• CN:11-2187/TH
  • ISSN:0577-6686

›› 2011, Vol. 47 ›› Issue (24): 63-68.

• 论文 • 上一篇    下一篇

颗粒致密度对WC-10Co-4Cr涂层性能的影响

王志平;程涛涛;丁坤英   

  1. 中国民航大学天津市民用航空器适航与维修重点实验室
  • 发布日期:2011-12-20

Effect of Particle-density on the Performance of WC-10Co-4Cr Coating

WANG Zhiping;CHENG Taotao;DING Kunying   

  1. Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China
  • Published:2011-12-20

摘要: 利用超声速火焰喷涂技术(High velocity oxygen fuel, HVOF)并采用两种不同颗粒致密度的WC-10Co-4Cr合金粉末在300M钢表面制备涂层。采用扫描电镜、X射线衍射仪、显微硬度计等设备对两种涂层的微观组织结构及特性进行分析,重点研究碳化钨颗粒的沉积过程,并通过腐蚀电化学试验研究两种涂层的耐腐蚀性能。结果表明,高颗粒致密度粉末在喷涂过程中WC相分解率为15.74%,是低颗粒致密度粉末的1.34倍,喷涂过程中WC相的分解率由碳化钨颗粒在超声速焰流中吸收的热能和颗粒中钴包WC粒子的包覆性两方面因素共同决定;高颗粒致密度粉末制备的涂层的孔隙率为1.52%,显微硬度为1 218 HV,分别是低颗粒致密度粉末制备的涂层的1.95倍和1.04倍,颗粒中钴包碳化钨粒子的铺展性是影响涂层孔隙率及显微硬度的关键因素;腐蚀电化学试验结果表明,颗粒致密度较低的碳化钨粉末制备的涂层耐腐蚀性能较好。

关键词: WC-10Co-4Cr, 超声速火焰喷涂, 颗粒致密度, 耐腐蚀性能, 铺展性

Abstract: Two kinds of WC-10Co-4Cr coating with different particle-density are deposited on 300M steel by high velocity oxygen fuel (HVOF) technology. The microstructure and properties are analyzed by scanning electron microscope, X-ray diffraction and micro-hardness tester. The depositing process of WC particles is focused on. And the corrosion resistance of each coating is analyzed by experiment in erosive electrochemistry. The results indicate that, during the course of spraying of high particle-density powder, the decomposing rate of WC is 15.47%, which is 1.34 times of that of low particle-density powder. The decomposing rate of WC during spraying is determined by both the energy absorbed from the flame and the capsulation of WC particles. The porosity of high particle-density coating is 1.52% and micro-hardness is 1 218 HV, which are 1.95 times and 1.04 times of that of low particle-density coating respectively. The spreading ability of WC particle is the key factor which affecting the porosity and the micro-hardness of the coating. The result of experiment in erosive electrochemistry shows that the corrosion resistance of low particle-density coating is better than that of high particle-density coating.

Key words: Corrosion resistance, High velocity oxygen fuel(HVOF), Particle-density, Spreading ability, WC-10Co-4Cr

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