Effects of Y2O3 and Al2O3 sintering additives on the hot pressing behavior of AlN ceramics
| العنوان: | Effects of Y2O3 and Al2O3 sintering additives on the hot pressing behavior of AlN ceramics |
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| المؤلفون: | Hyun Seon Hong, Hang Chul Jung, Sung-Su Cho, Sungkyu Lee |
| المصدر: | Materials Testing. 57:417-423 |
| بيانات النشر: | Walter de Gruyter GmbH, 2015. |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Materials science, Scanning electron microscope, Mechanical Engineering, Metallurgy, Sintering, Hot pressing, Grain size, Thermal conductivity, Mechanics of Materials, visual_art, visual_art.visual_art_medium, Particle, General Materials Science, Ceramic, Composite material, Yttria-stabilized zirconia |
| الوصف: | 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. |
| تدمد: | 2195-8572 0025-5300 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::4b1877e4ab4250f538b0b3d92675278f https://doi.org/10.3139/120.110731 |
| رقم الأكسشن: | edsair.doi...........4b1877e4ab4250f538b0b3d92675278f |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 21958572 00255300 |
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