SiO_(2f)/SiO_(2)透波复合材料硅酸钇界面相的制备及性能研究  

Preparation and Properties of Yttrium Silicate Interfacial Phase of SiO_(2f)/SiO_(2) Wave-Transmitting Composites

作　　者：马爱洁[1] 张韩楷 刘浩强 王伟[1] MA Aijie;ZHANG Hankai;LIU Haoqiang;WANG Wei(School of Materials and Chemical Engineering,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安工业大学材料与化工学院,西安710021

出　　处：《西安工业大学学报》2024年第6期679-686,共8页Journal of Xi’an Technological University

基　　金：国家自然科学基金项目(61604120)。

摘　　要：针对石英纤维增强SiO_(2)陶瓷基透波材料韧性差,强度低的问题,文中采用溶胶凝胶法制备了可兼顾复合材料韧脆性、强度和透波性能的硅酸钇界面相。探究了烧结温度,浸渍次数对复合材料弯曲强度的影响,对复合材料的弯曲强度,韧脆性和透波性能进行表征,研究结果表明,纯SiO_(2f)/SiO_(2)在700℃下浸渍烧结7次后性能最佳,弯曲强度,断裂能和介电常数分别为18.53 MPa、9.336×10^(-4) J和3.2;引入界面相后,界面相浸渍烧结2次,硅溶胶浸渍烧结3次,材料性能得到明显提升,弯曲强度,断裂能和介电常数分别提升至34.15 MPa、3.997×10^(-3 ) J·m^(-2)和2.8。For the poor toughness and low strength of quartz fiber-reinforced SiO_(2) ceramic-based wave-transmitting materials,the sol-gel method was used to prepare yttrium silicate interfacial phases that combined toughness,brittleness,strength and wave-transmitting properties of composites.The effects of sintering temperature and number of impregnation on the bending strength of the composites were investigated,and their bending strength,toughness and wave-transmitting properties were characterized.The results show that the pure SiO_(2f)/SiO_(2) has the best performance after having been impregnated and sinteried for 7 times at 700 ℃,with the bending strength,fracture energy and dielectric constant being 18.53 MPa,9.336×10^(-4) J and 3.2,respectively.After the introduction of the interfacial phase,with the interfacial phase impregnated and sintered for two times and the silica sol impregnated and sintered for three times,the properties of the composite were significantly improved,their bending strength,fracture energy and dielectric constant increasing to 34.15 MPa,3.997×10^(-3) J and 2.8,respectively.The study provides some theoretical reference for the research on and development of interfacial phases of wave-transparent ceramics.

关 键 词：无机质材料 透波材料 界面相 溶胶凝胶法 介电常数 

分 类 号：TB321[一般工业技术—材料科学与工程]