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Titolo:
PREPARATION OF ULTRAFINE ALN PARTICLES WITH HEXAGONAL PRISM SHAPE BY REACTION BETWEEN NITROGEN PLASMA AND MOLTEN AL-Y ALLOYS
Autore:
YAMAGUCHI T; INOUE A; NOSAKI K; NAKANE H;
Indirizzi:
YOSHIDA KOGYO KK,DIV RES & DEV KUROBE 938 JAPAN TOHOKU UNIV,INST MAT RES SENDAI MIYAGI 98077 JAPAN
Titolo Testata:
Materials transactions, JIM
fascicolo: 8, volume: 35, anno: 1994,
pagine: 538 - 542
SICI:
0916-1821(1994)35:8<538:POUAPW>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Keywords:
ULTRAFINE PARTICLE; HEXAGONAL AIN; HEXAGONAL PRISM SHAPE; NITROGEN PLASMA REACTION; PREALLOYED ALUMINUM-YTTRIUM INGOT; COMPOSITE ALY-YN PARTICLE; NANOSCALE YN PARTICLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
5
Recensione:
Indirizzi per estratti:
Citazione:
T. Yamaguchi et al., "PREPARATION OF ULTRAFINE ALN PARTICLES WITH HEXAGONAL PRISM SHAPE BY REACTION BETWEEN NITROGEN PLASMA AND MOLTEN AL-Y ALLOYS", Materials transactions, JIM, 35(8), 1994, pp. 538-542

Abstract

Ultrafine AlN particles with a hexagonal prism shape were formed at high production ratios exceeding 90% by the reaction between nitrogen plasma and molten Al50Y50 alloy in the mixing N-2+4%H-2 gas of 40 kPa. The diameter and the length of the AlN particles are about 50 and 200 nm, respectively. The existence of YN particles with a size of about 5nm is often observed in the AlN particles. The high production ratio and the unique morphology for the AlN particles are significantly different from the low production ratio of about 30% and the hexagonal plate shape for the AlN particles obtained from pure Al ingots by the same fabrication technique. The increase in the production ratio by the use of the Al-Y alloy is presumably due to the increase in the dissolution amount of N-2 in the liquid resulting from the dissolution of the Y atom with an atomic size larger than Al and a large negative heat ofmixing against N-2. Furthermore, the achievement of the unique particle morphology is presumed to reflect the change in the preferential growth direction to the [0001] direction resulting from the preferentialoccupation of Y at the sites with a loose atomic configuration along the direction which is perpendicular to the basal (0001) plane with a more dense atomic configuration.

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Documento generato il 28/03/20 alle ore 23:23:09