Effects of Y2O3Addition on Densification and Thermal Conductivity of AlN Ceramics During Spark Plasma Sintering

Chae, Jae Hong; Park, Joo Seok; Ahn, Jong Pil; Kim, Kyoung Hun; Lee, Byung Ha

doi:10.4191/kcers.2008.45.1.827

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…특히, 최근 고출력 LED 조명 모듈에는 AlN 소재가 열전 도특성 이외에도 낮은 열팽창계수 및 유전손실 등의 물 성으로 방열 패키지 및 기판으로 사용하고자 하는 연구가 활발히 진행되고 있다. 10,11) 그러나, AlN의 강한 공유 결합의 특성으로 소결성이 떨 어져 완전히 치밀화된 소결체를 얻기 위해서는 1900 o C 이 상의 고온이 요구된다. AlN의 치밀화를 위해서 희토류(rareearth) 나 알카리토류(alkaline earth) 산화물을 첨가제로 사용 하게 된다.…”

Section: 서 론unclassified

Effect of High Energy Ball Milling on Sintering Behavior and Thermal Conductivity of Direct Nitrided AlN Powder

Park¹,

Kim²,

Lee³

et al. 2011

Journal of the Korean Ceramic Society

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In this study, a high energy ball milling process was introduced in order to improve the densification of direct nitrided AlN powder. The sintering behavior and thermal conductivity of the AlN milled powder was investigated. The mixture of AlN powder and 5 wt% Y 2 O 3 as a sintering additive was pulverized and dispersed by a bead mill with very small ZrO 2 bead media. The milled powders were sintered at 1700 o C-1800 o C for 4 h under N 2 atmosphere. The results showed that the sintered density was enhanced with increasing milling time due to the particle refinement as well as the increase in oxygen contents. Appropriate milling time was effective for the improvement of thermal conductivity, but the extensive millied powder formed more fractions of secondary phase during sintering, resulted in the decrease in thermal conductivity. The AlN powder milled for 10min after sintering at 1800 o C revealed the highest thermal conductivity, of 164 W/m•K in tne densified AlN sintered at 1800 o C.

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Section: 서 론unclassified

Effect of High Energy Ball Milling on Sintering Behavior and Thermal Conductivity of Direct Nitrided AlN Powder

Park¹,

Kim²,

Lee³

et al. 2011

Journal of the Korean Ceramic Society

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Fabrication and Densification Behavior Analysis of Metalizing Targets Using ZrO2 Nanopowders by Magnetic Pulsed Compaction

et al. 2011

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In this study, sintered bodies of ZrO 2 nanopowders were fabricated by combined application of magnetic pulsed compaction (MPC) and subsequent sintering and finally, their density and shrinkage were investigated. The Optimum mixing conditions of PVA, water, and TiO 2 nanopowder for compaction was found to be 1.8 mass% PVA, 10.7 mass% water, and 87.5 mass% of ZrO 2 powder at the sintered bulks. High pressure and rapid compaction using magnetic pulsed compaction (MPC), enhanced the density with increasing MPC pressure up to 3.5 GPa and significantly reduced the shrinkage rate (about 10-12% in this case) of the sintered bulks compared to the general process (about 18%).

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Joining of Y2O3-Doped Aluminum Nitride with High Density Graphite by Spark Plasma Sintering

Tsakiris¹,

Kappel²,

Velciu³

et al. 2015

AMR

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High density graphite disks and aluminum nitride ceramics powders have been utilized to obtain joints by Spark Plasma Sintering technique. The joining was carried out in vacuum, at temperatures of 1700°C, 1800°C and 1900°C, under the pressure of 50 MPa with a constant dwelling time of 5 minutes The AlN ceramics to be joined were also synthesized by ceramic technology standard route by using AlN powders and 2.5 % wt.Y2O3 powders as sintering additive, which were added in order to increase densification rate and by thus, thermal conductivity. The joining of AlN/C was performed both without and with the aid of a ceramic powder composite AlN+Y2O3+C film, as interlayer. Besides the crystalline phases (AlN and C), the Al5Y3O12 compounds with a cubic crystallographic structure were identified by X-ray diffraction. The optical microscopy images revealed that all samples, both without and with film as interlayer, had strong joined areas, without any defects and discontinuities at interfaces. The Vickers microhardness and Young Modulus values measured by nanoindentation have shown that using of the film as intermediary layer was leading to the highest values of mechanical properties (HV = 8 – 23 GPa and E= 227-512 GPa) at the AlN/C joints interfaces.

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Effects of Y₂O₃Addition on Densification and Thermal Conductivity of AlN Ceramics During Spark Plasma Sintering

Cited by 3 publications

References 9 publications

Effect of High Energy Ball Milling on Sintering Behavior and Thermal Conductivity of Direct Nitrided AlN Powder

Effect of High Energy Ball Milling on Sintering Behavior and Thermal Conductivity of Direct Nitrided AlN Powder

Fabrication and Densification Behavior Analysis of Metalizing Targets Using ZrO<SUB>2</SUB> Nanopowders by Magnetic Pulsed Compaction

Joining of Y<sub>2</sub>O<sub>3</sub>-Doped Aluminum Nitride with High Density Graphite by Spark Plasma Sintering

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