本文關鍵詞：碳基復合薄膜抗月塵損傷設計及其摩擦學行為研究　出處：《蘭州交通大學》2016年碩士論文　論文類型：學位論文

  更多相關文章： 空間環(huán)境 MoS_2/DLC多層薄膜 月塵 摩擦磨損 復合轉移膜

【摘要】：空間月塵環(huán)境是人類月球探索經(jīng)常或必須面對的特殊環(huán)境。目前,航天器系統(tǒng)中的許多機動部件的可靠性嚴重受到月塵的威脅。類金剛石薄膜(diamond-like carbon films,簡稱DLC薄膜)和二硫化鉬薄膜因其優(yōu)異的摩擦學性能而被廣泛應用于太空環(huán)境,但是,對于該類固體潤滑薄膜在月塵環(huán)境中的損傷和摩擦學行為的研究鮮有系統(tǒng)工作。本論文基于碳基固體潤滑復合薄膜的成分和結構設計,采用中頻磁控濺射技術成功制備了不同調質周期的MoS_2/DLC多層固體潤滑薄膜。選用航天510所人工模擬合成的月塵作為三體磨粒,系統(tǒng)考察了MoS_2/DLC多層固體潤滑薄膜在無塵和月塵環(huán)境下的摩擦學性能,明確了載荷、轉速、摩擦時長等因素對固體潤滑薄膜材料摩擦學性能的影響,深入分析并探討了MoS_2/DLC多層薄膜在月塵環(huán)境中摩擦磨損機制,研究結果表明:1.所制備的MoS_2/DLC多層薄膜表面光滑、粗糙度小,截面均勻致密。通過機械性能和真空摩擦性能對比發(fā)現(xiàn),最優(yōu)調制周期數(shù)為2,即MoS_2/DLC-4L薄膜。2.在真空無塵環(huán)境下,MoS_2/DLC-4L薄膜的摩擦系數(shù)和磨損率隨著轉速的增加都呈現(xiàn)出先減小后增加的趨勢,而載荷對MoS_2/DLC-4L薄膜的摩擦磨損影響并不顯著。在真空月塵條件下,MoS_2/DLC-4L薄膜的摩擦系數(shù)在低載(3 N)和高載(10 N)下具有明顯的波動,而在中載(5、7 N)下具有穩(wěn)定的摩擦系數(shù)。磨損率無明顯規(guī)律,但在高載下薄膜失效。在施加載荷為7 N、轉速180 r/min時,MoS_2/DLC-4L薄膜的磨損率隨摩擦時間的增加呈指數(shù)降低的趨勢。初始磨損較高是由于表層(MoS_2層)硬度低,易被月塵顆粒刮離;穩(wěn)定階段,DLC層作為承載層減緩磨損。3.單層MoS_2薄膜在真空月塵環(huán)境下磨損壽命短,這是由于薄膜自身硬度低的緣故;單層DLC薄膜由于黏著效應導致其真空月塵下高摩擦系數(shù)。而MoS_2/DLC-4L薄膜在真空月塵環(huán)境下不僅具有穩(wěn)定的摩擦系數(shù)(低至0.02),其磨損壽命也大大提高4.在真空月塵環(huán)境下,隨著摩擦時間的增加,MoS_2/DLC-4L薄膜的磨痕處形成了大量的“脊”層,使得月塵顆粒可以在摩擦界面有效的滾動,實現(xiàn)低摩擦和低磨損。同時,在接觸應力作用下,月塵顆粒破碎形成的微納米顆粒、薄膜材料及磨屑在界面處形成一層復合轉移膜,該轉移膜的形成也可有效降低摩擦和磨損。
[Abstract]:The space environment is the human lunar exploration lunar special environment or often must face. At present, the reliability of many moving components in spacecraft systems severely dust threats. Diamond film (diamond-like carbon films, referred to as DLC film) and MoS2 film because of its excellent tribological properties and is widely used in the space environment, but for study on the tribological behavior of the rare injury and solid lubricating film in the dust in the environment. The composition and structure of carbon based solid lubricating composite film based on the design of MoS_2/DLC multilayer solid lubrication films prepared by different conditioning cycle medium frequency magnetron sputtering system. The successful selection of space 510 synthetic dust as abrasive, investigated the tribological properties of MoS_2/DLC multilayer solid lubrication film in clean and dust environment, Ming The effect of friction speed, load, long time and other factors on the tribological properties of solid lubricating film materials, deeply analyzes and discusses the MoS_2/DLC multilayer film in friction and wear mechanism in the dust environment, the results showed: 1. the preparation of the MoS_2/DLC multilayer films with smooth surface roughness, small section, uniform and compact. The mechanical performance and vacuum friction performance comparison, the optimal modulation period number is 2, the MoS_2/DLC-4L film.2. in vacuum clean environment, and the wear rate along with the increase of speed presents the trend of first increase and then decrease the friction coefficient of MoS_2/DLC-4L films, MoS_2/DLC-4L films and load on the friction and wear effect is not significant. In the vacuum dust under the condition of friction the coefficient of MoS_2/DLC-4L thin films at low load (3 N) and high (10 N) had obvious fluctuations, and in the load (5,7 N) has stable friction coefficient. The wear rate of ignorance The explicit rules, but in the film under high load failure. In the applied load is 7 N, the speed of 180 r/min, the wear rate of MoS_2/DLC-4L thin films with the friction time increases exponentially decreasing trend. The initial wear is higher due to surface layer (MoS_2 layer) of low hardness, easy to be scraped from the lunar particles; stable stage. The DLC layer as the bearing layer abrasion.3. single-layer MoS_2 film in vacuum dust environment wear short life, this is due to the film itself because of their low hardness; single layer DLC thin films due to adhesion effect leads to high friction coefficient of the vacuum dust. And MoS_2/DLC-4L films in the vacuum dust environment not only has the stable friction coefficient (low to 0.02) and the wear life is also greatly improved in the 4. vacuum dust environment, along with the increase of friction time, grinding marks the formation of a large number of "ridge" layer of MoS_2/DLC-4L films, the lunar particles can roll in friction interface effectively , low friction and low wear. At the same time, the contact stress under the action of micro nano particles formed by crushing dust particles, thin film material and debris to form a layer of composite transfer film on the interface, the formation of the transfer film can effectively reduce friction and wear.

【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：V476.3

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