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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.
The wear behaviors of WC-12Co and WC-17Co HVOF coatings at room temperature to 650 ℃ in air and Ar atmosphere were studied by ball / disk tester. Combined with SEM observation of wear scar morphology, EDX and Oxide phase Raman spectroscopy to explore the relationship between the oxidation and wear of the coating.The results show that oxygen play a crucial role in the wear process of the WC-Co coating.In the atmospheric environment, the WC-Co coating in the Oxides formed from room temperature to 550 ℃ can reduce the wear and tear of the steel, which is oxidized to suppress wear and tear; severe oxidation occurs at 650 ℃, and the wear of the coating is serious, which accelerates wear and tear of the oxide.In the Ar gas environment, WC- The severity of wear is much higher than the atmospheric test results; due to the surface of the wear scar under high temperature will still generate a small amount of oxide, resulting in coating volume loss showed a decline with increasing temperature characteristics; 650 ℃ coating Of the strong oxidation is suppressed, so that the volume loss even lower than the loss of the atmosphere.Therefore, the application of the WC-Co coating in the anoxic environment at both normal temperature and high temperature should not be used as a wear-resistant coating.