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Low temperature densification of silicon nitride materials

Lookup NU author(s): Dr Zafer Tatli, Emeritus Professor Derek Thompson

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Abstract

Thin layers of oxides, corresponding to additions of up to 5 w/o Na2O have been deposited on the surface of grains of a commercial silicon nitride powder using alcoholic solutions containing appropriate amounts of the metal alkoxide. The resulting powders have been densified by hot pressing and pressureless sintering techniques, and their sintering characteristics identified in comparison with equivalent materials produced by adding the oxide in particulate form. In every case, a better sintering performance was observed at all temperatures for the oxide-coated materials, with ∼97% dense sintered materials being obtained at temperatures as low as 1400–1500 °C. Microstructures were observed using a S-2400 Hitachi Scanning Electron Microscope (SEM) and final microstructure was more uniform than that obtained by conventional method. It is concluded that the powder coating technique is an excellent method of homogeneously incorporating minor amounts of sintering additive into a powder.


Publication metadata

Author(s): Thompson DP; Tatli Z

Publication type: Article

Publication status: Published

Journal: Journal of the European Ceramic Society

Year: 2005

Volume: 27

Issue: 2-3

Pages: 791-795

ISSN (print): 0955-2219

ISSN (electronic): 1873-619X

Publisher: Elsevier Ltd

URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2006.04.010

DOI: 10.1016/j.jeurceramsoc.2006.04.010


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