Dense AlN/FeSiAl composite ceramics with high thermal conductivity and strong microwave absorption
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作者
Wang, Longfei; An, Liqiong; Zhou, Guohong; Wang, Xingang; Sun, Kai; Chen, Hetuo; Hou, Hongtao
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刊物名称
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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年、卷、文献号
2022, 33, 0957-4522
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关键词
Wang, Longfei; An, Liqiong; Zhou, Guohong; Wang, Xingang; Sun, Kai; Chen, Hetuo; Hou, Hongtao
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摘要
A series of AlN/x wt% FeSiAl composite ceramics with 4 wt% Y2O3 sintering aid was fabricated by pressureless sintering in a nitrogen atmosphere. Effects of FeSiAl content (0-20 wt%) on the phase, microstructure, mechanical, thermal, electromagnetic, and corresponding microwave absorption properties of the composite ceramics were studied. AlN/FeSiAl composite ceramics comprised of AlN, AlYO3, and Al2Y4O9 phases, and were fully dense with uniform microstructure. The micro-hardness, flexural strength, and thermal conductivity of the composites decreased with an increase in FeSiAl content. AlN with 5 wt% FeSiAl composite ceramic exhibited the minimum reflection loss of - 57.31 dB at 14.32 GHz, an effective absorption bandwidth (< - 10 dB) of 1.48 GHz in 13.63-15.11 GHz, a high thermal conductivity of 130.18 W (m K)(-1), a micro-hardness of 1002.28 HV, and a flexural strength of 356.80 MPa, which is promising for microwave absorbing material.