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Densification behaviour of oxide-coated silicon nitride powders

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

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Abstract

Powder coating has been explored as a method of incorporating sintering additives into a ceramic powder. This procedure has been explored in the case of Si3N4 powders coated with thin layers of MgO. The effectiveness of the powder coating technique has been evaluated by comparing the powder properties, densification behaviour, microstructure and mechanical properties of coated Si3N4 powders with identical powders in which the additive oxide has been added in particulate form. It is concluded that the powder coating technique is an excellent method of homogeneously incorporating minor amounts of sintering additive into a powder. The coated powder exhibited improved homogeneity, and gave good green compact density, high green strength, and faster densification rate. Moreover, coated powders densified more easily by pressureless sintering and showed a more homogeneous microstructure, higher strength and faster densification rates, compared with materials prepared using mixed oxide powders. Significant improvements in hardness and fracture toughness were observed for the coated powders. © 2005 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Tatli Z, Thompson DP

Publication type: Article

Publication status: Published

Journal: Materials Letters

Year: 2005

Volume: 59

Issue: 14-15

Pages: 1897-1901

ISSN (print): 0167-577X

ISSN (electronic): 1873-4979

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.matlet.2005.02.006

DOI: 10.1016/j.matlet.2005.02.006

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