难熔金属碳化物覆层磨损率的统计分布

Distribution in Statistics of Wear Rate Data of Refractory Metal Carbide Coatings

采用销／盘磨损试验，测定碳化钒（ＶＣ）和碳化铌（ＮｂＣ）覆层的大量磨损数据．借助统计方法，得出碳化物覆层磨损系数Ｋ服从对数正态分布．估计了不同配副试样Ｋ的分布参数和位置统计量，作出了直方图和密度函数曲线，评价了销／盘磨损特性．结果表明：中位数比算术平均值能更好地描述实际平均磨损；随着载荷的增加，位置统计量趋于接近；碳化物覆层磨损抗力是淬火钢的６～１１倍．

A large number of wear data of VC and NbC coating were measured using the pin/disc wear test. The wear coefficient K of carbide coatings obeys the log normal distribution which was determined by statistical methods. The parameters of distribution and the place statistics of K of specimens in various pairs were evaluated. The histograms and curves of the density function were plotted. The evaluation of wear properties of pin/disc was performed. The results indicate that the median discribes realities of mean wear better than arithmetic mean value. The place statistics tend to a close value with increasing load. The wear resistance of carbide coatings was 6～11 times as large as that of quenched steels.