本文選題：SiC顆粒 + 鋁基復(fù)合材料��； 參考：《北京交通大學(xué)》2015年碩士論文

【摘要】：輕量化是我國(guó)高速列車(chē)發(fā)展的關(guān)鍵技術(shù)之一,開(kāi)發(fā)出能夠替代現(xiàn)有鋼鐵材料的新型輕質(zhì)高強(qiáng)材料具有重要的理論和實(shí)際意義。制動(dòng)盤(pán)作為車(chē)輛簧下重量的重要組成部分,采用鋁基復(fù)合材料制備制動(dòng)盤(pán)可以顯著降低高速列車(chē)簧下重量。應(yīng)列車(chē)輕量化的趨勢(shì)需求,本文采用真空半固態(tài)攪拌鑄造法研制出了顆粒含量高達(dá)40vol.%的SiCp/A356復(fù)合材料。本文主要研究了 復(fù)合材料制備工藝,并提出了“稀釋法”40vol.%SiCp/A356制備高SiC顆粒含量鋁基復(fù)合材料衍生材料的方式,即通過(guò)向高SiC顆粒含量鋁基復(fù)合材料中加入不同量的補(bǔ)償鋁合金并進(jìn)行二次攪拌制備各種SiC顆粒含量低于40vol.%的復(fù)合材料,對(duì)比了SiC顆粒含量分別為的衍生材料和直接攪拌制備的復(fù)合材料的力學(xué)性能及復(fù)合質(zhì)量,研究結(jié)果表明：10vol.%、20vol.%、30vol.%在攪拌溫度為580℃條件下,以1200rpm攪拌30分鐘,通過(guò)金相觀察,顆粒 在基體中得到很好的分散,SiC顆粒與基體之間界面結(jié)合良好,制備出的復(fù)合材料孔隙率為0.88%;向復(fù)合材料中加入基體合金0.7wt%的晶粒細(xì)化劑可以使組織晶粒更細(xì)小、SiC顆粒得到更好的分散。通過(guò)“稀釋法”制備的復(fù)合材料衍生材料不論在力學(xué)性能還是復(fù)合質(zhì)量方面 都優(yōu)于直接攪拌制備的復(fù)合材料。衍生材料的SiC顆粒含量偏差和孔隙率存在“稀釋效應(yīng)”,即SiC顆粒含量越低,SiC顆粒含量偏差和孔隙率越低。SiC顆粒含量為20vol.%的衍生材料綜合力學(xué)性能最好,抗拉強(qiáng)度為296MPa,延伸率為1.08%,硬度為121.5HB。復(fù)合材料斷口顯示,其斷裂的方式以顆粒的斷裂和基體的撕裂為主。本文成功制備了SiC顆粒含量高達(dá)40vol.%的 復(fù)合材料,研究了該SiCp/A356復(fù)合材料的制備工藝,提出了一種新的復(fù)合材料制備方法——“稀釋法”,并分析了該方法的優(yōu)勢(shì)。
[Abstract]:Lightweight is one of the key technologies in the development of high-speed trains in China. It is of great theoretical and practical significance to develop new lightweight and high-strength materials that can replace existing steel materials.Brake disc is an important part of vehicle underspring weight. Using aluminum matrix composite to prepare brake disc can significantly reduce the underspring weight of high-speed train.In order to meet the demand of light weight of train, SiCp/A356 composites with 40 vol.% particle content were prepared by vacuum semi solid stirring casting.This paper mainly studiesThe preparation process of composite material and the method of "dilution method" 40vol.%SiCp/A356 for preparing high SiC particle content aluminum matrix composite derived materials were put forward.That is, by adding different amount of compensated aluminum alloy to the aluminum matrix composites with high SiC particle content and making secondary stirring, various kinds of composites with SiC particle content less than 40 vol.% were prepared.The mechanical properties and composite quality of the derived materials with SiC particle content and the composites prepared by direct stirring were compared. The results showed that: 10vol.20 vol.530vol.% was agitated at 580 鈩，

本文編號(hào)：1739388