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Effect of BN Addition on the Mechanical Properties of AlN

Authors
Cho, Woo-JinOh, Se-HoonShon, In-Jin
Issue Date
May-2019
Publisher
KOREAN INST METALS MATERIALS
Keywords
nanomaterials; sintering; composite; mechanical properties
Citation
KOREAN JOURNAL OF METALS AND MATERIALS, v.57, no.5, pp 310 - 315
Pages
6
Journal Title
KOREAN JOURNAL OF METALS AND MATERIALS
Volume
57
Number
5
Start Page
310
End Page
315
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/25878
DOI
10.3365/KJMM.2019.57.5.310
ISSN
1738-8228
Abstract
Aluminum nitride (AlN) has several attractive properties including high thermal conductivity, excellent electrical insulation, a thermal expansion coefficient close to that of Si and low density. Accordingly, it is considered a promising packing material and substrate for high power integrated circuits. However, its low fracture toughness at room temperature limits its wide industrial application. To improve its mechanical properties, the approach generally utilized has been to fabricate and add nanostructured materials as a second phase, to make composites. In this study highly dense nanostructured AlN and AlN-BN composites were sintered for two minutes at 1400 degrees C. The effect of BN on the mechanical properties (fracture toughness and hardness) and the microstructure of the AlN-BN composites was investigated. The hardness and fracture toughness of AlN, AlN-1 vol% BN, AlN-3 vol% BN, AlN-10 vol% BN were 943, 1455, 1147, 1110 kg/mm(2) and 4, 5.7, 5.5, 5.4 MPa .m(1/2), respectively. The addition of BN to AlN simultaneously improved the hardness and fracture toughness of the AlN-BN composite by deterring crack propagation. This study demonstrates that BN can be an effective reinforcing material to improve the fracture toughness and hardness of AlN composites.
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