CeO2对镍基金属陶瓷激光熔覆层组织和耐磨蚀性能的影响

Effect of Cerium Dioxide on the Structure and Wear-Resistance of Laser Cladding Ni-Based Cement Composite Coating

稀土元素能改善金属表面溶覆层的组织结构及性能,尤其是耐磨、耐蚀及抗高温氧化性能。采用CO2横流激光器在45钢基体表面熔覆不同稀土氧化物(CeO2)含量的镍基TiC金属陶瓷复合层,对熔覆层进行了显微组织观察、显微硬度测量、耐磨性能和耐腐蚀性能测试。结果表明:加入适量的稀土氧化物CeO2(0.6%)可有效地减少复合层中的裂纹、孔洞和夹杂物,促进晶粒细化,提高熔覆层的组织均匀性及表面硬度,并且明显地改善了熔覆复合层的耐磨及耐蚀性能。

A CO2 laser facility was performed to prepare Ni-based cement composite coatings with different content of CeO2 on the surface of AISI-1045 steel.The microhardness of the Ni-based ce-ment composite coatings was measured,and their microstructures and wear-resistance and corrosion-resistance were investigated.In particular,the effect of rare-earth oxide Ce02on the wear-resist-ance and corrosion-resistance and antioxidation ability of the com-posite coating was highlighted.Results showed that the introduction of a small amount of CeO2(0.6%)led to considerable de-crease of cracks,holes and entrapped impurities in the cement composite coatings.It also contributed to decrease the grain size,promote the uniformity of the microstructure,increase the microhardneas,and significantly improve the wear-resistance and corro-sion-resistance of the cement composite coatings.