlN composites exhibited superior mechanical properties, with flexural strength, fracture toughness and Vickers
hardness of 1130MPa, 6.2MPa·m1/2 and 28.6GPa respectively. Microstructural observations revealed that the grain size of SiC-AlN composites was obviously
inhibited and refined due to the formation of solid solutions and the development of subgrain boundaries in matrix SiC grain.
参考文献
| [1] | Mcmurtry C H, et al. Am. Ceram. Soc. Bull., 1987, 66 (2): 325. 2 Wei G C, Cecher P F. J. Am. Ceram. Soc., 1984, 67 (8): 571. 3 Janney M A. Am. Ceram. Soc. Bull., 1987, 66 (2): 322. 4 Landon M, Thevenot F. Ceramics International, 1991, 17, 97. 5 Zangvil A, Ruh R J. Am. Ceram. Soc., 1988, 71 (10): 884. 6 Rafaniello W, et al. J. Am. Ceram. Soc., 1983, 66 (4): 272. 7 Sakai M. J. Jan. Ceram. Soc., 1991, 99 (10): 983. 8 Chen Y W, et al. J. Am. Ceram. Soc., 1990, 73 (9): 2585. |
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