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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12～15,24～25,35～36μm处钼原子扩散激活能分别降低了5737.72,6511.72,7853.38J/mol。钨原子扩散激活能提高了998.5,106.37,2904.56J/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。
The surface of Q235 steel is infiltrated with rare earth (yttrium) tungsten and molybdenum to form a common-permeability alloy layer by using double-hull plasma surface metallurgy technology. By analyzing the distribution of alloying elements, the diffusion coefficient and diffusion activation energy of tungsten and molybdenum atoms were calculated to analyze the influence of rare earth (yttrium) addition on the diffusion of tungsten and molybdenum atoms. The results show that the addition of rare earth (yttrium) increases the diffusivity of molybdenum atoms in the diffusion layer averaging 1.89 times. The diffusion coefficient of tungsten atoms decreased by an average of 0.89 times. The addition of rare earth (yttrium) reduced the diffusion activation energy of molybdenum atoms at the surface of 12-15, 24-25 and 35-36 μm in the diffusion layer by 5737.72, 6511.72 and 7853.38 J / mol, respectively. The activation energy of tungsten atom diffusion increased by 998.5,106.37,2904.56 J / mol, the rare earth (yttrium) has a catalytic role of infiltration of molybdenum atoms, no significant role in the tungsten catalyst.