Sialon/SiC复相材料的组织与性能

Microstructure and Properties of Sialon/SiC Composites

研究了利用粘土、SiC为主要原料 ,直接合成的Sialon/SiC复相耐火材料的相组成和显微组织 ,并研究了材料中Sialon含量对复相材料的密度、抗折强度、耐压强度和热震稳定性的影响·结果表明 ,复相材料的抗折强度和耐压强度均随Sialon相含量的增加而增加 ,最大抗折强度为87 6MPa ,最大耐压强度为 193MPa ;材料的体积密度随材料中Al2 O3 残余相含量的增加而增加 ,材料的最大体积密度为 2 6 5 g/cm3;材料的热震稳定性随Sialon相含量的增加而下降 ;材料的显微组织为Sialon和Al2 O3 形成的连续基质相包裹着SiC颗粒的显微复合组织·

The microstructure and mechanical properties of Sialon/SiC composites directly synthesized by using clay and silicon carbide were studied. The effect of Sialon content on the materials density, flexural strength,compressive strength and thermal shock resistance was studied. With the increasing of Sialon content, the flexural strength and compressive strength of the materials increase,but the ability of thermal shock resistance decrease. The best flexural strength is 87 6?MPa, and the best compressive strength is 193?MPa. The bulk densities increase with the increasing of remnant content of alumina in materials. The best bulk density is 2 65?g/cm 3. The microstructure of the material is that SiC pellet is surrounded with base phases containing long stick form Sialon and small alumina particle.