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《科学通报(英文版)》 2003-05
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Fabrication of silicon nitride/ boron nitride nanocomposite powder

WANG Xiangdong1, QIAO Guanjun1, Kusunose Takafumi2 & JIN Zhihao1 1. State Key Laboratory for Mechanical Behavior of Materials, Xi抋n Jiaotong University, Xi抋n 710049, China; 2. Institute of Science and Industry Research (ISIR), Osaka University, Osaka 5670047, Japan Correspondence should be addressed to Wang Xiangdong (e-mail: wang90xd@163.com)  
Si3N4/BN nanocomposite powders with the mi-crostructure of the micro-sized a-Si3N4 particles coated with nano-sized BN particles were synthesized via the chemical reaction of boric acid, urea, and a-Si3N4 powder in a hydro-gen gas. The results of XRD, TEM, and selected area elec-tron diffraction showed that amorphous BN and a little amount of turbostratic BN(t-BN) were coated on Si3N4 parti-cles as the second phase after reaction at 1100℃. After re-heating the composite powders at 1450℃ in a nitrogen gas, the amorphous and turbostratic BN is transformed into h-BN. These nanocomposite powders can be used to prepare Si3N4/BN ceramic composites by hot-pressing at 1800℃, which have perfect machinability and can be drilled with normal metal tools.
【Fund】: the National Natural Science Foundation of China (Grant No. 50072017)
【CateGory Index】: TB383
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1 LIU Su-jing, LIN Jing, SONG Hai-sheng, WEI Si-yi, TANG Cheng-chun(College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China);Large-scale Preparation of Uniform and Monodispersed Boron Nitride Spherical Particles by Spray Pryolysis Technique[J];Huazhong Normal University Journal of Postgraduates;2006-03
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