نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی مالک اشتر

2 malek ashtar univ. tech

3 malek ashtar univ. tech.

چکیده

In this study, we investigated the optical and high-temperature thermochromic characteristics of yttrium iron garnet powder and paint. The powders were produced using the solid-state reaction technique, and the thermochromic paint was sprayed over an Al alloy substrate. X-ray diffraction patterns, optical and field emission scanning electron microscopes, and UV-Vis and FTIR spectrophotometers were used to assess the structural, surface morphology and optical characteristics of the materials. The thermochromic characteristics of the materials were investigated by extracting the chromatic coordinates L*b*a* from digital pictures taken at temperatures ranging from 25 to 210 °C. The results reveal that when the temperature rises, the color of the paint changes from dark green to dark brown. The charge transfer between oxygen and iron ions, as well as the electron transition across the orbitals of the d layer, could be responsible for the reversible color change. The paint has strong thermal stability up to 350 °C which is suitable for high-temperature thermochromic applications.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Optical and thermochromic properties of yttrium iron garnet paint

نویسندگان [English]

  • Ali Rostamnejadi 1
  • Mohammad Madahi Harandi 2
  • Mohammad Jazirehpour 3

1 Malek Ashtar univ. Tech.

2 malek ashtar univ. tech

3 malek ashtar univ. tech.

چکیده [English]

In this study, we investigated the optical and high-temperature thermochromic characteristics of yttrium iron garnet powder and paint. The powders were produced using the solid-state reaction technique, and the thermochromic paint was sprayed over an Al alloy substrate. X-ray diffraction patterns, optical and field emission scanning electron microscopes, and UV-Vis and FTIR spectrophotometers were used to assess the structural, surface morphology and optical characteristics of the materials. The thermochromic characteristics of the materials were investigated by extracting the chromatic coordinates L*b*a* from digital pictures taken at temperatures ranging from 25 to 210 °C. The results reveal that when the temperature rises, the color of the paint changes from dark green to dark brown. The charge transfer between oxygen and iron ions, as well as the electron transition across the orbitals of the d layer, could be responsible for the reversible color change. The paint has strong thermal stability up to 350 °C which is suitable for high-temperature thermochromic applications.

کلیدواژه‌ها [English]

  • Thermochromic
  • High Temperature paint
  • Yttrium iron garnet
  • powder

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