硼酸铝晶须增强6061 铝复合材料的界面改性

采用溶胶凝胶C₂Al₂O₃ 涂层涂覆硼酸铝晶须方法来改善硼酸铝晶须增强6061Al 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。C₂Al₂O₃ 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。

INTERFACE MODIFICATION OF THE ALUMINUM BORATE WHISKER REINFORCED 6061Al COMPOSITE

In the present paper a sol gel γ Al2O3 coating method was employed to modify the interface properties of the aluminum borate whisker reinforced 6061Al composites. Results indicate that an alumina coating with a thickness of about 40nm can be obtained on the aluminum borate whiskers. And due to the nearly continuous brittle spinel product by aluminum borate whisker and the matrix, the structure continuity of the whiskers has been greatly destroyed after the squeeze casting process. Although γ Al2O3 coating can't totally hinder the interfacial reaction, it effectively constrains the spinel reaction and preserves the structure integrity of the aluminum borate whisker.