Title: Densification and crystallisation behaviour of barium magnesium aluminosilicate glass powder compacts
Authors: Lambrinou, K. ×
Van der Biest, Omer
Boccaccini, A.R.
Taplin, D.M.R. #
Issue Date: 1996
Publisher: Elsevier Science Publishers
Series Title: Journal of the European Ceramic Society vol:16 issue:11 pages:1237-1244
Abstract: The densification and crystallisation of barium magnesium aluminosilicate (BMAS) glass powder has been investigated The aim of the study was to draw conclusions of value for the optimisation of the processing parameters for BMAS matrix ceramic composites. Pressureless sintering and hot-pressing techniques were investigated. The pressureless densification behaviour of cold-uniaxially pressed compacts was determined at isothermal and constant heating rate conditions using a high temperature microscope. The samples could be densified isothermally to full density at 930 degrees C prior to the onset of crystallisation. For compacts sintered at constant heating rates between 800 and 1100 degrees C, it was found that the simultaneous occurrence of crystallisation and densification strongly depends on the heating rate. Using hot-pressing (pressure = 20 MPa) results in full densification in the amorphous state after 1 hour at 925 degrees C. X-ray diffraction analysis was used to characterise the crystallinity of pressureless sintered and hot-pressed samples that were fabricated at temperatures between 850 degrees and 1300 degrees C. The crystallisation behaviour did not change, in qualitative terms, with the pressure applied during her-pressing. Combination of the densification and crystallisation results demonstrated that the BMAS glass can be densified completely at relatively low temperatures (930 degrees C) in the glassy state. The material can be subsequently crystallised at higher temperatures (between 1100 and 1300 degrees C) yielding a high-temperature-resistant microstructure consisting of Ba-osumilite, celsian and cordierite. Copyright (C) 1996 Elsevier Science Ltd
ISSN: 0955-2219
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physical Metallurgy and Materials Engineering Section (-)
× corresponding author
# (joint) last author

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