本文關(guān)鍵詞： PEEK PTW PTFE 力學(xué)性能 摩擦學(xué)性能　出處：《湖南工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本論文研究了用六鈦酸鉀晶須(PTW)和聚四氟乙烯(PTFE)填充改性聚醚醚酮(PEEK),制得PTW/PEEK和PTFE/PTW/PEEK復(fù)合材料,并探討了復(fù)合材料的力學(xué)及摩擦學(xué)性能。先用偶聯(lián)劑對(duì)六鈦酸鉀晶須進(jìn)行活化處理,篩選確定了合適的偶聯(lián)劑類型并確定了其最佳用量,用經(jīng)過(guò)活化處理后的PTW填充改性PEEK制得復(fù)合材料,并通過(guò)注塑成型制備檢測(cè)試樣。采用MM200摩擦磨損試驗(yàn)機(jī)和45#鋼環(huán)配副研究了PTW質(zhì)量分?jǐn)?shù)對(duì)復(fù)合材料摩擦學(xué)性能的影響以及PTW和PTFE對(duì)復(fù)合材料的協(xié)同作用效果。利用掃描電子顯微鏡觀察分析了復(fù)合材料斷口表面和磨損表面形貌,并分析了磨損機(jī)理。研究結(jié)果表明,鈦酸酯偶聯(lián)劑TM38-S適合用于活化處理PTW,且當(dāng)TM38-S用量為PTW質(zhì)量分?jǐn)?shù)的1%時(shí),活化效果最好。對(duì)PTW/PEEK復(fù)合材料注塑成型條件研究表明,注塑溫度及模具溫度對(duì)復(fù)合材料的力學(xué)性能影響極大:隨著注塑溫度的升高,制品的拉伸強(qiáng)度和彎曲強(qiáng)度呈現(xiàn)先升后降的趨勢(shì),當(dāng)注塑溫度過(guò)高時(shí),PEEK的熱分解現(xiàn)象加劇,在注塑制品中容易生成大的球晶,從而使制品易碎,力學(xué)性能降低;隨著模具溫度的升高,制品的拉伸強(qiáng)度和彎曲強(qiáng)度也隨之升高,但是當(dāng)模具溫度過(guò)高時(shí),制品的內(nèi)部會(huì)產(chǎn)生氣孔,容易產(chǎn)生產(chǎn)品塌陷現(xiàn)象。故控制模具溫度為(180±10)℃,在此溫度下,熔體有較好的充模特性,材料的結(jié)晶度高,并且無(wú)再結(jié)晶峰,力學(xué)性能優(yōu)良;另外通過(guò)對(duì)PTW/PEEK制品進(jìn)行退火處理后,PTW/PEEK制品的力學(xué)性能進(jìn)一步得到提高。在注塑溫度由前到后依次為390℃、380℃、365℃,模具溫度為180℃,對(duì)PTW/PEEK制品進(jìn)行注塑成型后,并在退火處理?xiàng)l件為200℃,1h下對(duì)試樣進(jìn)行退火后,所制得的復(fù)合材料的綜合性能最優(yōu)。在干摩擦條件下,填充PTW可明顯降低PEEK基復(fù)合材料的摩擦系數(shù),隨著PTW含量增加,PTW/PEEK復(fù)合材料摩擦系數(shù)先降低后略有升高,復(fù)合材料的磨損量也隨PTW含量的增加而降低,當(dāng)PTW含量為15%時(shí)耐磨性能最佳。PTFE以一定的質(zhì)量比添加進(jìn)PTW/PEEK復(fù)合材料時(shí)可降低復(fù)合材料摩擦系數(shù),也使復(fù)合材料的耐磨性顯著提高,且隨著PTFE質(zhì)量分?jǐn)?shù)增加,PTFE/PTW/PEEK復(fù)合材料的耐磨性能隨之提高,但復(fù)合材料的力學(xué)性能降低,這是由于組分間相容性不佳造成的。分析認(rèn)為,PTW晶須提高了復(fù)合材料的表面承載能力,摩擦過(guò)程中減少摩擦副表面粘著和剝層,阻止基體樹脂的熱塑性變形,同時(shí)PTFE的優(yōu)先粘著轉(zhuǎn)移使得PTW/PTFE/PEEK復(fù)合材料在對(duì)偶表面形成的轉(zhuǎn)移膜最薄,連續(xù)性與均勻性最好,兩者協(xié)同有效提高復(fù)合材料的摩擦學(xué)性能。綜合考慮復(fù)合材料耐磨性能、力學(xué)性能與配方成本,本文研究得出復(fù)合材料中PTW:PTFE:PEEK最佳質(zhì)量配比為15:8:77。
[Abstract]:In this paper, the modified polyether ether ketone (PEEK) was filled with potassium hexatitanate (PTW) and PTFEs (PTFEs). PTW/PEEK and PTFE/PTW/PEEK composites were prepared, and the mechanical and tribological properties of the composites were discussed. Firstly, potassium hexatitanate whiskers were activated by coupling agent. The suitable type of coupling agent was selected and the optimum dosage was determined. The composite material was prepared by filling the modified PEEK with activated PTW. The effect of PTW mass fraction on the tribological properties of composites and the effects of PTW and PTFE on the tribological properties of composites were studied by MM200 friction and wear test machine and 4 steel ring matching pair. Scanning electron microscope (SEM) was used to observe and analyze the fracture surface and wear surface morphology of the composites. The wear mechanism was analyzed. The results showed that the titanate coupling agent TM38-S was suitable for the activation treatment of PTW, and when the amount of TM38-S was 1% of PTW. The research on injection molding conditions of PTW/PEEK composite shows that injection temperature and mold temperature have great influence on the mechanical properties of the composite: with the increase of injection temperature. The tensile strength and bending strength of the products increased first and then decreased. When the injection temperature was too high, the thermal decomposition of peek was intensified, and the large spherulites were easily formed in the injection molding products, thus making the products fragile. Reduction of mechanical properties; With the increase of mold temperature, the tensile strength and bending strength of the product also increase, but when the mold temperature is too high, the internal pores will be produced. It is easy to produce product collapse, so the mold temperature is controlled at 180 鹵10 鈩，

本文編號(hào)：1445700