Proposal of Atomic Models for Formation Process of Carbonitride W(C,N) Synthesized by Normal- and High-pressure Methods
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- Tanaka Kazuhiko
- Institute of Industrial Science, The University of Tokyo
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- Asada Nobuaki
- Allied Material Corp. Ltd.
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- Hayashi Koji
- Institute of Industrial Science, The University of Tokyo
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Abstract
The syntheses of new mono-carbonitrides of W and/or Mo, i.e., W(C, N), Mo(C, N) and (W, Mo)(C, N), which are thermodynamically unable to be generated by using nitrogen gas of normal pressure, have been succeeded by the authors by using CH4+NH3 mixed gas of normal pressure (normal-pressure method) and C powder+nitrogen gas of high pressure (high-pressure method). The formations of these mono-carbonitrides as well as of general compounds by those methods have been explained by applying traditional Ostwald's step rule and virtual-pressure concept for normal-pressure method, and Le Chatelier's principle for high-pressure method, respectively. These explanations, however, are based only on the macroscopic level, but not on the atomic level.<BR>In this paper, we newly proposed atomic models for the formation process of W(C, N) in both normal- and high-pressure methods, mainly based on the previous experimental results. The models include the concepts of "nascent atoms" and "nitrogen molecular cluster in supercritical fluid", etc., respectively.
Journal
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- Journal of the Japan Society of Powder and Powder Metallurgy
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Journal of the Japan Society of Powder and Powder Metallurgy 50 (7), 534-544, 2003
Japan Society of Powder and Powder Metallurgy
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Details 詳細情報について
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- CRID
- 1390001206307448704
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- NII Article ID
- 10011242418
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- NII Book ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL BIB ID
- 6654475
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed