A mechanism for reactive diffusion between Si single crystal and NbC powder compact

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Title:	A mechanism for reactive diffusion between Si single crystal and NbC powder compact
Authors:	Kao,CR;Woodford,J;Chang,YA
Contributors:	化學工程與材料工程學系
Keywords:	STATE DISPLACEMENT REACTION;SOLID-STATE
Date:	1996
Issue Date:	2010-06-29 17:31:43 (UTC+8)
Publisher:	中央大學
Abstract:	Based on our recent experimental observations, a growth mechanism for the reactive diffusion between Si single crystal and NbC powder compact is proposed. In Si-NbC diffusion couples annealed at 1300 degrees C, a two-phase NbSi2 + SiC reaction layer formed with NbSi2 as the matrix and SiC as discontinuous particles. The NbSi2 grain sizes and SiC particle sizes are both in the mu m range. We propose that the SiC particles nucleated at the void surfaces in the NbC powder compact. This proposed nucleation mechanism offers a potential way of controlling the SiC particle size by changing the void size and void density of the NbC powder compact. It is also pointed out that this microstructure requires Si to be the dominant diffusing species. Si must diffuse through the reaction layer, while C only has to undergo local rearrangement, and Nb need not diffuse at all.
Relation:	JOURNAL OF MATERIALS RESEARCH
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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