TiAlN,TiAlSiN涂层的制备及其切削性能

目的研究TiAlN及TiAlSiN涂层的微观结构及力学性能,以及硬质合金涂层刀具切削SUS304不锈钢的切削性能及磨损行为。方法采用阴极电弧离子镀技术在硬质合金试片及铣刀上分别制备纳微米TiAlN及TiAlSiN涂层。通过X射线荧光测量系统测量涂层的厚度,用扫描电镜(SEM)观察涂层表面形貌,用能谱仪(EDAX)分析涂层元素成分,用X射线衍射(XRD)分析涂层晶相结构,用纳米压痕仪表征涂层硬度,用洛氏硬度计定性测量涂层结合力,通过高速铣削试验探究涂层刀具的切削性能及磨损行为。结果 TiAlN及TiAlSiN涂层的厚度分别为3.32μm和3.35μm,表面致密、光滑,高分辨率(20 000×)下观察到涂层表面有液滴、针孔及凹坑存在。Si元素促进了Ti N(200)晶相的生长,晶粒尺寸减小,硬度增加。TiAlN及TiAlSiN涂层的显微硬度分别为29.6 GPa及37.7 GPa,结合力分别满足VDI-3198工业标准的HF3和HF1等级。在130 m/min的高速切削条件下,TiAlSiN涂层刀具寿命约为未涂层刀具的5倍,TiAlN涂层刀具的1.5倍。结论 Si掺杂制备的TiAlSiN涂层具有高的硬度及良好的抗粘附性,更适用于不锈钢材料的高速切削加工。

Preparation and Cutting Performance of TiAlN and TiAlSiN Coating

Objective In order to study the microstructure and mechanical properties of TiAlN and TiAlSiN coatings, or the cutting performance and wear behavior of coating tools cutting SUS304 stainless steel. Methods In this paper, nano-micron TiAlN and TiAlSiN coatings were prepared by cathodic arc ion plating on the surface of cemented carbide sample and tools. The thickness of the coatings was measured by X-ray fluorescence measurement system, scanning electron microscopy (SEM) was used to observe the coatings surface morphology, energy dispersive spectroscopy (EDAX) was used to analyze the coating elements, nano indenter was adopted to measure the coating hardness, Rockwell Hardness Tester was implemented to investigate the adhesion strength, high speed milling experiment was used to study the cutting performance and wear behavior of coating tools. Results The thickness of TiAlN and TiAlSiN coating is 3.32um and 3.35um, the coating surface is dense and smooth. Droplets, pinholes and shallow craters are existent on coating surface with high resolution. The Si element promotes the growth of TiN (200) crystal phase, and the structure of the coating is good, the grain size decreases and the hardness increases. The micro-hardness of TiAlN and TiAlSiN coatings is 29.6GPa and 37.7GPa respectively. The adhesion strength meets the VDI-3198 industrial standard of HF3 and HF1. Under the high cutting speed of 130m/min, The tool life of TiAlSiN coating is about 5 times than that of uncoated tool, and 1.5 times than that of TiAlN coating tool. Conclusion TiAlSiN coating prepared by Si doping have high hardness and better resistance to adhesion, which is more suitable for high speed machining of stainless steel.