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Lookup NU author(s): Emeritus Professor Derek Thompson
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z=1 β-Sialon starting powders which consist of 83.69 Wt.% Si 3N4, 7.80 Wt.% AlN, 8.51 Wt.% Al2O3 plus oxide additives were mixed and ball milled with isoproponal alcohol. Afterwards, the slurry was dried and sieved. The mixed β-sialon powders were hot-pressed at various temperatures and pressures. Densification behaviour of the samples were determined and x-ray analysis were carried out to find out amount of α- Si3N4 to β-sialon transformation. Densification and x-ray analysis results showed that densities and extent of α- Si3N4 to β-sialon transformation clearly both increase as the temperature increases. SEM image analyses were also carried to observe effect of pressure and heat on porosity. Above 1550°C notable densification were occurred and porosity were sharply decreased. While yttria addition was increased α-β transformation at lower temperatures, densification started at early stage by using MgO addition. Hence, each of these oxide additives was used together to achieve full densification and to complete α to β-sialon transformation.
Author(s): Demir A, Thompson DP
Editor(s): Saritas S., Uslan I., Usta Y.
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: 3rd International Powder Metallurgy Conference
Year of Conference: 2002
Pages: 438-448
Publisher: Gazi University
Library holdings: Search Newcastle University Library for this item
Sponsor(s): Turkish Powder Metallurgy Association, TPMA, Gazi University
ISBN: 9759246309
