Porosity dependence of elastic constants in aluminum nitride ceramics
Aluminum nitride is a relatively new engineering ceramic and its mechanical properties have not been extensively studied. In this work, the effects of porosity (~0 to 38%) on sonic velocities, Poisson's ratio, and elastic moduli of partially sintered A1N, both pure and with additives, were inve...
Main Authors: | , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2007-06-01
|
Series: | Materials Research |
Subjects: | |
Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000200006 |
id |
doaj-f0cd8c8386ba4ca8b105be5d446396f1 |
---|---|
record_format |
Article |
spelling |
doaj-f0cd8c8386ba4ca8b105be5d446396f12020-11-24T23:29:33ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392007-06-0110212713310.1590/S1516-14392007000200006Porosity dependence of elastic constants in aluminum nitride ceramicsHumberto Naoyuki YoshimuraAndré Luiz MolisaniNilson Eiji NaritaPaulo Francisco CesarHélio GoldensteinAluminum nitride is a relatively new engineering ceramic and its mechanical properties have not been extensively studied. In this work, the effects of porosity (~0 to 38%) on sonic velocities, Poisson's ratio, and elastic moduli of partially sintered A1N, both pure and with additives, were investigated. The elastic constants, determined by the ultrasonic pulse-echo method, were significantly influenced by the porosity, but not by the different types of additives used (2 wt. (%) of CaCO3, CaO, and Y2O3). All elastic constants evaluated decreased with increasing porosity, but the rates of decrease were higher for elastic moduli compared do sonic velocities and Poisson's ratio. The results were analyzed in the light of stress concentration and loading bearing area models proposed in the literature.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000200006aluminum nitrideporous materialelastic behaviorsintering |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Humberto Naoyuki Yoshimura André Luiz Molisani Nilson Eiji Narita Paulo Francisco Cesar Hélio Goldenstein |
spellingShingle |
Humberto Naoyuki Yoshimura André Luiz Molisani Nilson Eiji Narita Paulo Francisco Cesar Hélio Goldenstein Porosity dependence of elastic constants in aluminum nitride ceramics Materials Research aluminum nitride porous material elastic behavior sintering |
author_facet |
Humberto Naoyuki Yoshimura André Luiz Molisani Nilson Eiji Narita Paulo Francisco Cesar Hélio Goldenstein |
author_sort |
Humberto Naoyuki Yoshimura |
title |
Porosity dependence of elastic constants in aluminum nitride ceramics |
title_short |
Porosity dependence of elastic constants in aluminum nitride ceramics |
title_full |
Porosity dependence of elastic constants in aluminum nitride ceramics |
title_fullStr |
Porosity dependence of elastic constants in aluminum nitride ceramics |
title_full_unstemmed |
Porosity dependence of elastic constants in aluminum nitride ceramics |
title_sort |
porosity dependence of elastic constants in aluminum nitride ceramics |
publisher |
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
series |
Materials Research |
issn |
1516-1439 |
publishDate |
2007-06-01 |
description |
Aluminum nitride is a relatively new engineering ceramic and its mechanical properties have not been extensively studied. In this work, the effects of porosity (~0 to 38%) on sonic velocities, Poisson's ratio, and elastic moduli of partially sintered A1N, both pure and with additives, were investigated. The elastic constants, determined by the ultrasonic pulse-echo method, were significantly influenced by the porosity, but not by the different types of additives used (2 wt. (%) of CaCO3, CaO, and Y2O3). All elastic constants evaluated decreased with increasing porosity, but the rates of decrease were higher for elastic moduli compared do sonic velocities and Poisson's ratio. The results were analyzed in the light of stress concentration and loading bearing area models proposed in the literature. |
topic |
aluminum nitride porous material elastic behavior sintering |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000200006 |
work_keys_str_mv |
AT humbertonaoyukiyoshimura porositydependenceofelasticconstantsinaluminumnitrideceramics AT andreluizmolisani porositydependenceofelasticconstantsinaluminumnitrideceramics AT nilsoneijinarita porositydependenceofelasticconstantsinaluminumnitrideceramics AT paulofranciscocesar porositydependenceofelasticconstantsinaluminumnitrideceramics AT heliogoldenstein porositydependenceofelasticconstantsinaluminumnitrideceramics |
_version_ |
1725545104674914304 |