How La2O3 Content Effects the Chemical, Mechanical and Physical Properties, and Biological Function of a Calcium Phosphate Bioceramic Coating Produced by Laser Cladding

摘要

A calcium phosphate bioceramic coating with beta-Ca-3(PO4)(2) (beta-TCP) and hydroxyapatite (HA) on a titanium alloy was prepared by means of the laser cladding technique using a CO, laser. The surface morphology, microstructure and microhardness were analysed. The experimental results indicate that this kind of gradient coating is comprised of bioceramic coating, alloying layer and heat affected zone (IIAZ) as well as the substrate. There is an excellent metallurgical bonding among layers. The phases of coating mainly contains CaTiO3, TiO2, beta-TCP and HA. The bioactivity of calcium phosphate bioceramic coating is directly related to the amount of synthesizing HA and beta-TCP. The rare earth oxide La2O3 can affect the formation of beta-TCP and HA. Also, the rare earth oxide La2O3 has great influence on crack susceptibility of the coating. The surface of coating is smooth and the quality is Unproved by adding La2O3. The bioceramic coating was immersed in SBF to examine its bioactivity for two weeks. The surface of the bioceramic with La2O3 has formed a large amount of bone-like apatite.