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在HT-1000型高温摩擦磨损试验机上对EM42高速钢与氮化硅(Si3N4)陶瓷配副进行干滑动摩擦磨损试验,利用SEM观察并分析了摩擦面的磨损形貌及磨损机理。结果表明:EM42高速钢与氮化硅(Si3N4)陶瓷在干摩擦条件下,随着摩擦速度的增加,摩擦系数的变化幅度和磨损量都逐渐降低。摩擦表面由低速的犁沟、硬质相(MC)的剥离脱落,转向表面硬质相(MC)磨粒对EM42高速钢的挤压犁沟、疲劳脱落,再到摩擦表面润滑膜的最终形成;其磨损机理由低速的EM42高速钢表面的硬质相被撞击破碎或剥落而形成磨粒磨损,氧化疲劳磨损转变为高速表面的氧化疲劳磨损和磨粒磨损。
Dry friction and wear tests of EM42 high speed steel and silicon nitride (Si3N4) ceramic were carried out on a HT-1000 high temperature friction and wear tester. The wear morphology and wear mechanism of the friction surface were observed and analyzed by SEM. The results show that under the condition of dry friction, the friction coefficient and wear rate of EM42 high speed steel and Si3N4 ceramic decrease with the increase of friction speed. The friction surface is separated from the furrow (MC) and the furrow (MC) at the low speed, and is turned to the extrusion furrow of the EM42 high-speed steel by the surface hard phase (MC) abrasive particles, and then to the final formation of the friction surface lubricating film . The wear mechanism is that the hard phase on the surface of EM42 high-speed steel at low speed is crushed or peeled to form abrasive wear, and the oxidative fatigue wear changes to oxidative fatigue wear and abrasive wear on high-speed surface.