Metal/ceramic or ceramic/ceramic bonded structure

A bonded structure of a metal and a ceramic in which a layer of the ceramic is coated on the surface of the metal as a substrate through an interlayer, wherein said interlayer is formed by plasma-spraying

• (a) a composition composed of 0.2 to 4 mole % of yttria and a balanced mole % of the main component of the substrate metal, in which a powder of aid substrate metal and a powder of yttria are intimately mixed and then given a mechanical impact whereby the two powders are bonded to each other to form a nearly spherical composite powder, or
• (b) a composition composed of 0.2 to 4 mole % of yttria, up to 2 mole % of the main component of the ceramic and a balanced mole % of the main component of the substrate metal, in which a powder of said metal, a powder of yttria and a powder of said ceramic are intimately mixed and given a mechanical impact whereby these powders are bonded to one another to form a nearly spherical composite powder,
• on the surface of the substrate metal, or by coating each said composition on the surface of the substrate metal and then heat-treating the resulting structure at a high temperature in vacuum or in an inert gas.

A bonded structure of a ceramic and a metal in which a layer of the metal is coated on the surface of the ceramic as a substrate through an interlayer, wherein said interlayer is formed by plasma-spraying

• (a) a composition composed of 0.2 to 4 mole % of yttria and a balanced mole % of the main component of the metal to be coated, in which the metal powder and the yttria powder are intimately mixed and then given a mechanical impact whereby the two powders are bonded to each other to form a nearly spherical composite powder, or
• (b) a composition composed of 0.2 to 4 mole % of yttria, up to 2 mole % of the main component of the ceramic and a balanced mole % of the main component of the metal to be coated, in which the metal powder, the yttria powder and the ceramic powder are intimately mixed and then given a mechanical impact whereby these powders are bonded to one another to form a nearly spherical composite powder,
• on the surface of the substrate ceramic, or by coating each said composition on the surface of the substrate ceramic and then heat-treating the resulting structure at a high temperature in vacuum or in an inert gas.