球黏土对Sialon-SiC材料氮化烧结性能的影响  

Effect of Ball Clay on Nitridation Sintering Performance of Sialon-SiC Material

作　　者：王瑞生[1] 王志发[1] 卜景龙[1] 王榕林[1] 宋焕巧[2] 孙加林[2] 

机构地区：[1]河北理工大学材料学院,唐山063009 [2]北京科技大学材料学院,北京100083

出　　处：《非金属矿》2005年第2期6-8,共3页Non-Metallic Mines

基　　金：国家自然科学基金资助项目 (5 0 172 0 0 7) ;河北省教育厅资助项目(2 0 0 3 2 2 2 )

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。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.

关 键 词：烧结性能 材料 黏土 无序高岭石 纳米级颗粒 SI3N4 氮化烧结 体积密度 抗折强度 耐压强度 试验结果 反应活性 氮化反应 气孔率 产物 Al 

分 类 号：TQ637.3[化学工程—精细化工] TF046.4[冶金工程—冶金物理化学]