激光等离子复合热源喷涂工艺沉积机理研究
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摘要
目的提高涂层的结合强度和改善微观组织结构。方法选取WC-10Co4Cr喷涂材料,分别通过激光等离子复合热源喷涂工艺以及等离子喷涂工艺制备涂层,对涂层组织与基本性能进行检测,对两种不同喷涂工艺的沉积机理作对比分析研究。研究复合热源喷涂涂层微观组织结构以及涂层与基体间结合方式较等离子喷涂涂层的变化。利用高速摄像仪对激光等离子复合热源喷涂以及等离子喷涂的工艺过程进行跟踪监测和分析,研究复合热源沉积过程中,基体表面微熔池的形成及粉末粒子在不同沉积工艺过程中熔融状态的对比,分析等离子喷涂涂层和复合热源喷涂涂层的沉积机理。结果等离子喷涂WC-10Co4Cr涂层以机械结合方式为主,涂层结合强度为39.5 MPa,孔隙率为1.7%,而激光等离子复合热源喷涂WC-10Co4Cr涂层实现了冶金结合,其结合强度提升到91 MPa,孔隙率降低到0.86%。结论激光等离子复合热源喷涂工艺可以有效提升涂层的结合力,改善涂层组织致密性,更有利于涂层的耐磨耐腐蚀性能。
The work aims to improve coatings' bonding strength and modify the microstructure. The laser hybrid plasma spraying(LHPS) technology and air plasma spraying(APS) technology were utilized to deposit the coating by WC-10 Co4 Cr spraying materials. The coatings' microstructure and basic performances were tested to analyze the deposition mechanism of the two spraying methods. The differences of microstructures and bonding methods to substrate of coatings by LHPS were mainly studied. The spraying procedures of LHPS and APS were traced and analyzed by the high speed camera. The differences of forming microwave on the substrate surface and the melting statement about the spraying particles during the depositing process were studied and compared. The deposition mechanism of LHPS and APS technologies was compared and analyzed. The APS WC-10 Co4 Cr coating's main deposition mechanism was mechanical bonding method, with bonding strength of 39.5 MPa and the porosity of 1.7%. However, the LHPS WC-10 Co4 Cr coating achieved metallurgical bonding method, with improved bonding strength of 91 MPa and the decreased porosity of 0.86%. Laser hybrid plasma spraying can improve the coating's bonding strength and porosity, which will be beneficial to improving the coating's wear-resistant and corrosion-resistant performances.
The work aims to improve coatings' bonding strength and modify the microstructure. The laser hybrid plasma spraying(LHPS) technology and air plasma spraying(APS) technology were utilized to deposit the coating by WC-10 Co4 Cr spraying materials. The coatings' microstructure and basic performances were tested to analyze the deposition mechanism of the two spraying methods. The differences of microstructures and bonding methods to substrate of coatings by LHPS were mainly studied. The spraying procedures of LHPS and APS were traced and analyzed by the high speed camera. The differences of forming microwave on the substrate surface and the melting statement about the spraying particles during the depositing process were studied and compared. The deposition mechanism of LHPS and APS technologies was compared and analyzed. The APS WC-10 Co4 Cr coating's main deposition mechanism was mechanical bonding method, with bonding strength of 39.5 MPa and the porosity of 1.7%. However, the LHPS WC-10 Co4 Cr coating achieved metallurgical bonding method, with improved bonding strength of 91 MPa and the decreased porosity of 0.86%. Laser hybrid plasma spraying can improve the coating's bonding strength and porosity, which will be beneficial to improving the coating's wear-resistant and corrosion-resistant performances.
引文
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[2]HIRAGA H,INOUE T,MATSYNAWA A,et al.Effect of laser irradiation condition on bonding strength in laser plasma hybrid spraying[J].Surface&coatings technology,2001,138:284-290.
[3]HIRAGA H,INOUE T,KAMADO S,et al.Fabrication of NiTi intermetallic compound coating made by laser hybrid spraying of mechanically alloyed powders[J].Surface&coatings technology,2001,139:93-100.
[4]CHWA S O,OHMORI A.Thermal diffusivity and erosion resistance of Zr O2-8wt.%Y2O3 coatings prepared by a plasma laser hybrid spraying technique[J].Thin solid films,2002,415:160-166.
[5]CHWA S O,OHMORI A.Microstructures of ZrO2-8wt.%Y2O3 coatings prepared by a plasma laser hybrid spraying technique[J].Surface&coatings technology,2002,153(2):304-312.
[6]OUYANG J H,SASAKI S.Microstructure and tribological characteristics of ZrO2-Y2O3 ceramic coatings deposited by laser-assisted plasma hybrid spraying[J].Tribology international,2002,35:255-264.
[7]LAURENT D,LIMA R S,MOREAUB C.Properties of alumina-titania coatings prepared by laser-assisted air plasma spraying[J].Surface&coatings technology,2007,201:6278-6284.
[8]杨理京,李祉宏,李波,等.超音速激光沉积法制备Ni60涂层的显微组织及沉积机理[J].中国激光,201542(3):1-8.YANG Li-jing,LI Zhi-hong,LI Bo,et al.Microstructure and deposition mechanism of Ni60 coatings prepared by supersonic laser deposition[J].China laser,2015,42(3):1-8.
[9]贾卫平,井龙,蒙华,等.激光重熔参数对镍基纳米TiN复合电沉积镀层性能的影响[J].表面技术,2016,45(3):78-83.JIA Wei-ping,JING Long,MENG Hua,et al.Effect of laser remelting parameters on properties of nickel-based nano TiN composite deposited coatings[J].Surface technology,2016,45(3):78-83.
[10]贺定勇,傅斌友,蒋建敏,等.含WC陶瓷相电弧喷涂层耐磨粒磨损性能的研究[J].摩擦学学报,2007,27(2):116-120.HE Ding-yong,FU Bin-you,JIANG Jian-min,et al.Abrasive resistance of arc sprayed coatings with a WCceramic phase[J].Tribology,2007,27(2):116-120.
[11]张小锋,周克崧,宋进兵,等.等离子喷涂-物理气相沉积7YSZ热障涂层沉积机理及其CMAS腐蚀失效机制[J].无机材料学报,2015,30(3):287-293.ZHANG Xiao-feng,ZHOU Ke-song,SONG Jin-bing,et al.Deposition and CMAS corrosion mechanism of 7YSZthermal barrier coatings prepared by plasma sprayphysical vapor deposition[J].Journal of inorganic materials,2015,30(3):287-293.
[12]MCPHERSON R.A review of microstructure and properties of plasma sprayed ceramic coatings[J].Surface&coatings technology,1999,39(40):173-181.
[13]WOOD R J K.Tribology of thermal sprayed WC-Co coatings[J].Tnt J refrac metals hard mater,2010,28:82-94.
[14]YANG Q,SENDA T,HIROSE A.Sliding wear behavior of WC-12Co coatings at elevated temperatures[J].Surface&coatings technology,2006,200(14/15):4208-4212.
[15]SHIPWAY P H,MCCARTNEY D G,SUDAPRASERT T.Sliding wear behavior of WC-Co coating[J].Tribol int,2011,44:1711-1719.