Thermodynamic studies on the AlN sintering powders treated with phosphate species
authors Olhero, SM; Jensen, ZS; Einarsud, MA; Grande, T; Ferreira, JMF
nationality International
journal JOURNAL OF THE AMERICAN CERAMIC SOCIETY
keywords THERMAL-CONDUCTIVITY; ALUMINUM NITRIDE; MICROSTRUCTURAL CHARACTERIZATION; ALN(Y2O3) CERAMICS; AQUEOUS-MEDIA; CARBON; PHASE; ATMOSPHERE; BEHAVIOR; YF3
abstract The processing of aluminum nitride (AlN) ceramics in aqueous media requires the use of a surface layer to protect the surface of the particles against hydrolysis. This surface layer might influence the densification, affecting the reactions between AlN and sintering additives. The present paper describes a thermodynamic and experimental approach to evaluate the effects of a phosphate-based protecting surface layer on the densification of AlN in the presence of YF3-CaF2 as sintering aids, and to predict the densification behavior during sintering using thermodynamic assessments. Based on thermodynamic calculations and the measured weight loss of the samples during heating to sintering temperature, the chemical reactions occurring during firing were proposed. The proposed reactions were related to the experimental results as well as the final properties of the AlN samples, namely, thermal conductivity, microstructure, secondary phases, and density.
publisher BLACKWELL PUBLISHING
issn 0002-7820
year published 2007
volume 90
issue 11
beginning page 3589
ending page 3595
digital object identifier (doi) 10.1111/j.1551-2916.2007.01922.x
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000250762100034
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journal analysis (jcr 2019):
journal impact factor 3.502
5 year journal impact factor 3.475
category normalized journal impact factor percentile 91.071
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