摘要
利用超音速等离子喷涂技术制备了不同喷涂功率条件下的NiCr-Cr_3C_2涂层,结合表面自由能理论研究了其表面摩擦学性能。利用Owens-Wendt几何平均法计算了涂层的表面自由能及其分量。对比发现,涂层孔隙率、显微硬度和摩擦因数均随着喷涂功率的变化而变化,且其变化趋势与极性分量均表现出一定的相似性。分析表明,受喷涂功率的影响,喷涂粒子的温度和速度对涂层表面分子间作用力产生影响,从而间接改变了涂层表面的自由能,并且自由能及其分量的改变,会直接影响NiCr-Cr_3C_2涂层表面的摩擦学特性。
The NiCr-Cr3C2 coatings are prepared by the supersonic plasma spraying under different spraying powers and the tribological properties are studied with surface free energy theory. By measuring the contact angles of the coating, the surface free energy and its components are calculated by the Owens-Wendt geometric mean method. By comparing the analysis, it finds that the porosity, micro-hardness and friction coefficient of the coating change as the spraying power, and the trend shows a certain similarity with the polar component. The analysis result indicates that the intermolecular force of surface is affected by the temperature and velocity of the flying particles under different spraying power. That indirectly changes the surface free energy and its components. When the change happened, the tribological properties of NiCr-Cr3C2 coating will be affected directly.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2015年第23期96-102,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金(51275151)
国家重点基础研究发展计划(973计划
2011CB013405)
国家杰出青年科学基金(51125023)资助项目
