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

为提高涂层的致密性和镀层的粘结性，开发了喷涂涂层的电解加热工艺。研究了电弧加热条件对镀层形成的影响，并通过硬度试验、磨粒磨损试验和腐蚀试验考察了镀层的性能。电弧加热镍基自熔合金涂层的维氏硬度为hv650 ~ 700，等于或高于火焰熔喷涂层。与低碳钢和不锈钢相比，电弧加热镍基自熔合金涂层表现出优异的耐磨性和耐腐蚀性。研究了镍基自熔合金涂层电弧焊接铜碳钢的显微组织和结合强度。铜/钢的接头强度在440 ~ 470 MPa之间。

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.