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采用等离子渗金属技术在碳钢表面形成W-Mo共渗层和W-Mo-Dy共渗层,利用origin数值软件、菲克第二定律、阿累尼乌兹公式分析W、Mo、Dy在共渗中的动力学行为。结果表明:在表面0~5μm处,由于稀土Dy的加入使W、Mo原子的扩散系数分别提高了0.94倍和0.62倍,在80μm处,W-Mo-Dy共渗较W-Mo共渗W、Mo原子的扩散速度分别提高了2.87倍和1.07倍;稀土Dy的加入使表面5μm处的W、Mo原子的扩散激活能分别降低7.13和5.19k J/mol,使得90μm处W、Mo原子的扩散激活能分别降低32.20和10.83 k J/mol。在相同工艺条件下,W-Mo-Dy共渗表层控制扩散的主要因素是空位浓度,在次表面稀土Dy可降低W、Mo的扩散激活能。
W-Mo co-diffusion layer and W-Mo-Dy co-diffusion layer were formed on the surface of carbon steel by plasma infiltration metal technology. Using the numerical software of origin, Fick’s second law and Arrhenius formula to analyze W, Mo, Dy Kinetics in co-infiltration. The results show that the diffusivities of W and Mo atoms increase by 0.94 and 0.62 times respectively at the surface of 0-5 μm due to the addition of rare earth Dy, , And the diffusion speed of Mo atom increased by 2.87 and 1.07 times, respectively. The addition of rare earth Dy decreased the diffusion activation energy of W and Mo atoms at surface 5μm by 7.13 and 5.19k J / mol, respectively, Diffusion activation energy decreased by 32.20 and 10.83 kJ / mol, respectively. Under the same process conditions, the main factor controlling the W-Mo-Dy co-infiltration is the vacancy concentration. On the sub-surface, rare-earth Dy can reduce the W and Mo diffusion activation energy.