摘要
采用化学气相沉积的方法制备了3种不同涂层厚度的数控刀片样品,1#样品碳氮化钛MT-TiCN与Al2O3厚度分别为8μm与5μm,2#样品分别为10μm与6μm,3#样品分别为12μm与8μm。利用SEM、EDS和超景深显微镜表征了涂层的微结构和切削性能,并分别研究了3种不同厚度涂层在切削加工过程中的失效形式。结果表明,在高速车削加工铸铁时,1#样品的8次平均切削寿命为12 min,2#样品的平均切削寿命为16 min,3#样品的平均切削寿命为10 min,MT-TiCN与Al2O3厚度分别为10μm与6μm的2#样品显示切削性能最优,涂层厚度的适量增加有效的提升了样品的切削性能。其失效形式结果显示,1#、2#、3#样品开始出现粘结磨损的时间分别为6、10、4 min,粘结磨损后涂层开始逐渐失效。因此涂层厚度的适当增加有效的提高了其耐磨性能。
Three kinds of samples with different coating thicknesses were prepared by using chemical vapor deposition method. MT-TiCN and Al2O3 thicknesses for 1# samples are 8 μm and 5 μm, for 2# sample are 10 μm and 6 μm, for 3#sample are 12 μm and 8 μm, respectively. Microstructure and cutting performance of the coatings were characterized by SEM, EDS and optical microscopy. And the invalidation forms of the coatings were studied. The results show that in high speed turning of cast iron, 8 times average cutting life of 1# sample is 12 min, average cutting life of sample 2# is 16 min,average cutting life of 3# sample is 10 min. Cutting performance of 2# sample is optimal. The appropriate increase of coating thickness enhances the cutting performance of the sample effectively. The failure mode analysis results show that the occurance time of adhesive wear for 1# sample is 6 min, for 2# is 10 min, for 3# is 4 min. The coatings begin to fail gradually after adhesive wear. Therefore, the appropriate increase of the thickness of the coating can effectively improve its wear resistance.
出处
《硬质合金》
CAS
2015年第3期188-195,共8页
Cemented Carbides
基金
国家科技重大专项资助项目(2015ZX04005008)
