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Graded coatings by gradient temperature densification

Published online by Cambridge University Press:  31 January 2011

Sung Kang Hur ,
Sang H. Yoo ,
Joanna R. Groza ,
Jung Man Doh ,
Kazuo Yamazaki  and
Kazuo Shoda
Sung Kang Hur
Affiliation:
Department Materials Science and Technology, Chang-won University, Korea
Sang H. Yoo
Affiliation:
Department of Chemical Engineering/Materials Science and Mechanical Engineering, University of California at Davis, Davis, California 95616–5294
Joanna R. Groza
Affiliation:
Department of Chemical Engineering/Materials Science and Mechanical Engineering, University of California at Davis, Davis, California 95616–5294
Jung Man Doh
Affiliation:
Division of Metals, Korea Institute of Science and Technology, Seoul, Korea
Kazuo Yamazaki
Affiliation:
Department of Chemical Engineering/Materials Science and Mechanical Engineering, University of California at Davis, Davis, California 95616–5294
Kazuo Shoda
Affiliation:
Sodick Co., Ltd., 3-12-1 Nakamuchidai, Midoriky, Yokohama, Japan
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Abstract

Functionally gradient materials (FGM) were prepared using layers of ZrO2 –3 mol% Y2O3 ceramic and NiCrAlY powders. A fine-grained zirconia powder was chosen to lower the ceramic sintering temperature and achieve simultaneous metal and ceramic densification. Consolidation of FGM's was achieved by a short time field-assisted sintering technique. Sintering was performed either at a constant temperature or in a temperature gradient by using punches made of different materials (i.e., one graphite and one tungsten). A temperature gradient of at least 100 °C was required with a low value of 1200 °C at the metal end and exceeding 1300 °C at the ceramic end. Increasing the number of intermediate layers alleviates some of the cracks formed during sintering due to different coefficients of thermal expansion.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 5 , May 1998 , pp. 1255 - 1259
Copyright
Copyright © Materials Research Society 1998

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References

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