【作者】 熊海平；

【导师】 萧以德； 伍建华；

【作者基本信息】 机械科学研究院 ， 材料学， 2003， 硕士

【摘要】 火焰喷塑是一种环境污染极低的防腐和阻隔涂层制造技术，在航天航空、汽车、化工等行业有着极其广阔的应用前景。由于目前市场上大量使用的非极性聚乙烯的火焰喷塑涂层附着力较低，而一些附着力较高的涂层材料如：乙烯—甲基丙烯酸共聚物（EMAA）等需要进口，价格昂贵，因此，研究聚乙烯的改性方法和价格低廉的喷塑材料是本研究的主要目的。另外，研究改性聚乙烯火焰喷塑工艺条件以及喷塑涂层附着力测量时有效的粘结方法是本研究首先必须完成的任务。 采用掺混改性的方法，向聚乙烯火焰喷塑材料中加入带极性基团的物质可以增强聚乙烯涂层的极性，加入纳米材料可增强涂层的吸附能力，这两种方法可提高聚乙烯火焰喷塑涂层的附着力和多方面性能。本研究主要结论如下： （1）用拉开法测量火焰喷塑涂层附着力时，有效的粘接方法是采用加热粘结，并在粘结柱头表面预涂EMAA涂层，该方法能保证良好的测量效果和试验的可重复性。 （2）乙烯—甲基丙烯酸共聚物（EMAA）的加入增强了聚乙烯材料的极性，在很大程度上提高了PE涂层的附着力，并能提高PE涂层的力学性能、耐化学腐蚀性能、耐盐雾腐蚀及光老化性能。在PE中加入25％EMAA能使涂层的附着力提高60％，涂层抗冲击强度增加58.3％。 （3）加入纳米TiO₂、SiO_2-x能提高聚乙烯火焰喷塑涂层的附着力、抗冲击性能及涂层的耐老化性能。含纳米Al₂O₃的涂层具有极高的耐冲刷磨损能力。 （4）在聚乙烯火焰喷塑材料中按重量百分比加入25％EMAA可以制成一种性能优良价格相对低廉的火焰喷塑材料。更多还原

【Abstract】 Plastic flame spraying is one of the surface engineering techniques that have the slightest pollution of environment. The polymeric coatings are now widely used as the corrosion resistance, barrier coating in the fields of aircraft, automotive and chemical industry. Currently non-polar Polyethylene (PE) is the most popular materials in the market but the coating can not fit some special needs because its low adhesion. Other materials with high adhesion need to import from foreign countries at very high prices. Developing a modified PE method and a lower cost polymer used in the flame spraying are the objectives of this study. Improving the method of bonding stud with coating surface and studying the process conditions of PE flame spray are important tasks in this work.In this paper the modified PE methods are presented. To improve adhesion and other properties of PE spray coatings, it is expected that the coatings blending PE with the polar polymer brings polar group into the materials of flame spraying or dispersing the nanosized materials in PE matrix improves the absorbability of coatings. The main results of this study are summarized as follows.I To measure the adhesion of polymer coating to steel substrate by the direct pull-off technique, the most efficient way is heating the stud to 210癈 + 10 癈, use it fusion ethylene-methacrylic acid( EMAA) in it’s surface then bonding it to the coating surface. This method can warrant effective results as well as experiment repeatability.n The adhesion of PE flame spray coating is improved to a high level as well as the coatings properties such as mechanical property, corrosion-resistant property, salt spray test property and anti light-heat aging property by blending EMAA with PE. Blending25% EMM with PE according to weight percentage can enhance the adhesion of the PE coating by 60% and the impacting height by 58.3%.IJJ Dispersing nanosized TiO2, SiO2-x in PE matrix can improve the adhesion of the PE coating and the intensity of impacting . Nanocomposite coating has the powerful ability of anti light-heat aging. The AlO3 nanocomposite coating has excellent wear-resistance.IV A flame spraying PE material with lower cost and fine properties can be produced by blending 25% EMAA to PE according to weight percentage.Author: Xiong Haiping (Material Science) Directed by: Xiao Yide (Professor) Wu Jianhua (Professor)更多还原