以石英纤维预制件和硅溶胶为原料,采用溶胶-凝胶法制备了SiO2f/SiO2复合材料,在此基础上用尿素法制备了SiO2f/SiO2-BN复合材料,并对其力学性能和介电性能进行了测试.结果表明,随着工艺循环次数的不断增加,复合材料的密度随之提高,但增长速度逐渐减慢.三次循环后,SiO2f/SiO2-BN复合材料密度达1.81 g/cm3,弯曲强度和模量分别为113.9 MPa和36.5 GPa,分别比SiO2f/SiO2复合材料提高了12.1%和76.3%;纤维和基体界面结合良好,材料断面出现了明显的纤维拔出现象,为韧性断裂;复合材料介电常数和损耗角正切值分别为3.32和0.004,介电性能优良.
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