新型聚硅氧烷浸渍裂解法制备SiO_(2f)/SiO_(2)复合材料  

Preparation of SiO_(2f)/SiO_(2) Composites with a New Polysiloxane Impregnation and Cracking Method

作　　者：陈阳 侯永昭 付洁 仲诚 朱楠楠 薛静 温广武 CHEN Yang;HOU Yongzhao;FU Jie;ZHONG Cheng;ZHU Nannan;XUE Jing;WEN Guangwu(School of Materials Science and Engineering,Shandong University of Technology,Zibo 255000,Shandong,China)

机构地区：[1]山东理工大学材料科学与工程学院,山东淄博255000

出　　处：《陶瓷学报》2023年第3期490-499,共10页Journal of Ceramics

基　　金：山东省重大创新工程(2019JZZY010440)。

摘　　要：以硅溶胶、BN纳米粉、聚酰亚胺(PI)和自制聚硅氧烷(PSO)为浸渍液,石英纤维为增强体,采用先驱体浸渍—裂解法制备SiO_(2)陶瓷基复合材料(SiO_(2f)/SiO_(2))。研究了不同界面保护下的纤维拔出情况,并对复合材料的微观结构和力学性能进行测试。结果表明,PSO具有良好的流动性和浸润性(接触角<30°),90℃开始固化,600℃以上可以完成向非晶SiO_(2)陶瓷的转变,陶瓷产率高达83%。使用PI制备的界面,有效解决了界面包裹不完整的问题,界面结合强度适宜,经过循环6次PSO浸渍—裂解后,SiO_(2f)/SiO_(2)复合材料密度达到1.75 g·cm^(-3),室温弯曲强度和弹性模量分别为(61±8)MPa和7.1 GPa,纤维被基体界面保护良好,有明显的纤维拔出。SiO_(2) ceramic matrix composites(SiO_(2f)/SiO_(2))were prepared through impregnation and cracking of silica sol as impregnation solution,with BN nano powder,polyimide(PI)and self-made polysiloxane(PSO)and quartz fiber as reinforcement agent.Pull-out behavior of the fibers with different interface protections was studied,while microstructure and mechanical properties of the composites were evaluated.It is found that PSO had good fluidity and infiltration effect(with a contact angle of 30°).After curing at 90℃,the formation of amorphous SiO_(2) can be completed at above 600℃,with a ceramic yield of 83%.The presence of PI effectively enhanced the interface packaging,resulting in desired interface bonding strength.After six cycles of PSO impregnation-cracking,density of the SiO_(2f)/SiO_(2) composite reaches 1.75 g·cm^(-3),with bending strength and elastic modulus at room temperature to be(61±8)MPa and 7.1 GPa,respectively.The fibers are well protected by the matrix interface and there is obvious fiber pull-out.

关 键 词：SiO_(2f)/SiO_(2) 先驱体浸渍裂解 聚硅氧烷 力学性能 

分 类 号：TQ174.75[化学工程—陶瓷工业]