Effect of different Nd2O3 contents on performances of rare earth active bioceramic gradient coating produced by wide-band laser cladding

被引：1
|
作者：
Wang Z. [1 ]
Liu Q. [1 ,2 ]
Xiao M. [1 ]
Yang B. [3 ]
机构：
[1] College of Materials and Metallurgy, Guizhou University, Guiyang
[2] Guizhou Key Laboratory for Microstructure and Strength of Materials, Guiyang
[3] Engineering Research Center in Biomaterials, Sichuan University, Chengdu
来源：
Zhongguo Jiguang/Chinese Journal of Lasers | 2011年 / 38卷 / 05期
关键词：
Bioactivity; Corrosion resistance; Gradient coating; Laser processing; Rare earth oxide Nd[!sub]2[!/sub]O[!sub]3[!/sub; Wide-band laser cladding;
D O I：
10.3788/CJL201138.0506003
中图分类号：
学科分类号：
摘要：
To decrease the thermal stress and raise the bonding strength between substrate and bioceramic coating during laser cladding, a rare earth active bioceramic gradient coating is designed. The rare earth active gradient bioceramic coating with HA and β-TCP on TC4 allloy is prepared by using wide-band laser cladding technique. The microstructure, bioactivity and corrosion resistance of bioceramic coating are analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD), simulated body fluid (SBF), and electrochemical analyzer. The experimental results show that the bioactive rare earth gradient coating which has excellent chemical metallurgy bonding at the interface consists of substrate, alloying layer and bioceramic coating. Nd2O3 plays an important role in synthesizing HA and β-TCP during wide-band laser cladding. When the mass fraction of Nd2O3 is up to 0.6%, the amount of HA+β-TCP catalyzed during wide-band laser cladding becomes the largest. When the mass fraction of Nd2O3 is 0.4%-0.6%, the corrosion resistance of bioceramic coating is the best one, and the amount of HA deposited on coating becomes the biggest, showing the best bioactivity.
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