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<p>The use of aluminum alloys in engines is common due to their lightness and strength. These components need coatings to resist high temperatures and reduce heat transfer. Enamels based on aluminoborophosphate frit are ideal, but their rheological properties and performance as a thermal barrier need to be investigated. This study optimizes the glaze and evaluates it as a thermal barrier. Suspensions with different fractions of solids, dispersants and binders were prepared and studied for rheological behavior. Samples were sintered at 475, 500 and 525&#xa0;°C and evaluated for thermal shrinkage and density. The microstructure was analyzed by SEM and characterized by XRD and hardness. Thermal conductivity was measured using the laser flash method. Suspensions with 48% solids, 1% sodium nitrite and 0.25% kaolin showed optimum stability. The coatings reduced thermal conductivity by up to 70% at 300&#xa0;°C, suggesting effectiveness in industrial applications, especially in aluminum–silicon alloy motors.</p>

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Evaluation of aluminoborophosphate enamel coating for application as a thermal barrier to aluminum alloys

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Francieli Gonçalves Franceschini,
  • Henrique Borba,
  • Fabiano Raupp-Pereira,
  • Oscar Rubem Klegues Montedo,
  • Sabrina Arcaro,
  • Carlos Pérez Bergmann

摘要

The use of aluminum alloys in engines is common due to their lightness and strength. These components need coatings to resist high temperatures and reduce heat transfer. Enamels based on aluminoborophosphate frit are ideal, but their rheological properties and performance as a thermal barrier need to be investigated. This study optimizes the glaze and evaluates it as a thermal barrier. Suspensions with different fractions of solids, dispersants and binders were prepared and studied for rheological behavior. Samples were sintered at 475, 500 and 525 °C and evaluated for thermal shrinkage and density. The microstructure was analyzed by SEM and characterized by XRD and hardness. Thermal conductivity was measured using the laser flash method. Suspensions with 48% solids, 1% sodium nitrite and 0.25% kaolin showed optimum stability. The coatings reduced thermal conductivity by up to 70% at 300 °C, suggesting effectiveness in industrial applications, especially in aluminum–silicon alloy motors.