六钛酸钾晶须及多维增强环保刹车片的制备与表征

发布时间：2018-01-12 23:08

  本文关键词：六钛酸钾晶须及多维增强环保刹车片的制备与表征　出处：《合肥工业大学》2016年硕士论文　论文类型：学位论文

  更多相关文章： 环氧化物 溶胶凝胶 无铜少金属 摩擦磨损 摩擦材料

【摘要】：近些年,随着人们环保意识的增强,寻找一种材料能替代石棉纤维作为刹车片的增强材料成为当务之急,六钛酸钾晶须以其优异的力学性能和独特的化学性质,已经在复合增强材料、摩擦材料、触媒载体等诸多领域发挥很重要作用。尤其当六钛酸钾晶须的合成取得了较大的突破后,六钛酸钾晶须被认为是石棉纤维的最佳替代品。但大规模的工业生产主要以烧结法为主,有着能耗大,产品形貌不均匀等缺点。因此,改进生产工艺,以低能耗方法制备出高长径比的适合摩擦材料、性能优良的六钛酸钾晶须是人们研究领域的重要课题。本文以溶胶凝胶法与烧结法结合制备六钛酸钾晶须,以设计无铜少金属无石棉有机型绿色环保刹车片配方为两个研究方向,取得如下工作成果：1.环氧丙烷作为胶凝剂的溶胶凝胶法合成六钛酸钾晶须的过程,以TiCl4和CH3COOK原料,可降低其煅烧温度,增加晶须长径比,结果表明以钾钛比为1：3,煅烧温度为1000℃C保温5h,合成的六钛酸钾晶须平均长度在4 μ m,长径比约为12,晶体的结晶性好,形貌均匀。2.六钛酸钾晶须与其它纤维协同增强配方设计,讨论不同钛酸钾晶须和芳纶的混杂对刹车片的力学性能和摩擦磨损性能的影响。利用金属硫化物和摩擦性能调节剂和热导率高的纤维可以部分或完全取代铜在摩擦材料中的作用。在钛酸钾晶须和芳纶比为1：4加入刹车片配方中,定速摩擦试验机在100～350℃温度范围内,摩擦系数在0.33～0.43小范围内波动,磨损率平均值最低,台架试验结果表明,该配方的刹车片抗热衰退性和恢复性能良好。3.多维复合增强NAO刹车片的制备和摩擦磨损性能研究,构体是由二维鳞片石墨为网络骨架,交叉、互连的钛酸钾晶须为连接补强体,零维空心微珠等填入其结构空隙,形成稳定的三维空间网络结构；增强了摩擦体系稳定性,赋予摩擦材料较高且较稳定的摩擦磨损性能。以溶胶凝胶法和烧结法结合制备出的六钛酸钾晶须不仅大大降低了六钛酸钾的烧结温度,同时形貌均匀,分散性良好；以六钛酸钾晶须为增强材料制备出的刹车片,不仅提高了刹车片高温耐磨性能同时稳定了高温摩擦系数,避免了高温摩擦热衰退。提高了刹车片在制动过程中的安全性。
[Abstract]:In recent years, with the increasing awareness of environmental protection, it has become an urgent matter to find a material that can replace asbestos fiber as reinforcement material for brake pads. Potassium hexatitanate whiskers have excellent mechanical properties and unique chemical properties. It has played an important role in many fields, such as composite reinforcement materials, friction materials, catalyst carriers and so on, especially when the synthesis of potassium hexatitanate whiskers has made a great breakthrough. Potassium hexatitanate whisker is considered to be the best substitute for asbestos fiber, but the large scale industrial production is mainly by sintering process, which has the disadvantages of high energy consumption and uneven product appearance. Therefore, the production process has been improved. The suitable friction materials with high aspect ratio and high aspect ratio were prepared by low energy consumption. Potassium hexatitanate whisker with excellent properties is an important subject in the research field. In this paper, potassium hexatitanate whisker is prepared by sol-gel method and sintering method. The formulation of green environmental protection brake with no copper, little metal and no asbestos was studied in two directions. The following results were obtained: 1. The process of synthesizing potassium hexatitanate whisker by sol-gel method with propylene oxide as gelling agent. The calcination temperature of TiCl4 and CH3COOK can be reduced and the aspect ratio of whisker can be increased. The results show that the ratio of potassium to titanium is 1: 3, and the calcination temperature is 1000 鈩，

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