中文摘要：

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。

英文摘要：

Using a closed field unbalanced magnetron sputtering system,the cemented carbide end mills were coated with a CrTiAlN hard coating,which consisted of a Cr adhesive layer,a CrN interlayer and a CrTiAlN top layer.The microstructure and mechanical properties of the coating were investigated by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,micro indentation and scratch test.The cutting performance of the coated end mills were conducted by high-speed dry milling hardened steel（P20,HRC 45）.The results indicates that the coating is composed of（Cr,Ti,Al）N columnar grains with nanolayers.The coating exhibits good adhesion to cemented carbide substrate and high microhardness of around 30 GPa.The coated end mills show significant improvement on tool life and much lower cutting force as compared to the uncoated ones.And the related mechanisms were discussed.