本文選題：TC4鈦合金 + 化學(xué)復(fù)合鍍　； 參考：《東北大學(xué)》2011年碩士論文

【摘要】：鈦合金具有比強(qiáng)度高、熱強(qiáng)性好、耐腐蝕等優(yōu)點(diǎn),已成為航空、航天、火箭、導(dǎo)彈、艦艇及能源化工等國防和民用工業(yè)部門的重要結(jié)構(gòu)材料,發(fā)展前景十分廣闊。其中TC4(Ti-6A1-4V)鈦合金用途最為廣泛,用量占鈦合金總量的一半以上。但鈦合金硬度低,耐磨性能較差,這限制了其在實(shí)際中的應(yīng)用。為了克服鈦合金摩擦磨損性能的不足,鈦合金表面改性技術(shù)已成為該領(lǐng)域內(nèi)一個(gè)新的研究熱點(diǎn)。 本文分別通過Ni-P-PTFE化學(xué)復(fù)合鍍方法、微弧氧化-復(fù)合PTFE涂膜方法在TC4鈦合金的表面成功的制備出具有耐磨減摩性能的自潤滑膜。同時(shí)分別對這兩種方法進(jìn)行了系統(tǒng)地研究和探討。利用XRD、SEM、EDS等手段對自潤滑膜的微觀形貌及相成分進(jìn)行了分析,并采用摩擦磨損試驗(yàn)機(jī)測試了其摩擦磨損性能。 研究了Ni-P-PTFE化學(xué)復(fù)合鍍工藝,得至PTFE乳液濃度、表面活性劑濃度、施鍍溫度、pH值等參數(shù)對復(fù)合鍍層中PTFE含量的影響規(guī)律；鍍層中PTFE的含量是影響復(fù)合鍍層摩擦磨損性能的關(guān)鍵因素。實(shí)驗(yàn)結(jié)果表明：化學(xué)鍍Ni-P鍍層和化學(xué)復(fù)合鍍Ni-P-PTFE鍍層都可以有效地改善鈦合金的摩擦磨損性能,Ni-P-PTFE復(fù)合鍍層的效果更為明顯。當(dāng)復(fù)合鍍層中PTFE體積百分含量約為20.39v%時(shí),其摩擦系數(shù)降至小于0.2,耐磨性能良好；隨著鍍層中PTFE含量繼續(xù)增加,其摩擦系數(shù)會(huì)繼續(xù)下降,當(dāng)PTFE體積百分含量約為26.4v%時(shí),其摩擦系數(shù)降至約0.13,但此時(shí)鍍層結(jié)合力差,導(dǎo)致其耐磨性能降低。 研究微弧氧化-復(fù)合PTFE涂膜處理工藝,討論分析了微弧氧化電壓、氧化時(shí)間對多孔膜形貌及相成分的影響,以及微弧氧化-復(fù)合PTFE涂膜的摩擦磨損性能。研究結(jié)果表明,鈦合金微弧氧化-復(fù)合PTFE涂膜后,PTFE粒子較均勻占據(jù)Ti02孔徑內(nèi),復(fù)合膜的摩擦系數(shù)約為0.12,同時(shí)具有良好的耐磨性能。
[Abstract]:Titanium alloy has become an important structural material of national defense and civil industry such as aviation, aerospace, rocket, missile, ship and energy and chemical industry, with high specific strength, good thermal strength, corrosion resistance and so on.Among them, TC _ 4 Ti _ 6A _ (1-4) Ti alloy is the most widely used, accounting for more than half of the total amount of titanium alloy.However, titanium alloy has low hardness and poor wear resistance, which limits its application in practice.In order to overcome the deficiency of friction and wear performance of titanium alloy, surface modification technology of titanium alloy has become a new research hotspot in this field.In this paper, self-lubricating films with wear-resistant and friction-reducing properties were successfully prepared on the surface of TC4 titanium alloy by Ni-P-PTFE electroless composite plating and micro-arc oxidation-composite PTFE coating method.At the same time, the two methods are systematically studied and discussed.The micro-morphology and phase composition of the self-lubricating film were analyzed by means of XRDX SEMZEDS and the friction and wear properties of the film were tested by friction and wear tester.The effects of PTFE emulsion concentration, surfactant concentration, plating temperature and pH value on the content of PTFE in the composite coating were studied.The content of PTFE in the coating is a key factor affecting the friction and wear properties of the composite coating.The experimental results show that both electroless Ni-P coating and electroless composite Ni-P-PTFE coating can effectively improve the friction and wear properties of titanium alloy and the effect of Ni-P-PTFE composite coating is more obvious than that of Ni-P-PTFE composite coating.When the content of PTFE in the composite coating is about 20.39 v%, the friction coefficient of the composite coating decreases to less than 0.2, and the friction coefficient will continue to decrease with the increase of the content of PTFE in the coating, and when the volume percentage of PTFE is about 26.4v%, the friction coefficient of the composite coating will continue to decrease with the increase of the content of PTFE in the coating.The friction coefficient was reduced to about 0.13, but the adhesion of the coating was poor, which resulted in the decrease of wear resistance.The treatment process of micro-arc oxidation-composite PTFE film was studied. The effects of micro-arc oxidation voltage and oxidation time on the morphology and phase composition of porous film and the friction and wear properties of micro-arc oxidation-composite PTFE film were discussed.The results show that the particles of titanium alloy after micro-arc oxidation and composite PTFE coating occupy the pore diameter of Ti02 more evenly, and the friction coefficient of the composite film is about 0.12, and the composite film has good wear resistance at the same time.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH117;TG174.4

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