Si_3N_4-SiO_2-BN复相陶瓷材料的凝胶注模成型及其性能研究  

Study on Gelcasting of Si_3N_4-SiO_2-BN Ceramic Composites and Performance

作　　者：窦建鹏[1,2] 马景陶[1] 林旭平[1] 张宝清[1] 刘晓林[2] 

机构地区：[1]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084 [2]北京化工大学,北京100029

出　　处：《稀有金属材料与工程》2011年第S1期641-643,共3页Rare Metal Materials and Engineering

基　　金：国家自然科学基金重大研究计划(90916025)

摘　　要：利用凝胶注模成型法制备在Si3N4和SiO2二元体系的基础上引入BN形成三元体系的陶瓷材料,研究BN的加入量对浆料流变性能的影响,并且选用BN加入量为8%(质量分数,下同)的浆料(在具有优良的流变性能前提下)进行凝胶注模成型,并对含8%BN的浆料制成的生坯和烧结后的复相陶瓷进行性能表征。另外,实验对凝胶注模成型法中的脱模工艺进行了研究,发现按照特定的脱模顺序可保证坯体不会因收缩出现裂缝现象。Si3N4-SiO2-BN ceramic composites were prepared by gelcasting. Firstly, the effect of the BN content on the rheological property of slurry was studied. Secondly, the slurry containing 8wt% BN was chosen to prepare the green and sintered body with better performance. Then the performance of Si3N4-SiO2-BN ceramic composites was measured and characterized. Finally, demould process was studied and it is found that shrinkage cracks of the sample could be avoided by following the particular demould order.

关 键 词：复相陶瓷 凝胶注模成型 浆料 脱模 

分 类 号：TQ174.622[化学工程—陶瓷工业]