The Synthesis of Graded Thermal Barrier Coatings on Nickel Substrates by Laser Induced Thermite Reactions

抄録

Al₂O₃ and ZrO₂-Al₂O₃ bearing coatings were synthesized onto nickel substrates by laser induced thermite reactions. The oxide coatings were produced via thermite reactions between NiO and Al powders with and without the addition of Y₂O₃-stabilised ZrO₂ (YSZ), respectively. In the case where no YSZ was added, a graded coating with a top layer of Al₂O₃ was produced. Whereas, when YSZ was added, the coating essentially comprised ZrO₂ dendrites with the interdendritic regions filled with the ZrO₂-Al₂O₃ eutectic phase. The formation process of the coatings is described.