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Effect of graphite coating on measurement of thermal diffusivity of high-thermal-conductivity silicon nitride thin substrates by flash method.

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Title: Effect of graphite coating on measurement of thermal diffusivity of high-thermal-conductivity silicon nitride thin substrates by flash method.
Authors: Zhou, You1 (AUTHOR) you.zhou@aist.go.jp, Hirao, Kiyoshi1 (AUTHOR), Fukushima, Manabu1 (AUTHOR), Abe, Haruka2 (AUTHOR), Akoshima, Megumi2 (AUTHOR), Yagi, Takashi1,2 (AUTHOR) t-yagi@aist.go.jp
Source: Ceramics International. Jun2026:Part B, Vol. 52 Issue 15, p29840-29850. 11p.
Subjects: Thermal diffusivity, Silicon nitride, Substrates (Materials science), Thermal conductivity, Heat transfer, Carbon films, Laminated materials
Abstract: The influence of graphite coating on the measurement of thermal diffusivity by the flash method was systematically investigated using thin, high-thermal-conductivity silicon nitride (Si 3 N 4) substrates (≈90 W/(m·K) and 120 W/(m·K)) with thicknesses of 2.0 mm, 0.32 mm, and 0.25 mm. While coating had negligible influence for 2.0 mm samples, the measured diffusivity decreased with increasing coating weight for 0.32 mm and 0.25 mm samples, with stronger effects for thinner and more thermally conductive substrates. The results highlight the need to strictly control graphite-coating amount for thin, high-conductivity materials, and the observed trend was quantitatively explained using a laminated structure model accounting for through-thickness heat transfer. [ABSTRACT FROM AUTHOR]
Copyright of Ceramics International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 194171560
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Effect of graphite coating on measurement of thermal diffusivity of high-thermal-conductivity silicon nitride thin substrates by flash method.
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  Data: <searchLink fieldCode="AR" term="%22Zhou%2C+You%22">Zhou, You</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> you.zhou@aist.go.jp</i><br /><searchLink fieldCode="AR" term="%22Hirao%2C+Kiyoshi%22">Hirao, Kiyoshi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fukushima%2C+Manabu%22">Fukushima, Manabu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abe%2C+Haruka%22">Abe, Haruka</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Akoshima%2C+Megumi%22">Akoshima, Megumi</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yagi%2C+Takashi%22">Yagi, Takashi</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> t-yagi@aist.go.jp</i>
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  Data: <searchLink fieldCode="JN" term="%22Ceramics+International%22">Ceramics International</searchLink>. Jun2026:Part B, Vol. 52 Issue 15, p29840-29850. 11p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Thermal+diffusivity%22">Thermal diffusivity</searchLink><br /><searchLink fieldCode="DE" term="%22Silicon+nitride%22">Silicon nitride</searchLink><br /><searchLink fieldCode="DE" term="%22Substrates+%28Materials+science%29%22">Substrates (Materials science)</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+conductivity%22">Thermal conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+transfer%22">Heat transfer</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+films%22">Carbon films</searchLink><br /><searchLink fieldCode="DE" term="%22Laminated+materials%22">Laminated materials</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The influence of graphite coating on the measurement of thermal diffusivity by the flash method was systematically investigated using thin, high-thermal-conductivity silicon nitride (Si 3 N 4) substrates (≈90 W/(m·K) and 120 W/(m·K)) with thicknesses of 2.0 mm, 0.32 mm, and 0.25 mm. While coating had negligible influence for 2.0 mm samples, the measured diffusivity decreased with increasing coating weight for 0.32 mm and 0.25 mm samples, with stronger effects for thinner and more thermally conductive substrates. The results highlight the need to strictly control graphite-coating amount for thin, high-conductivity materials, and the observed trend was quantitatively explained using a laminated structure model accounting for through-thickness heat transfer. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ceramics International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.ceramint.2026.05.066
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      – Code: eng
        Text: English
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        PageCount: 11
        StartPage: 29840
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      – SubjectFull: Thermal diffusivity
        Type: general
      – SubjectFull: Silicon nitride
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      – SubjectFull: Substrates (Materials science)
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      – SubjectFull: Laminated materials
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      – TitleFull: Effect of graphite coating on measurement of thermal diffusivity of high-thermal-conductivity silicon nitride thin substrates by flash method.
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              Text: Jun2026:Part B
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              Y: 2026
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