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Titolo:
SiCN nanocomposite: creep behaviour
Autore:
Besson, JL; Doucey, B; Lucas, S; Bahloul-Hourlier, D; Goursat, P;
Indirizzi:
ENSCI, SPCTS, F-87065 Limoges, France ENSCI Limoges France F-87065ENSCI, SPCTS, F-87065 Limoges, France Univ Limoges, SPCTS, F-87060 Limoges, France Univ Limoges Limoges FranceF-87060 oges, SPCTS, F-87060 Limoges, France
Titolo Testata:
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
fascicolo: 7, volume: 21, anno: 2001,
pagine: 959 - 968
SICI:
0955-2219(200107)21:7<959:SNCB>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPERPLASTIC SILICON-NITRIDE; PHASE-TRANSFORMATION; GLASS PHASE; ALPHA-PHASE; CERAMICS; DUCTILITY;
Keywords:
creep; nanocomposite; Si3N4; Si3N4/SiC;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Besson, JL ENSCI, SPCTS, 47 Av A Thomas, F-87065 Limoges, France ENSCI 47 Av A Thomas Limoges France F-87065 65 Limoges, France
Citazione:
J.L. Besson et al., "SiCN nanocomposite: creep behaviour", J EUR CERAM, 21(7), 2001, pp. 959-968

Abstract

The compressive creep behaviour of a Si3N4/SiC nanocomposite densified with yttria and alumina is studied in the 1115-1350 degreesC temperature rangeunder stresses from 45 to 180 MPa. The stress exponent equals 1 and the apparent activation enthalpy is 580 kJ mol(-1). Grain boundary sliding accommodated by diffusion through the intergranular glass phase is considered as the primary steady-state creep mechanism. It is argued that the diffusion step through the glass phase is the rats limiting step in the dissolution-diffusion-reprecipitation process. The results are compared with those obtained in previous studies for an alpha -Si3N4 rich monolith and a Si3N4/SiC micro-nanocomposite. The high creep deformation is explained bq the nanometric size of the Si3N4 grains and the absence of grain growth in the temperature range explored. It is showed that a post-sintering hear-treatment consisting in 5 h at 1750 degreesC followed by 3 h at 1400 degreesC enhances the creep resistance to a fair level. It is concluded that the high ductility of the as-sintered material is suitable for hot-forging whereas the subsequent heat-treatment is able to provide shaped parts with a high creep resistance for structural applications at high temperature. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 07/07/20 alle ore 18:09:12