韦文竹
,
高原
,
张维
,
王成磊
,
陆小会
,
张光耀
稀有金属材料与工程
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0～5 μm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5.19kJ/mol,使得90 μm处W、Mo原子的扩散激活能分别降低32.20和10.83 kJ/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.
关键词:
菲克第二定律
,
阿尼乌兹公式
,
origin数值软件
,
扩散
,
扩散激活能
X.K. Tao
,
X.Cong
,
R.S. Peng
,
J.Liu and Z.Y. Liu Tianjin Institute of Technology
,
Tianjin 300191
,
China
金属学报(英文版)
This paper investigates the effect of rare earth elements on the kinetic process, microstructure and mechanical properties of vanadization in borax bath. The results show that addition of rare earth elements to vanadizing agent has obvious catalytic effect on the rate of vanadization, which has been enchanced by 30%. The wear and corrosion resistance of vanadium carbide layer were prompted by the addition of rare earth to the agent. Through increasing vanadium potential of the agent, activating the surface of workpieces and decreasing the activation energy of diffusion of carbon, rare earth elements accelerate the rate of vanadization process.
关键词:
rare earth elements
,
null
,
null
