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采用溶胶凝胶γ- Al2 O3涂层涂覆硼酸铝晶须方法来改善硼酸铝晶须增强 60 61 Al复合材料的界面性能。结果表明 :试验采用的涂覆工艺可以在硼酸铝晶须表面获得 40 nm厚的氧化铝涂层。硼酸铝晶须与铝合金基体在压铸过程中生成的几乎连续的脆性尖晶石产物使晶须连续性结构损伤严重。γ- Al2 O3涂层虽然不能完全阻止界面反应的发生 ,但是却有效地抑制了尖晶石界面反应 ,保持了硼酸铝晶须的结构完整性。
The method of coating aluminum borate whisker with sol-gel γ-Al 2 O 3 coating was used to improve the interface properties of aluminum borate whisker reinforced 60 61 Al composites. The results show that the coating process used in the experiment can obtain a 40 nm thick aluminum oxide coating on the surface of aluminum borate whiskers. The nearly continuous brittle spinel product produced during the die-casting process between the aluminum borate whisker and the aluminum alloy substrate severely damaged the continuity of the whisker structure. Although γ-Al 2 O 3 coating can not completely prevent the interfacial reaction, it effectively restrains the spinel interfacial reaction and maintains the structural integrity of aluminum borate whiskers.