Effects of Y2O3 on mechanical, dielectric, and microwave‐absorbing properties of short carbon‐fiber/Al2O3 composites. Issue 3 (29th November 2013)

• Record Type: Journal Article
• Authors: Huang, Shanshan; Zhou, Wancheng; Wei, Ping; Luo, Fa; Zhu, Dongmei
• Is Part Of: Physica status solidi. Volume 211:Issue 3(2014:Mar.)
• Page Start: 630
• Page End: 635
• Publication Date: 2013-11-29
• Subjects: Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.201330238
• Languages: English
• ISSNs: 1862-6300

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="pssa201330238-sec-0001" sec-type="section"> <p>Short carbon‐fiber (C_sf) reinforced alumina ceramics with MgO–Y₂O₃ as additives were fabricated by pressureless sintering at 1500 °C for 2 h. The mechanical, dielectric and microwave properties of the composites in the X band (8.2–12.4 GHz) were evaluated. The flexure strength and HRA of the ceramic increased with increasing Y₂O₃ content and the maximum values of 293 MPa and 98 were obtained by the addition of 1.0 wt% Y₂O₃, which were about 33.2% and 12.6% higher than the composite without Y₂O₃, respectively. Both the real and imaginary parts of the complex permittivity increased with increasing Y₂O₃ content. The composite containing 0.5 wt% Y₂O₃ showed that reflection loss exceeded −10 dB in the frequency of 9.6–11.6 GHz and the minimum value was −33 dB at 10.38 GHz. The results showed that the addition of Y₂O₃ allowed both mechanical and microwave absorbing properties of the composite to be enhanced and it indicates that the C_sf/Al₂O₃ ceramic prepared by pressureless sintering with a small quantity of Y₂O₃ is a promising microwave absorber with satisfactory mechanical properties.</p> </sec> </abstract>