Paper Title:

Silicon Carbide Whiskers Interference on Silicon Nitride Based Composite

Periodical Materials Science Forum (Volumes 591 - 593)
Main Theme Advanced Powder Technology VI
Edited by Lucio Salgado and Francisco Ambrozio Filho
Pages 543-547
DOI 10.4028/www.scientific.net/MSF.591-593.543
Citation Sandro Aparecido Baldacim et al., 2008, Materials Science Forum, 591-593, 543
Online since August, 2008
Authors Sandro Aparecido Baldacim, Claudinei dos Santos, Olivério Moreira Macedo Silva, Cosme Roberto Moreira Silva
Keywords Ceramic Composite, Rare Earth Concentrate, Sintering Additive
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Abstract

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.