Effect of nano-sized SiC and micro-sized YAG dispersion on the microstructure of alumina

Byungkoog Jang, Teruo Kishi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Alumina-based ceramic composites prepared by participate dispersion using SiC and Y2O3 as additives were studied under hot-pressing at 1400 to 1600°C for 0 to 20h. An yttrium aluminum garnet (YAG, Y3Al5O12) phase was formed by the reaction between Al2O3 and Y2O3 above at 1400°C after 10 min of hot-pressing, and dense Al2O3/5 vol%SiC/20 vol%YAG composites resulted. The YAG phase was dispersed at the grain boundary of the Al2O3 matrix with equiaxed grains. Fine SiC was dispersed uniformly within the Al2O3 matrix, whereas coarse SiC particulates, which showed stacking faults, were located in the grain boundaries between the Al2O3 and YAG. The YAG phase was bonded directly to the Al2O3. An impurity phase, which apparently was amorphous, could be detected at the interface between the Al2O3 and SiC. The grain size of the monolithic Al2O3 increased remarkably with increases in hot-pressing temperature and time; grain growth in the Al2O3/SiC/YAG composites were effectively restrained, and those samples exhibited a narrower grain size distribution. This uniformly fine microstructure could be attributed to the incorporation of the YAG and SiC particulates, because of grain boundary pinning by the particulates.

Original languageEnglish
Pages (from-to)138-143
Number of pages6
JournalJournal of the Ceramic Society of Japan
Volume106
Issue number2
Publication statusPublished - Jan 1 1998

Fingerprint

Aluminum Oxide
Hot pressing
yttrium-aluminum garnet
Grain boundaries
Alumina
aluminum oxides
microstructure
Microstructure
Composite materials
hot pressing
Garnets
Stacking faults
Yttrium
particulates
Grain growth
grain boundaries
Impurities
composite materials
Aluminum
grain size

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

Effect of nano-sized SiC and micro-sized YAG dispersion on the microstructure of alumina. / Jang, Byungkoog; Kishi, Teruo.

In: Journal of the Ceramic Society of Japan, Vol. 106, No. 2, 01.01.1998, p. 138-143.

Research output: Contribution to journalArticle

@article{9b4c81bbf72e4fec99f2b093f1f053a1,
title = "Effect of nano-sized SiC and micro-sized YAG dispersion on the microstructure of alumina",
abstract = "Alumina-based ceramic composites prepared by participate dispersion using SiC and Y2O3 as additives were studied under hot-pressing at 1400 to 1600°C for 0 to 20h. An yttrium aluminum garnet (YAG, Y3Al5O12) phase was formed by the reaction between Al2O3 and Y2O3 above at 1400°C after 10 min of hot-pressing, and dense Al2O3/5 vol{\%}SiC/20 vol{\%}YAG composites resulted. The YAG phase was dispersed at the grain boundary of the Al2O3 matrix with equiaxed grains. Fine SiC was dispersed uniformly within the Al2O3 matrix, whereas coarse SiC particulates, which showed stacking faults, were located in the grain boundaries between the Al2O3 and YAG. The YAG phase was bonded directly to the Al2O3. An impurity phase, which apparently was amorphous, could be detected at the interface between the Al2O3 and SiC. The grain size of the monolithic Al2O3 increased remarkably with increases in hot-pressing temperature and time; grain growth in the Al2O3/SiC/YAG composites were effectively restrained, and those samples exhibited a narrower grain size distribution. This uniformly fine microstructure could be attributed to the incorporation of the YAG and SiC particulates, because of grain boundary pinning by the particulates.",
author = "Byungkoog Jang and Teruo Kishi",
year = "1998",
month = "1",
day = "1",
language = "English",
volume = "106",
pages = "138--143",
journal = "Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan",
issn = "1882-0743",
publisher = "Ceramic Society of Japan/Nippon Seramikkusu Kyokai",
number = "2",

}

TY - JOUR

T1 - Effect of nano-sized SiC and micro-sized YAG dispersion on the microstructure of alumina

AU - Jang, Byungkoog

AU - Kishi, Teruo

PY - 1998/1/1

Y1 - 1998/1/1

N2 - Alumina-based ceramic composites prepared by participate dispersion using SiC and Y2O3 as additives were studied under hot-pressing at 1400 to 1600°C for 0 to 20h. An yttrium aluminum garnet (YAG, Y3Al5O12) phase was formed by the reaction between Al2O3 and Y2O3 above at 1400°C after 10 min of hot-pressing, and dense Al2O3/5 vol%SiC/20 vol%YAG composites resulted. The YAG phase was dispersed at the grain boundary of the Al2O3 matrix with equiaxed grains. Fine SiC was dispersed uniformly within the Al2O3 matrix, whereas coarse SiC particulates, which showed stacking faults, were located in the grain boundaries between the Al2O3 and YAG. The YAG phase was bonded directly to the Al2O3. An impurity phase, which apparently was amorphous, could be detected at the interface between the Al2O3 and SiC. The grain size of the monolithic Al2O3 increased remarkably with increases in hot-pressing temperature and time; grain growth in the Al2O3/SiC/YAG composites were effectively restrained, and those samples exhibited a narrower grain size distribution. This uniformly fine microstructure could be attributed to the incorporation of the YAG and SiC particulates, because of grain boundary pinning by the particulates.

AB - Alumina-based ceramic composites prepared by participate dispersion using SiC and Y2O3 as additives were studied under hot-pressing at 1400 to 1600°C for 0 to 20h. An yttrium aluminum garnet (YAG, Y3Al5O12) phase was formed by the reaction between Al2O3 and Y2O3 above at 1400°C after 10 min of hot-pressing, and dense Al2O3/5 vol%SiC/20 vol%YAG composites resulted. The YAG phase was dispersed at the grain boundary of the Al2O3 matrix with equiaxed grains. Fine SiC was dispersed uniformly within the Al2O3 matrix, whereas coarse SiC particulates, which showed stacking faults, were located in the grain boundaries between the Al2O3 and YAG. The YAG phase was bonded directly to the Al2O3. An impurity phase, which apparently was amorphous, could be detected at the interface between the Al2O3 and SiC. The grain size of the monolithic Al2O3 increased remarkably with increases in hot-pressing temperature and time; grain growth in the Al2O3/SiC/YAG composites were effectively restrained, and those samples exhibited a narrower grain size distribution. This uniformly fine microstructure could be attributed to the incorporation of the YAG and SiC particulates, because of grain boundary pinning by the particulates.

UR - http://www.scopus.com/inward/record.url?scp=0032000221&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032000221&partnerID=8YFLogxK

M3 - Article

VL - 106

SP - 138

EP - 143

JO - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan

JF - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan

SN - 1882-0743

IS - 2

ER -