發(fā)布時間：2018-11-29 10:13

【摘要】：針對防護涂層在受動載時的磨損問題,在動能控制模式的沖擊試驗機上,通過動力學(xué)響應(yīng)考察了Cr-DLC涂層的沖擊磨損行為。響應(yīng)包括沖擊力波形和沖擊動能的能量耗散,并以其基體304不銹鋼作為對比材料。結(jié)果表明:材料的動力學(xué)響應(yīng)差異反映了其抗沖擊性的優(yōu)劣。相同試驗條件下,Cr-DLC涂層的沖擊力峰值和能量吸收率分別低于304不銹鋼約42.0%~51.8%和18.6%~20.8%。此外,還發(fā)現(xiàn)在沖擊動能相同的情況下,調(diào)整速度或質(zhì)量將會對動力學(xué)行為產(chǎn)生顯著的影響。質(zhì)量增大,沖擊力峰值降低、接觸時間延長;而增加速度僅提升沖擊力峰值。通過動力學(xué)響應(yīng)可定性的判斷材料抗沖擊性能,且與實際磨損結(jié)果有較好的吻合。Cr-DLC涂層由于其優(yōu)異的抗沖擊磨損性能以及良好化學(xué)穩(wěn)定性,使其磨痕表面僅有少量的磨損剝落,且磨損氧化現(xiàn)象不明顯;304不銹鋼的沖擊損傷形貌為典型的剝層磨損,材料去除和氧化反應(yīng)首先發(fā)生在表面的剝層。
[Abstract]:Aiming at the wear problem of protective coating under dynamic load, the impact wear behavior of Cr-DLC coating was investigated by dynamic response on a kinetic energy controlled impact tester. The response includes the energy dissipation of the shock wave and kinetic energy, and the substrate 304 stainless steel is used as the contrast material. The results show that the difference of dynamic response reflects the impact resistance of the material. Under the same test conditions, the peak impact force and energy absorption rate of Cr-DLC coating are lower than that of 304 stainless steel by 51.8% and 18.6%, respectively. In addition, it is also found that adjusting the velocity or mass will have a significant effect on the dynamic behavior when the kinetic energy of the impact is the same. With the increase of mass, the peak value of impact force decreases and the contact time is prolonged, while the increasing velocity only increases the peak value of impact force. The impact resistance of the material can be judged qualitatively by the kinetic response, and it is in good agreement with the actual wear results. The Cr-DLC coating is characterized by its excellent impact wear resistance and good chemical stability. Only a small amount of wear exfoliation occurred on the worn surface, and the phenomenon of wear oxidation was not obvious. The impact damage morphology of 304 stainless steel is typical delamination. The material removal and oxidation reaction occur first on the surface.
【作者單位】： 西南交通大學(xué)摩擦學(xué)研究所;
【基金】：國家自然科學(xué)基金(51375407,51575459,U1530136,51627806) 四川省青年科技創(chuàng)新研究團隊(2017TD0017)~~
【分類號】：TG174.4
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本文編號：2364715