TiAlSiN复合涂层的制备及抗氧化机理研究
发布时间：2018-09-10 13:40
【摘要】：本课题通过阴极电弧离子镀方法在硬质合金基体表面制备TiAlSiN纳米复合涂层,同时沉积TiN、TiAlN两种纳微米薄膜进行对比。通过划痕法测量其膜基结合强度,并测量其厚度、硬度、摩擦系数等力学性能;在高温电阻炉内进行氧化实验,分析涂层的氧化变化及抗氧化机制,结合理论分析了 Al、Si含量的作用;同时利用现场切削实验,研究了三种涂层铣刀以及无涂层铣刀在铣削过程中的氧化磨损及失效,研究高速切削过程中高温对TiAlSiN纳米复合涂层的影响。主要有以下结论:(1)通过阴极电弧离子镀在YG-10硬质合金表面制备TiAlSiN复合涂层,涂层表面致密、均匀、光洁度好。通过与TiN、TiAlN涂层进行对比,TiAlSiN复合涂层的显微硬度最高,达到3800HV0.05,厚度适中为3.45μm,摩擦系数0.3,结合强度为42N (最大临界载荷值),达到工业应用标准HF-1级。(2) TiAlSiN 涂层经过 400℃、600℃、800℃、1000℃的高温退火,与 TiN、TiAlN纳微米薄膜进行对比。其中TiN最高抗氧化温度为600℃,表面形成大量白点有剥落现象,其生成TiO2氧化物不具备保护作用,涂层容易失效;TiAlN涂层的最高抗氧化温度在800℃,其失效形式与TiN涂层不同,其高温形成Al2O3氧化物致密,可以阻碍基体进一步被氧化,温度越高,表面裂纹加剧,涂层更多的是应力集中破坏;TiAlSiN的抗氧化性能最好,涂层氧化过程中氧化物颜色会有变化,形成了 Al2O3、SiO2、TiO2等多种氧化物,1000℃后基体严重变形,涂层脱落。(3)通过现场切削实验,从切削速度、磨损带宽及磨损率来评估其高速环境下的使用情况,TiAlSiN涂层切削最平稳,加工时间最长,TiAlSiN涂层的平均磨损值为0.1895,低于TiN、TiAlN涂层刀具。涂层中添加Al、Si,明显提高了刀具的耐磨特性、红硬性,减缓了刀体在高速切削过程的高温磨损。
[Abstract]:In this paper, TiAlSiN nanocomposite coatings were prepared on cemented carbide substrate by cathodic arc ion plating, and two TiN,TiAlN nanometer-thin films were deposited at the same time. The mechanical properties such as thickness, hardness and friction coefficient were measured by scratch method. Oxidation experiments were carried out in a high temperature resistance furnace to analyze the oxidation change and oxidation resistance mechanism of the coating. The function of Al,Si content is analyzed in combination with the theory, and the oxidation wear and failure of three kinds of coated milling cutters and uncoated milling cutters during milling are studied by field cutting experiments. The effect of high temperature on TiAlSiN nanocomposite coating during high speed cutting was studied. The main conclusions are as follows: (1) the YG-10 composite coating is prepared by cathodic arc ion plating on the surface of YG-10 cemented carbide. The coating surface is compact, uniform and smooth. The microhardness of TiAlSiN composite coating is the highest by comparing with TiN,TiAlN coating. It reaches 3800HV0.05, moderate thickness 3.45 渭 m, friction coefficient 0.3, bonding strength 42N (maximum critical load value), and reaches the standard HF-1 grade for industrial application. (2) TiAlSiN coating is annealed at 400 鈩，
本文编号：2234608
[Abstract]:In this paper, TiAlSiN nanocomposite coatings were prepared on cemented carbide substrate by cathodic arc ion plating, and two TiN,TiAlN nanometer-thin films were deposited at the same time. The mechanical properties such as thickness, hardness and friction coefficient were measured by scratch method. Oxidation experiments were carried out in a high temperature resistance furnace to analyze the oxidation change and oxidation resistance mechanism of the coating. The function of Al,Si content is analyzed in combination with the theory, and the oxidation wear and failure of three kinds of coated milling cutters and uncoated milling cutters during milling are studied by field cutting experiments. The effect of high temperature on TiAlSiN nanocomposite coating during high speed cutting was studied. The main conclusions are as follows: (1) the YG-10 composite coating is prepared by cathodic arc ion plating on the surface of YG-10 cemented carbide. The coating surface is compact, uniform and smooth. The microhardness of TiAlSiN composite coating is the highest by comparing with TiN,TiAlN coating. It reaches 3800HV0.05, moderate thickness 3.45 渭 m, friction coefficient 0.3, bonding strength 42N (maximum critical load value), and reaches the standard HF-1 grade for industrial application. (2) TiAlSiN coating is annealed at 400 鈩，
本文编号：2234608
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