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Graded coatings by gradient temperature densification

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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.

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Authors and Affiliations

  1. Department Materials Science and Technology, Chang-won University, Korea

    Sung Kang Hur

  2. Department of Chemical Engineering/Materials Science and Mechanical Engineering, University of California at Davis, Davis, California, 95616-5294, USA

    Sang H. Yoo, Joanna R. Groza & Kazuo Yamazaki

  3. Division of Metals, Korea Institute of Science and Technology, Seoul, Korea

    Jung Man Doh

  4. Sodick Co., Ltd., 3-12-1 Nakamuchidai, Midoriky, Yokohama, Japan

    Kazuo Shoda

Authors
  1. Sung Kang Hur
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  2. Sang H. Yoo
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  3. Joanna R. Groza
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  4. Jung Man Doh
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  5. Kazuo Yamazaki
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  6. Kazuo Shoda
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Hur, S.K., Yoo, S.H., Groza, J.R. et al. Graded coatings by gradient temperature densification. Journal of Materials Research 13, 1255–1259 (1998). https://doi.org/10.1557/JMR.1998.0179

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  • DOI: https://doi.org/10.1557/JMR.1998.0179

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