碳酸锂对氟金云母/硅橡胶复合材料瓷化性能的影响  

Effect of Lithium Carbonate on Ceramic Properties of Fluorophlogopite/Silicone Rubber Composites

作　　者：王焰林 赖学军[1] 李红强[1] 曾幸荣[1] WANG Yanlin;LAI Xuejun;LI Hongqiang;ZENG Xingrong(South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《橡胶工业》2020年第8期589-595,共7页China Rubber Industry

基　　金：国家自然科学基金资助项目(51573052)。

摘　　要：以氟金云母为成瓷填料,碳酸锂为助熔剂,制备可瓷化硅橡胶复合材料,研究碳酸锂用量对氟金云母/硅橡胶复合材料瓷化性能的影响。结果表明,当碳酸锂用量为3份时,氟金云母/硅橡胶复合材料的综合性能最好,经1000℃处理1 h后,其陶瓷体的三点弯曲强度达3.57 MPa。扫描电子显微镜和X射线衍射分析结果表明,1000℃时碳酸锂产生液相,将氟金云母和白炭黑粘结起来,并与氟金云母发生共晶反应,生成LiAl(SiO3)2晶体,提高了氟金云母/硅橡胶复合材料的瓷化性能。Ceramifiable silicone rubber composites were prepared by using fluorophlogopite as ceramic filler and lithium carbonate as fluxing agent,and the effect of lithium carbonate content on the ceramic properties of fluorophlogopite/silicone rubber composites was investigated.When the lithium carbonate content was 3 phr,the comprehensive performance of fluorophlogopite/silicone rubber composites was the best.When fluorophlogopite/silicone rubber composites were treated at 1000℃for 1 h,the three-point flexural strength of the obtained ceramic reached 3.57 MPa.SEM and XRD results showed that lithium carbonate produced liquid phase which could bond fluorophlogopite and silica together and take part in the eutectic reaction with fluorophlogopite to produce LiAl(SiO3)2 crystals at 1000℃,which improved the ceramic properties of fluorophlogopite/silicone rubber composites.

关 键 词：可瓷化硅橡胶复合材料 氟金云母 碳酸锂 助熔剂 瓷化性能 

分 类 号：TQ330.38+3[化学工程—橡胶工业] TQ333.93