本文關(guān)鍵詞：碳布增強(qiáng)濕式摩擦材料摩擦學(xué)性能及機(jī)理研究　出處：《陜西科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 濕式摩擦材料 碳布增強(qiáng) 摩擦學(xué)性能 水熱氧化 納米SiO2

【摘要】：樹脂基復(fù)合材料作為濕式摩擦材料的重要組成廣泛應(yīng)用于汽車自動變速器、同步器、差速器以及扭矩管理器等方面,隨著技術(shù)的不斷進(jìn)步,高鐵、地鐵、大型工程機(jī)械、深海石油鉆井等的傳動/制動系統(tǒng)對樹脂基復(fù)合材料的工況適應(yīng)性、傳動平穩(wěn)性以及使用壽命等方面提出了更為苛刻的要求。本文以碳布為增強(qiáng)體,研究了不同改性酚醛和不同對偶材料對碳布增強(qiáng)濕式摩擦材料摩擦學(xué)性能的影響,重點研究了水熱氧化法改性碳布和微波水熱法沉積納米Si O2改性碳布對摩擦材料的影響。(1)采用硼改性、腰果殼油改性和丁腈橡膠改性酚醛樹脂制備了三種碳布增強(qiáng)濕式摩擦材料,并采用熱分析儀分析了樣品的熱降解特性,濕式摩擦試驗機(jī)測試了樣品的摩擦磨損性能,掃描電子顯微鏡分析了樣品的磨損機(jī)制。結(jié)果表明:由硼改性酚醛樹脂制備的碳布增強(qiáng)濕式摩擦材料表現(xiàn)出良好的耐熱性,更高的摩擦系數(shù),優(yōu)異的摩擦穩(wěn)定性和較低的磨損率。(2)采用水熱氧化法在不同水熱溫度下用濃硝酸處理碳布,詳細(xì)研究了水熱溫度對摩擦學(xué)性能的影響規(guī)律。結(jié)果表明:經(jīng)不同水熱氧化溫度改性后的碳布表面形貌發(fā)生變化,同時出現(xiàn)了大量的羰基基團(tuán),碳纖維石墨化程度有所提高,碳布表面親水性能得到了明顯的改善,有效提高了碳布與樹脂的粘結(jié)強(qiáng)度。水熱氧化改性碳布增強(qiáng)濕式摩擦材料在100-120℃表現(xiàn)出最佳的摩擦磨損性能,磨損量分別降低到了未改性樣品的34.3%和44.7%。(3)在水熱100℃條件下氧化處理碳布的基礎(chǔ)上,采用微波水熱法,在不同微波水熱溫度、硅溶膠濃度和微波水熱時間下引入納米Si O2顆粒,系統(tǒng)研究納米Si O2對碳布增強(qiáng)濕式摩擦材料的影響。結(jié)果表明:納米Si O2顆粒有效沉積到了碳纖維表面,增加了碳纖維表面的粗糙度和碳布親水性能,實現(xiàn)了復(fù)合材料的多尺度增強(qiáng)。微波水熱200℃、硅溶膠濃度9%和微波水熱60min條件下沉積納米Si O2改性碳布增強(qiáng)濕式摩擦材料的摩擦學(xué)性能最好,動摩擦系數(shù)和摩擦穩(wěn)定性均有所提高,同時磨損量降低到了未改性樣品的20.8%。(4)在水熱100℃條件下氧化處理碳布的基礎(chǔ)上制備碳布增強(qiáng)濕式摩擦材料,分別與以45#鋼、Cr12鋼、不銹鋼、銅為對偶材料進(jìn)行了摩擦磨損性能的測試,研究了不同對偶材料對碳布增強(qiáng)濕式摩擦材料摩擦學(xué)性能的影響。結(jié)果表明:以銅為對偶材料時,在磨損過程中銅逐漸從對偶面轉(zhuǎn)移到摩擦材料表面,主要以黏著磨損為主,大大降低了對摩擦材料的損傷;以45#鋼為對偶材料時,摩擦材料以磨粒磨損和黏著磨損為主,耐磨性能有所下降;以不銹鋼、Cr12為對偶材料時,碳布增強(qiáng)濕式摩擦材料出現(xiàn)大量的纖維斷裂現(xiàn)象,磨損機(jī)理主要以磨粒磨損為主,導(dǎo)致了較高的磨損。
[Abstract]:As an important component of wet friction materials, resin matrix composites are widely used in automotive automatic transmission, synchronizer, differential and torque management. With the development of technology, high-speed rail, subway. The adaptability of transmission / braking system of large-scale construction machinery, deep-sea oil drilling and so on to resin matrix composites. More stringent requirements are put forward in terms of transmission smoothness and service life. Carbon cloth is used as reinforcement in this paper. The effects of different modified phenolic and dual materials on tribological properties of carbon cloth reinforced wet friction materials were studied. The effects of hydrothermal oxidation and microwave hydrothermal deposition of nano-SiO _ 2 modified carbon cloth on friction materials were studied. Three kinds of carbon cloth reinforced wet friction materials were prepared by cashew shell oil modification and acrylonitrile rubber modified phenolic resin. The thermal degradation characteristics of the samples were analyzed by thermal analyzer. The friction and wear properties of the samples were tested by wet friction tester. The wear mechanism of the samples was analyzed by SEM. The results showed that the carbon cloth reinforced wet friction materials prepared by boron modified phenolic resin showed good heat resistance and higher friction coefficient. Excellent friction stability and low wear rate. 2) carbon cloth was treated with concentrated nitric acid at different hydrothermal temperatures by hydrothermal oxidation. The effect of hydrothermal temperature on tribological properties was studied in detail. The results showed that the surface morphology of carbon cloth modified by hydrothermal oxidation temperature changed and a large number of carbonyl groups appeared at the same time. The graphitization degree of carbon fiber was improved, and the surface hydrophilicity of carbon cloth was improved obviously. The bonding strength between carbon cloth and resin was improved effectively. The hydrothermal oxidation modified carbon cloth reinforced wet friction material showed the best friction and wear performance at 100-120 鈩，

本文編號：1380460