PTFE颗粒的表面改性及其在复合镀层中的应用

发布时间：2018-01-06 05:04

  本文关键词：PTFE颗粒的表面改性及其在复合镀层中的应用　出处：《南京航空航天大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 聚四氟乙烯颗粒 预处理工艺 表面改性 包覆 化学复合镀

【摘要】：在工业生产中,设备磨损带来的损耗占到了生产成本和能源消耗的很大一部分,通过制备具有良好摩擦磨损性能的复合镀层来改善设备的耐磨减摩性能、减少环境污染、提高能源利用率,在未来的工业领域具有良好的应用前景。聚四氟乙烯(Polytetrafluoroethylene,简写为PTFE)颗粒本身具有良好的润滑性能,但其亲水性能较差,难以在水基溶液和镀液中充分分散,不易与基质金属发生共沉积,因此较难直接应用到化学复合镀中制备镀层。本文采用预处理方法对PTFE颗粒进行表面预处理,初步改善其亲水性能和表面活性,在此基础上,通过非均匀形核法在其表面包覆Al(OH)3,充分改善PTFE颗粒在镀液中的分散性能。将表面改性后的PTFE颗粒应用到化学复合镀中,制备出具有良好摩擦磨损性能的Ni-P-PTFE镀层。本文主要的研究内容及结果如下:(1)探索了PTFE颗粒的预处理工艺,研究了预处理液浓度和预处理时间对PTFE颗粒表面形貌的影响,探讨了预处理工艺对PTFE颗粒后期包覆效果的影响机制。结果表明:PTFE预处理后,颗粒表面凸起增多且密集,利于后期包覆的进行,最佳的预处理工艺为:预处理液浓度为0.4mol/L,预处理时间为1.5min。(2)探索了PTFE颗粒的表面沉积包覆工艺,分析各包覆因素对包覆效果的影响情况,探讨了各因素对颗粒包覆率、亲水性能、Zeta电位等的影响机制。结果表明:包覆后PTFE颗粒亲水性能的得到明显改善,Zeta电位(Zeta potential,电动电位)显著提高。p H4.5条件下,最佳包覆工艺参数为PTFE浓度8g/L、缓冲液浓度0.10mol/L、表面活性剂FC134(Trimethyl-1-propanaminium iodide,简写为FC134,全氟辛基季胺磺酰胺丙基三甲基铵碘化物)浓度0.4g/L、补充液Al(NO3)3浓度0.08mol/L。(3)将表面改性后PTFE颗粒应用到化学复合镀中,制备了Ni-P-caoted PTFE复合镀层,并对其性能进行了表征。结果表明:加入PTFE后,镀层摩擦系数显著下降,同时降低镀层的显微硬度,耐磨性下降;最佳镀覆参数为PTFE颗粒含量4g/L,FC134含量0.5g/L,搅拌转速应350r/min,热处理温度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，

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