等离子喷涂Cr_3C_2-NiCr涂层的气孔率统计分析  

Statistical analysis of porosity variations in plasma sprayed Cr_3C_2-NiCr coatings

作　　者：李剑锋[1] 周霞明[1] 丁传贤[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《航空材料学报》2000年第1期33-39,共7页Journal of Aeronautical Materials

摘　　要：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。Statistical analysis of porosity variations in plasma sprayed Cr 3C 2 NiCr coatings was carried out and effects of gun translation speed and coating thickness on porosity of the coatings were investigated.It was found that the porosity variations in all the coatings,which were sprayed using different gun translation speeds and with different thickness,followed the Normal,Lognormal and Weibull distributions.Their variance coefficients were from 0.17 to 0.48,and Weibull moduli from 2.0 to 6.2.The confidence intervals of porosity means estimated basing on the three kinds of distributions were somewhat identical.The porosity values were statistically higher for coating samples with thickness less than 75μm and then decreased to a constant.Among the three kinds of gun translation speeds of 50,75 and 100m/min,the gun translation speed of 75m/min produced the coating with the lowest porosity.

关 键 词：等离子喷涂 CR3C2-NICR涂层 气孔率 航空 

分 类 号：V261.933[航空宇航科学与技术—航空宇航制造工程]