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采用显微硬度法结合声发射技术，对在４５钢表面上用真空熔烧法制得的镍基合金——碳化钨复合涂层的脆性进行测估．结果表明：这种涂层的声发射能量累积计数值Ｅｎ与所加压入负荷Ｐ之间存在线性关系；可用Ｅｎ－Ｐ直线斜率Ｋ来评价涂层的脆性；不同碳化钨含量的涂层的Ｅｎ－Ｐ直线的斜率Ｋ不同；Ｋ值愈大，涂层的脆性愈大．
The microhardness method combined with acoustic emission technique was used to evaluate the brittleness of Ni-based alloy-tungsten carbide composite coating prepared by vacuum melting method on the surface of 45 steel. The results show that there is a linear relationship between the accumulated acoustic emission energy En of the coating and the pressure P applied. The En-P linear slope K can be used to evaluate the brittleness of coatings. The coatings with different tungsten carbide content The slope K of the En-P line is different; the larger the K value, the greater the brittleness of the coating.