【摘要】：鈦合金因其優(yōu)異的綜合性能而在諸多領(lǐng)域得到廣泛應(yīng)用,但較差的摩擦磨損性能卻限制了鈦合金的應(yīng)用。人造摩擦層可顯著提高鈦合金的耐磨性,但對其破壞、作用機(jī)理及不同結(jié)構(gòu)人造摩擦層對鈦合金摩擦磨損性能的影響缺乏深入、系統(tǒng)的研究。本文在TC11合金/GCr15鋼滑動界面添加不同混合方式的Fe_2O_3、多層石墨烯、MoS2納米材料,以制備不同人造摩擦層。研究人造摩擦層對TC11合金在不同載荷、速度下摩擦磨損行為的影響,采用XRD、Raman、SEM、EDS等手段對二次磨損前后TC11合金的磨面和剖面物相、形貌及成分進(jìn)行了分析,基于摩擦層的特征變化探索了其破壞過程,并探討了不同人造摩擦層的作用機(jī)理及其對TC11合金摩擦磨損性能的影響。此項研究為鈦合金的摩擦學(xué)設(shè)計提供了科學(xué)依據(jù),具有重要的理論意義和工程應(yīng)用價值。結(jié)果表明,添加Fe_2O_3時,無論何種載荷或速度下,TC11合金的磨損失重與平均摩擦系數(shù)均較高,且與未添加時的相當(dāng)。添加多層石墨烯/Fe_2O_3、MoS2+Fe_2O_3時,磨損失重與平均摩擦系數(shù)在一定載荷或速度范圍內(nèi)較低,而后呈線性增長。而添加多層石墨烯+Fe_2O_3時,在全部載荷、速度內(nèi),磨損失重及平均摩擦系數(shù)幾乎均保持極低值。研究發(fā)現(xiàn),滑動界面上添加不同納米材料,誘導(dǎo)TC11合金表面形成結(jié)構(gòu)相異的人造摩擦層。添加Fe_2O_3時形成單層摩擦層,因其欠缺潤滑性而極易破壞,磨面呈粘著、撕裂痕跡及犁溝,且亞表層發(fā)生變形。含MoS2和Fe_2O_3的機(jī)械混合摩擦層及含多層石墨烯和Fe_2O_3的雙層摩擦層因同時具有潤滑、承載能力而易于保留至二次磨損結(jié)束。然而,機(jī)械混合摩擦層和分層不明顯的雙層摩擦層中所含組分較均勻分布限制了其潤滑作用的發(fā)揮,導(dǎo)致其在較高載荷或速度下發(fā)生破壞,磨損表面及亞表面呈現(xiàn)犁溝、粘著痕跡及塑性變形。添加多層石墨烯+Fe_2O_3時形成的雙層摩擦層因分層更明顯而潤滑性能極佳,所有條件下幾乎均穩(wěn)定存在而不破壞。單層人造摩擦層不能改善TC11合金的摩擦磨損性能,相比于機(jī)械混合人造摩擦層和分層不明顯的雙層人造摩擦層,分層明顯的雙層人造摩擦層可更顯著地提高TC11合金的耐磨性和減摩性。
[Abstract]:Titanium alloys are widely used in many fields because of their excellent comprehensive properties, but the poor friction and wear properties limit the application of titanium alloys. The wear resistance of titanium alloy can be improved obviously by artificial friction layer, but the failure, the mechanism of action and the influence of artificial friction layer of different structure on the friction and wear properties of titanium alloy are not thoroughly studied. In this paper, Fe_2O_3, multilayer graphene and MoS2 nanomaterials with different mixing modes were added to the sliding interface of TC11 alloy / GCr15 steel to prepare different artificial friction layers. The effect of artificial friction layer on the friction and wear behavior of TC11 alloy under different loads and speeds was studied. The wear surface, profile phase, morphology and composition of TC11 alloy before and after secondary wear were analyzed by means of XRD,Raman,SEM,EDS. Based on the characteristic change of friction layer, the failure process was investigated, and the action mechanism of different artificial friction layer and its influence on the friction and wear properties of TC11 alloy were discussed. This study provides a scientific basis for the tribological design of titanium alloys and has important theoretical significance and engineering application value. The results show that the wear weight loss and the average friction coefficient of TC11 alloy are higher when Fe_2O_3 is added under any load or velocity, and is similar to that of the alloy without adding TC11. When the multilayer graphene / Fe_2O_3,MoS2 Fe_2O_3 was added, the wear weight loss and the average friction coefficient were lower in a certain range of load or velocity, and then increased linearly. However, the wear weight loss and the average friction coefficient are almost kept very low at all loads and speeds when adding multilayer graphene Fe_2O_3. It is found that different nano-materials are added to the sliding interface to induce the formation of artificial friction layer with different structure on the surface of TC11 alloy. A single layer friction layer is formed when Fe_2O_3 is added, which is easy to destroy because of its lack of lubricity. The abrasive surface is adhesive, tearing marks and furrows, and the subsurface layer is deformed. The mechanical mixed friction layer containing MoS2 and Fe_2O_3 and the double friction layer containing multilayer graphene and Fe_2O_3 are easy to be retained until the end of secondary wear due to their lubricating capacity and bearing capacity. However, the more uniform distribution of the components in the mechanical mixed friction layer and the stratified double-layer friction layer limits its lubricating function, resulting in its failure at higher load or velocity, and the ploughing of the worn surface and the sub-surface. Adhesion marks and plastic deformation. The double-layer friction layer formed by adding multilayer graphene Fe_2O_3 has excellent lubricating performance because of its obvious delamination, and almost all of the layers exist stably without destruction under all conditions. The friction and wear properties of TC11 alloy can not be improved by single layer artificial friction layer, compared with mechanical mixing layer and double layer artificial friction layer. The wear resistance and friction reduction of TC11 alloy can be improved more obviously by the layer of double layer artificial friction layer.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG174.4

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