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  本文關(guān)鍵詞：銅—石墨—碳化硅復合材料的成形研究　出處：《北京交通大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 銅-石墨-碳化硅 機械攪拌 半固態(tài) 鑄造

【摘要】：摘要：銅-石墨-碳化硅集合石墨的自潤滑性、碳化硅的高耐磨性和銅合金的高導電導熱性于一體,是一種綜合性能優(yōu)異的新型復合材料,廣泛應用于機械制造以及鐵路運輸?shù)葘щ妼嵊休^高要求的環(huán)境中。為了研發(fā)并制備出性能優(yōu)異的銅-石墨-碳化硅復合材料,本文對該種復合材料的成形方式展開研究。針對現(xiàn)有常規(guī)制備方法成本高、工藝復雜、外加組分偏析等問題,本研究采用半固態(tài)鑄造成形法制備銅-石墨-碳化硅復合材料,首先采用自主研發(fā)的雙層槳葉機械攪拌法制備出外加顆粒均勻分布的銅-石墨-碳化硅的半固態(tài)漿料,然后進行常規(guī)鑄造,成功制備出石墨和碳化硅顆粒均勻分布的銅-石墨-碳化硅復合材料,主要研究與成果如下： (1)采用自行設計的單層槳葉機械攪拌槳制備銅-石墨-碳化硅半固態(tài)漿料,研究槳葉與水平面的夾角Y對外加石墨和碳化硅顆粒分布的影響。實驗研究發(fā)現(xiàn),當γ=30°條件下進行機械攪拌可以實現(xiàn)石墨顆粒的均勻分布,但碳化硅顆粒仍然出現(xiàn)團聚,說明單層槳葉機械攪拌的攪拌力度不夠； (2)采用自行設計的雙層槳葉機械攪拌槳制備銅-石墨-碳化硅半固態(tài)漿料,研究雙層槳葉的間距h對外加碳化硅顆粒分布的影響。實驗研究發(fā)現(xiàn),當h=10～20mm條件下進行機械攪拌可以消除碳化硅顆粒的團聚,實現(xiàn)石墨和碳化硅顆粒都均勻在銅-石墨-碳化硅半固態(tài)漿料中； (3)制取外加組分均勻分布的銅-石墨-碳化硅半固態(tài)漿料,建立固相率和攪拌溫度之間的關(guān)系模型； (4)進行銅-石墨-碳化硅半固態(tài)漿料的常規(guī)鑄造,制備銅-石墨-碳化硅復合材料。建立固相率與鑄錠中石墨和碳化硅顆粒分布的關(guān)系模型,確定實現(xiàn)石墨和碳化硅顆粒在鑄錠中均勻分布的條件：固相率大于20%。
[Abstract]:Abstract: self lubrication copper graphite silicon carbide set of graphite, silicon carbide, high wear resistance and high conductivity copper alloy in one, is a novel composite material with excellent comprehensive properties, widely used in machinery manufacturing and railway transportation of high thermal conductivity to the environment. In order to develop and preparing excellent copper - graphite - silicon carbide composite material, this paper studies the forming method of this kind of composite material. In view of the existing conventional preparation method of high cost, complex technology, and component segregation problem, this research adopts semi solid casting preparation of copper graphite silicon carbide composite forming method, double the first blade adopts a self-developed mechanical stirring was prepared with semi solid slurry particles of copper graphite and silicon carbide, and then successfully prepared by conventional casting, graphite and silicon carbide particles uniformly The main research and achievements of the distributed copper - graphite - silicon carbide composites are as follows:
(1) the single blade machine designed by copper - graphite - SiC semi solid slurry mixing system of blade and propeller, the angle between the horizontal Y external effects of graphite and silicon carbide particle distribution. The experimental study found that when gamma =30 degrees under the condition of mechanical agitation can achieve uniform distribution of graphite particles, but silicon carbide there is still a particle agglomeration, mechanical stirring that single blade is not enough;
(2) using the double blade machine designed by copper - graphite - SiC semi-solid slurry preparation stirring paddle, double blade spacing of H external effects of SiC particle distribution. The experimental study found that when the h=10 ~ 20mm under the condition of mechanical stirring can eliminate silicon carbide particle agglomeration, graphite and silicon carbide particles are even in the copper - graphite - silicon carbide in the semi-solid slurry;
(3) the semisolid slurry of copper graphite - silicon carbide with uniform distribution of the added component was made, and the relationship model between the solid state rate and the stirring temperature was established.
(4) the conventional casting copper graphite silicon carbide semi-solid slurry, preparation of copper - graphite - silicon carbide composite material. The establishment of solid rate and the relation model of graphite and silicon carbide particle distribution in ingot, determine the implementation of graphite and silicon carbide particles in the casting conditions: the solid fraction is greater than 20%.

【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB333

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