| 引用本文: | 杨二娟， 李太江， 李巍， 李勇， 刘刚， 米紫昊.WC颗粒尺寸对WC-CoCr涂层组织与性能的影响[J].中国表面工程,2015,28(4):70~76 |
| YANG Erjuan, LI Taijiang, LI Wei, LI Yong, LIU Gang, MI Zihao.Effect of WC Particle Size on Microstructure and Properties of WC-CoCr Coating[J].China Surface Engineering,2015,28(4):70~76 |
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| 摘要: |
| 喷涂粉末颗粒尺寸是影响碳化钨涂层性能的关键因素。采用HVOF工艺制备3种不同WC颗粒尺寸的WCCoCr涂层，利用扫描电镜、X射线衍射仪、显微硬度计和颗粒冲蚀磨损试验机等对涂层的组织结构及性能进行分析，系统研究了WC颗粒尺寸对涂层组织及性能的影响。结果表明：FNWC涂层中碳化钨分解严重，PNWC及MWC涂层中碳化钨颗粒少量分解。FNWC、PNWC及MWC涂层孔隙率分别为2.1%、2.0%和2.3%，硬度分别为1 254、1 241和1 229 HV0.3，结合强度分别为68.7、73.5和72.9 MPa。15°攻角下FNWC、PNWC及MWC涂层的抗冲蚀磨损阻力Re分别为9.3×104、15.5×104和10.74×104 g/cm3，90°攻角下的抗冲蚀磨损阻力Re分别为4.68×104、4.70×104和4.26×104 g/cm3。PNWC涂层组织更均匀，WC相分解轻微，涂层硬度分布更集中，结合强度最高，在15°攻角下表现出最好的耐冲蚀性，综合性能优异。 |
| 关键词: 超音速火焰喷涂（HVOF） WCCoCr涂层 冲蚀磨损 |
| DOI：10.11933/j.issn.1007-9289.2015.04.009 |
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| Effect of WC Particle Size on Microstructure and Properties of WC-CoCr Coating |
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YANG Erjuan, LI Taijiang, LI Wei, LI Yong, LIU Gang, MI Zihao
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Xi’an Thermal Power Research Institute
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| Abstract: |
| Particle size of spraying powder is the key factor which affets the properties of tungsten carbide coating. Three types of WCCoCr coatings with different WC particle size were sprayed by high velocity oxyfuel (HVOF). The microstructure and properties were analyzed by SEM, XRD, microhardness tester, particle erosion abrasion tester and so on. The results show that the decomposition of WC is serious in the FNWC coating, while little decomposition of WC is observed in the PNWC coating and MWC coating. The porosity of FNWC coating, PNWC coating and MWC coating are 2.1%, 2.0% and 2.3%,respectivly.The micro hardness are 1 254, 1 241 and 1 229 HV0.3 for the three kind of coatings. The bonding strength of FNWC coating, PNWC coating and MWC coating are 68.7, 73.5 and 72.9 MPa. The erosion wear resistance of the FNWC coating, PNWC coating and MWC coating under attack an angle of 15° are 9.3×104, 15.5×104 and 10.74×104 g/cm3, while the erosion wear resistance are 4.68×104, 4.70×104 and 4.26×104 g/cm3 under an attack angle of 90°. Compared with FNWC coating and MWC coating, the PNWC coating shows uniform microstructure, slight decomposition of WC, concentrated distribution of hardness value, high bonding strength and good erosion wear resistance under an attack angle of 15°and thus an excellent comprehensive performance. |
| Key words: high velocity oxygenfuel spraying(HVOF) WCCoCr coating abrasive wear |
