文档介绍：广东工业大学项士学位论文
墨含量为15wt%时,。,粉末
冶金法制备的石墨/铝复合材料,力学性能较差,15wt%%,导热系数存在各项异性, 摩擦系数基本一致。
关键词:活塞;石墨/铝复合材料;粉末冶金;摩擦系数
万方数据
Abstract
The performance of piston material has been put forward higher requirements, with the development of the bustion engine tO light weight,high power, low fuel consumption,low emission,long ,a new development trend is to develop new piston materials to adapt to the different working conditions and the working material is an excellent material for piston,and is characterized by self lubrication,low friction coefficient, good thermal conductivity,thermal expansion coefficient,etc
This paper has tested and analyzed a piston with high carbon graphite/posite material on ponents anization,physical properties,friction and wear test results show that,microstructure of the high carbon-graphite/posi te materi al pact,graphite content is up to %;thermal expansion coefficient is ×10。6/。C;thermal
conductivit)r is 135w∞幸后)-1;the friction coefficient is ;c。mpressive strength at
room temperature i s up to 240Mp a,and the bending strength is 1 3 mpared with the traditional aluminum alloy piston material ZLl05,density of high carbon—graphite/posite material is reduced by 20%:the thermal
expansion coefficient is reduced by 66%;coefficient of thermal conductivity
decreases 1 0%.the other advantage are the anti friction and wear resistance and dimensional stability.
At the present time,the processing technique of graphite/al posite material is liquid phase method including casting and vacuum pressure dipping infiltration it is difficult to produce a graphite/posite material with high graphite content and pacted microstructure because of the poor wetting property and the large difference of the process of producing graphite/posites material by powder metallurgy,the
content ponent materials c