稀土(钇)对钨钼原子扩散系数的影响

Effect of RE (Y) on Diffusion Coefficients of Tungsten and Molybdenum Atoms

摘要:

利用双辉等离子表面冶金技术在Q235钢表面渗稀土(钇)钨钼形成共渗合金层。通过对渗层合金元素的分布进行分析，计算出钨钼原子的扩散系数和扩散激活能来分析稀土(钇)的加入对钨钼原子扩散产生的影响。结果表明：稀土(钇)的加入使钼原子在渗层中的扩散系数平均增大1.89倍。钨原子的扩散系数平均降低了0.89倍。稀土(钇)的加入使钼原子在渗层中离表面12～15, 24～25, 35～36 μm处钼原子扩散激活能分别降低了5737.72, 6511.72, 7853.38 J/mol。钨原子扩散激活能提高了998.5, 106.37, 2904.56 J/mol，稀土(钇)对钼原子具有催渗作用，对钨原子没有明显催渗作用

Abstract:

Double glow plasma surface metallurgy technology was used on the surfaces of Q235 Steel to form W-Mo-Y alloying layer. The distribution of alloying elements in the diffusion layer was analyzed. The diffusion coefficient and diffusion activation energy of tungsten and molybdenum atoms were calculated to analyze the effect of RE (Y) on the atomic diffusion of W and Mo. The results show that RE (Y) addition increases the diffusion coefficient of molybdenum atoms by 1.89 times in the diffusion layer, but reduces the diffusion coefficient of tungsten atoms by 0.89 time in average. RE (Y) addition decreases the diffusion activation energy of molybdenum atoms by 5737.72, 6511.72 and 7853.38 J/mol in the diffusion layer from the surface of 12~15, 24~25 and 35~36 μm, while increases the diffusion activation energy of tungsten atoms by 998.5, 106.37 and 2904.56 J/ mol. It is indicated that RE (Y) has a catalytic effect on molybdenum atoms but plays no obvious catalytic role in the diffusion of tungsten atoms