發(fā)布時(shí)間：2018-01-12 23:08

  本文關(guān)鍵詞：六鈦酸鉀晶須及多維增強(qiáng)環(huán)保剎車片的制備與表征　出處：《合肥工業(yè)大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 環(huán)氧化物 溶膠凝膠 無(wú)銅少金屬 摩擦磨損 摩擦材料

【摘要】：近些年,隨著人們環(huán)保意識(shí)的增強(qiáng),尋找一種材料能替代石棉纖維作為剎車片的增強(qiáng)材料成為當(dāng)務(wù)之急,六鈦酸鉀晶須以其優(yōu)異的力學(xué)性能和獨(dú)特的化學(xué)性質(zhì),已經(jīng)在復(fù)合增強(qiáng)材料、摩擦材料、觸媒載體等諸多領(lǐng)域發(fā)揮很重要作用。尤其當(dāng)六鈦酸鉀晶須的合成取得了較大的突破后,六鈦酸鉀晶須被認(rèn)為是石棉纖維的最佳替代品。但大規(guī)模的工業(yè)生產(chǎn)主要以燒結(jié)法為主,有著能耗大,產(chǎn)品形貌不均勻等缺點(diǎn)。因此,改進(jìn)生產(chǎn)工藝,以低能耗方法制備出高長(zhǎng)徑比的適合摩擦材料、性能優(yōu)良的六鈦酸鉀晶須是人們研究領(lǐng)域的重要課題。本文以溶膠凝膠法與燒結(jié)法結(jié)合制備六鈦酸鉀晶須,以設(shè)計(jì)無(wú)銅少金屬無(wú)石棉有機(jī)型綠色環(huán)保剎車片配方為兩個(gè)研究方向,取得如下工作成果：1.環(huán)氧丙烷作為膠凝劑的溶膠凝膠法合成六鈦酸鉀晶須的過(guò)程,以TiCl4和CH3COOK原料,可降低其煅燒溫度,增加晶須長(zhǎng)徑比,結(jié)果表明以鉀鈦比為1：3,煅燒溫度為1000℃C保溫5h,合成的六鈦酸鉀晶須平均長(zhǎng)度在4 μ m,長(zhǎng)徑比約為12,晶體的結(jié)晶性好,形貌均勻。2.六鈦酸鉀晶須與其它纖維協(xié)同增強(qiáng)配方設(shè)計(jì),討論不同鈦酸鉀晶須和芳綸的混雜對(duì)剎車片的力學(xué)性能和摩擦磨損性能的影響。利用金屬硫化物和摩擦性能調(diào)節(jié)劑和熱導(dǎo)率高的纖維可以部分或完全取代銅在摩擦材料中的作用。在鈦酸鉀晶須和芳綸比為1：4加入剎車片配方中,定速摩擦試驗(yàn)機(jī)在100～350℃溫度范圍內(nèi),摩擦系數(shù)在0.33～0.43小范圍內(nèi)波動(dòng),磨損率平均值最低,臺(tái)架試驗(yàn)結(jié)果表明,該配方的剎車片抗熱衰退性和恢復(fù)性能良好。3.多維復(fù)合增強(qiáng)NAO剎車片的制備和摩擦磨損性能研究,構(gòu)體是由二維鱗片石墨為網(wǎng)絡(luò)骨架,交叉、互連的鈦酸鉀晶須為連接補(bǔ)強(qiáng)體,零維空心微珠等填入其結(jié)構(gòu)空隙,形成穩(wěn)定的三維空間網(wǎng)絡(luò)結(jié)構(gòu)；增強(qiáng)了摩擦體系穩(wěn)定性,賦予摩擦材料較高且較穩(wěn)定的摩擦磨損性能。以溶膠凝膠法和燒結(jié)法結(jié)合制備出的六鈦酸鉀晶須不僅大大降低了六鈦酸鉀的燒結(jié)溫度,同時(shí)形貌均勻,分散性良好；以六鈦酸鉀晶須為增強(qiáng)材料制備出的剎車片,不僅提高了剎車片高溫耐磨性能同時(shí)穩(wěn)定了高溫摩擦系數(shù),避免了高溫摩擦熱衰退。提高了剎車片在制動(dòng)過(guò)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，

本文編號(hào)：1416389