摘要
应用光学显微镜(OM)、X射线衍射仪(XRD)、带能谱仪(EDS)的扫描电子显微镜(SEM)、显微硬度计及滑动磨损实验机等手段研究了15%(质量分数)VC对等离子转移弧(PTA)堆焊锡青铜涂层组织结构和耐磨性能的影响,并采用X射线衍射的Rietveld精修方法研究了添加VC前后锡青铜涂层中各组成相的结构参数与相对含量。结果表明,PTA堆焊锡青铜涂层主要由α(Cu,Sn),Cu_(10)Sn_3以及通过Cu-Fe(Fe元素由堆焊基材的冲淡引入)亚稳液相分离所形成的α(Fe)(Fe-rich)等物相构成,具有典型亚稳液相分离特征。球形Fe-rich分离相的相对含量约为8.7%,平均尺寸为约28.20μm。15%VC的加入形成了Cu-Fe-V亚稳液相分离组织,α(Fe,V)((Fe,V)-rich)分离相呈球形和偏聚体的状态分布在富Cu基体组织上,相对含量约为12.2%。球形(Fe,V)-rich分离相的平均尺寸约4.50μm。此外,添加VC的锡青铜复合涂层中还存在VC,V_2C和SnO_2等物相。15%VC的加入提高了锡青铜涂层的硬度和耐磨性能,磨损体积仅为锡青铜涂层的约56%。
Influence of 15 % VC addition on microstructure and wear resistance of a tin-bronze （VC-free） coating deposited by plasma transferred arc （PTA） surfacing was investigated by optical microscopy （OM） , X-ray diffractometer （XRD） , scanning electron microscopy （SEM） with energy dispersive spectroscopy （EDS） attachment, microhardness tester, and sliding wear tester. More detailed information about the structure parameters and the relative contents of phases in the tin-bronze coating before and after VC addition was studied using XRD Rietveld refinement method. The results showed that the VC-free coating consisted of α（ Cu, Sn）, Cu10Sn3 , and α （Fe） （Fe-rich） that was the product of the Cu-Fe liquid phase separation （Fe was introduced by dilution from surfacing substrate） , having a characteristic of metastable liquid phase separation. The relative content of the spherical Fe-rich separated phase in the VC- free coaitng was about 8.7% and its averaged size was about 28.20μ m. Adding 15% VC （VC-added） promoted forming Cu-Fe-V metastable liquid phase separation mierostructure. The （Fe, V）-rich separated phase whose relatvie content was about 12.2% in the VC-addeed coating distributed on the Cu-rich matrix by spheroid and segregation. The averaged size of the （Fe,V）-rich spheroid was about 4. 5 μm. Besides, VC, V2C, and SnO2 could also be found in the VC-added coating. Adding 15% VC increased the hardness and wear resistance of the VC-free coating. The wear volume of the VC-added coating was only 56% of that of the VC-free coating.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2017年第1期45-51,共7页
Chinese Journal of Rare Metals
基金
安徽省自然科学基金项目(1508085ME95)
中国博士后科学基金项目(2014M551796)
中央高校基本科研业务费专项资金资助
