本文關(guān)鍵詞：PTFE顆粒的表面改性及其在復(fù)合鍍層中的應(yīng)用　出處：《南京航空航天大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 聚四氟乙烯顆粒 預(yù)處理工藝 表面改性 包覆 化學(xué)復(fù)合鍍

【摘要】：在工業(yè)生產(chǎn)中,設(shè)備磨損帶來的損耗占到了生產(chǎn)成本和能源消耗的很大一部分,通過制備具有良好摩擦磨損性能的復(fù)合鍍層來改善設(shè)備的耐磨減摩性能、減少環(huán)境污染、提高能源利用率,在未來的工業(yè)領(lǐng)域具有良好的應(yīng)用前景。聚四氟乙烯(Polytetrafluoroethylene,簡寫為PTFE)顆粒本身具有良好的潤滑性能,但其親水性能較差,難以在水基溶液和鍍液中充分分散,不易與基質(zhì)金屬發(fā)生共沉積,因此較難直接應(yīng)用到化學(xué)復(fù)合鍍中制備鍍層。本文采用預(yù)處理方法對PTFE顆粒進(jìn)行表面預(yù)處理,初步改善其親水性能和表面活性,在此基礎(chǔ)上,通過非均勻形核法在其表面包覆Al(OH)3,充分改善PTFE顆粒在鍍液中的分散性能。將表面改性后的PTFE顆粒應(yīng)用到化學(xué)復(fù)合鍍中,制備出具有良好摩擦磨損性能的Ni-P-PTFE鍍層。本文主要的研究內(nèi)容及結(jié)果如下:(1)探索了PTFE顆粒的預(yù)處理工藝,研究了預(yù)處理液濃度和預(yù)處理時間對PTFE顆粒表面形貌的影響,探討了預(yù)處理工藝對PTFE顆粒后期包覆效果的影響機(jī)制。結(jié)果表明:PTFE預(yù)處理后,顆粒表面凸起增多且密集,利于后期包覆的進(jìn)行,最佳的預(yù)處理工藝為:預(yù)處理液濃度為0.4mol/L,預(yù)處理時間為1.5min。(2)探索了PTFE顆粒的表面沉積包覆工藝,分析各包覆因素對包覆效果的影響情況,探討了各因素對顆粒包覆率、親水性能、Zeta電位等的影響機(jī)制。結(jié)果表明:包覆后PTFE顆粒親水性能的得到明顯改善,Zeta電位(Zeta potential,電動電位)顯著提高。p H4.5條件下,最佳包覆工藝參數(shù)為PTFE濃度8g/L、緩沖液濃度0.10mol/L、表面活性劑FC134(Trimethyl-1-propanaminium iodide,簡寫為FC134,全氟辛基季胺磺酰胺丙基三甲基銨碘化物)濃度0.4g/L、補(bǔ)充液Al(NO3)3濃度0.08mol/L。(3)將表面改性后PTFE顆粒應(yīng)用到化學(xué)復(fù)合鍍中,制備了Ni-P-caoted PTFE復(fù)合鍍層,并對其性能進(jìn)行了表征。結(jié)果表明:加入PTFE后,鍍層摩擦系數(shù)顯著下降,同時降低鍍層的顯微硬度,耐磨性下降;最佳鍍覆參數(shù)為PTFE顆粒含量4g/L,FC134含量0.5g/L,攪拌轉(zhuǎn)速應(yīng)350r/min,熱處理溫度260℃。
[Abstract]:In the industrial production, the wear loss of the equipment accounts for a large part of the production cost and energy consumption, through the preparation of a composite coating with good friction and wear performance to improve the wear and friction performance of the equipment. To reduce environmental pollution and improve energy efficiency, it has a good application prospect in the future industrial field. Polytetrafluoroethylene tetrafluoroethylene. PTFE-based particles have good lubricity, but their hydrophilicity is poor, it is difficult to disperse in aqueous solution and plating solution, and it is not easy to codeposit with matrix metal. Therefore, it is difficult to directly apply to electroless composite plating to prepare the coating. In this paper, the surface pretreatment of PTFE particles is used to improve the hydrophilicity and surface activity. The dispersion property of PTFE particles in plating solution was improved by non-uniform nucleation method. The surface modified PTFE particles were applied to electroless composite plating. Ni-P-PTFE coatings with good friction and wear properties were prepared. The main contents and results of this paper are as follows: 1) the pretreatment process of PTFE particles has been explored. The effects of pretreatment solution concentration and pretreatment time on the surface morphology of PTFE particles were studied. The effect of pretreatment process on the late coating effect of PTFE particles was discussed. The results showed that the surface protrusions of PTFE particles were increased and dense after pretreatment, which was beneficial to the later coating. The optimal pretreatment process was: the concentration of pretreatment solution was 0.4mol / L and the pretreatment time was 1.5min. 2) the surface deposition and coating process of PTFE particles was explored. The influence of each coating factor on the coating effect was analyzed, and the effect of each factor on the particle coating rate and hydrophilicity was discussed. The results showed that the hydrophilicity of PTFE particles was improved obviously after the coating, and the Zeta potential was obviously improved. When electrokinetic potential was significantly increased, the optimal coating parameters were PTFE concentration of 8g / L and buffer concentration of 0.10mol / L. Surfactant FC134(Trimethyl-1-propanaminium iodide, abbreviated as FC134. The concentration of perfluorooctane quaternary amine sulfonamide propyltrimethylammonium iodide) was 0.4g / L. The surface modified PTFE particles were prepared by adding 0.08mol / L 路L ~ (-3) Al(NO3)3 into electroless composite plating. The Ni-P-caoted PTFE composite coating was prepared and its properties were characterized. The results showed that the friction coefficient of the coating decreased significantly with the addition of PTFE. At the same time, the microhardness and wear resistance of the coating were decreased. The optimum coating parameters are as follows: the content of PTFE particles is 4 g / L, the content of FC134 is 0.5 g / L, the stirring speed should be 350 r / min, and the heat treatment temperature is 260 鈩，

本文編號：1386394