金属针布表面CrN涂层和渗Cr层的制备及其摩擦磨损性能研究

发布时间：2018-04-11 05:38

  本文选题：金属针布 + 多弧离子镀　； 参考：《南京航空航天大学》2017年硕士论文

【摘要】：纺织业在国民经济中占据重要地位,梳理是纺织生产的重要工序,梳棉机是实现梳理作业的主要设备,针布是梳棉机实现梳理功能的主要器材,但是国产金属针布耐磨度和锋利度持久性不够,导致金属针布使用寿命普遍偏短。针对以上问题,本文提出在纺织用金属针布表面制备具有良好的耐磨性能的表面改性层。本课题分别采用多弧离子镀技术在金属针布表面制备CrN涂层和双层辉光等离子表面冶金技术在金属针布表面制备渗Cr层,并研究两种合金层各自的力学性能和耐磨性能。通过研究各工艺参数的影响确定了金属针布表面弧等离子镀CrN试验的最优工艺参数为:极间距250mm,偏压200v,弧电流65A,镀膜温度220℃,镀膜时间90min,氮气压0.5Pa。制得的CrN涂层厚5.0μm;双辉等离子合金化技术制备金属针布渗Cr合金层,工艺参数为:源极电压900~960V,源极电流1.7A,阴极电压450~480V,阴极电流1.1A,极间距20mm,气压为35Pa,保温时间3小时,制得渗Cr层厚度约7μm。镀CrN层试样表面显微维氏硬度平均值约为基体试样显微维氏硬度的3.2倍,纳米硬度值约为3.3倍,渗Cr试样表面显微维氏硬度平均值约为基体试样显微维氏硬度的1.55倍,纳米硬度值约为1.85倍。基体的弹性模量约为161GPa,镀CrN涂层试样的弹性模量高达582GPa,而渗Cr试样的弹性模量约为118GPa,比基体的弹性模量略小。划痕实验显示,金属针布表面CrN涂层的结合力约为64N,渗Cr层的结合力约为61N。不同载荷、不同滑动速度,金属针布基体试样的平均摩擦系数最高,金属针布镀CrN试样的平均摩擦系数最低,金属针布渗Cr试样的平均摩擦系数相比基体有所降低,但幅度不高。金属针布基体试样的磨损体积最高,渗Cr试样的磨损体积小于基体,镀CrN试样的磨损体积最小,仅为基体磨损体积的0.1%左右。金属针布基体试样的磨损机理以磨粒磨损和粘着磨损为主,金属针布渗Cr试样的磨损机理以磨粒磨损和氧化磨损共同作用为主,金属镀CrN试样的磨损机理以轻微的磨粒磨损和剥层磨损为主。
[Abstract]:Textile industry occupies an important position in the national economy, carding is an important process in textile production, carding machine is the main equipment for carding operation, and needle-cloth is the main equipment for carding machine to realize carding function.However, the wear resistance and sharpness of domestic metal clothing are not durable enough, which leads to the short service life of metal clothing.In order to solve the above problems, a surface modified layer with good wear resistance is proposed on the surface of metal needlework for textile.In this paper, CrN coating and double glow plasma surface metallurgy were prepared on the surface of metal needlecloth by multi-arc ion plating, respectively. The mechanical properties and wear resistance of the two kinds of alloy layers were studied.By studying the influence of various process parameters, the optimum parameters for CrN test of metal needlecloth surface arc plasma plating are determined as follows: electrode spacing 250mm, bias voltage 200v, arc current 65A, coating temperature 220 鈩，

本文编号：1734680