离子镀TiCN和TiN工具涂层的微结构与切削性能

采用电弧离子镀技术在硬质合金铣刀和钻头上镀覆了TiCN和TiN涂层,研究并比较了两种涂层的微结构与力学性能,以及涂层铣刀的高速切削性能和涂层钻头的切削性能。结果表明,TiCN和TiN涂层同为单相的Na-Cl型结构,并都呈现(111)择优取向的柱状晶,TiCN涂层的硬度为34.6GPa,远高于TiN涂层25.1GPa的硬度。在高速铣削条件下,TiCN涂层铣刀的后刀面磨损速率仅为TiN涂层铣刀的约三分之一。TiCN涂层钻头在钻孔数为TiN涂层钻头两倍时的磨损量仍低于TiN涂层钻头。TiCN涂层的高硬度及在较高切削线速度下的减摩作用是这种涂层刀具寿命提高的重要原因。

Microstructure and Cutting Performance of TiCN and TiN Tooling Coatings Prepared by Ion Plating

TiCN and TiN coatings were deposited on the surface of milling cutter and cutter drill by arc ion plating method.Microstructure and mechanical properties of TiCN and TiN coatings,together with the high speed cutting performance of both coated drill and coated milling cutter were investigated in detailed.The results show that both TiCN and TiN coatings are NaCl-type structure,presenting as columnar crystals with（111）orientation.The hardness of TiCN coating is 34.6GPa,and it is much higher than that of TiN coating（25.1GPa）.Under the condition of high speed milling,the wear rate in the major flank of milling cutter coated with TiCN is only one third of that in cutter drill coated with TiN.The wear of milling cutter coated with TiCN is less than that of milling cutter coated with TiN,even when the number of drilling holes of drill coated with TiCN is twice as that of drill coated with TiN.The life of cutter and drill is greatly increased by deposition of TiCN coating due to its effect of high hardness and redecrease of friction coefficient during cutting process.