本文選題：電化學(xué)沉積法　切入點：自潤滑鍍層　出處：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：真空,高速,強輻射,強腐蝕以及高溫等極端摩擦環(huán)境條件,不僅限制了液體潤滑劑的使用,還對我國航空航天領(lǐng)域高精密儀器如人造衛(wèi)星、火箭等服役壽命帶來了巨大的挑戰(zhàn)。本論文針對在上述極端摩擦環(huán)境條件下,如何提高工作機械零部件之間潤滑效果,保持咬合部件之間低摩擦系數(shù),提高航天儀器使用壽命而展開。選取具有良好潤滑性能的MoS_2、WS_2固體潤滑劑來取代液體潤滑劑。通過電化學(xué)沉積法,實現(xiàn)MoS_2、WS_2與金屬鎳的共沉積,彌補了單一固體潤滑劑鍍層硬度低、單一金屬鎳鍍層摩擦系數(shù)高等缺點。研究了不同濃度MoS_2、WS_2對Ni-MoS_2、Ni-WS_2復(fù)合鍍層形貌、物相以及摩擦學(xué)性能影響,并確定了MoS_2、WS_2最佳使用濃度;考察了在最佳濃度下的Ni-MoS_2、Ni-WS_2復(fù)合鍍層高溫摩擦性能,確定了復(fù)合鍍層最佳使用溫度。綜合上述實驗數(shù)據(jù),得出以下結(jié)論:1.在對偶件GCr15、20 N載荷條件下,Ni-WS_2復(fù)合鍍層室溫摩擦系數(shù)優(yōu)于Ni-MoS_2復(fù)合鍍層室溫摩擦系數(shù),但潤滑效果均優(yōu)于純鎳鍍層。兩種復(fù)合鍍層最佳使用濃度均在30 g/L時,Ni-30 g/L MoS_2復(fù)合鍍層室溫摩擦系數(shù)最低為0.02~0.03;Ni-30 g/L WS_2復(fù)合鍍層室溫摩擦系數(shù)最低為0.01~0.02。2.高溫摩擦條件下,Ni-WS_2復(fù)合鍍層使用溫度要高于Ni-MoS_2復(fù)合鍍層。Ni-MoS_2復(fù)合鍍層最佳使用溫度在300℃以下,摩擦系數(shù)保持在0.02~0.05之間,在400℃環(huán)境下,Ni-MoS_2復(fù)合鍍層摩擦系數(shù)接近0.15,因為MoS_2顆粒在325℃以上被氧化成MoO_3,失去潤滑作用;Ni-WS_2復(fù)合鍍層最佳使用溫度在400℃以下,摩擦系數(shù)維持在0.01~0.05之間,在500℃環(huán)境下,Ni-WS_2復(fù)合鍍層摩擦系數(shù)接近0.12,因為WS_2顆粒在425℃以上逐漸被氧化成WO3,失去潤滑作用。3.鍍液中添加MoS_2、WS_2能夠使得Ni離子還原電位負(fù)移,且隨著MoS_2、WS_2固體潤滑劑濃度的增加,Ni離子還原電位負(fù)移程度增加,反映了MoS_2、WS_2顆粒促進了陰極極化,在復(fù)合沉積體系中阻礙鎳的沉積,可以進一步提高鍍層結(jié)晶細(xì)致程度。
[Abstract]:Extreme frictional environmental conditions such as vacuum, high speed, strong radiation, strong corrosion and high temperature not only restrict the use of liquid lubricants, but also limit the use of high-precision instruments such as artificial satellites in the field of aerospace in China. The service life of rocket and so on brings great challenge. This paper aims at how to improve lubricating effect between parts of working machinery and keep low friction coefficient between bite parts under the condition of extreme friction environment mentioned above. In order to improve the service life of spaceflight instruments, the solid lubricant MoS _ S _ 2W _ W _ 2 was selected to replace the liquid lubricant. By electrochemical deposition, the co-deposition of MoS2S / WS2 and nickel was realized, which made up for the low hardness of the single solid lubricant coating. The effects of different concentration of MoSs _ 2S _ 2S _ 2 on the morphology, phase and tribological properties of Ni-MoS _ 2 / Ni-WSS _ 2 composite coating were studied, and the optimum use concentration of MoS _ S _ 2W _ (2) W _ (2) was determined. The high temperature friction properties of Ni-MoSSP _ 2Si _ W _ W _ 2 composite coating at the optimum concentration were investigated, and the optimum operating temperature of the composite coating was determined. The following conclusions are drawn: 1. The friction coefficient of Ni-WS2 composite coating is better than that of Ni-MoS_2 composite coating at room temperature under the condition of GCr1520 N load on the dual part, and the friction coefficient of Ni-WS2 composite coating is better than that of Ni-MoS_2 composite coating at room temperature. But the lubricating effect was better than that of pure nickel coating. The lowest room temperature friction coefficient of Ni-30 g / L MoS_2 composite coating was 0.02 0. 03% Ni-30 g / L WS_2 composite coating at 30 g / L at 30 g / L, the lowest room temperature friction coefficient was 0. 01% 0. 02.2 under high temperature friction condition. The optimum service temperature of Ni-WS2 composite coating is higher than that of Ni-MoS_2 composite coating. The friction coefficient of Ni-MoS2 composite coating is close to 0.15 at 400 鈩，

本文編號：1700552