Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 22, Issue 8, Pages 1347-1355Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0955-2219(01)00438-1
Keywords
gas pressure sintering; gelcasting; mechanical properties; powders-pretreatment; pressing; Si3N4
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In this study, the preparation Of Si3N4 ceramics with high mechanical reliability is investigated. The influences of several processing steps on the bending strength and the Weibull modulus are reported including: (i) coating of the Si3N4 powder with its sintering aids, (ii) oxidation of the coated powder, (iii) cold isostatic pressing, (iv) gelcasting of the green bodies and (v) gas pressure sintering. It was found that all the aforementioned steps contribute to improvements of strength and reliability Of Si3N4 ceramics. Via an optimised processing strategy, Si3N4 ceramics with a bending strength and a Weibull modulus as high as 944.7 +/- 29.5 MPa and 33.9, respectively, could be prepared. Additionally, it was also found that surface modifications, i.e. coating and oxidation of Si3N4 powder, increased the rheological properties of the powder suspension in aqueous media, which is favourable for in situ colloidal forming such as gelcasting. (C) 2002 Elsevier Science Ltd. All rights reserved.
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