用PEO优化氧化铝涂层的同素异形体和硬度
Optimization of allotropic and hardness of aluminum oxide coating by PEO
摘要：
等离子体电解氧化（PEO）是生产材料和氧化物涂层的最重要方法之一。用PEO法在铝上制备的涂层具有$α$ -Al $_2$ O $_3$和$γ$ -Al $_2$ O $_3$两种同素异形体.含$α$ $_2$ O $_3$的涂层具有更高的硬度和耐磨性;因此，本研究的主要目标是优化氧化铝同素异形体，以提高PEO法制备的涂层中$α$ $_2$ O $_3$的比例。本研究的结果表明，制备最高相$α$ O $_3$的最佳电解质化合物为2.9 g/l KOH，1.15 g/l Na 4 P 2 O 7，和0.34 g/升的NaAlO 2，以及$α$ O $_3$的最高同素异形拨片与$γ$ $_2$ O $_3$的最高同素异形拨片的比率在最佳工艺条件下，其XRD测试值为0.622，维氏硬度为1648。
英文摘要：
One of the most important methods of producing materials and oxide coating is plasma electrolytic oxidation (PEO). Coatings made on aluminum in PEO method have two allotropes of $α$-Al$_2$O$_3$ and $γ$-Al$_2$O$_3$. Coatings containing $α$-Al$_2$O$_3$ have more hardness and wear resistance; therefore, the main goal of the present study is to optimize aluminum oxide allotrope for increasing the ratio of $α$-Al$_2$O$_3$ in coating made with PEO method. Results of the present study shows that the optimum electrolyte compound for making highest phase of $α$-Al$_2$O$_3$ has 2.9 g/lit of KOH, 1.15 g/lit of Na4P2O7, and 0.34 g/lit of NaAlO2 and ratio of highest allotropic pick of $α$-Al$_2$O$_3$ to highest allotropic pick of $γ$-Al$_2$O$_3$ (in XRD test) in the optimum condition is 0.622 and hardness is 1648 Vickers.
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