Effect of annealing process on IR transmission and mechanical properties of spark plasma sintered Yttria

In this study, fully dense Yttria ceramics were successfully fabricated by spark plasma sintering (SPS) at temperatures of 1300 and 1350 ℃. The effects of post-annealing on IR transmission were investigated by Fourier transform infrared spectroscopy (FTIR) at various temperatures ranging from 1050 t...

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Bibliographic Details
Published in:Ceramics international 2018-02, Vol.44 (2), p.1668-1674
Main Authors: Irom, Elnaz, Zakeri, Mohammad, Hossein Zadeh, Ali Sedaghat Ahangari
Format: Article
Language:English
Subjects:
Annealing
Ceramics
IR transmission
Mechanical properties
Sintering
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Summary:In this study, fully dense Yttria ceramics were successfully fabricated by spark plasma sintering (SPS) at temperatures of 1300 and 1350 ℃. The effects of post-annealing on IR transmission were investigated by Fourier transform infrared spectroscopy (FTIR) at various temperatures ranging from 1050 to 1250 ℃. It was found that the optimum annealing temperature depends strongly on the sintering temperature. Annealed samples showed white opaqueness mainly due to the increase and coalescence of pores after annealing and showed an absorption band around 6.6 μm which limits usage of yttria in IR applications. Sintering at 1350 ℃ and annealing at 1250℃ led to the maximum IR transmittance above 80% at wavelength of 5μm for a 3.5-mm-thick sample. The hardness and the fracture toughness of the samples were analyzed in detail and hardness of 9.2GPa and fracture toughness of 1.65MPam1/2 were obtained for the above sample.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2017.10.092