Effect of Na2O and ZnO on the microstructure and properties of laser cladding derived CaO-SiO2 ceramic coatings on titanium alloys
| Autor: | H.C. Li, H.J. Yu, Jinhe Dou, Cheng Hu, Chuanzhong Chen, D.G. Wang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Titanium alloy 02 engineering and technology Substrate (electronics) engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Apatite 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Dendrite (crystal) Colloid and Surface Chemistry Coating visual_art visual_art.visual_art_medium engineering Ceramic Composite material 0210 nano-technology Layer (electronics) |
| Zdroj: | Journal of Colloid and Interface Science. 592:498-508 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2021.02.064 |
| Popis: | To improve the bioactivity of titanium alloy (Ti-6Al-4V), CaO-SiO2 coatings on titanium alloys were fabricated using laser cladding method. The effect of Na2O and ZnO on the microstructure and properties of the prepared coatings was discussed. The microstructure of the CaO-SiO2 coatings consists of cellular grains and cellular dendrites. The mutual diffusion of elements occurs between the coating and substrate. The base CaO-SiO2 coating is composed of different phases including CaTiO3, α-Ca2(SiO4), SiO2, TiO2 and CaO. The formation of CaTiO3 in the ceramic layer was analyzed through thermodynamics. Na2O has little influence on the microstructure, average hardness and wear resistance. When ZnO is added to the precursor, the microstructure turns to cell dendrite, and ZnO and Zn2SiO4 appear in the corresponding coating. The addition of ZnO reduces the average hardness and wear resistance of the ceramic layer. The in vitro soaking in SBF shows that the laser cladding coating has the ability to form an apatite layer. |
| Databáze: | OpenAIRE |
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