Chemical reactions in the system Si3N4-SiO2-B2O3

Document identifier: oai:DiVA.org:ltu-7585
Access full text here:10.1016/S0955-2219(97)00188-X
Keyword: Engineering and Technology, Materials Engineering, Other Materials Engineering, Teknik och teknologier, Materialteknik, Annan materialteknik, Material Mechanics, Materialmekanik
Publication year: 1998
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Abstract:

Chemical interactions in the system of silicon nitride with borosilicate glass have been studied as part of an evaluation of glass encapsulated HIP. Theoretical calculations have been performed to predict the thermodynamically stable phases under conditions reflecting different stages in a HIP-cycle. Experimental studies were made on heat treated mixtures of the silicon nitride and the silicate glass. These samples were evaluated with X-ray diffraction. At temperatures commonly used for densification, the system reacted to BN and Si2N2O in agreement with the theoretical calculations. At typical temperatures for pressure application no chemical reactions could be detected but the theoretical calculations showed that BN and, for larger amount of silicon nitride, also silicon oxynitride were stable. Minor amounts of the phases may have formed or non-equilibrium conditions could be explanations for the absence of the expected phases

Authors

Anna-Karin Westman

Luleå tekniska universitet; Institutionen för teknikvetenskap och matematik
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Stefan Forsberg

Avdelningen för oorganisk kemi, Umeå universitet
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Hans T. Larker

Luleå tekniska universitet
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