本文選題：PTFE + 三層復(fù)合材料　； 參考：《合肥工業(yè)大學(xué)》2015年碩士論文

【摘要】：工業(yè)科技的進(jìn)步發(fā)展對(duì)滑動(dòng)支承制品不斷提出更苛刻的性能要求,PTFE三層復(fù)合材料作為卷制滑動(dòng)支承制品的原材料之一,對(duì)其性能進(jìn)行改進(jìn)是必要的。長(zhǎng)久以來,針對(duì)PTFE三層復(fù)合材料的填充改性研究已經(jīng)做得非常深入了,但是關(guān)于稀土元素添加改性的研究不多。在此背景下,本課題以稀土作為改性原料,制備了一系列稀土改性PTFE三層復(fù)合材料。同時(shí),采用不同的制備工藝制備了PTFE三層復(fù)合材料。在HDM-20端面摩擦磨損試驗(yàn)機(jī)上,分別模擬了干摩擦、油潤滑工況條件進(jìn)行了摩擦磨損實(shí)驗(yàn)。利用光學(xué)顯微鏡和掃描電鏡對(duì)試樣磨損表面進(jìn)行了觀測(cè),并對(duì)實(shí)驗(yàn)結(jié)果進(jìn)行了分析。 稀土改性的研究結(jié)果表明：經(jīng)稀土改性的復(fù)合材料能夠在摩擦面形成光滑致密的鉛、二硫化鉬保護(hù)膜,極大地改善了復(fù)合材料耐磨性；稀土改性能降低聚四氟乙烯的熱膨脹系數(shù),從而減小了復(fù)合材料中各組分熱性能的差異,減少了復(fù)合材料龜裂紋的產(chǎn)生,并阻止了裂紋的擴(kuò)散；以鹵化物溶液的形式進(jìn)行改性能夠使稀土分布得更均勻,從而獲得更好的改性效果。稀土單獨(dú)改性比混合改性獲得更好的改性效果,且稀土鑭、鈰含量分別為0.75%、1%時(shí),稀土單獨(dú)改性的PTFE三層復(fù)合材料分別獲得最好的改性效果。 在制備工藝的研究中,得出如下結(jié)論：銅粉板的目數(shù)、復(fù)合工藝、減摩塑料層的厚度都影響著制備的三層復(fù)合材料的性能。隨著銅粉目數(shù)的增大,制備的三層復(fù)合材料的表層減摩塑料層與中間燒結(jié)層之間的結(jié)合力降低。但較小目數(shù)的銅粉板易引起表面減摩層的橘皮現(xiàn)象,加重材料的疲勞磨損；干濕法制備的復(fù)合材料容易在摩擦表面上形成覆蓋均勻的鉛保護(hù)膜,較好的保護(hù)了PTFE基體材料,使得干濕法制備的復(fù)合材料具備更好的耐磨性；較厚的減摩層易積聚摩擦熱,加劇了PTFE的蠕變,從而降低了材料的耐磨性。但較薄的減摩層限制了材料的使用極限。 本課題通過對(duì)稀土改性PTFE三層復(fù)合材料摩擦學(xué)性能的研究及配方的優(yōu)化設(shè)計(jì)分析,和對(duì)制備工藝中影響PTFE三層復(fù)合材料性能的關(guān)鍵因素研究,在產(chǎn)品性能的提高和制備工藝技術(shù)的優(yōu)化方面取得了有益的成果,對(duì)行業(yè)生產(chǎn)技術(shù)的進(jìn)步具有一定的參考實(shí)用價(jià)值。
[Abstract]:With the development of industrial science and technology, it is necessary to improve the performance of PTFE three-layer composite material as one of the raw materials for rolling sliding support products.For a long time, the research on the filling modification of PTFE three-layer composites has been very thorough, but the research on rare earth element modification is rare.Under this background, a series of rare earth modified PTFE three-layer composites were prepared.At the same time, PTFE three-layer composites were prepared by different preparation processes.The friction and wear experiments of dry friction and oil lubrication were carried out on the HDM-20 end face friction and wear tester.The wear surface of the sample was observed by optical microscope and scanning electron microscope, and the experimental results were analyzed.The results of rare earth modification show that the composites modified by rare earth can form smooth and compact lead and molybdenum disulfide protective film on the friction surface, which greatly improves the wear resistance of the composites.The rare earth modification can reduce the thermal expansion coefficient of PTFE, reduce the difference of the thermal properties of each component in the composite, reduce the crack generation of the composite turtle, and prevent the crack diffusion.The modification of rare earth in the form of halide solution can make the distribution of rare earth more uniform and obtain better modification effect.The results show that the rare earth modification alone is better than the mixed modification, and the rare earth lanthanum and cerium contents are 0.75 and 0.75 respectively. When the rare earth alone modifies the PTFE three-layer composite, the best modification effect is obtained.In the study of the preparation process, the following conclusions are drawn: the number of copper powder plates, the composite process and the thickness of antifriction plastic layer all affect the properties of the three-layer composite material.With the increase of copper mesh number, the adhesion between the surface antifriction plastic layer and the intermediate sintering layer of the three-layer composite is decreased.However, the copper powder plate with smaller number of particles can easily cause the orange peel phenomenon in the antifriction layer on the surface and aggravate the fatigue wear of the material. The composite prepared by the dry and wet method can easily form a uniform lead protective film on the friction surface, which can better protect the PTFE matrix material.The composite prepared by dry and wet method has better wear resistance, and the thick antifriction layer is easy to accumulate friction heat, which intensifies the creep of PTFE, thus reducing the wear resistance of the material.However, the use limit of the material is limited by the thin antifriction layer.In this paper, the tribological properties of PTFE three-layer composites modified by rare earth and the optimization design of the formula are studied, and the key factors affecting the properties of PTFE three-layer composites in the preparation process are also studied.Good results have been obtained in improving the product performance and optimizing the preparation technology. It has certain reference and practical value for the progress of production technology in the industry.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ325.4;TB33

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉勇;蔣斌;郝明鳳;丁玉梅;楊衛(wèi)民;屈興榮;;滑動(dòng)軸承聚合物基自潤滑材料的開發(fā)與應(yīng)用進(jìn)展[J];工程塑料應(yīng)用;2010年01期

2 趙普,劉近朱,王齊華,楊麗君,李旭玲;聚苯酯、聚酰亞胺填充聚四氟乙烯復(fù)合材料的摩擦學(xué)性能研究[J];材料科學(xué)與工程學(xué)報(bào);2003年06期

3 俞建衛(wèi);李衛(wèi)榮;焦明華;馬少波;劉q;;燒結(jié)工藝對(duì)PTFE自潤滑軸承材料摩擦性能的影響[J];軸承;2007年08期

4 焦明華;溫丹丹;田明;解挺;尹延國;馬少波;;塑化燒結(jié)對(duì)無鉛PTFE 3層復(fù)合材料減摩耐磨性能影響[J];軸承;2010年09期

5 張建強(qiáng);馮輝霞;邱建輝;;二硫化鉬粉體的表面改性研究[J];中國粉體技術(shù);2009年04期

6 黃承亞;龔克成;蔡立芳;李紅;;無機(jī)填料增強(qiáng)聚苯酯/聚四氟乙烯復(fù)合材料的力學(xué)和摩擦磨損性能[J];復(fù)合材料學(xué)報(bào);2006年04期

7 萬芳新;何春霞;黃曉鵬;;碳纖維填充PTFE復(fù)合材料摩擦磨損性能研究[J];甘肅農(nóng)業(yè)大學(xué)學(xué)報(bào);2009年02期

8 焦明華;張武軍;田明;蘇柏萬;解挺;;聚酰亞胺填充三層復(fù)合材料摩擦磨損影響因素分析[J];軸承;2013年01期

9 魏美英;汪海風(fēng);王菊華;徐意;王新敏;羅仲寬;楊輝;;MoS_2填充PTFE復(fù)合材料的制備及性能研究[J];材料導(dǎo)報(bào);2013年S1期

10 劉q,焦明華;機(jī)械產(chǎn)品創(chuàng)新與摩擦學(xué)設(shè)計(jì)[J];合肥工業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);2005年09期

，

本文編號(hào)：1766192