title: Effect of CeO2 and Y2O3 on microstructure, bioactivity and degradability of laser cladding CaO-SiO2 coating on titanium alloy.
abstract: To solve the lack of strength of bulk biomaterials for load-bearing applications and improve the bioactivity of titanium alloy (Ti-6Al-4V), CaO-SiO2 coatings on titanium alloy were fabricated by laser cladding technique. The effect of CeO2 and Y2O3 on 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 CeO2 or Y2O3 refines 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), SiO2 and TiO2. Y2O3 inhibits 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 CeO2 or Y2O3 present a lower weight loss, indicating the addition of CeO2 or Y2O3 improves the degradability of laser cladding sample.
authors: Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, People's Republic of China. Electronic address: lihuancai1988@sina.com.
authors: H C
authors: HC
authors: Li
authors: Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, People's Republic of China. Electronic address: wangdg@sdu.edu.cn.
authors: D G
authors: DG
authors: Wang
authors: Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, People's Republic of China. Electronic address: czchen@sdu.edu.cn.
authors: C Z
authors: CZ
authors: Chen
authors: Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji'nan 250061, Shandong, People's Republic of China. Electronic address: wengfeisdu@126.com.
authors: F
authors: F
authors: Weng
mesh_terms: D000497:Alloys / Q000494:pharmacology; D001826:Body Fluids / Q000187:drug effects; D017610:Calcium Compounds / Q000494:pharmacology*; D002516:Ceramics / Q000494:pharmacology; D002563:Cerium / Q000494:pharmacology*; D020099:Coated Materials, Biocompatible / Q000494:pharmacology*; D007834:Lasers; D008970:Molecular Weight; D010087:Oxides / Q000494:pharmacology*; D012822:Silicon Dioxide / Q000494:pharmacology*; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D014025:Titanium / Q000494:pharmacology*; D014961:X-Ray Diffraction; D015019:Yttrium / Q000494:pharmacology*
chemical_list: D000497:Alloys; D017610:Calcium Compounds; D020099:Coated Materials, Biocompatible; D010087:Oxides; C031462:titanium alloy (TiAl6V4); D002563:Cerium; D015019:Yttrium; C030583:ceric oxide; D012822:Silicon Dioxide; C016538:lime; D014025:Titanium; C091417:yttria
keywords: Bioactivity; Ceramic coating; Degradability; Laser cladding; Microstructure; Rare earth oxide