低温溶胶-凝胶法制备高致密度碳化硅陶瓷工艺研究  

Studies on Process Conditions for Preparing of Silicon Carbide Ceramics with High Relative Density by the Sol-gel Method

作　　者：水淼 宋岳[1,2] 舒杰[1,2] 王青春 黄锋涛[1,2] 任元龙 

机构地区：[1]宁波市新型功能材料及其制备实验室-省部共建国家重点实验室培育基地 [2]宁波大学材料科学与化学工程学院,浙江宁波315211

出　　处：《化学通报》2010年第4期365-370,共6页Chemistry

基　　金：浙江省自然科学基金项目(Y407058);宁波市科技计划项目(2006B100064;2008A610060)资助

摘　　要：以柠檬酸为螯合剂,用溶胶-凝胶法制备碳化硅陶瓷烧结前驱粉体,在烧结助剂含量6%、铝钇摩尔比5/3、1850℃低烧结温度烧结1h条件下,获得了体密度为3.219g/cm3、相对密度为98.3%的高致密烧结体,采用IR、XRD、TG/DTA、SEM/EDS等手段对前驱粉体及烧结体进行了表征,讨论了烧结助剂含量、烧结温度等对碳化硅陶瓷烧结体的收缩率、体密度、失重率等特性的影响。SiC /YAG composite precursor was synthesized by the sol-gel method with citric acid as a chelating agent,the silicon carbide ceramic product with density 3. 219g /cm3 and relative density 98. 3% was obtained under the conditions of 6% sintering agent and Al / Y in 5 /3 mole ratio at really low sintering temperature 1850℃ for 1 h. The precursor and ceramic product were characterized by IR、XRD、TG /DTA、SEM /EDS measurements. Effects of the content of sintering agent and sintering temperature on contraction ratio,bulk density and weight loss of the sintered silicon carbide ceramics were analyzed.

关 键 词：碳化硅 烧结助剂 溶胶-凝胶法 柠檬酸 

分 类 号：TQ174.6[化学工程—陶瓷工业]