铜—石墨—碳化硅复合材料的成形研究

发布时间：2018-01-04 04:25

本文关键词：铜—石墨—碳化硅复合材料的成形研究　出处：《北京交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：摘要：铜-石墨-碳化硅集合石墨的自润滑性、碳化硅的高耐磨性和铜合金的高导电导热性于一体,是一种综合性能优异的新型复合材料,广泛应用于机械制造以及铁路运输等对导电导热有较高要求的环境中。为了研发并制备出性能优异的铜-石墨-碳化硅复合材料,本文对该种复合材料的成形方式展开研究。针对现有常规制备方法成本高、工艺复杂、外加组分偏析等问题,本研究采用半固态铸造成形法制备铜-石墨-碳化硅复合材料,首先采用自主研发的双层桨叶机械搅拌法制备出外加颗粒均匀分布的铜-石墨-碳化硅的半固态浆料,然后进行常规铸造,成功制备出石墨和碳化硅颗粒均匀分布的铜-石墨-碳化硅复合材料,主要研究与成果如下： (1)采用自行设计的单层桨叶机械搅拌桨制备铜-石墨-碳化硅半固态浆料,研究桨叶与水平面的夹角Y对外加石墨和碳化硅颗粒分布的影响。实验研究发现,当γ=30°条件下进行机械搅拌可以实现石墨颗粒的均匀分布,但碳化硅颗粒仍然出现团聚,说明单层桨叶机械搅拌的搅拌力度不够； (2)采用自行设计的双层桨叶机械搅拌桨制备铜-石墨-碳化硅半固态浆料,研究双层桨叶的间距h对外加碳化硅颗粒分布的影响。实验研究发现,当h=10～20mm条件下进行机械搅拌可以消除碳化硅颗粒的团聚,实现石墨和碳化硅颗粒都均匀在铜-石墨-碳化硅半固态浆料中； (3)制取外加组分均匀分布的铜-石墨-碳化硅半固态浆料,建立固相率和搅拌温度之间的关系模型； (4)进行铜-石墨-碳化硅半固态浆料的常规铸造,制备铜-石墨-碳化硅复合材料。建立固相率与铸锭中石墨和碳化硅颗粒分布的关系模型,确定实现石墨和碳化硅颗粒在铸锭中均匀分布的条件：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%.

【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB333

【参考文献】