钛合金表面生物陶瓷覆层的制备

Preparation of Bioceramic Coating on Titanium Alloy

用CaHPO4·2H2O和CaCO3制备羟基磷灰石粉末,以钛合金Ti6A14V为基材,采用等离子喷涂在不同喷涂距离和喷涂功率下制备羟基磷灰石涂层。结果表明:(1)随着喷涂功率的提高,颗粒的熔化程度提高,涂层与基体的结合强度增强;但同时涂层中的分解程度增加,出现了Ca4(PO4)3等第二相和杂相;增大喷涂距离可使涂层非晶化增强。(2)添加稀土元素可改善涂层的组织结构和界面的结合状况,并且有利于获得细小的晶粒。

Hydoxyapatite powders were prepared by using CaHPO4·2H20 and CaCO3 reacting, and taking Ti6Al4V as substrate, hydoxyapatite coatings were prepared by atmospheric plasma spraying method under a variety of spray distances and spray powers. The experimental results indicate that： （1）With the increase of spray power, the melting degree of particles improves, and the bonding strength between coatings and substrate is further enhanced; but at the same time, the decomposition of coatings increases and the second phases or other phases such as β-TCP, Ca4（PO4）3 arises; the increase of spray distance can reduce the crystallization of coating. （2）Adding rare earth elements into coatings can improve the microstructure characteristics of the coatings and the interface bonding, and get more fine crystalline grains.