纺织钢领QPQ表面改性处理的耐磨性研究

1、摘 要 I 纺织钢领纺织钢领 QPQ 表面改性处理表面改性处理的耐磨性研究的耐磨性研究 作者简介：罗暹，女，1983 年 4 月生，师从成都理工大学李琼教授，2009年 6 月毕业于成都理工大学材料学专业，获得工学硕士学位。 摘摘 要要 QPQ(Quench Polish Quench)表面改性处理技术是指在 600以下将黑色金属零件放入两种性质不同的盐浴中，通过多种元素渗入金属表面，为了降低工件表面粗糙度，可对工件表面进行一次抛光，然后再在盐浴中作一次氧化，从而达到使零件表面改性的目的。它没有经过淬火，但达到了表面淬火的效果，因此国外称之为 QPQ。经QPQ 表面改性处理的试件，其表面形成一层铁氮化合物和致密的 Fe3O4氧化膜。 QPQ 表面处理技术适用于绝大部分低碳钢、 铸铁和粉末冶金件。 钢领是纺织机械中的一个非常重要的环状零件， 它与高速运转的钢丝圈组成一对摩擦副，是用量大、易磨损、频繁更换的零件。同时，钢领的性能直接关系到纺纱质量及产品成本，为降低和稳定纺纱张力，减少断头，减少成纱毛羽，提高纺纱质量，节约钢材、能源，降低成本，就必须提高钢领的硬度、耐磨性、光洁度和减少其变形

2、量，延长其使用寿命。 本文采用QPQ表面改性技术对纺织钢领（12CrAl钢）进行表面改性处理，探讨了在不同工艺参数条件下对纺织钢领耐磨性的影响。 运用金相显微镜观察渗层的断面组织；用扫描电子显微镜(SEM)观察渗层微观组织；试样硬度梯度分布用数显显微硬度计测量；用能谱仪测得渗层中的各元素分布及不同区域元素含量；采用台架试验对纺织钢领的耐磨性进行测试。 研究结果表明：在550保温2.5小时和570保温2小时的氮化条件下形成的化合物层深度分别为9m和14m。这两种情况下的硬度梯度较好，并获得较高的表面硬度。在四种渗氮工艺条件下，均渗入了一定量的C、N、 O元素，在570保温2小时的氮化条件下得到的氮元素分布在距表面010m的范围内保持较高的含量，在550保温2.5小时和5702小时的情况下渗氧效果较好，能提高渗层的耐腐蚀性。台架试验后，材质为12CrAl的纺织钢领比材质为20钢和20CrMo钢的纺织钢领的磨损量要小，并且材质为12CrAl钢的纺织钢领在550保温2.5小时的氮化条件下比在570保温2小时的磨损效果好。 关键词：QPQ 纺织钢领 渗氮 磨损 成都理工大学硕士学位论文 II R

3、esearch on the wear resistance for QPQ treated textile ring Introduction of the Author: Luo Xian, was born in April, 1983 whose tutor was Professor Li Qiong. She graduated from Chengdu University of Technology in Material Science major and was granted the Master Degree in June, 2009. Abstract QPQ（Quench Polish Quench）surface modification technology refers that ferrous metal were put into two types of the salt bath under 600 degrees, through a variety of elements were infiltrated into the metal s

4、urface so as to achieve the purpose of surface modification. In order to reduce the surface roughness， the specimen should be polished after nitriding, and then it should be oxidized in the oxidation furnace. It hasnt been quenched, but it can achieve the aim of surface quenching, so called QPQ abroad. The specimens were treated in a QPQ salt bath where the treated surface was composed of a composite layer and a tight Fe3O4 film. The QPQ process was suitable for most low-carbon steel, cast iron

5、and power-metallurgy components. The textile ring is a very important ringlike part of the textile machinery. At the same time, the capability of ring relate directly to the quality of spinning and the cost of the products. In order to reduce and stabilize spinning tension, reduce severs, improve spinning quality, save steel material and energy, reduce cost, we have to enhance the hardness, wear resistance, glossiness of the ring, and reduce the rings distortion, so that the rings life can be le

6、ngthened. In this thesis, the QPQ surface modification treatment was applied to the textile ring of steel 12CrAl.The influence of different process parameters on wear resistance for QPQ treated pieces were researched. The treated surface microstructure was observed by using SEM, meanwhile, the thickness and the quality of the compound layer were also analyzed. The microhardness of diffusion layers was measured by Digital Micro Hardness Tester. The infiltrated layer of the element distribution an

7、d element contents in different regions were measured by the energy spectrometer. The wear resistance of QPQ treated steel 12CrAl was investigated through bench scale test. The result indicated that: Steel 12CrAl was treated at a constant nitriding temperature of 550 for 2.5 hours and 570 for 2 hours, the depth of composite Abstract III layer was good, which is 9m and 14m respectively. QPQ treated layers of the 12CrAl steel consisted of carbon, nitrogen and oxygen elements. The optimal nitridng

8、condition is at 570 for 2 hours, it can obtain a optimal distribution of nitrogen and retain a higher content of nitrogen from the surface to the center in a range of 0 to 10m.And the better infiltration of oxygen can obtained at 550 for 2.5 hours and 570 for 2 hours, and it can advance ability of anti-corrupting. After bench test, the wear weight of 12CrAl textile ring after QPQ treated was less than 20 textile ring and 20CrMo textile ring. And the wear weight of 12CrAl textile ring, which was

9、treated at a nitrding temperature of 550 for 2.5 hours, was much less than the nitriding condition of 570 for 2 hours. Key words: QPQ textile ring nitriding wear 独创性声明 本人声明所呈交的学位论文是本人在导师指导下进行的研究工作及取得的研究成果。据我所知，除了文中特别加以标注和致谢的地方外，论文中不包含其他人已经发表或撰写过的研究成果， 也不包含为获得 成都理工大学 或其他教育机构的学位或证书而使用过的材料。 与我一同工作的同志对本研究所做的任何贡献均已在论文中作了明确的说明并表示谢意。 学位论文作者签名： 年 月 日 学位论文版权使用授权书 本学位论文作者完全了解 成都理工大学 有关保留、 使用学位论文的规定，有权保留并向国家有关部门或机构送交论文的复印件和磁盘， 允许论文被查阅和借阅。本人授权 成都理工大学 可以将学位论文的全部或部分内容编入有关数据库进行检索，可以采用影印、缩印或扫描等复制手段保存、汇编学位论文。 （保密的学位论文在解密后适用本授权书） 学位论文作者签名： 学位论文作者导师签名： 年 月 日 第 1 章 绪论 1 第第 1 章章 绪绪 论论 1.1 选题依据和研究意义选题依据和研究意义 钢领是纺织机械细纱机及捻线机上卷捻部分的一个非常重要的环状零件，它与高速运转的钢丝圈组成一对摩擦副，是用量大、易磨损、频繁更换的零件。钢领从结构上分，国内外主要有四大类：第一类是国内以 PG 命名的平面钢领；第二类是国内以 ZM 命名的锥面钢领；第三类是回转钢领；第四类是气隙导流钢领。其中，回转钢领是较为常见的一种1。钢领的质量对纺纱质量有着重要影响。钢领质量的好坏，考核的第一个技术经济指标就是对不断提高的锭速的适纺程度和断头率，第二个就是钢领寿命的长短2。如何提高钢领使用性能，延长其使用寿命，这对降低和稳定纺纱张力，减少断头，减少成纱毛羽，提高细纱产量质量，节约钢材、能源等都有重大的现实意义。 国际上，意大利、

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