Aluminum-containing intergranular phases in hot-pressed silicon carbide

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Aluminum-containing intergranular phases, forming intergranular films and secondary phase particles at triple-junctions in SiC hot-pressed with aluminum, boron, and carbon additions, were studied by transmission electron microscopy. Statistical high-resolution electron microscopy study of intergranular films indicated that a large fraction of the vitreous intergranular films in the s-hot-pressed SiC crystallized during postannealing in argon above 1000 C. However, brief heating to 1900 C indeed re-melted 25 percent of the crystallized intergranular films. The structural transitions were reflected in the statistical width distributions of the amorphous grain boundary layers. At triple-junctions, Al2O3, Al2OC-SiC solid solution, and mullite phases were newly identified. ... continued below

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Zhang, Xiao Feng & De Jonghe, Lutgard C. January 12, 2003.

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Aluminum-containing intergranular phases, forming intergranular films and secondary phase particles at triple-junctions in SiC hot-pressed with aluminum, boron, and carbon additions, were studied by transmission electron microscopy. Statistical high-resolution electron microscopy study of intergranular films indicated that a large fraction of the vitreous intergranular films in the s-hot-pressed SiC crystallized during postannealing in argon above 1000 C. However, brief heating to 1900 C indeed re-melted 25 percent of the crystallized intergranular films. The structural transitions were reflected in the statistical width distributions of the amorphous grain boundary layers. At triple-junctions, Al2O3, Al2OC-SiC solid solution, and mullite phases were newly identified. These phases,together with others reported before are represented in a quaternary phase diagram for 1900 C. It is proposed that a SiC-Al2OC liquid domain is to be included in this phase diagram.

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  • Other Information: Journal Publication Date: 08/2004

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  • Report No.: LBNL--54402
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 842749
  • Archival Resource Key: ark:/67531/metadc784991

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  • January 12, 2003

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  • Dec. 3, 2015, 9:30 a.m.

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  • June 15, 2016, 1:14 p.m.

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Zhang, Xiao Feng & De Jonghe, Lutgard C. Aluminum-containing intergranular phases in hot-pressed silicon carbide, article, January 12, 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc784991/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.