【摘要】 使用Ｘ射线衍射仪和显微硬度计测定了ＬＹ１２铝合金微等离子体氧化陶瓷膜沿深度方向 的相分布及显微硬度变化曲线．结果表明，铝合金微等离子体氧化陶瓷膜主要由 α－Ａｌ_２Ｏ_３、γ－ Ａｌ_２Ｏ_３相组成，从表层到里层，α－Ａｌ_２Ｏ_３相含量逐渐增加．膜的显微硬度沿深度方向变化同 α－ Ａｌ_２Ｏ_３含量变化一致，致密层中显微硬度大于 ＨＶ１５００，极值点达到 ＨＶ２３００．更多还原

【Abstract】 The phase and microhardness distributions in ceramic coating formed by microplasma oxidation on LY12 aluminum alloy were investigated using X - ray diffractometer and microhardness tester. The results show that the ceramic coating contains mainly a - Al₂ O₃, y - A1₂ O₃ phases, and the a - A1₂ O₃ content gradually increases from outer layer to inner layer of coating. The change of microhardness in different depth of coatings is consistent to the change of a - A1₂O₃ content. The microhardness in compact layer is over 1500HV, and its maximum value can reach 2300HV.更多还原