Characterization and mechanical behaviour of reinforced hydroxyapatite coatings deposited by vacuum plasma spray on SS-316L alloy
Characterization and mechanical behaviour of reinforced hydroxyapatite coatings deposited by vacuum plasma spray on SS-316L alloy
复制标题
DOI：
10.1016/j.jmbbm.2018.01.005
复制
发表时间：
2018-03-01
影响因子：
3.9
通讯作者：
Chawla, Vikas
中科院分区：
文献类型：
--
作者：
Singh, Amardeep;Singh, Gurbhinder;Chawla, Vikas
采用真空等离子喷涂(VPS)技术，在SS-316L基材上分别添加10wt%(wt%)的Al_2O_3和10wt%的ZrO_2(HA+10wt%的Al_2O_3和10wt%的ZrO_2)增强羟基磷灰石粉末。将所得涂层在700℃下热处理1h，研究其对涂层组织和力学性能的影响。用扫描电子显微镜、X射线衍射仪、孔隙率、表面粗糙度和结晶度等方法对涂层进行了表征。结果表明，涂层后热处理后，孔隙率显著降低，结晶度显著提高。此外，涂层的横截面硬度和结合强度显著提高，但由于未熔化和部分熔化的颗粒在热处理过程中发生扩散，导致顶层硬度降低。
Hydroxyapatite powder reinforced individually with 10 wt percentage (wt%) of Al2O3 and ZrO2 (HA + 10 wt% Al2O3 and HA + 10 wt% ZrO2) was thermally sprayed onto SS-316L substrate with a bond coat of Zirconia by vacuum plasma spray (VPS) technique. The resulted coatings were heat treated at 700 degrees C for 1 h to study its effects on microstructural and mechanical properties of the deposited coatings. The characterization of the coatings was carried out using scanning electron microscope, x-ray diffraction, porosity, surface roughness and crystallinity using Rietveld analysis. The results indicated that after post coating heat treatment substantial decrease in porosity was witnessed along with significant improvement in crystallinity. Besides, the hardness across the cross-section of the coatings and bond strength was considerably improved; however the hardness of top coat was reduced owing to the loosening of un-melted and partially melted particles by diffusion process which takes place during heat treatment.