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Enhanced mechanical properties of machinable mica glass ceramics at cryogenic temperatures

Published online by Cambridge University Press:  01 December 2016

Juan Chen  and
Zhipeng Xie
Juan Chen
Affiliation:
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
Zhipeng Xie*
Affiliation:
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
*
Address all correspondence to Zhipeng Xie at [email protected]
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Abstract

Machinable mica glass ceramics were synthesized by sintering method. The crystal phase was characterized using x-ray diffraction, showing that the main crystal phase was fluorophlogopite. Mechanical properties were measured at different temperatures. The results demonstrated that bending strength and fracture toughness increased 28% and 24% when temperature decreased from 300 to 77 K, respectively. Compressive strength also increased at cryogenic temperatures, but a higher value was obtained at 195 K. According to scanning electron microscope observation, the extraction of mica platelets was observed at 77 K, which may be the toughening mechanism of machinable mica glass ceramics.

Type
Research Letters
Information
MRS Communications , Volume 6 , Issue 4 , December 2016 , pp. 464 - 468
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Copyright
Copyright © Materials Research Society 2016 

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