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外送粉电弧喷涂复合涂层工艺与性能的研究
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摘要
电弧喷涂具有操作简单、成本低、涂层化学成分易调节等特点,因此,电弧喷涂的应用范围相当广泛。实心丝材的种类少、成分难以调节,应用范围也受到了限制;粉芯丝材受到金属外皮的限制,拉拔困难、成本高,成分调节困难等。
     由于实心丝材和粉芯丝材各有其自身的缺点,因此本文采用外送粉电弧喷涂,用实心丝材作为燃烧丝,配合外送的陶瓷粉进行喷涂,制备金属基陶瓷复合涂层。利用扫描电子显微镜(SEM)、能谱仪(EDAX)、X射线衍射仪(XRD)等测试方法对电弧喷涂涂层的显微组织结构、磨损表面进行了分析。其研究成果如下:
     采用SEM和EDAX分析了外送粉电弧喷涂涂层的微观结构和外送陶瓷粉的沉积情况。涂层的显微组织呈现典型的层状结构,组织致密并伴随少量的孔隙,在涂层中检测到了陶瓷粉的存在,说明陶瓷粉是可以进入到涂层当中的。
     工艺参数对涂层显微硬度的影响由主到次依次为:喷涂电流、喷涂距离、雾化空气压力、喷涂电压。涂层显微硬度的分布规律为:靠近基体材料,硬度为537HV,当距离为150 m时,达到最高为569HV,随着距离的增加硬度出现波动,越靠近涂层表面硬度越低。工艺参数对涂层结合强度的影响由主到次依次为:喷涂距离、雾化空气压力、喷涂电压、喷涂电流。涂层的磨损试验表明:在干摩擦磨损时,以犁沟磨损为主,并伴随着黏着磨损;油摩擦磨损时,以黏着磨损为主,并伴随着犁沟磨损。
Features of arc Spraying Technology are: simple operation, low cost, easy to adjust chemical composition of coatings, etc. Therefore, the arc spraying are wide range of applications. Types of solid wire less ingredients are difficult to regulate, the application scope has been limited; cored wire by metal skin of the restrictions, drawing difficulty, high cost, composition adjustment difficulties.
     As the solid wire and cored wires have their own drawbacks, so this paper carry outgoing arc spraying powder, using a solid wire as the burning of wire to meet the outgoing carry out spraying of ceramic powder to prepare metal matrix ceramic composite coatings. Using scanning electron microscopy (SEM), energy dispersive spectrometer (EDAX), X-ray diffraction (XRD) test methods, arc-sprayed coating microstructure on the organizational structure of the worn surface were analyzed. Results of their research are as follows:
     Using SEM and EDAX analysis outgoing arc spraying powder coating microstructure and outgoing deposition of ceramic powder. Microstructure of the coating showed a typical layered structure, organization, and dense with a small amount of pores in the coating detected the presence of ceramic powder, indicating ceramic powder into the coating can be among the.
     Of process parameters on micro-hardness of coatings from the primary to the meeting were: spray current, spraying distance, atomization air pressure, spray voltage. Coating micro-hardness distribution law as follows: near the substrate material, the hardness of 537HV, when the distance of 150 m, the highest for the 569HV, the increase in hardness with the distance fluctuations, the more close to the lower surface of the coating hardness. Of process parameters on the bonding strength of coating from the primary to the meeting were: spray distance, atomization air pressure, spray voltage, spray current. Coating wear tests showed: In the dry friction and wear, when to wear the main furrow, and accompanied by adhesive wear; oil when the friction and wear to adhesive wear of the main, and accompanied by plowing wear.
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