溶胶-凝胶Al_2O_3涂层石英纤维增强甲基硅树脂基复合材料的制备

Preparation of Al_2O_3 coating quartz fiber reinforced methyl silicon resin composites by means of sol-gel technique

采用溶胶-凝胶法在石英纤维的表面涂敷Al2O3涂层,用AFM对涂敷后纤维的表面形貌进行了研究,并通过束丝拉伸强度的测试优化了Al2O3涂层热处理工艺条件,着重分析了Al2O3涂层对石英纤维增强甲基硅树脂复合材料界面性能的影响。结果表明,Al2O3涂层在500℃下可有效隔绝石英纤维与树脂基体之间的反应,改善复合材料的界面强度,提高复合材料的层间剪切性能。经400、600℃热处理后的Al2O3涂敷石英纤维增强复合材料的层间剪切强度分别为8.2、5.4 MPa,分别是未涂敷复合材料的3.4倍和2.3倍。

Al2O3 was coated on the surface of quartz fiber by using sol-gel technique. The surface morphology of coated quartz fiber was investigated by means of atomic force microscopy （AFM）. The process conditions of Al2O3 coating were optimized by measuring bundle tensile strength. The effect of Al2O3 coating on the interracial properties of the composites was emphatically analyzed. The results show that Al2O3 coating can effectively inhibit the reaction between the fiber and the matrix at 500℃, and improve interracial strength and interlaminar shear property of the composites. The interlaminar shear strength of Al2O3 coating quartz fiber reinforced composites treated at 400℃ and 600℃ is up to 8.2 MPa and 5.4 MPa respectively, which is about 3.4 times and 2.3 times than that of the uncoated composites.