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利用闭合场非平衡磁控溅射系统制备CrTiAlN复合涂层硬质合金立铣刀,该涂层由Cr粘接层、CrN过渡层以及CrTiAlN涂层组成。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电镜、显微硬度、划痕仪等技术对CrTiAlN涂层的显微组织和力学性能进行分析表征。在干式切削条件下,通过高速铣削测试淬硬钢(P20,HRC45)的切削性能。结果表明:涂层由有着纳米层Cr(Ti,Al)N结构的柱状晶组成。CrTiAlN涂层在硬质合金上具有良好的结合性能以及近30 GPa的高硬度。相对于无涂层铣刀,涂层大大提高硬质合金立铣刀寿命、减小切削力。讨论其相关切削机理。
CrTiAlN composite coated cemented carbide end mills were prepared by a closed field unbalanced magnetron sputtering system. The coating consisted of Cr adhesion layer, CrN transitional layer and CrTiAlN coating. The microstructure and mechanical properties of CrTiAlN coating were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy, microhardness and scratch tester. Cutting performance of hardened steel (P20, HRC45) is tested in high-speed milling under dry cutting conditions. The results show that the coating consists of columnar crystals with Cr (Ti, Al) N nanocrystalline structure. CrTiAlN coating has good bonding properties on cemented carbide and a high hardness of nearly 30 GPa. Compared with the uncoated cutter, the coating greatly enhances the life of carbide end mills, reducing the cutting force. Discuss its related cutting mechanism.