The influence of Y2O3-containing sintering additives on the oxidation of Si3N4-based ceramics and the interfacial interactions with liquid Al-alloys
authors Oliveira, M; Agathopoulos, S; Ferreira, JMF
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords inter-faces; microstructure; Si3N4; oxidation; aluminium alloys
keywords SILICON-NITRIDE CERAMICS; TRANSMISSION ELECTRON-MICROSCOPY; NONOXIDE CERAMICS; MOLTEN ALUMINUM; CHEMISTRY; STRENGTH; MECHANISMS; CORROSION; SI3N4; DENSE
abstract Sintering additives containing Y2O3 influence the microstructure and the crystalline-state of Si3N4-ceramics produced via pressureless sintering, and determine their response towards oxidation. Y2SiO5 and Y2Si2O7 were formed after sintering and oxidation, respectively. The superficial layers formed after oxidation are thinner and formed faster on the surface of the compositions 90Si(3)N(4)-5Y(2)O(3)-5Al(2)O(3) and 90Si(3)N(4)-5Y(2)O(3)-5AlN than on 90Si(3)N(4)-5Y(2)O(3)-2.5Al(2)O(3)-2.5AlN (in wt.%). The 90Si(3)N(4)-5Y(2)O(3)-5Al(2)O(3)/liquid Al interface features strong interfacial adhesion while mild diffusion should govern the interfacial interactions. Compounds, whose formation results from the yttria-containing sintering aids, such as yttrium aluminates, should act as diffusion barriers at the ceramic/liquid metal interface. The experimental results indicate attractive features for applications in both Al-foundry industry and production of Si3N4-Al composites. (C) 2004 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2005
volume 25
issue 1
beginning page 19
ending page 28
digital object identifier (doi) 10.1016/j.jeurceramsoc.2004.03.021
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000225427400003
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journal impact factor 4.495
5 year journal impact factor 4.283
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