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Influence of temperature on the spark plasma sintering of calcium fluoride ceramics

Published online by Cambridge University Press:  28 August 2014

Shi Chen  and
Yiquan Wu
Shi Chen
Affiliation:
Kazuo Inamori School of Engineering, New York State College of Ceramics, Alfred University, Alfred, New York 14802, USA
Yiquan Wu*
Affiliation:
Kazuo Inamori School of Engineering, New York State College of Ceramics, Alfred University, Alfred, New York 14802, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The commercially abundant low purity calcium fluoride powder was directly loaded for spark plasma sintering (SPS). In a vacuum atmosphere with a constant pressure held at 70 MPa the sintering temperature was systematically varied in the range of 500–850 °C. X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) techniques were used to characterize the raw powder; and for studying the microstructural properties and in-line transmittance of the finalized ceramics, SEM and Fourier transform infrared spectroscopy (FTIR) were used. Digital images of the 700 °C sintered translucent CaF2 ceramic were taken along with transmittance recordings. The grain growth mechanisms and activation energy values were determined; and the influences of temperature on the relative density, grain size, and optical transmittance were demonstrated. Furthermore, for the first time, a plausible predominant mechanism was proposed for describing the different sintering stages of calcium fluoride ceramics.

Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 19: Focus Issue: Optical Ceramics Science , 14 October 2014 , pp. 2297 - 2302
Copyright
Copyright © Materials Research Society 2014 

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References

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