Effects of Y₂O₃addition and sintering time on densification and thermal  conductivity of AlN ceramics during hot-press sintering

채재홍; 박주석; 안종필; 김경훈; 이병하

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자료유형: 학술저널

저자정보: 채재홍 박주석 안종필 김경훈 이병하

저널정보: 한국결정성장학회 한국결정성장학회지 한국결정성장학회지 제18권 제6호

발행연도: 2008.1

수록면: 237 - 241 (5page)

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Hot-press sintering of AlN ceramics were carried out with Y₂O₃as sintering additive at a sintering temperature 1,750~1,850℃. The effect of Y₂O₃addition and sintering time on sintering behavior and thermal conductivity of AlN ceramics was investigated. Y₂O₃added AlN showed noticeably higher densification rate than pure AlN. The thermal conductivity of AlN specimens was promoted by the addition of Y₂O₃in spite of the formation of YAG secondary phase in AlN grain boundaries and grain boundary triple junction because Y₂O₃addition could reduced the oxygen contents in AlN lattice which is primary factor of thermal conductivity. Typically, the thermal conductivity of 5 wt% Y₂O₃added specimen was dramatically improved by the increase of sintering time because the elimination of YAG secondary phases from the grain boundary due to the evaporation, as well as the grain-growth of AlN grains.

#Aluminum nitride #Yttria #Thermal conductivity #Sintering

참고문헌 (14)

참고문헌 신청

A.V. Virkar / 1989 / Thermodynamic and kinetic effects of oxygen removal on the thermal conductivity of aluminum nitride / J. Am. Ceram. Soc 72 : 2031 ~

G. Pezzotti / 2000 / Effect of extended annealing cycles on the thermal conductivity of AlN/Y2O3 ceramics / J. Euro. Ceram. Soc 20 : 1319 ~

G.A. Slack / 1973 / Nonmetallic crystals with high thermal conductivity / J. Phys. Chem. Solids 34 : 321 ~

K. Komeya / 1974 / Role of Y2O3 and SiO2 additions in sintering of AlN / J. Am. Ceram. Soc 54 : 411 ~

K. Komeya / 1985 / Effect of various additives on sintering of aluminum nitride / Yogyo- Kyokaishi 93 : 41 ~

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