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Titolo:
Microstructure and high-temperature internal friction of unidirectionally solidified Al2O3/YAG eutectic composite
Autore:
Takata, S; Ueno, S; Kawakami, Y; Akatsu, T; Tanabe, Y; Yasuda, E; Waku, Y;
Indirizzi:
Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan Tokyo Inst Technol Yokohama Kanagawa Japan 2268503 anagawa 2268503, Japan Japan Ultra High Temp Mat Res Inst, Ube, Yamaguchi 755001, Japan Japan Ultra High Temp Mat Res Inst Ube Yamaguchi Japan 755001 5001, Japan
Titolo Testata:
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
fascicolo: 6, volume: 109, anno: 2001,
pagine: 561 - 564
SICI:
0914-5400(200106)109:6<561:MAHIFO>2.0.ZU;2-U
Fonte:
ISI
Lingua:
JPN
Soggetto:
YTTRIUM-ALUMINUM-GARNET; MATRIX COMPOSITES; SAPPHIRE; BEHAVIOR; CERAMICS; CREEP; YAG;
Keywords:
Al2O3/YAG eutectic composite; high-temperature internal friction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Takata, S Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, 4259 Nagatsuta,Yokohama,Kanagawa 2268503, Japan Tokyo Inst Technol 4259 Nagatsuta Yokohama Kanagawa Japan 2268503
Citazione:
S. Takata et al., "Microstructure and high-temperature internal friction of unidirectionally solidified Al2O3/YAG eutectic composite", J CERAM S J, 109(6), 2001, pp. 561-564

Abstract

High-temperature internal friction of unidirectionally solidified Al2O3/YAG eutectics and sintered Al2O3/YAG composites were examined up to 1400 degreesC in an ambient atmosphere, in comparison with Al2O3 single-crystal, Theinternal friction for all samples slightly increases with increasing temperature at above 1000 degreesC, The internal friction of the sintered spcimen at 1400 degreesC was about seven times higher than that of the unidirectionally solidified one. The internal friction of unidirectionally solidifiedcomposite was slightly higher than that of Al2O3 single-crystal, The difference in internal friction values among these samples strongly depends on the Al2O3/YAG interfacial area per unit volume and may also be related to the characteristic of the grain boundary, The apparent activation energy calculated from the slope of Arrhenius plots was 180, 110, and 110 kJ/mol for the sintered composite, the unidirectionally solidified Al2O3/YAG eutectic composite, and the Al2O3 single-crystal, respectively. The internal frictionvalues at each temperature and/or the apparent activation energy for unidirectionally solidified Al2O3/YAG eutectic composite and Al2O3 single-crystal are almost the same, which implies composite behaving as a material having no-interface. The shear modulus for all the tested samples gradually decreased with increasing temperature.

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Documento generato il 29/03/20 alle ore 15:17:23