Effects of Y2O3 and Al2O3 sintering additives on the hot pressing behavior of AlN ceramics

Sungkyu Lee; Hang Chul Jung; Sung-Su Cho; Hyun Seon Hong

doi:10.3139/120.110731

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Effects of Y₂O₃ and Al₂O₃ sintering additives on the hot pressing behavior of AlN ceramics

Sungkyu Lee , Hang Chul Jung , Sung-Su Cho and Hyun Seon Hong

Published/Copyright: April 21, 2015

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From the journal Materials Testing Volume 57 Issue 5

Abstract

AlN plates were fabricated by hot pressing AlN-Y₂O₃ and AlN-Y₂O₃-Al₂O₃ powder mixtures at 1700–1900 °C using yttria and alumina (Al₂O₃ particle sizes of 3 and 10 μm) powders as sintering additives. The physical and mechanical properties of the hot-pressed AlN ceramics were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The density, thermal conductivity, transverse rupture strength, and grain size were measured. The thermal conductivity of the hot–pressed AlN ceramics ranged between 83–92.7 W × (m × K)⁻¹ and decreased with the addition of Al₂O₃, whereas the mechanical properties improved with the addition of Al₂O₃, which is known to have a beneficial effect of grain size refinement. The measured density values of 3.31 to 3.34 g × cm⁻³ were slightly higher than the theoretical density of 3.26 g × cm⁻³. This result was attributed to the use of a carbon mold under N₂ atmosphere, which effectively removed oxygen atoms from the yttrium-aluminate phase that is expected to form at 1100 °C.

Kurzfassung

Für den vorliegenden Beitrag wurden AlN-Platten durch Heißpressen von AlN-Y₂O₃- und AlN-Y₂O₃-Al₂O₃-Pulvergemischen zwischen 1700–1900 °C hergestellt, wobei Yttrium- und Aluminiumoxide (Al₂O₃ mit einer Partikelgröße von 3 und 10 μm) als Zusätze verwendet wurden. Die physikalischen und mechanischen Eigenschaften der warmgepressten AlN-Keramiken wurden mittels Röntgendiffraktometrie (XRD), Rasterelektronenmikroskopie (REM) und energiedispersiver Röntgenspektroskopie (EDS) charakterisiert. Die Dichte, die thermische Leitfähigkeit, die Querzugfestigkeit und die Korngröße wurden gemessen. Die thermische Leitfähigkeit der heißgepressten AlN-Keramiken betrug zwischen 83 und 92.7 W × (m × K)⁻¹ und nahm mit dem Zusatz von Al₂O₃ ab, wobei die mechanischen Eigenschaften sich mit der Zugabe von Al₂O₃ verbesserten, was sich bekanntermaßen auf den vorteilhaften Effekt auf die Kornfeinung zurückführen lässt. Die gemessenen Werte der Dichte zwischen 3.31 und 3.34 g × cm⁻³ waren leicht höher als die theoretische Dichte von 3.26 g × cm⁻³. Dieses Ergebnis ließ sich auf die Verwendung einer Carbonform unter N₂-Atmosphäre zurückführen, wodurch die Sauerstoffatome effektiv aus der Yttrium-Aluminat-Phase entfernt werden konnten, von der erwartet wird, dass sie sich bei 1100 °C bildet.

§Correspondence Address, Dr. Sungkyu Lee, Principal Engineer, Plant Engineering Center, Institute for Advanced Engineering (IAE), 633-2 Goan-ri, Baegam-myeon, Cheoin-gu, Yongin-si, Gyeonggi-do, 449-863, Korea, E-mail: sklee@ajou.ac.kr

Sungkyu Lee, born 1959, received his BS from the Hanyang University of Seoul, Korea, in 1982. He graduated with a MS and PhD in Materials Science and Engineering from the University of Minnesota in Twin Cities, USA, in 1991 and 1994, respectively. He is currently working as Principal Engineer at the Plant Engineering Center, Institute for Advanced Engineering, Yongin-si, Gyeonggi-do, Korea.

Hang-Chul Jung, born 1977, received his BS and MS in Metallurgical Materials Engineering from the Chosun University, Gwangju, Korea, in 2002 and 2004, respectively. He completed the PhD course in Materials Science and Engineering at Ajou University, Suwon, Korea in 2012, fulfilling all academic requirements to finish his PhD thesis. He is currently working as Senior Researcher at the Advanced Materials and Processing Center, Institute for Advanced Engineering, Yongin-si, Gyeonggi-do, Korea.

Sung-Su Cho, born 1973, received his B. S. at Kyonggi University, Suwon, Korea, in 2005. He graduated as M. S. in Energy Systems Research at the Ajou University, Suwon, Korea, in 2007. Now he is working as a Principal Engineer and team leader at the Advanced Materials & Processing Center, Institute for Advanced Engineering, Yongin-si, Gyeonggi-do, Korea. Besides, he is currently under Ph.D. program at the Energy System Division, Ajou University, Suwon-si, Korea.

Hyun Seon Hong, born 1968, received his BS, MS and PhD in Materials Engineering from the Hanyang University, Seoul, Korea, in 1991, 1994 and 1998, respectively. He is currently Professor at the Sungshin Women's University, Department of Interdisciplinary ECO Science, Seoul, 142-732, Korea.

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Published Online: 2015-04-21

Published in Print: 2015-04-30

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https://doi.org/10.3139/120.110731