丙烷压力对超声速微粒沉积铝青铜涂层组织和性能的影响

采用超声速微粒沉积技术在不同丙烷压力(0.469 MPa,0.496 MPa,0.524 MPa,0.551 MPa)条件下制备4种铝青铜涂层,采用环境扫描电子显微镜、X射线衍射仪、能谱仪等试验仪器表征涂层的微观组织、相结构以及氧元素质量分数等,运用显微硬度仪、拉伸试验机和CETR摩擦磨损试验机等试验设备分析涂层的力学性能和摩擦学性能。结果表明,丙烷压力对涂层组织结构及力学性能有显著的影响,随着丙烷压力的升高,涂层孔隙率与氧元素质量分数呈负相关关系,在丙烷压力为0.524 MPa时,涂层孔隙率为0.8%,氧元素质量分数为0.97%,更接近其平衡点;丙烷压力为0.524 MPa以下时,涂层较原始粉末物相无明显变化,主要仍为α+β'+K相;涂层显微硬度、结合强度及耐磨性能随丙烷压力的升高均呈先增大后减小的趋势变化,丙烷压力为0.524 MPa时,涂层的力学性能和耐磨性能达到最优。

Influence of Propane Pressure on Microstructure and Properties of Supersonic Particles Deposition Aluminum Bronze Coatings

Four kinds of aluminum bronze coatings are fabricated by supersonic particles deposition (SPD) method under different propane pressure (0.469 MPa, 0.496 MPa, 0.524 MPa, 0.551 MPa). The microstructure, phase structure and oxygen content of coating are analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). The mechanical properties are tested on a tensile testing machine and a hardness tester. The wear resistance properties are investigated by CETR wear tester. The results show that propane pressure has a significant effect on microstructure, mechanical properties and wear resistance properties. With the increase of propane pressure, porosity and oxygen content of coating are negatively correlated. The coating with propane pressure 0.524 MPa has relatively superior porosity (0.8%) and oxygen mass fraction (0.97%), which closes to balance between porosity and oxygen content. All the spray power and coatingsare composed of α, β' and K phase, when the propane pressure is lower 0.524 MPa. The average hardness, adhesive strength and wearing capacity of the coating shows a first increases and then decreases trend, with the increase of propane pressure. The mechanical properties and wear resistance properties of aluminum bronze coatings fabricated by SPD with propane pressure 0.524 MPa are optimal respectively.