For further clarify the correlation mechanism between the high temperature oxidation and tribological properties of cemented carbide, two groups of test samples of YT15 cemented carbide were prepared and heated to 500 °C ~ 900 °C, then cooled to room temperature in air and cutting fluid medium respectively. The surface morphology, oxidation characteristics, hardness, wettability, and tribological property were measured with white light interferometer, XRD instrument, contact angle measuring instrument, and MWF-500 friction tester. Experimental results indicate that the surface roughness and oxidation degree are increased with the increasing of heating temperature and independent of the cooling medium. Thus, a decrease law of friction coefficient and a worsening trend of surface wear quantity are observed due to low surface hardness under dry friction condition. For cutting fluid lubricating case, the friction coefficient of test sample is firstly decreased with the heating temperature increasing, and then an increased trend is occurred when the heating temperature is more than 800 °C. The main reason is that more wear particles are produced due to the low surface hardness and big contact pressure which deteriorated the lubrications conditions. The main contribution of this work is in providing a reference resources for the tool surface wear mechanism.

为进一步阐明硬质合金高温氧化与摩擦学性能之间的相关机理，制备了两组YT15硬质合金试样，加热至500℃～900℃，然后在空气和切削液中冷却至室温分别为中。采用白光干涉仪、XRD仪、接触角测量仪和MWF-500摩擦测试仪对表面形貌、氧化特性、硬度、润湿性和摩擦学性能进行测量。实验结果表明，表面粗糙度和氧化程度随着加热温度的升高而增加，并且与冷却介质无关。因此，在干摩擦条件下，由于表面硬度低，摩擦系数有下降规律，表面磨损量有恶化趋势。对于切削液润滑情况，试验样品的摩擦系数随着加热温度的升高先减小，然后在加热温度超过800℃时出现增加的趋势。主要原因是由于表面硬度低和接触压力大而产生更多的磨损颗粒，使润滑条件恶化。这项工作的主要贡献是为工具表面磨损机制提供了参考资源。然后当加热温度超过 800 ℃时有增加的趋势。主要原因是由于表面硬度低和接触压力大而产生更多的磨损颗粒，使润滑条件恶化。这项工作的主要贡献是为工具表面磨损机制提供了参考资源。然后当加热温度超过 800 ℃时有增加的趋势。主要原因是由于表面硬度低和接触压力大而产生更多的磨损颗粒，使润滑条件恶化。这项工作的主要贡献是为工具表面磨损机制提供了参考资源。