【摘要】 在Sialon- SiC材料配料中引入 2 .5 %～ 3 %的球黏土 ,经 14 5 0℃× 3h的氮化烧结 ,可使材料的体积密度、抗折强度、耐压强度分别提高约 2 1%、42 %、96%,气孔率降低近 3 0 %,等同于材料 15 5 0℃× 3h的烧结性能。试验结果表明 :因球黏土由含有 3 0 %纳米级颗粒的无序高岭石微粒构成 ,其分解后产物反应活性强 ,易与其它颗粒活性烧结 ,并可与Si3N4 、AlN共同形成β’ Sialon ,或经还原氮化形成 β’ Sialon ,上述行为均促进了Sialon -SiC材料的氮化反应与烧结。更多还原

【Abstract】 The bulk density,blending strength and compressive strength can be improved about 21%,42%,96% respectively and while the porosity has been reduced by 30% when2.5%～3% ball clay was introduced into Sialon bonded SiC material. The sintering properties of Sialon bonded SiC with ball clay under 1450℃ are similar to that without ball clay under 1550℃. The reason of above phenomenon is because the substance after nanokaolinite in ball clay decomposes is so active that it can react with Si3N4 and AlN to form β’-Sialon or be reduced and nitrided to formβ’-Sialon, which can accelerate the nitridation reaction and sintering of Sialon bonded SiC material.更多还原