本文選題：高壓隔離開關(guān) + 銀鍍層��； 參考：《南昌航空大學(xué)》2015年碩士論文

【摘要】：戶外高壓隔離開關(guān)是電力系統(tǒng)中最重要的電氣設(shè)備之一,其電接觸部位常常由于過熱而失效,每年都造成大量的經(jīng)濟(jì)損失。本文以戶外高壓隔離開關(guān)觸頭為應(yīng)用背景,采用電沉積法制備了銀鍍層與銀石墨自潤滑復(fù)合鍍層,使用顯微觀察、掃描電子顯微鏡(SEM)、場發(fā)射掃描電鏡(FESEM)、X射線衍射(XRD)、能譜儀(EDS)、熱重/差熱分析(TG/DTA)、紅外碳硫分析、中性鹽霧試驗(yàn)、Tafel曲線、摩擦磨損試驗(yàn)、掃描磨損輪廓等測試手段與表征方法,對銀鍍層與復(fù)合鍍層的形貌、成分、生長機(jī)制、結(jié)合力、耐蝕性、抗硫性、熱穩(wěn)定性、耐磨性及磨損機(jī)制等進(jìn)行了研究。研究表明,由于石墨的尖端放電效應(yīng)和電極表面擴(kuò)散層的存在,銀的生長受限,呈現(xiàn)出有擇優(yōu)取向的線性連結(jié)生長方式,使得復(fù)合鍍層孔隙率比銀鍍層高。根據(jù)GB/T 5270-2005,純銀鍍層與復(fù)合鍍層斷口不起皮、不脫落,結(jié)合力良好;根據(jù)GB/T 6461-2002,兩種鍍層表面均未出現(xiàn)腐蝕點(diǎn)與腐蝕坑,耐蝕性達(dá)到中性鹽霧試驗(yàn)十級標(biāo)準(zhǔn);根據(jù)QJ485-1988,兩種鍍層在Na2S溶液中浸泡半小時不變色,抗變色能力達(dá)到航空標(biāo)準(zhǔn)。純銀鍍層在室溫~120℃表面發(fā)生氧化形成Ag2O,120℃~664℃銀鍍層氧化膜持續(xù)分解;室溫~48℃為復(fù)合鍍層的氣體脫附階段,48℃復(fù)合鍍層中的水分開始蒸發(fā),130℃時蒸發(fā)完全,160℃~521℃為石墨層間化合物的分解階段,521℃~740℃石墨的碳骨架開始氧化。磨損試驗(yàn)表明,260 g載荷下純銀鍍層的摩擦系數(shù)為0.342,復(fù)合鍍層摩擦系數(shù)為0.075。復(fù)合鍍層在小于260 g載荷下以磨粒磨損為主;隨著載荷從260 g逐漸增加至860 g,疲勞磨損剝層開始出現(xiàn),并且疲勞磨損逐漸成為主要磨損機(jī)制,同時磨粒磨損減少,復(fù)合鍍層的摩擦系數(shù)始終保持在0.1以下。隨著沉積電流密度的增大,復(fù)合鍍層中石墨含量增多,在1 M H2SO4溶液中的自腐蝕電流密度增大,耐磨性能先增強(qiáng)后減弱,0.3 A/dm2電流密度下鍍層耐磨性最好。隨著攪拌速度的增大,復(fù)合鍍層中石墨的含量增大后減小,在1 M H2SO4溶液中的自腐蝕電流密度先增大后減小,耐磨性能減弱,420 r/min攪拌速度下的磨損率最低,為8.13×10-14 m-3/N·m。
[Abstract]:Outdoor high voltage isolating switch is one of the most important electrical equipments in power system. Its electrical contact part often fails because of overheating, which causes a lot of economic losses every year. In this paper, the silver coating and silver graphite self-lubricating composite coating were prepared by electrodeposition under the background of outdoor high-voltage isolating switch contacts. Scanning electron microscope (SEM), field emission scanning electron microscope (SEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS), thermogravimetric / differential thermal analysis (TGR), infrared carbon-sulfur analysis, neutral salt spray test, friction and wear test, scanning and wear profile, etc. The morphology, composition, growth mechanism, adhesion, corrosion resistance, sulfur resistance, thermal stability, wear resistance and wear mechanism of silver and composite coatings were studied. The results show that the growth of silver is limited due to the tip discharge effect of graphite and the existence of diffusion layer on the electrode surface. According to GB/T 5270-2005, the fracture surface of pure silver coating and composite coating is not peeled, does not fall off, and the adhesion is good, according to GB/T 6461-2002, there are no corrosion points and corrosion pits on the surface of the two coatings, and the corrosion resistance reaches the 10th grade standard of neutral salt spray test. According to QJ485-1988, the two coatings were immersed in Na2S solution for half an hour without discoloration, and the anti-discoloration ability reached the aviation standard. The oxidation of pure silver coating on the surface of silver deposit at room temperature of 120 鈩，

本文編號：1950305