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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (14): 1411-1414. 上一篇    下一篇

研究论文

镁热还原催化合成亚稳态立方相氮化硼e-BN纳米多晶粉

王吉林，潘新叶，谷云乐*   

  1. (武汉工程大学材料科学与工程学院 武汉 430073)
  • 投稿日期:2009-04-14 修回日期:2010-01-06 发布日期:2010-03-22
  • 通讯作者: 谷云乐 E-mail:ncm@mail.wit.edu.cn

Magnesiothermic-reduction Catalytic Synthesis of Explosion Phase Boron Nitride (e-BN) Polycrystalline Nanopowders

GU Yun-Le,Ji-Lin WANG,Xin-Ye PAN   

  1. (School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430073)
  • Received:2009-04-14 Revised:2010-01-06 Published:2010-03-22
  • Contact: GU Yun-Le E-mail:ncm@mail.wit.edu.cn

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以无水氯化钴(CoCl2)为催化剂, 采用氧化硼(B2O3)和氯化铵(NH4Cl)为反应原料与镁粉在密闭反应釜内发生镁热还原反应合成了亚稳态立方氮化硼(e-BN)多晶粉. 产物粉末的X光衍射(XRD)分析表明晶格常数a＝0.8304 nm, 红外光谱(FTIR)在500, 650, 797, 1085, 1374和1580 cm－1有特征吸收峰. 扫描电子显微镜(SEM)观察到产物为近似球状颗粒, 平均直径为70 nm, 粒径均匀. 讨论了化学反应和产物在催化剂作用下的形成机理.

关键词: e-BN, 镁热还原, 合成, 纳米材料

A convenient route to bulk polycrystalline nanopowders of explosion phase boron nitride (e-BN) was carried out through magnesiothermic-reduction of boron oxide (B2O3) and ammonium chloride (NH4Cl) catalyzed with anhydrous cobalt chloride (CoCl2) at temperatures ranging from 650 to 800℃ in a sealed stainless steel autoclave. X-ray diffraction (XRD) indicates a cubic phase with lattice parameter a＝0.8304 nm. Fourier transform infrared spectroscopy (FTIR) shows characteristic absorption peaks at 500, 650, 797, 1085, 1374 and 1580 cm－1. Scanning electron microscopy (SEM) reveals the polycrystallites having approximately uniform quasi-spherical morphology with average diameter of about 70 nm. Chemical reaction and catalytic formation mechanism of the product was also proposed.

Key words: explosion phase boron nitride, magnesiothermic reduction, synthesis, nanomaterial