Effect of graphite contents on friction and wear properties of Ni-Cr-W composites  

作　　者：李建亮 熊党生 戴俊峰 

机构地区：[1]Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

出　　处：《中国有色金属学会会刊：英文版》2005年第S3期171-175,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(K1703060819)supportedbytheNationalDefenceBasicResearchofChina

摘　　要：Ni-based alloy/W/graphite self-lubricating composites with different graphite addition amounts were prepared using PM （powder metallurgy） method. It is found that the addtion of graphite can increase the tensile strength and hardness, while the bending strength decreases. The tribological properties of the composites when rubbing with Al2O3 ceramic disc were investigated in the temperature range of 20600℃. The results show that the tribological properties of the alloy are improved by adding graphite. When the graphite content is up to 9%, the friction coefficient at 600℃ is about 0.2, which is one third of that with no graphite. At elevated temperature, the friction coefficients change a little with velocity and load. At room temperature, graphite extruded from the composite plays the the role of lubrication. The synergistic effect of oxide films and graphite are responsible for the reduction of friction coefficient at high temperature.Ni-based alloy/W/graphite self-lubricating composites with different graphite addition amounts were prepared using PM (powder metallurgy) method. It is found that the addtion of graphite can increase the tensile strength and hardness, while the bending strength decreases. The tribological properties of the composites when rubbing with Al_2O_3 ceramic disc were investigated in the temperature range of 20600℃. The results show that the tribological properties of the alloy are improved by adding graphite. When the graphite content is up to 9%, the friction coefficient at 600℃ is about 0.2, which is one third of that with no graphite. At elevated temperature, the friction coefficients change a little with velocity and load. At room temperature, graphite extruded from the composite plays the the role of lubrication. The synergistic effect of oxide films and graphite are responsible for the reduction of friction coefficient at high temperature.

关 键 词：Ni/graphite composite POWDER METALLURGY high temperature SELF-LUBRICATION 

分 类 号：TB331[一般工业技术—材料科学与工程]