凝胶注模成型制备高性能氮化硅陶瓷(Ⅰ) 助烧剂包覆氮化硅粉料对材料性能的影响.pdf

第15卷第1期 材 料 研 究 学 报 vf)115NO2 200 oF 1年2月 CHINBSEJoURNALMATERIALSRESEARCII 200l February 凝胶注模成型制备高性能氮化硅陶瓷(I) 一助烧剂包覆氮化硅粉料对材料性能的影响+ 周龙捷， 黄勇， 谢志鹏， 易中周-，。 代建清· (1清华大学新型陶瓷和精细【艺国家重点实验室 2．云南蒙自师范高等专科学校) 摘 要 用无机盐共沉淀法在氢化硅颗粒表面包覆一层纳米级的钇铝氧化物后．粉料的分散性大大提 高，可用来制备固相体积分数为50％的悬浮体利用凝胶注模成型和气压烧结制备了氢化硅陶瓷与机械 混合加入助烧剂相比，采用包覆法加^助烧剂能明显提高氯化硅陶瓷的抗弯强度和韦泊尔模数 关键词 氯化硅 凝腔注模成型 包覆 分类号TQl74，TG39 PREPARINGCERAMICSWITHHIGH Si3N4 PERFoRMANcEsBY OFCOAfI．ING POWDER 一INFLUENCE Si3N4 oN MECHANICALPRDPERTIESoFTHE ZHOU XIE YI DAl Longjiel+。HUANGYon91 Zhipen91Zhongzhou21 Jianqin91 LabNewCeramicsandFine Key of Processing，Tsinghua (1．State University Teachers 2．Mengzi College，MengziYunnan) ABSTRACTA ofnano-sizedY—AIoxidewascoatedon salts layer Si3N4particlesbyinorganic was that of coated is better found the much thanthatofas- co-precipitation．Itdispersity powder the as as receivedone of coated withsolids Suspension powder loadinghigh50％(volumefraction) was ceramicswere and method．Itwas prepared．Si3N4 preparedbygelcastinggaspressuresintering found with aids that