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›› 2002, Vol. 2 ›› Issue (4): 0-0.

• 4 •    

纳米复相结构陶瓷的原位反应合成

张国军   

  1. Synergy Ceramics Laboratory, Fine Ceramics Research Association, Nagoya 463-8687, Japan
  • 出版日期:2002-08-20 发布日期:2002-08-20

Preliminary Study on the Carbonation of K2CrO4 for Recovery of Potassium Alkali

YANG Ren-chun1, HE Li-hui2, LI Zuo-hu1, ZHANG Yi1   

  1. 1. Institute of Chemical Metallurgy, Chinese Academy of Sciences, Beijing 100080, China;2. Environmental Protection Monitoring Station, Nanyang, Henan 473000, China
  • Online:2002-08-20 Published:2002-08-20

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被引次数

10

摘要： 简要介绍了原位反应合成纳米复相陶瓷的原理及其可行性，认为此方法是制备纳米复相结构陶瓷的有效方法. 同时讨论了氮化硼(h-BN)复相陶瓷的特点及其性能改善的关键因素，认为采用传统方法难以获得高性能的BN复相陶瓷. 提出了一系列原位化学反应，并采用热压或无压烧结获得了细小而均匀分散的非氧化物?氮化硼(Nobn)复相陶瓷，纳米级的BN片晶主要分布在基体晶粒的晶界处，当BN体积含量适当时即可获得一种全新的部分弱晶界陶瓷复合材料(PWICs)，这种材料具有很好的综合力学性能.

关键词: 原位反应合成, 结构陶瓷, 纳米复合材料, 氮化硼, 显微结构设计

Abstract: The effects of the K2CrO4 concentration, CO2 pressure and temperature on equilibrium concentration of KHCO3 were investigated respectively during the K2CrO4 carbonation with kinetic equations derived. Experimental results showed that the equilibrium concentration of KHCO3 was above 225 g/L under the optimal conditions of 40% K2CrO4 concentration, 0.6 MPa CO2 pressure and 18oC temperature. The kinetic equation was derived and its parameter was confirmed by experimental data .

Key words: K2CrO4, carbonation, potassium alkali, kinetics

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