奥氏体不锈钢表面双辉等离子渗锆的动力学
Kinetics of Double-glow Plasma Zr Surface Alloying on Austenite Stainless Steel
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摘要: 利用双辉等离子渗金属技术在0Cr18Ni9Ti奥氏体不锈钢表面制备了一层均匀、致密、呈良好冶金结合的渗锆合金层,并对1 060 ℃下的渗锆动力学进行了研究。结果表明:随着距锆合金层表面距离的增加,锆元素的含量呈梯度递减,扩散系数逐渐减小,而扩散激活能逐步增大;在1 060 ℃采用双辉等离子技术渗锆时,渗锆合金层表层的空位密度为2.945×(1012~1013) cm-2,与相同温度下采用常规渗金属工艺相比,提高了1~2个数量级。Abstract: A continuous and compact Zr-alloyed layer with good metallurgical bonding was prepared on 0Cr18Ni9Ti austenite stainless steel substrate surface by double-glow plasma surface alloying technology,and the kinetics of double-glow plasma Zr surface alloying at 1 060 ℃ was studied. The results show that,increasing the distance from the Zr-alloyed layer surface,the Zr element content exhibited a graded decrease trend and the diffusion coefficient decreased gradually,while diffusion activation energy increased gradually. Vacancy density of the Zr-alloyed layer surface was approximately 2.945×(1012-1013) cm-2,which increased 1 to 2 orders of magnitude comparing with that by conventional surface alloying technology at same temperature.