基于硅树脂的封严涂层的制备及其性能研究  

Study on the Preparation and Properties of Seal Coatings Based on the Silicone Resin

作　　者：韩云利 米廪营 罗永明[2] HAN Yun-li;MI Lin-ying;LUO Yong-ming(No.5713 Factory of the Chinese PLA,Xiangyang 441002,China;The Institute of Chemistry Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]中国人民解放军第5713工厂,湖北襄阳441002 [2]中国科学院化学研究所,北京100190

出　　处：《材料保护》2021年第2期40-43,80,共5页Materials Protection

摘　　要：为开发航空发动机使用的无金属填料的低温封严涂层(300~300℃)并提高飞机发动机密封涂层的使用温度,制备了基于甲基苯基硅树脂的密封涂层。采用氯硅烷共水解的方法合成了具有高热稳定性的甲基苯基硅树脂,并采用傅里叶红外光谱(FTIR)、差式扫描量热(DSC)和热重分析法(TGA)表征了其结构、固化行为和热稳定性;理想的涂层组成为:硅树脂∶石墨∶氮化硼∶石棉(质量比)=50∶15∶5∶15,以合成的甲基苯基硅树脂为基体树脂,添加石棉、石墨和氮化硼作为填料制备了封严涂层,对其综合性能进行了分析。所得结果显示:涂层于400℃老化100 h后,粘结强度仍达到10 MPa以上;涂层具有良好的耐热冲击性,在400℃~室温之间的冷热循环次数可达50次以上。该涂层经考核验证,可以满足某型号航空发动机对低温封严涂层的要求。In order to develop the low-temperature sealing coating composed of metal-free fillers used for aeroengine and improve the service temperature of seal coating on aeroengine,a coating based the methyl-phenyl silicone resin was prepared. The methyl-phenyl silicone resin with high thermal stability was synthesized by co-hydrolysis of the mixture chloro-silane. In addition,the chemistry structure,curing behavior and thermal stability were characterized by FTIR,DSC and TGA. The optimal compositions of the coating were silicone: graphite: boron nitride:asbestos = 20: 15: 5: 15 (mass ratio). The sealing coating was prepared based the methyl-phenyl silicone resin with some fillers including of asbestos,BN and graphite,and the performance was comprehensively analyzed. Results showed that the bonding strength of the coating still reached up to 10 MPa after aging for 100 h at 400 ℃. The coating had good thermal shock resistance,and the number of hot and cold cycles between 400 ℃ and room temperature could reach more than 50 times. Besides,according to test validation,the properties of the coating could be satisfied with demand of a certain aeroengine.

关 键 词：甲基苯基硅树脂 封严涂层 耐热冲击性 冷热循环 

分 类 号：V258[一般工业技术—材料科学与工程]