Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 19 Special 3 December 2009|
（1. National Engineering Research Center for Technology and Equipment of Green Coating,
Lanzhou Jiaotong University, Lanzhou 730070, China;
2. Institute for Plasma and Metal Materials, Lanzhou University, Lanzhou 730000, China）
Abstract:The Si3N4 microcrystals with a hollow sphere structure were prepared by using the simple heat treatment of the Si3N4 flakes, which were prepared by using the cathode arc plasma. The products were characterized by XRD, SEM and TEM. The photoluminescence (PL) spectrum of the Si3N4 nano-microsphere was studied. The obtained Si3N4 microcrystals, which show a hollow sphere structure, are up to several nanometers in diameter. During the process, the heat treatment and Ni catalyst play a key role in the forming structure and morphology. This result provides a possibility for mass producing Si3N4 microcrystals.
Key words: Si3N4 hollow sphere; heat treatment; photoluminescence; cathode arc plasma