ISSN   1004-0595

CN  62-1095/O4

高级检索
耿哲, 段德莉, 刘阳, 李曙. 环境气氛与温度对钴基碳化钨超音速火焰喷涂(HVOF)层磨损行为的影响[J]. 摩擦学学报, 2014, 34(3): 240-247.
引用本文: 耿哲, 段德莉, 刘阳, 李曙. 环境气氛与温度对钴基碳化钨超音速火焰喷涂(HVOF)层磨损行为的影响[J]. 摩擦学学报, 2014, 34(3): 240-247.
GENG Zhe, DUAN De-li, LIU Yang, LI Shu. The Effect of Atmosphere on Wear Behaviors of HVOF Sprayed WC-Co Coatings at Elevated Temperatures[J]. TRIBOLOGY, 2014, 34(3): 240-247.
Citation: GENG Zhe, DUAN De-li, LIU Yang, LI Shu. The Effect of Atmosphere on Wear Behaviors of HVOF Sprayed WC-Co Coatings at Elevated Temperatures[J]. TRIBOLOGY, 2014, 34(3): 240-247.

环境气氛与温度对钴基碳化钨超音速火焰喷涂(HVOF)层磨损行为的影响

The Effect of Atmosphere on Wear Behaviors of HVOF Sprayed WC-Co Coatings at Elevated Temperatures

  • 摘要: 采用球/盘试验机研究WC-12Co和WC-17Co超音速火焰喷涂(HVOF)层在大气和Ar气环境中室温至650 ℃的磨损行为,结合磨痕形貌的SEM观测、成分的EDX和氧化物相的Raman光谱分析,探索涂层氧化和磨损的相互关系.结果表明:氧在WC-Co涂层的磨损过程中发挥至关重要的作用.在大气环境中,WC-Co涂层在室温至550 ℃形成的氧化物能减轻磨损,属氧化抑制磨损;650 ℃时氧化剧烈,涂层磨损严重,属氧化加速磨损.在Ar气环境中,WC-Co涂层在室温至550 ℃范围内的磨损严重程度远高于大气环境中试验的结果;由于高温下磨痕表面仍会生成少量氧化物,致使涂层的体积流失量呈现随温度升高而下降的特征;650 ℃时涂层的强烈氧化受到抑制,使其体积流失量甚至低于大气环境中的损失量.因此,乏氧环境中WC-Co涂层无论是在常温还是高温条件下均不宜作为耐磨涂层应用.

     

    Abstract: Wear behaviors of HVOF sprayed WC-12Co and WC-17Co coatings at temperatures from room temperature (RT,~25 ℃) up to 650 ℃ in air and in argon were studied by a ball-on-disc tribometer. The wear track morphologies,compositions and oxide phases after rubbing tests were investigated by scanning electron microscopy,energy dispersive X-ray spectrometer and Raman spectroscopy. The synergistic effect of oxidation and wear of coatings was investigated. The results show that oxygen played an important role during wear of WC-Co coatings. In air,the oxides on the wear tracks reduced wear at RT ~ 550 ℃,which means that the oxidation inhibited wear. At 650 ℃,the vigorous oxidation degraded the coating properties and resulted in the severe wear,which means that the oxidation aggravated wear. In argon,the wear of coatings was severe at RT ~ 550 ℃ and was significantly higher than that in air. The wear decreased as the temperature elevated due to mild oxidization. At 650 ℃,the wear of the coating was even lower than that in air,which is attributed to the inhibition of vigorous oxidation. As a result,WC-Co coatings should not be used as wear-resistant coatings in the oxygen-deficient environment whether at RT or at elevated temperatures.

     

/

返回文章
返回