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High Temperature Materials and Processes

Editor-in-Chief: Fukuyama, Hiroyuki

Editorial Board: Waseda, Yoshio / Fecht, Hans-Jörg / Reddy, Ramana G. / Manna, Indranil / Nakajima, Hideo / Nakamura, Takashi / Okabe, Toru / Ostrovski, Oleg / Pericleous, Koulis / Seetharaman, Seshadri / Straumal, Boris / Suzuki, Shigeru / Tanaka, Toshihiro / Terzieff, Peter / Uda, Satoshi / Urban, Knut / Baron, Michel / Besterci, Michael / Byakova, Alexandra V. / Gao, Wei / Glaeser, Andreas / Gzesik, Z. / Hosson, Jeff / Masanori, Iwase / Jacob, Kallarackel Thomas / Kipouros, Georges / Kuznezov, Fedor


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Open Access
Online
ISSN
2191-0324
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Volume 32, Issue 3

Issues

Effect of Water-Vapor Content on Reaction Rate of Hexagonal BN Powder at 1273 K

Ziyou Yu
  • State Key Laboratory of Advanced Metallurgy, and School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Other articles by this author:
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/ Xinmei Hou
  • Corresponding author
  • State Key Laboratory of Advanced Metallurgy, and School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
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/ Zhiyuan Chen
  • State Key Laboratory of Advanced Metallurgy, and School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Kuo-Chih Chou
  • State Key Laboratory of Advanced Metallurgy, and School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2013-06-15 | DOI: https://doi.org/10.1515/htmp-2012-0138

Abstract

Hexagonal BN powder with average particle size of 1.2 µm was exposed at 1273 K in H2O/air gas mixture with the range of mass ratio from 0:100 to 6.5:100 at a total pressure of 1 atm. Thermalgravimetry (TG) method was used to measure the reaction behavior of BN powder in water vapor. XRD and SEM were employed to analyze the phases and morphological revolution during reaction. The TG curves showed that the overall reaction process could be divided into two stages. In first stage, weight gained rapidly and the main reaction was the oxidation of BN. The weight gain turning point of the curves with different water-vapor contents varied, indicating that water-vapor had an impact on oxidation rate to some degree. In second stage, weight loss due to B2O3 reacting with H2O to form volatile product. The rate of weight loss increased with increasing the water vapor content. The reaction rate was described by a linear rate law, i.e., α = −klt. The relationship between kl and partial pressure of water vapor p was described by a function of kl = 0.4p. The determination of the activation energy was complicated due to variations in the reaction mechanism.

Keywords: reaction kinetics; water-vapor; content; BN; powder

About the article

Received: 2012-08-21

Accepted: 2012-11-09

Published Online: 2013-06-15

Published in Print: 2013-06-14


Citation Information: High Temperature Materials and Processes, Volume 32, Issue 3, Pages 275–280, ISSN (Online) 2191-0324, ISSN (Print) 0334-6455, DOI: https://doi.org/10.1515/htmp-2012-0138.

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©[2013] by Walter de Gruyter Berlin Boston.Get Permission

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