Improvement of Metal/Ceramic Composite Sprayed Coatiog by Electrolytic Arc Heating Method and Evaluation of the Coating Properties

为了提高涂层的致密性和结合力，开发了喷涂层的电解电弧加热工艺。研究了电弧加热条件对渗层形成的影响，并通过硬度测试、磨料磨损试验和腐蚀试验对渗层性能进行了测试。电解电弧加热的Ni基自熔性合金涂层的维氏硬度为HV 650 -700，等于或高于用火焰熔融喷涂涂层获得的维氏硬度。与低碳钢和不锈钢相比，电解电弧加热镍基自熔性合金涂层显示出优异的上级性能，包括耐磨性和耐腐蚀性。采用镍基自熔性合金涂层对铜与碳钢进行电弧电解焊接，研究了焊接接头的组织和结合强度。铜/钢的接头强度被测量为在440-470 MPa的范围内。

The electrolytic are heating process of the sprayed coating to improve the denseness and the bonding of the deposited coating has been developed. The effect of the electrolytic arc heating conditions on layer formation was investigated, and the coating properties were examined by hardness tests, abrasive wear test and corrosion tests. The Vickers hardness of the electrolytic arc heated Ni base self-fluxing alloy coatings was HV650-700, equal to or higher than that obtained with a flame fusing sprayed coating. The electrolytic arc heated Ni base self-fluxing alloy coatings displayed superior properties, including wear resistance and corrosion resistance, compared with mild steel and stainless steel. The microstructure and bond strength has been investigated for joint of a copper to carbon steel produced by electrolytic arc heat bonding with Ni base self-fluxing alloy coatings. Joint strength of copper/steel was measured to be in the range of 440-470 MPa.