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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 4    August 2002

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Warm compacted NbC particulate reinforced
iron-base composite(Ⅰ)

——Effect of fabrication parameters

LI Yuan-yuan(李元元), XIAO Zhi-yu(肖志瑜), NGAI Tungwai Leo(倪东惠), 
ZHOU Zhao-yao(周照耀),SHAO Ming(邵  明)

Advanced Metallic Materials Research and Processing Technology Center, 
South China University of Technology, Guangzhou 510640, China

Abstract:NbC was used as reinforced particles in the fabrication of iron-base composite. Ball milling was introduced to overcome the problems of agglomeration and powder separation during powder mixing. After ball milling, the fine NbC particles are embedded on the surface of iron particles and evenly distributed in the mixed powders. Warm compaction was used not only to increase the green density but also to improve the formability of the mixed powder and to improve the compact 's green strength to facilitate handling. The influences of fabrication parameters such as ball milling time, annealing temperature and time, warm compaction temperature, sintering temperature and sintering time were studied. Compacts with a relative sintered density of 97% and a tensile strength of more than 800MPa can be obtained by using a ball milling time of 5h, an annealing temperature of 800℃, a compaction pressure of 600MPa, warm compaction temperature of 120℃, sintering temperature of 1280℃, and sintering time of 80min. The shrinkage at this sintering condition was approximately 4.3%.

 

Key words: iron-base composite; NbC particulate; warm compaction powder metallurgy

ISSN 1672-7029
CN 43-1423/U

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