發(fā)布時間：2018-06-22 02:12

  本文選題：電泳沉積 + 電沉積　； 參考：《南京航空航天大學(xué)》2015年碩士論文

【摘要】：將PTFE(聚四氟乙烯)顆粒加入到Ni鍍層中制備出Ni-PTFE復(fù)合鍍層,可以改善純Ni鍍層的摩擦學(xué)性能,從而獲得具有良好的自潤滑特性的鍍層。以往的研究中,Ni-PTFE自潤滑復(fù)合鍍層通常采用復(fù)合共沉積和化學(xué)復(fù)合鍍工藝進(jìn)行制備。由復(fù)合共沉積工藝制備的自潤滑復(fù)合鍍層顆粒含量低,很難完全發(fā)揮顆粒的自潤滑作用;由化學(xué)復(fù)合鍍工藝制備自潤滑復(fù)合鍍層,鍍液溫度較高,并且容易發(fā)生分解,很不穩(wěn)定,制備出的復(fù)合鍍層也會存在應(yīng)力裂紋的問題。為了提高復(fù)合鍍層中PTFE的顆粒含量,改善鍍層性能,本文采用電泳沉積和電沉積兩步法進(jìn)行了Ni-PTFE復(fù)合鍍層的制備。該工藝首先在基體表面電泳沉積一層PTFE沉積層,然后通過電沉積將基質(zhì)金屬Ni嵌入到PTFE層的孔隙中,從而形成Ni-PTFE復(fù)合鍍層。本文主要工作及結(jié)論如下:(1)開展了PTFE顆粒(5μm)的電泳沉積研究。探討了電泳沉積的參數(shù):電泳電壓、電泳時間、PTFE濃度和Mg Cl2·6H2O濃度對PTFE電泳沉積的影響。研究發(fā)現(xiàn),電泳時間、電泳電壓和PTFE濃度均與電泳沉積量呈正比關(guān)系,但是電泳時間的延長會降低電泳沉積的效率并且影響電泳液的穩(wěn)定性。Mg Cl2·6H2O濃度對電泳沉積層分布的致密度有重要影響。初期優(yōu)化后的的電泳沉積工藝能夠制備出均勻、致密的PTFE電泳沉積層。(2)通過正交試驗(yàn)對電泳-電沉積法制備Ni-PTFE復(fù)合鍍層的工藝進(jìn)行了研究,同時分析和總結(jié)了各工藝參數(shù)對復(fù)合鍍層的性能的影響規(guī)律。研究發(fā)現(xiàn),電泳-電沉積工藝能夠顯著的提高復(fù)合鍍層中PTFE含量,該工藝能夠制備出PTFE復(fù)合量高達(dá)63.4vol.%的Ni-PTFE復(fù)合鍍層。電沉積陰極電流密度對復(fù)合鍍層的鍍速影響最大,同時電沉積陰極電流密度對復(fù)合鍍層的厚度和沉積效率有重要影響。電泳時間對復(fù)合鍍層的表面粗糙度和PTFE的復(fù)合量、顯微硬度影響最大,電泳液中PTFE濃度的增加也會提高復(fù)合鍍層中PTFE的復(fù)合量,但是此時PTFE的團(tuán)聚現(xiàn)象較為嚴(yán)重。(3)研究了PTFE的復(fù)合量對復(fù)合鍍層的摩擦學(xué)性能的影響。研究發(fā)現(xiàn),隨著復(fù)合鍍層中PTFE粒子含量的增加,其自潤滑性能得到了充分的發(fā)揮,復(fù)合鍍層的摩擦學(xué)性能得到很大的改善。在復(fù)合鍍層中PTFE體積分?jǐn)?shù)為44%時,Ni-PTFE復(fù)合鍍層具有最佳的減摩效果,此時的摩擦系數(shù)為0.067。當(dāng)PTFE體積分?jǐn)?shù)為63.4%時,Ni-PTFE復(fù)合鍍層耐磨性最好。(4)采用電泳-電沉積法對制備Ni-PTFE-Al2O3復(fù)合鍍層的工藝進(jìn)行了探索,研究發(fā)現(xiàn),相對于連續(xù)電泳沉積法而言,電泳共沉積法能夠制備出較為均勻的電泳沉積層。同時,對制備出的Ni-PTFE-Al2O3復(fù)合鍍層的耐磨性能與Ni-PTFE和Ni-Al2O3進(jìn)行了對比研究。Ni-Al2O3復(fù)合鍍層的耐磨性能最佳,Ni-PTFE-Al2O3復(fù)合鍍層的耐磨性與鍍層中的Al2O3顆粒和PTFE復(fù)合量密切相關(guān),當(dāng)Al2O3復(fù)合量較少時,其耐磨性比Ni-PTFE復(fù)合鍍層差;當(dāng)Al2O3復(fù)合量較高時,其耐磨性能要強(qiáng)于Ni-PTFE復(fù)合鍍層。
[Abstract]:Ni-PTFE composite coating was prepared by adding PTFE (PTFE) particles into Ni coating. The tribological properties of pure Ni coating were improved and the coating with good self-lubricating properties was obtained. In the past, Ni-PTFE self-lubricating composite coatings were prepared by co-deposition and electroless composite plating. The self-lubricating composite coating prepared by the composite co-deposition process has low particle content and is difficult to give full play to the self-lubricating effect of the particles. The self-lubricating composite coating prepared by the electroless composite plating process has a higher bath temperature and is easy to decompose. Because of the instability, the composite coating also has the problem of stress crack. In order to improve the content of PTFE particles and the properties of composite coatings, electrophoretic deposition and electrodeposition were used to prepare Ni-PTFE composite coatings. Firstly, a layer of PTFE was deposited on the substrate surface by electrophoretic deposition, and then Ni matrix was embedded into the pores of the PTFE layer by electrodeposition to form Ni-PTFE composite coating. The main work and conclusions are as follows: (1) Electrophoretic deposition of PTFE particles (5 渭 m) was carried out. The effects of electrophoretic deposition parameters, such as electrophoretic voltage, electrophoretic time, PTFE concentration and MgCl _ 2 路6H _ 2O concentration, on the electrophoretic deposition of PTFE were investigated. It was found that the electrophoretic time, electrophoretic voltage and PTFE concentration were proportional to the amount of electrophoretic deposition. However, the increase of electrophoretic time will decrease the efficiency of electrophoretic deposition and affect the stability of the electrophoretic solution. The concentration of MgCl _ 2 路6H _ 2O has an important effect on the density of the electrophoretic deposit. The initial optimized electrophoretic deposition process can produce uniform and dense PTFE electrophoretic deposits. (2) the electrophoretic electrodeposition method was used to prepare Ni-PTFE composite coatings. At the same time, the influence of various process parameters on the properties of composite coating was analyzed and summarized. It was found that the electrophoretic electrodeposition process could significantly increase the content of PTFE in the composite coating, and the Ni-PTFE composite coating with 63.4 vol.% PTFE composite coating could be prepared by this process. The cathodic current density of electrodeposition has the greatest influence on the plating rate of composite coating, and the cathodic current density of electrodeposition has an important effect on the thickness and deposition efficiency of composite coating. The effect of electrophoretic time on the surface roughness and the composite amount of PTFE and microhardness of the composite coating was the greatest, and the increase of PTFE concentration in the electrophoretic solution also increased the composite amount of PTFE in the composite coating. However, the agglomeration of PTFE is serious. (3) the effect of PTFE composition on the tribological properties of the composite coating is studied. It is found that with the increase of PTFE particle content, the self-lubricating property of the composite coating is fully developed, and the tribological properties of the composite coating are greatly improved. When the volume fraction of PTFE is 44, Ni-PTFE composite coating has the best antifriction effect, and the friction coefficient is 0.067. When the volume fraction of PTFE is 63.4, the wear resistance of Ni-PTFE composite coating is the best. (4) the electrophoretic electrodeposition method is used to investigate the preparation process of Ni-PTFE-Al _ 2O _ 3 composite coating, and it is found that compared with the continuous electrophoretic deposition method, A more uniform electrophoretic deposition layer can be prepared by electrophoretic codeposition. At the same time, the wear resistance of Ni-PTFE-Al _ 2O _ 3 composite coating was compared with that of Ni-PTFE and Ni-Al _ 2O _ 3 composite coating. The wear resistance of Ni-PTFE-Al _ 2O _ 3 composite coating was closely related to the Al _ 2O _ 3 particle and PTFE composite content in the coating. The wear resistance of Ni-PTFE composite coating is lower than that of Ni-PTFE composite coating, and the wear resistance of Al _ 2O _ 3 composite coating is better than that of Ni-PTFE composite coating when the amount of Al _ 2O _ 3 composite coating is higher.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB306

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