OALib Journal期刊
Ni添加对TiB2/TiB钛基复合涂层组织与力学性能的影响
DOI: 10.11900/0412.1961.2014.00263
Keywords: 激光技术 ,激光熔覆 ,TC4钛合金 ,TiB ,TiB
Abstract:
以TiB2粉末和Ni+TiB2粉末混合物分别作为预置层,采用激光原位技术在钛合金表面制备出2类复合涂层.运用XRD,SEM,EPMA与硬度计等实验手段,对合成的复合涂层进行测试分析.结果表明,Ni添加之前,可获得TiB2颗粒与TiB短纤维增强钛基复合涂层,但涂层表面成型质量较差.Ni添加之后,既可改善涂层的表面成型质量,又可生成bcc结构的NiTi合金填充在TiB2颗粒与TiB短纤维周围.Ni的添加还可使TiB2颗粒得以细化,且涂层中出现了b-Ti基.Ni的添加使涂层的显微硬度值降低,但涂层的断裂韧性得以提高.钛基复合涂层主要通过颗粒脱粘与短纤维断裂偏移方式使裂纹发生偏转来提高涂层的断裂韧性.
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