Strength improvement of LPS-SiC ceramics by oxidation treatment
| Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
|---|---|
| Data(s) |
18/10/2012
18/10/2012
2010
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| Resumo |
In this work, SiC ceramics were liquid phase sintered (LPS), using AIN-Y(2)O(3) as additives, and oxidized at 1400 degrees C in air for up to 120 h. Oxidation was monitored by the weight gain of the samples as function of exposition time and temperature. A parabolic growth of the oxidation layer has been observed and the coefficient of the growth rate has been determined by relating the weight gain and the surface area. The effect of oxidation on strength has been determined by 4-point bending tests. Phase analysis by Xray diffraction and microstructural observation by scanning electron microscopy indicated the formation of a uniform and dense oxidation layer. The elimination of surface flaws and pores and the generation of compressive stresses in the surface resulted in a strength increase of the oxidized samples. (C) 2009 Published by Elsevier Ltd. CAPES CNPq FAPESP |
| Identificador |
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, v.28, n.4, p.484-488, 2010 0263-4368 http://producao.usp.br/handle/BDPI/17649 10.1016/j.ijrmhm.2009.08.004 |
| Idioma(s) |
eng |
| Publicador |
ELSEVIER SCI LTD |
| Relação |
International Journal of Refractory Metals & Hard Materials |
| Direitos |
closedAccess Copyright ELSEVIER SCI LTD |
| Palavras-Chave | #Silicon carbide #Oxidation #Parabolic growth rate #Bending strength #SILICON-CARBIDE #MECHANICAL-PROPERTIES #MICROSTRUCTURAL DEVELOPMENT #PHASE-TRANSFORMATION #BEHAVIOR #ADDITIVES #POROSITY #Materials Science, Multidisciplinary #Metallurgy & Metallurgical Engineering |
| Tipo |
article original article publishedVersion |
