火炮驻退机节制环耐磨涂层的制备与性能研究

Preparation and properties of wear-resistant coatings on throttling ring of gun recoil brake

冲蚀磨损是造成火炮驻退机节制环失效的主要原因。为提高节制环的耐磨能力和固有可靠性,采用微弧沉积涂层和激光熔覆工艺在节制环内径表面分别制备铜基合金与镍基合金涂层,利用金相显微镜和显微硬度计分析合金涂层的表面形貌、内部组织及显微硬度。结果表明:微弧沉积涂层平均厚度为80μm,厚薄不均,铜基和镍基合金涂层的显微硬度分别为560HV和630HV;激光熔覆涂层平均厚度为140μm,均匀致密,铜基和镍基合金涂层的显微硬度分别为440HV和460HV。根据合金涂层的组织形貌、涂层质量和显微硬度,初步选择微弧沉积铜基合金涂层和激光熔覆镍基合金涂层作为下一步研究的对象。

Erosion wear is the main reason for the failure of throttling ring in gun recoil brake. In order to improve the wear- corrosion resistance ability and the inherent reliability of throttling ring, the copper base and nickel base alloy coatings on the inner surface of throttling ring were prepared by micro arc deposition and laser cladding coating technologies. The surface morphology, microstrueture and mierohardness of alloy coatings were analyzed by metallographie microscope and Vicker microhardness tester. Results show that the average thickness of coatings prepared by micro arc depositon is 80 μm, and the thickness is uneven, the microhardness of the copper base and nickel base alloy coatings are 560HV and 630HV, respectively. The average thickness of coatings prepared by laser cladding coating technology is 140 μm, and the thickness is dense and uniform, the microhardness of the copper base and nickel base alloy coatings are 440HV and 460HV, respectively. According to the surface morphology, microstructure and microhardness of alloy coatings, copper base alloy coating prepared by micro are deposition and nickel base alloy coating prepared by laser cladding technology are chosen as the research objects of the next stage.