Structural evolution of Si-50%C powder during mechanical alloying and heat treatment

• Published in: Transactions of Nonferrous Metals Society of China Vol. 18; no. 4; pp. 865 - 871
• Main Author: 汤文明 郑治祥 吴玉程 徐光青 吕珺 刘君武 王建民
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2008; School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
• Subjects: mechanical alloying; nanocrystalline; SiC; structural evolution; 机械合金化; 热处理; 碳化硅; 纳米晶; nanocrystalline; mechanical alloying; SiC; structural evolution
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(08)60150-8

The nanocrystalline β-SiC powder was successfully synthesized by ball milling the Si-50%C elemental powder. During ball milling, a solid solution of C in Si, Si（C）, firstly forms, followed by SiC. The formation of SiC is controlled by the mixing mechanism of the gradual diffusion reaction（GDR） and the mechanically induced self-propagating reaction（MSR）. The amount of β-SiC increases with milling time increasing. After 40 h milling, there exists only β-SiC in the milled powder. The grain size of β-SiC is about 6.4 nm after the powder is milled for 60 h. After the 60 h-milled Si-50%C elemental powder is heat treated at 1 100℃for l h, the grain size of β-SiC does not change, but the lattice ordering degree offl-SiC increases.