超音速火焰喷涂Cr_3C_2/NiCr、Stellite6、Inconel625、Inconel718涂层耐冲蚀性能研究
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摘要
采用超音速火焰喷涂技术,在15Cr_2Mo合金钢上制备了Cr_3C_2/NiCr、Stellite6、Inconel625、Inconel718涂层。测定了涂层的显微组织、结合力、显微硬度、孔隙率。研究了涂层耐固体颗粒冲蚀性能。结果表明,Cr_3C_2/NiCr涂层在结合力、显微硬度和孔隙率方面均优于其他涂层。同时,Cr_3C_2/NiCr耐固体颗粒冲刷性能最好,其冲蚀试验失重量仅为基体15Cr_2Mo的20%左右。Cr_3C_2/NiCr涂层显微组织中,高硬度的碳化物Cr_3C_2陶瓷相以多边形弥散分布在较软的基体NiCr合金相上。固体颗粒冲刷试验后,Cr_3C_2/NiCr涂层表面磨痕比较明显,但是没有发生明显的涂层分层剥落现象。优异的微观结构、细小的硬质颗粒以及较低的孔隙率等因素对涂层耐冲蚀性的显著提高起着关键作用。Cr_3C_2/NiCr涂层应用于冲蚀磨损环境,可有效提高部件寿命。
Cr_3C_2/NiCr, Stellite6, Inconel625 and Inconel718 coatings were applied to a 15Cr_2Mo steel substrate by means of high velocity oxygen fuel spraying(HVOF). The microstructures, adhesion strength, porosity, micro-hardness of the coatings were analyzed and erosion tests were conducted to study the erosion resistance of the four coatings. The results show that the Cr_3C_2/NiCr performs best in adhesion strengths, micro-hardness and porosity. Meanwhile the erosion resistance of Cr_3C_2/NiCr is best and its weight loss is only 20% of the weight loss of 15Cr_2Mo steel during the erosion test. The microstructure of crosssection morphology of Cr_3C_2/NiCr shows that the hard carbide Cr_3C_2 is distributed on the soft NiCr phase in the form of polygons. After the erosion test, there are obvious erosion marks, but the coating clearly did not peel off. The Cr_3C_2/NiCr coating shows good erosion resistance because it has an ideal microstructure, finer carbide hard particles, low porosity, etc..Applying the Cr_3C_2/NiCr coating in erosion environments greatly improves the service life.
Cr_3C_2/NiCr, Stellite6, Inconel625 and Inconel718 coatings were applied to a 15Cr_2Mo steel substrate by means of high velocity oxygen fuel spraying(HVOF). The microstructures, adhesion strength, porosity, micro-hardness of the coatings were analyzed and erosion tests were conducted to study the erosion resistance of the four coatings. The results show that the Cr_3C_2/NiCr performs best in adhesion strengths, micro-hardness and porosity. Meanwhile the erosion resistance of Cr_3C_2/NiCr is best and its weight loss is only 20% of the weight loss of 15Cr_2Mo steel during the erosion test. The microstructure of crosssection morphology of Cr_3C_2/NiCr shows that the hard carbide Cr_3C_2 is distributed on the soft NiCr phase in the form of polygons. After the erosion test, there are obvious erosion marks, but the coating clearly did not peel off. The Cr_3C_2/NiCr coating shows good erosion resistance because it has an ideal microstructure, finer carbide hard particles, low porosity, etc..Applying the Cr_3C_2/NiCr coating in erosion environments greatly improves the service life.
引文
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[7]王学军,葛丽玲,谭佳健.我国离心压缩机的发展历程及未来技术发展方向[J].风机技术,2015(3):65-77.
[8]虞明,朱柏安.组装式离心压缩机腐蚀积垢原因分析及处理措施[J].风机技术,2014(1):83-86,92.
[9]唐才宇,崔莲顺.防结垢、防腐蚀多层复合涂层的体系及性能研究[J].风机技术,2016(2):70-74.
[10]鲍君峰,于月光,刘海飞.HVOF喷涂WC/Co涂层冲蚀磨损机理研究[J].矿冶,2006,15(1):24-28.
[2]王海军,蔡江,韩志海.超音速等离子与HVOF喷涂WC-Co涂层的冲蚀磨损性能研究[J].材料工程,2005(4):50-54.
[3]潘继岗,樊自拴,孙冬柏,等.超音速火焰喷涂Fe基非晶合金涂层的性能研究[J].材料工程,2005(9):53-55.
[4]Murthy J K N,Venkataraman B.Abrasive wear behavior of WCCo Cr and Cr3C2-20(Ni Cr)deposited by HVOF and detonation spray processes[J].Surface&Coatings Technology,2006,200:2642-2652.
[5]LUGSCHEIDER E,REM ER P,H ERBEST C.Ni Cr-Cr C and Ni Cr-Ti C high w ear resistant coatings for protective applications in steam turbines[A].OHMARI A.Proceedings of ITSC95[C].Osaka,Japan:Japan High Temperature Society,1995:235-240.
[6]李振铎,于月光,刘海飞,等.高温耐磨损Cr3C2一25%Ni Cr涂层制备及其性能研究[J].有色金属(冶炼部分),2006(SO):37-40.
[7]王学军,葛丽玲,谭佳健.我国离心压缩机的发展历程及未来技术发展方向[J].风机技术,2015(3):65-77.
[8]虞明,朱柏安.组装式离心压缩机腐蚀积垢原因分析及处理措施[J].风机技术,2014(1):83-86,92.
[9]唐才宇,崔莲顺.防结垢、防腐蚀多层复合涂层的体系及性能研究[J].风机技术,2016(2):70-74.
[10]鲍君峰,于月光,刘海飞.HVOF喷涂WC/Co涂层冲蚀磨损机理研究[J].矿冶,2006,15(1):24-28.