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›› 2001, Vol. 1 ›› Issue (4): 0-0.

• 4 •    

优势区相图在Al-TiO2-C-ZrO2燃烧合成体系热力学分析中的应用

董倩,唐清,李文超,吴东亚   

  1. 1. 中国科学院化工冶金研究所, 北京100080; 2. 北京科技大学物理化学系, 北京100083
  • 出版日期:2001-08-20 发布日期:2001-08-20

Electrocatalytic Activity of Ti/TiO2 Electrodes in H2SO4 Solution

WANG Ya-qiong(王雅琼),TONG Hong-yang(童宏扬),XU Wen-lin(许文林)   

  1. 1. Inst. Chem. Metall., Chinese Academy of Sciences, Beijing 100080, China; 2. Dept. Phy-chem., Univ. Sci. & Technol. Beijing, Beijing 100083, China
  • Online:2001-08-20 Published:2001-08-20

摘要: 以TiO2, Al, C和ZrO2为原料, 燃烧合成制备Al2O3-TiC-ZrO2纳米复相陶瓷是一种方法简单、节时省能的新工艺. 对Al-TiO2-C-ZrO2体系进行了热力学分析,计算出该体系的绝热燃烧温度, 并利用Al-O-N,Ti-O-N,Zr-O-N,C-O-N四个体系的叠加优势区相图, 分析了各相间反应进行的趋势和最终稳定存在的平衡相. 热力学分析表明:绝热燃烧温度为2327 K, 燃烧合成产物包括Al2O3,TiC,ZrO2三相. XRD检测未发现其它杂相, 证实热力学分析结果可信.

关键词: 优势区相图, 燃烧合成, 热力学分析

Abstract: Combustion synthesis of Al2O3-TiC-ZrO2 composites by reaction in the Al-TiO2-C-ZrO2 system is a new method with advantages of simplicity and efficiency. In the present work, the adiabatic combustion temperature of this complex system is calculated and the possible combustion products are discussed by a new approach of overlapped phase stability diagrams (PSD) of Al-O-N, Ti-O-N, Zr-O-N and C-O-N systems. Thermodynamic analysis shows that the adiabatic combustion temperature of the Al-TiO2-C-ZrO2 system with the addition of 10% ZrO2 is 2327 K which is the melting point of Al2O3, and the combustion product is a mixture of Al2O3-TiC-ZrO2. Microstructure and chemical composition of the combustion products are studied by X-ray diffraction analysis (XRD) and transmission electron microscope (TEM) respectively.

Key words: voltammetric charge, active surface, TiO2 electrode, electrochemistry

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