镍基合金——碳化钨复合涂层脆性的测估

Brittleness Measurement of Ni Based Alloy Tungsten Carbide Composite Coating

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．

In this paper the mirohardness method with the AE (acoustic emission) technology is used to measure the brittleness of Ni Based tungsten carbide composite coating made by the vacuum fusion sintering method on the surface of 45 steel. The results show that there is a linear realation between the values of AE energy ( En ) and the values of load ( P ), the slope ( K ) of En P lines are different in the coatings with different content of tungsten carbide; the slope ( K ) presents the brittleness of coating; the larger the value of K is, the higher the value of the brittleness of the coating is.