Si_3N_4-SiC-TiN陶瓷燃烧合成工艺研究  

Study on the combustion synthesis of Si_3N_4-SiC-TiN ceramics

作　　者：张学军[1] 郑永挺[1] 韩杰才[1] 

机构地区：[1]哈尔滨工业大学复合材料研究所,黑龙江哈尔滨150001

出　　处：《功能材料》2006年第9期1494-1495,1499,共3页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2002AA332050)

摘　　要：以TiSi2和SiC为原料,利用SHS方法合成Si3N4-SiC-TiN复相陶瓷。在不同稀释剂含量及氮气压力下进行燃烧合成,计算了毛坯转化率和产物相对密度,并对产物进行了XRD分析。结果表明,氮气压力增高有利于提高转化率及产物相对密度。反应物转化率随稀释剂含量增加而增大。孔隙率为53%(体积分数)毛坯,稀释剂SiC含量为35%(质量分数)压坯相对密度达到最大值,且当稀释剂含量高于35%(质量分数)时,SiC发生氮化反应,生成Si3N4和C。Si3N4-TiN-SiC multiphase ceramics was synthesized from TiSi2 and SiC powders by self-propagating high-temperature synthesis method. Combustion synthesis was carried out from different diluent content materials under different nitrogen pressures. The relative density of final product and conversion degree of reactant were calculated and XRD analysis was conducted. The results show that high nitrogen pressure is advantageous to the increase of conversion degree and the relative density of product. Conversion degree of reactant increased with diluent content. Maximum of relative density is obtained from 35wt% diluent content materials for the compact with 53vol% porosity, and SiC is nitrified when the diluent content is higher than 35wt%.

关 键 词：燃烧合成 Si3N4-SiC-TiN 稀释剂 

分 类 号：TQ174[化学工程—陶瓷工业]