稀释剂添加量对燃烧合成亚微米ZrB2微观组织的影响

doi:10.3724/SP.J.1077.2014.13147

无机材料学报 ›› 2014, Vol. 29 ›› Issue (2): 191-196.DOI: 10.3724/SP.J.1077.2014.13147 CSTR: 32189.14.SP.J.1077.2014.13147

稀释剂添加量对燃烧合成亚微米ZrB₂微观组织的影响

喇培清, 韩少博, 卢学峰, 魏玉鹏

(兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室, 兰州 730050)

收稿日期:2013-03-13 修回日期:2013-04-21 出版日期:2014-02-20 网络出版日期:2014-01-17
基金资助:
国家自然科学基金(51164022)

Effects of the Diluent Content on Microstructure of Submicron ZrB₂ by Combustion Synthesis

LA Pei-Qing, HAN Shao-Bo, LU Xue-Feng, WEI Yu-Peng

(Lanzhou University of Technology, State Key Laboratory of Gansu Advanced Non-ferrous Materials, Lanzhou 730050, China)

Received:2013-03-13 Revised:2013-04-21 Published:2014-02-20 Online:2014-01-17
Supported by:
National natural Science Foundation of China (51164022)

摘要/Abstract

摘要： 以NaCl为稀释剂, B₂O₃、ZrO₂和Mg粉为原料, 利用燃烧合成法成功制备了亚微米ZrB₂粉体, 并对其进行了SEM、EDS, XRD和粒度分析。结果表明: 随着稀释剂添加量增加, 体系绝热温度下降; 浸出产物是由少量的大尺寸颗粒和大量的小尺寸颗粒形成的弱团聚体; 稀释剂摩尔数k值从0.5增加到1.5时, 产物平均颗粒尺寸从305 nm降低到160 nm; 产物浸出后主要物相为ZrB₂和ZrO₂, 后者含量随稀释剂添加量增加而降低。稀释剂可以提供液态介质, 促进质量传输, 提高产物纯度, 还可以降低体系燃烧温度, 并包覆在产物表面抑制其结晶长大, 降低颗粒尺寸。

关键词: NaCl稀释剂, 燃烧合成, ZrB₂, 亚微米粉体

Abstract: Submicron ZrB₂ powders were prepared by combustion synthesis using NaCl as the diluent and B₂O₃, Mg and ZrO₂ as raw materials. The samples were analyzed by SEM, EDS, XRD and particle size analyzer. The results show that adiabatic temperature of the system decreases with the diluent content increase. The products are aggregates which contain a small amount of larger-sized particles and a large number of small-sized particles. The average particle size of products drops from 305 nm to 160 nm as the value of k, i.e. molar ratio of the diluent, increases from 0.5 to 1.5. The products after leaching mainly consist of ZrB₂ and ZrO₂, and the content of the latter decreases with the increase of k. NaCl plays very important roles, such as providing a liquid medium, promoting the mass transfer, improving the purity of the products, and reducing the combustion temperature of the system, inhibiting growth of particles by giving a coating on the surface, and leading to small-sized particles.

Key words: NaCl diluent, combustion synthesis, ZrB₂, submicron powders

中图分类号:

TQ174

喇培清, 韩少博, 卢学峰, 魏玉鹏. 稀释剂添加量对燃烧合成亚微米ZrB₂微观组织的影响[J]. 无机材料学报, 2014, 29(2): 191-196.

LA Pei-Qing, HAN Shao-Bo, LU Xue-Feng, WEI Yu-Peng. Effects of the Diluent Content on Microstructure of Submicron ZrB₂ by Combustion Synthesis[J]. Journal of Inorganic Materials, 2014, 29(2): 191-196.

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稀释剂添加量对燃烧合成亚微米ZrB₂微观组织的影响

Effects of the Diluent Content on Microstructure of Submicron ZrB₂ by Combustion Synthesis

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