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Effects of Si and Mg dopants on the kinetics of aluminum alloys nitridation

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1016/B978-0-08-037298-3.50034-7
AuthorSearch for: 1; Search for: 1
Affiliation
  1. National Research Council of Canada
FormatText, Book Chapter
ConferenceThe International Symposium on Advances in Processing of Ceramic and Metal Matrix Composites, August 20–24, 1989, Halifax, Nova Scotia, Canada
Subjectceramic-metal matrix composite; liquid aluminum nitridation; magnesium-silicon dopants; thermal balance; X-ray diffraction
Abstract
Combustion reactions of molten aluminum alloys with nitrogen atmosphere have been carried out to determine to what extend dense Al/AIN composites could be obtained. The present paper describes the effects of dopants such as Si and Mg on the kinetics of aluminum nitridation. A micro-thermal balance with a heating temperature up to 1500°C was used to measure the sample weight gain as aluminum was converted to aluminum nitride. Microstructural analyses of reaction products revealed that a columnar aluminum/aluminum nitride structure has grown outward from the metal surface. The reaction kinetics are complex, particularly in the temperature range of 900-1300°C. The overall weight gain involves not only the nitridation reaction but also the movement of molten metal to the reaction surface. It was found that dopants sustained the reaction by altering the surface area of the growth front. In optimal conditions, the complete conversion of Al into A1N could be achieved in an hour.
Publication date
PublisherElsevier
In
  • Processing of Ceramic and Metal Matrix Composites: Proceedings of the International Symposium on Advances in Processing of Ceramic and Metal Matrix Composites, Halifax, August 20–24, 1989: 302–311.
LanguageEnglish
Peer reviewedYes
NRC numberNRCC 30127
NRC-IGM89TC-301-851-G
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