【摘要】：近幾年來,高溫、低溫、高真空、高負載、強輻射等特殊工況條件下的摩擦磨損對工業(yè)生產(chǎn)造成了巨大的能源浪費。正確地使用潤滑材料,減少特殊工況條件下機械運動系統(tǒng)中與摩擦磨損相關的機械失效引起了人們的關注。最近,石墨烯及其相關的二維納米材料(如過渡族金屬硫化物)憑借其獨特的性能尤其是超薄的厚度和獨特的二維平面結構成為了近年來材料研究領域的熱點之一,并廣泛應用于催化、能量儲備和電子器件中。然而,石墨烯與二維過渡族金屬硫化物在摩擦學領域應用還處于初級階段。本論文在參考相關文獻成果的基礎上,針對日益嚴重的摩擦造成的能源浪費問題,重點介紹利用二維材料的摩擦學性能來降低摩擦磨損,并對其未來發(fā)展進行了展望。本論文的具體內(nèi)容包括:1,采用表面活性劑輔助的水熱法合成MoS_2/石墨烯二維復合材料。采用XRD,SEM,HRTEM和Raman光譜對復合材料的結構進行了表征,驗證了產(chǎn)物的形貌和微觀結構;探討了復合材料的形成機理。我們將MoS_2/石墨烯作為液體潤滑添加劑,考察其摩擦學性能。結果表明,復合材料表現(xiàn)出了優(yōu)異的摩擦學性能指標(平均摩擦系數(shù)~0.09和磨損率~2.08×10-5 mm3/Nm)。此外,我們考察了所制備的MoS_2/石墨烯復合材料對環(huán)氧樹脂(E-44)涂層摩擦學性能的影響。結果表明,添加5 wt%的MoS_2/石墨烯復合材料能夠有效改善涂層的摩擦磨損性能。2,以商業(yè)化的石墨和MoS_2為原料,采用球磨法一步合成MoS_2/石墨烯復合材料。研究了石墨與MoS_2的不同質(zhì)量比對產(chǎn)物的影響。結果表明,當MoS_2納米片的含量較高時能夠覆蓋在石墨片表面,在球磨剝離過程扮演類似膠帶的作用來實現(xiàn)石墨烯的剝離。系統(tǒng)考察環(huán)氧樹脂涂層摩擦學性能隨MoS_2/石墨烯復合材料含量變化的關系。結果發(fā)現(xiàn),填充少量的MoS_2/石墨烯復合材料能夠有效的降低涂層的摩擦系數(shù),提高涂層的抗磨壽命。對比分析了試驗載荷對摩擦學行為的影響。結果表明,隨載荷的增加,雖然摩擦系數(shù)有所下降,但是磨損率有較大增加。3,以固相燒結合成的NbSe2作為前驅(qū)體,采用球磨法合成NbSe2納米片及其與石墨烯的復合材料。研究了球磨時間對產(chǎn)物形貌的影響。結果表明,隨著球磨時間的增加NbSe2在有序堆疊的c軸方向的相關長度將減少,即有利于NbSe2納米片的剝離。系統(tǒng)考察了添加所制備的二維NbSe2納米片及其復合材料對環(huán)氧樹脂涂層摩擦學性能的影響。結果表明,環(huán)氧樹脂復合涂層的摩擦系數(shù)隨著NbSe2納米片含量增加(從0至20%)急劇減少到最低值從0.337至0.062(降低了80%),磨損率也大幅下降;添加少量NbSe2/G可以明顯改善環(huán)氧涂層的減摩抗磨性能;當NbSe2/G含量較高時,破壞了涂層的連續(xù)性,填料與聚合物之間的結合強度降低,從而造成聚合物涂層的摩擦磨損性能降低。
[Abstract]:In recent years, friction and wear under special working conditions such as high temperature, low temperature, high vacuum, high load and strong radiation have caused great energy waste to industrial production. The correct use of lubricating materials to reduce the mechanical failure related to friction and wear in the mechanical motion system under special working conditions has attracted people's attention. Recently, graphene and its related two-dimensional nanomaterials (such as transition metal sulphides) have become one of the hot research fields in recent years because of their unique properties, especially ultra-thin thickness and unique two-dimensional planar structure. And widely used in catalysis, energy storage and electronic devices. However, the application of graphene and two-dimensional transition metal sulfides in tribology is still in its infancy. On the basis of referring to the related literature, this paper focuses on the use of tribological properties of two-dimensional materials to reduce friction and wear in the light of the increasingly serious energy waste caused by friction, and prospects for its future development. The main contents of this thesis are as follows: 1. MoS_2/ graphene two-dimensional composites were synthesized by hydrothermal method assisted by surfactants. The structure of the composites was characterized by XRD,SEM,HRTEM and Raman spectra, the morphology and microstructure of the composites were verified, and the formation mechanism of the composites was discussed. The tribological properties of MoS_2/ graphene as liquid lubricating additive were investigated. The results show that the composites exhibit excellent tribological properties (average friction coefficient ~ 0.09 and wear rate ~ 2.08 脳 10 ~ (-5) mm3/Nm). In addition, the effect of MoS_2/ graphene composite on tribological properties of epoxy resin (E-44) coating was investigated. The results show that 5 wt% MoS_2/ graphene composites can effectively improve the friction and wear properties of the coatings. 2. Commercial graphite and MoS_2 were used as raw materials to prepare MoS_2/ graphene composites by ball milling. The effect of different mass ratio of graphite to MoS_2 on the product was studied. The results show that when the content of MoS_2 nanocrystalline is high, it can cover the surface of graphite sheet and play a similar role as tape in the process of ball-milling stripping to realize the exfoliation of graphene. The relationship between the tribological properties of epoxy resin coating and the content of MoS_2/ graphene composite was investigated systematically. The results show that the friction coefficient of the coating can be reduced and the wear resistance life of the coating can be improved by filling a small amount of MoS_2/ graphene composite. The effect of test load on tribological behavior is compared and analyzed. The results show that with the increase of load, the friction coefficient decreases, but the wear rate increases greatly. 3. Using NbSe2 synthesized by solid phase sintering as precursor, NbSe2 nanochips and their composites with graphene are synthesized by ball milling method. The effect of milling time on the morphology of the product was studied. The results show that with the increase of milling time, the correlation length of NbSe2 in the c-axis direction of orderly stacking will decrease, that is to say, it is advantageous to the stripping of NbSe2 nanocrystals. The tribological properties of epoxy resin coatings were investigated by adding two-dimensional NbSe2 nanochips and their composites. The results showed that the friction coefficient of epoxy resin composite coating decreased sharply with the increase of NbSe2 content (from 0 to 20%) to the lowest value from 0.337 to 0.062 (decreased by 80%), and the wear rate also decreased significantly. When the content of NbSe2/G is high, the continuity of the coating is destroyed and the bonding strength between filler and polymer decreases, which results in the decrease of friction and wear properties of the coating.
【學位授予單位】：江蘇大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB332

【參考文獻】

相關期刊論文 前1條

1 門學虎;張招柱;楊進;王坤;姜葳;;碳納米管-TiO_2雜化材料對聚糠醇涂層摩擦學性能的影響[J];中國表面工程;2010年03期

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本文編號：2265341