原位自生(TiC+TiB)/Ti6Al4V复合材料摩擦磨损性能研究

Friction and Wear Performance of In-situ (TiC+TiB)/Ti6Al4V Composites

摘要:

本文用原位反应法制备了不同TiC和TiB增强相含量的(TiC+TiB)/Ti6Al4V复合材料(简记为TMC),用HT-1000型摩擦磨损试验机研究了外加载荷对原位本文用原位反应法制备了不同TiC和TiB增强相含量的（TiC+TiB）/Ti6Al4V复合材料（简记为TMC），用HT-1000型摩擦磨损试验机研究了外加载荷对原位（TiC+TiB）/Ti6Al4V复合材料干滑动摩擦磨损性能的影响，并利用扫描电镜及布鲁克三维形貌仪观察分析其磨损行为。结果显示，与Ti6Al4V基体相比，TiC+TiB增强相的生成提高了复合材料的耐磨性。对于含不同体积分数增强相的复合材料，随着外加载荷的增加，材料的磨损率和磨损深度增加，摩擦系数减小且在小范围内波动。在小负载下，磨损的表面覆盖有一些沟槽和少量磨屑;在大负载下，磨损的表面覆盖有一些浅沟槽和大量磨屑。磨损机制为磨粒磨损和氧化磨损。随着负荷增加，碎屑的尺寸增加，磨损加剧。

Abstract:

(TiC+TiB)/Ti6Al4V composites with different TiC and TiB contents were prepared by in situ synthesis. The influence of load on dry sliding friction and wear performance of in-situ (TiC+TiB)/Ti6Al4V composites (designated as TMC) was studied by HT-1000 friction and wear testing machine, and the wear behaviors of the composites were also investigated by scanning electron microscopy (SEM) and Bruker 3D profilometer. The results show that the wear resistance of TMC was improved by the formation of TiC and TiB phases compared with Ti6Al4V matrix. For the composites with different volume fraction reinforcing phases, the wear rate and wear depth were increased with the increasing of the applied load, and the friction coefficient decreased and fluctuated within a small range. At low loads, the worn surface was covered with grooves and a small amount of wear debris; under heavy loads, the worn surface was covered with narrow and shallow grooves and large amount of wear debris. Wear mechanisms were abrasive wear and oxidation wear. With the increasing of the load, the size of the debris was increased.