Impact Resistance of CVD Multi-Coatings with Designed Layers

作者：Jiedong Deng, Feng Jiang, Xuming Zha, Tao Zhang, Hongfei Yao, Dongwei Zhu, Hongmei Zhu, Hong Xie, Fuzeng Wang, Xian Wu, Lan Yan · 发表于：Coatings · 年份：2023 · DOI：10.3390/coatings13050815 · 被引用次数：5 · 研究领域：Metal and Thin Film Mechanics、Metal Alloys Wear and Properties、Diamond and Carbon-based Materials Research

Coated cutting tools are widely used in the manufacturing industry due to their excellent properties of high heat resistance, high hardness, and low friction. However, the milling process is a dynamic process, so the coatings of milling tools suffer severe cyclic impact loads. Impact resistance is important for the life of milling tools. Multi-coatings with different layer thickness may influence their impact resistance, but few studies focus on this topic. In this study, CVD coating with a structure of TiN layer, Al2O3 layer, and TiCN layer was selected as the research objective. Four different CVD coatings with different layer thicknesses were designed and prepared. The impact resistance test method was proposed to simulate the impact due to cut-in during down the milling process. We obtained the load by setting an impact depth of 25/30/35 µm, recording the impact force during the impact process, and calculating the contact stress; it was found that, at the impact depth of 25/30/35 µm, the download loads were around 9/11/13 N, while the contact stresses were all around 1 GPa. The failure morphology of the coating surface was investigated after the impact process. By comparing the contact stress and the surface morphology of the designed coatings, the impact resistance of four kinds of designed CVD coatings were evaluated. Experiments have shown that an increase in coating thickness and total coating thickness reduces impact resistance by about 10%. The impact resistance of ...