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Highly infrared transparent spark plasma sintered AlON ceramics

Published online by Cambridge University Press:  18 April 2017

Yingchun Shan ,
Xialu Wei ,
Xiannian Sun ,
Jiujun Xu ,
Qinghua Qin  and
Eugene A. Olevsky
Yingchun Shan*
Affiliation:
Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China
Xialu Wei
Affiliation:
College of Engineering, San Diego State University, San Diego, CA 92182, USA
Xiannian Sun
Affiliation:
Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China
Jiujun Xu
Affiliation:
Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China
Qinghua Qin
Affiliation:
Research School of Engineering, Australian National University, Acton, ACT 2601, Australia
Eugene A. Olevsky*
Affiliation:
College of Engineering, San Diego State University, San Diego, CA 92182, USA
*
a) Address all correspondence to these authors. e-mail: [email protected]
b) e-mail: [email protected]
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Abstract

Spark plasma sintering (SPS) is adopted to fabricate transparent AlON ceramics at 1350–1500 °C under 40 MPa, using a bimodal γ-AlON powder synthesized by the carbothermal reduction and nitridation method. After holding 10 min, high density samples are obtained, and their optical transmittance is investigated over the wavelength range of 1330–6000 nm. Despite the samples SPS-processed at 1350 °C indicate the presence of three-phases: γ-AlON, α-Al2O3, and h-AlN, they show high infrared transparency, i.e., the maximum transmittance for 1.2 mm thick specimens is up to 77.3% at ∼3900 nm. Also, the processed samples exhibit high hardness of 17.81 GPa. The high infrared transmittance should be mainly attributed to high density and rationally controlled grain size distribution, and the high hardness is apparently caused by a small grain size.

Keywords

ceramicpowdersintering
Type
Invited Articles
Information
Journal of Materials Research , Volume 32 , Issue 17: Focus Issue: Achieving Superior Ceramics and Coating Properties through Innovative Processing , 14 September 2017 , pp. 3279 - 3285
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Eugene Medvedovski

References

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