摘要
以54.51Ti-37.68Ni-7.81B4C(元素前数字为质量分数值)粉末混合物为原料,利用激光熔覆技术在TA15钛合金基材表面制得了以外加未熔B4C颗粒及快速凝固"原位"生成硼化钛和碳化钛为增强相,以金属间化合物TiNi、Ti2Ni为基体的复合涂层。采用光学显微镜(OM)、X射线衍射(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)等手段分析了涂层显微组织,并测试了涂层的二体磨粒磨损性能。结果表明,激光熔覆硬质颗粒增强金属间化合物复合涂层硬度高、组织均匀并表现出优异的抗磨粒磨损性能。高硬度、高耐磨的B4C、硼化钛和碳化钛陶瓷增强相与高韧性TiNi/Ti2Ni金属间化合物基体的强韧结合是激光熔覆涂层优异耐磨性的主要原因,其磨损机理为轻微的显微切削和塑性变形。
A wear resistant hard particles reinforced intermetallic composite coating is fabricated on TA15 titanium alloy by the laser cladding process using 54.51Ti-37.68Ni-7.81B4C powder blends as the precursor materials.Microstructure and worn surface morphologies of the coating are characterized by optical microscopy（OM）,scan electron microscopy（SEM）,X-ray diffraction（XRD） and energy dispersive X-ray analysis（EDS）.Wear resistance of the coating is evaluated under abrasive wear condition.Results indicate the hard particles including additional B4C and in situ synthesized titanium boride and titanium carbide are uniformly distributed in the TiNi/Ti2Ni dual-phase intermetallic matrix.The coating has high hardness and exhibits excellent wear resistance.The mainly wear mechanism of laser clad coating is slight micro-cutting and plastic deformation.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2012年第2期60-65,共6页
Chinese Journal of Lasers
基金
国家973计划(2011CB606305)资助课题
