稀土氧化物添加量对激光熔覆磷酸钙陶瓷涂层组织性能的影响

发布时间：2017-12-27 05:10

  本文关键词：稀土氧化物添加量对激光熔覆磷酸钙陶瓷涂层组织性能的影响　出处：《稀有金属》2016年05期 　论文类型：期刊论文

  更多相关文章： 稀土氧化物 激光熔覆 磷酸钙陶瓷 涂层

【摘要】：β-磷酸三钙(β-TCP)和羟基磷灰石(HA)被视为优良的生物活性材料。本文利用激光熔覆技术在钛合金(Ti6Al4V)表面制备一层含β-TCP和HA的稀土氧化物掺杂磷酸钙陶瓷涂层,通过光学显微镜(OM),X射线衍射(XRD),扫描电镜(SEM)和显微硬度计分别对陶瓷涂层的结合界面、物相、表面形貌及显微硬度进行分析。试验结果表明:基材与陶瓷层呈冶金结合,熔覆试样可分为基材、热影响区、合金化区及陶瓷熔覆层4个区域;当La2O3添加量为0.6%(质量分数)时,涂层主要含CaTiO_3,Ti O,β-TCP和HA等物相;通过扫描电镜观察涂层表面形貌,发现稀土氧化物La_2O_3的含量对涂层裂纹敏感性有较大影响,当稀土氧化物La_2O_3添加量为0.6%时,涂层表面较为平整,存在少量孔洞及裂纹,此时涂层硬度最大,达到HV 1971。
[Abstract]:Beta tricalcium phosphate (beta -TCP) and hydroxyapatite (HA) are considered as excellent bioactive materials. The use of laser cladding technology in titanium alloy (Ti6Al4V) layer containing beta -TCP and HA rare earth oxide doped calcium phosphate ceramic coating surface prepared by optical microscopy (OM), X ray diffraction (XRD), scanning electron microscopy (SEM) and micro hardness tester respectively on ceramic coating interface and phase the surface morphology, and hardness analysis. The test results show that the substrate and the ceramic layer is metallurgical bonding, cladding samples can be divided into the alloying zone and ceramic cladding material, the heat affected zone, 4 regions; when the amount of La2O3 is 0.6% (mass fraction), the coating mainly containing CaTiO_3, Ti O, beta -TCP and HA phase; the surface morphology of the coating was observed by scanning electron microscope, found the content of rare earth oxides La_2O_3 have great influence on the coating crack sensitivity, when the rare earth oxide content of La_2O_3 was 0.6%, the coating surface is smooth, there exists a small hole and crack, the maximum hardness of the coating reached HV, 1971.
【作者单位】： 贵州大学材料与冶金学院;贵州省材料结构与强度重点实验室;
【基金】：国家自然科学基金项目(51362004)资助
【分类号】：TG178
【正文快照】： β-磷酸三钙的化学式为β-Ca3(PO4)2,简称β-TCP,因与人体骨骼无机成分相似,易生物降解吸收、无毒副作用等性能,一直受到学者们密切关注,被视为优良的生物活性降解材料[1-3]。羟基磷灰石化学式为Ca10(PO4)6(OH)2,简称HA,又称羟基磷酸钙,是目前研究较多的一种生物活性材料[4-7]，

本文编号：1340365