标题：Effect of CeO2and Y2O3on microstructure, bioactivity and degradability of laser cladding CaO-SiO2coating on titanium alloy
作者：Li, H.C. ;Wang, D.G. ;Chen, C.Z. ;Weng, F.
作者机构：[Li, H.C. ;Wang, D.G. ;Chen, C.Z. ;Weng, F. ] Key Laboratory for Liquid-Solid Structural Evolution and oProcessing of Materials, Ministry of Education 更多
来源：Colloids and Surfaces B: Biointerfaces
摘要：To solve the lack of strength of bulk biomaterials for load-bearing applications and improve the bioactivity of titanium alloy (Ti-6Al-4V), CaO-SiO2coatings on titanium alloy were fabricated by laser cladding technique. The effect of CeO2and Y2O3on microstructure and properties of laser cladding coating was analyzed. The cross-section microstructure of ceramic layer from top to bottom gradually changes from cellular-dendrite structure to compact cellular crystal. The addition of CeO2or Y2O3refines the microstructure of the ceramic layer in the upper and middle regions. The refining effect on the grain is related to the kinds of additives and their content. The coating is mainly composed of CaTiO3, CaO, α-Ca2(SiO4), SiO2and TiO2. Y2O3inhibits the formation of CaO. After soaking in simulated body fluid (SBF), the calcium phosphate layer is formed on the coating surface, indicating the coating has bioactivity. After soaking in Tris-HCl solution, the samples doped with CeO2or Y2O3present a lower weight loss, indicating the addition of CeO2or Y2O3improves the degradability of laser cladding sample.
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