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在经过改造的霍普金森压杆装置上进行高速摩擦磨损试验,研究了不同弹体冲击速度对W-20%Cu/7075Al、W-20%Cu/45钢摩擦磨损特性的影响,并探讨了磨损机理。结果表明:W-20%Cu/7075Al在高速条件下主要发生粘着磨损、磨粒磨损和氧化磨损,W-20%Cu/45钢在高速条件下主要发生粘着磨损和磨粒磨损。W-20%Cu/7075Al和W-20%Cu/45钢对偶件的摩擦系数相近,均在0.03~0.20以内;随滑动速度加快,W-20%Cu/7075Al、W-20%Cu/45钢的摩擦系数均减小;在同一滑动速度下,随摩擦次数的增多,W-20%Cu/7075Al对偶件摩擦系数的变化趋势是先降低后升高,然后趋于稳定,而W-20%Cu/45钢是先升高后降低,然后趋于稳定。W-20%Cu/7075Al、W-20%Cu/45钢对偶件的磨损率均呈负值,且随着滑动速度的加快,磨损率绝对值均呈减小趋势。
The effect of different impact velocity on the friction and wear properties of W-20% Cu / 7075Al and W-20% Cu / 45 steel was studied in a modified Hopkinson pressure bar apparatus. Wear mechanism. The results show that W-20% Cu / 7075Al mainly sticks to wear, abrasive wear and oxidation wear at high speed. W-20% Cu / 45 steel mainly sticks to wear and abrasive wear at high speed. The friction coefficients of W-20% Cu / 7075Al and W-20% Cu / 45 steel were nearly equal within the range of 0.03-0.20. With the increase of sliding velocity, the friction coefficients of W- 20% Cu / 7075Al and W- 20% Cu / 45 The friction coefficient of steel decreases. At the same sliding speed, the friction coefficient of W-20% Cu / 7075Al pair decreases first and then increases with the increasing of friction frequency, and then tends to be stable. However, W- 20 % Cu / 45 steel is first increased and then decreased, and then stabilized. The wear rates of W-20% Cu / 7075Al and W-20% Cu / 45 steel pairs were all negative, and the absolute value of wear rate decreased with the increase of sliding velocity.