Silicon Carbide Whiskers Interference on Silicon Nitride Based Composite

Abstract:

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Silicon nitride based composite has been prepared, using a direct mixture process as alternative route. Silicon carbide whiskers were mixed directly to silicon nitride based powders containing yttrium and neodymium oxide as sintering aids. Uniaxial hot pressing was used to prepare sintered samples. Crystalline phases were identified using x-ray diffractometry. Intergranular phases were analyzed using Scanning Electron Microscopy. Some mechanical properties (microhardness and fracture toughness) were also evaluated. The obtained high values of fracture toughness were correlated to the activation of toughening mechanisms, such as crack bridging and crack deflection.

Info:

Periodical:

Materials Science Forum (Volumes 591-593)

Edited by:

Lucio Salgado and Francisco Ambrozio Filho

Pages:

543-547

DOI:

10.4028/www.scientific.net/MSF.591-593.543

Citation:

S. A. Baldacim et al., "Silicon Carbide Whiskers Interference on Silicon Nitride Based Composite", Materials Science Forum, Vols. 591-593, pp. 543-547, 2008

Online since:

August 2008

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Price:

$35.00

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