Research on Dissolution Mechanism of Multi-component Ceramic Phases in Laser Cladding Coatings

被引：1

作者：

Fu Y. ^{[1
]}

Zhao H. ^{[1
]}

Zheng L. ^{[1
]}

Qi T. ^{[1
]}

机构：

[1] School of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, Hebei

来源：

Zhongguo Jixie Gongcheng/China Mechanical Engineering | 2019年 / 30卷 / 23期

关键词：

Dissolution mechanism; Free energy change; Laser cladding; Microstructure; Multi-component ceramic phase;

D O I：

10.3969/j.issn.1004-132X.2019.23.016

中图分类号：

学科分类号：

摘要：

The laser cladding coating materials were based on iron-based powders, with the additions of TiC, WC and SiC multi-component ceramic reinforced phases. The chemical reaction direction and reaction degree in laser cladding processes were analyzed by thermodynamics according to the free energy change theory, and the dissolution mechanism of the ceramic reinforced phases was studied. The research results show that under the given processing parameters and lasers, the coating surface may produce the high temperature of about 2 000~3 000 K. Through the microstructure analysis, it is found that the ceramic materials partially or completely dissolve in the temperature ranges mentioned above, and the free Fe, Cr, Ni plasma or particles in the molten pool react with the decomposed Ti, W, Si and C elements one after another. The materials possess certain metallicity as well as strength and hardness of ceramic phases, such as FeNi2Ti, Fe-Cr-Ni-Si and other new alloy phases or solid solutions, and achieve the effectiveness of strengthening coating properties, which is the same as the results of theoretical analysis model. © 2019, China Mechanical Engineering Magazine Office. All right reserved.

引用

页码：2884 / 2889and2897

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