Reaction Sintering of AlMg-MgO for the Production of MgAl2O4-Spinel-Based Composite Ceramics

Reaction sintering is presented as a new process to produce AlMg spinel‐based ceramics. High oxidation yields of the metallic precursor and full homogenization to single‐phase MgAl2O4‐ceramics are achieved. Five process stages are distinguished and characterized with particular emphasis on the wetti...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2005-03, Vol.88 (3), p.553-559
Main Authors: Kuntz, Meinhard, Dierkes, Stephan, Grathwohl, Georg
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Miscellaneous
Other materials
Physics
Specific materials
Technical ceramics
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Summary:Reaction sintering is presented as a new process to produce AlMg spinel‐based ceramics. High oxidation yields of the metallic precursor and full homogenization to single‐phase MgAl2O4‐ceramics are achieved. Five process stages are distinguished and characterized with particular emphasis on the wetting stage of molten alloy on MgO. If the onset of wetting is efficiently controlled extremely high oxidation rates and full oxidation yields near 100% are reached at moderate temperatures up to 1000°C. The resulting microstructure is generated without any ongoing shrinkage and it can be characterized by its closed porosity, which suggests the production of gastight porous fittings and components.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2005.00124.x