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研究了等离子喷涂Cr3C2 NiCr涂层的气孔率服从正态分布、对数正态分布和韦伯分布的拟合优度。在统计分析的基础上 ,考察了喷枪移动速率和涂层厚度对涂层气孔率的影响。结果表明 ,在不同喷枪移动速率下喷涂不同厚度涂层 ,其气孔率均同时显著地服从正态分布、对数正态分布和韦伯分布 ,它们的变异系数在 0 .17～ 0 . 4 8,韦伯模数在 2 .0～ 6 . 2 ;根据不同分布估计出的平均值的置信区间基本相同。在相同的喷涂工艺参数条件下 ,厚度小于10 0 μm的涂层的气孔率较高 ;当涂层的厚度较厚时 ,涂层的气孔率为一常数。在 50 ,75和10 0m/min三种喷枪移动速率中 ,以 75m/min喷枪移动速率喷涂涂层的气孔率最低。
The porosity of plasma-sprayed Cr3C2 NiCr coating was studied as a normalized distribution, a logarithmic normal distribution and a Webster distribution. Based on the statistical analysis, the effect of gun moving velocity and coating thickness on the porosity of the coating was investigated. The results show that at different spray gun movement rates sprayed with different thickness of the coating, the porosity at the same time significantly obeys the normal distribution, lognormal distribution and Weber distribution, their coefficient of variation of 0.17 ~ 0.48, The Weber modulus is between 2.0 and 6.2. The confidence intervals of the mean estimated from different distributions are basically the same. Under the same spray process parameters, the porosity of the coating less than 100 μm was higher; when the thickness of the coating was thick, the porosity of the coating was constant. Among the three gun moving rates of 50, 75 and 10 0 m / min, the coating was sprayed at 75 m / min with the lowest porosity.