一种SiC/Si_xO_yC_z非连续增强陶瓷基复合材料的制备及性能  

Synthesis and properties of an SiC/Si_xO_yC_z discontinuous reinforced ceramic composite

作　　者：原效坤[1] 许并社[2] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083 [2]太原理工大学材料科学与工程学院,太原030024

出　　处：《复合材料学报》2007年第1期104-109,共6页Acta Materiae Compositae Sinica

基　　金：国家973项目(2004CB217808);国家自然科学基金项目(20271037)

摘　　要：以聚硅氧烷类有机硅树脂YR3370(GE toshiba silicones)裂解生成的无定形SixOyCz陶瓷为基质,以0.8μm SiC颗粒为非连续增强介质,制备了一种SiC/SixOyCz非连续增强陶瓷基复合材料。含SiC颗粒50%的素坯在99.99%N2气流中于1100-1300℃下保温1 h,所制备的陶瓷基复合材料密度可达2.27 g/cm3,维氏硬度可达741 kg/mm2。通过结构模拟和强度计算分析了SiC/SixOyCz陶瓷基复合材料的力学性能,其结构特点是连续的无定形SixOyCz陶瓷基质包围着分散的作为非连续增强介质的SiC颗粒,基质与增强介质之间具有合理的热匹配,并且可以改善单一陶瓷材料的脆性。Using the amorphous SixOyCz ceramic pyrolyzed from polysiloxane silicon resin YR3370 （GE toshiba silicones） as the matrix, and 0.8 μm SiC particle as the discontinuous reinforcement, an SiC/SixOyCz discontinuous reinforced ceramic composite was prepared. When the biscuit contains 50% of SiC particle and is pyrolyzed in a 99.99% nitrogen flux at 1100- 1300 ℃ for 1 h, the ceramic matrix composite has a density of 2.27 g/cm^3 and a Vickers hardness of 741 kg/mm^2. The mechanics properties of the composite were discussed through structure modeling and strength calculation. The characteristic of the composite structure is that the discontinuous reinforcement SiC particles are wrapped in the continuous amorphous SixOyCz ceramic matrix, and there is reasonable thermal expansion compatibility between them, which can improve the brittleness of monolithic ceramic materials.

关 键 词：有机硅树脂 非连续增强陶瓷基复合材料 陶瓷连接 

分 类 号：TB332[一般工业技术—材料科学与工程]