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工程科学与技术:2017,49(Z2):238-243
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APS/HVOF热喷涂WC基金属陶瓷涂层的微观组织与性能
(1.四川大学;2.自贡长城硬面材料有限公司)
Microstructure and properties of APS/HVOF thermal sprayed WC-based cermet coatings
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投稿时间:2016-09-02    修订日期:2017-03-29
中文摘要: WC基涂层由于具有较高的硬度、优异的耐磨性、较好的抗腐蚀性,广泛应用于石油等工业中提高零件的磨损和腐蚀性能。随着现代化工业中工件服役环境日趋复杂,对制备性能优异的WC基涂层要求越来越高。在热喷涂技术中,热喷涂大气等离子热喷涂(APS) 喷涂温度范围广,可以提高至数万温度,在喷涂难容材料方面具有无与伦比的优势,而超音速火焰喷涂(HVOF)由于具有较高的焰流速度,粒子动能较高,同时由于喷涂过程中N2等冷却喷涂材料,近来在涂层制备中具有广泛的应用。本文利用APS与HVOF两种热喷涂方法在45钢表面制备WC-10Co-4Cr、WC-17Co两种涂层,对不同方式制备的涂层截面硬度、金相组织、与基体结合能力、涂层脱碳情况进行分析。结果表明:HVOF 涂层在喷涂中粒子未充分熔化,但粒子动能较高,表面相比于APS喷涂方式更加平整,与基体的结合性能好于APS制备的涂层。通过HVOF制备的两种涂层的孔隙率均低于APS制备的涂层,其中HVOF 制备的WC-17Co具有最小的孔隙率(0.65%)。此外,HVOF涂层的硬度均高于APS制备的涂层,由于具有较少的粘结相,通过HVOF制备的WC-10Co-4Cr涂层具有最高的截面硬度。相比于HVOF,APS具有较高的喷涂温度和较低的焰流速度导致涂层在喷涂过程中氧化脱碳现象较为严重,出现大量的W2C及少量的Co3W3C、Co6W6C等脆性η相。因此,HVOF更适合于喷涂WC-10Co-4Cr、WC-17Co两种涂层。
中文关键词: APS  HVOF  WC-10Co-4Cr  WC-17Co  微观组织
Abstract:Due to high hardness, great wear resistance and good corrosion resistance, WC-based coatings are widely used in industry to increase the wear resistance and corrosion resistance of components. As the development of industry, the properties of WC-based coatings are demanding higher and higher. In thermal spraying processes, Atmospheric plasma spraying (APS) has unique advantages due to large range of temperature and highest tens of thousands of temperature, which can melt refractory materials. The high-velocity-oxy-fuel (HVOF) is widely used in thermal spraying with its high velocity of flame and kinetic energy of powders. With the cooling by N2 during spraying, the coatings sprayed by HVOF show better property. This paper focused on the microstructure and properties of WC-10Co-4Cr, WC-17Co coatings sprayed by HVOF/APS on AISI 1045 steel. The hardness, metallographic structure, adhesion with substrates, decarburization during spraying of two coatings was investigated separately. The results showed that the powders of HVOF coatings melted incompletely and had high kinetic energy, resulting in more smooth coating. The adhesion with substrates of HVOF coatings was higher than APS coatings according to metallographic structure. Furthermore, porosity of all coatings sprayed by HVOF was much higher than APS sprayed coatings and the WC-17Co coating sprayed by HVOF had lowest porosity (0.65%). Besides, the hardness of coatings sprayed by HVOF was higher than APS sprayed coatings. Due to lowest binder content, the WC-10Co-4Cr sprayed by HVOF had highest hardness. From XRD, the coatings sprayed by HVOF had very slight decarburization with the existence of little W2C. However, the decarburization of APS sprayed coatings was more serious. There existed a large amount of W2C and little Co3W3C, Co6W6C (η phase) due to its higher temperature and lower velocity of flame during spraying. Accordingly, HVOF was more suitable to spray WC-10Co-4Cr, WC-17Co coatings.
keywords: APS  HVOF  WC-10Co-4Cr  WC-17Co  microstructure
文章编号:201600910     中图分类号:    文献标志码:
基金项目:省自然科学基金:请在下栏中列出明细(含项目号和具体课题名)
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李深厚,郭智兴,熊计,雷勇,李玉玺.APS/HVOF热喷涂WC基金属陶瓷涂层的微观组织与性能[J].工程科学与技术,2017,49(Z2):238-243.
lishenhou,guozhixing,xiongji,leiyong,liyuxi.Microstructure and properties of APS/HVOF thermal sprayed WC-based cermet coatings[J].Advanced Engineering Sciences,2017,49(Z2):238-243.