Process for treating high temperature corrosion resistant composite surface
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsMasaharu Nakamori, Kouji Takahashi
Life of this patent
Estimating the term…
Abstract
A process for treating a high temperature corrosion resistant composite surface is disclosed. The process includes the steps of forming a first alloy layer by coating a metallic base material with a NiCr alloy or a MCrAlY alloy (M being made of one or more selected from the group consisting of Fe, Ni and Co) with low pressure plasma spraying, forming a second alloy layer on the first alloy layer by coating the first layer with an alloy having identical composition with atmospheric plasma spraying and then subjecting these layers to thermal diffusion treatment in a vacuum furnace or an inert gas atmosphere furnace. Thus, high temperature corrosion resistance is provided for a metallic material used at high temperatures.
Claims8
A surface treatment process for producing a high temperature corrosion resistant composite surface, comprising the steps of:
- forming a first alloy layer by coating a metallic base material to be used at high temperatures with at least one of a NiCr alloy and a MCrAlY alloy, wherein M is at least one metal selected from the group consisting of Fe, Ni and Co using low pressure plasma spraying;
- forming a second alloy layer on said first alloy layer by coating said first alloy layer with an alloy having identical composition, using atmospheric pressure plasma spraying;
- and
- subjecting said first and second layers to thermal diffusion treatment in at least one of a vacuum furnace and an inert gas atmosphere furnace.
A high temperature corrosion resistant composite material, produced by forming a first alloy layer on a surface of a metallic base material to be used at high temperatures, by low pressure plasma spraying, forming a second alloy layer on said first alloy layer by coating said first alloy layer with an alloy having identical composition by atmospheric pressure plasma spraying, and then subjecting said first and second alloy layers to thermal diffusion treatment in at least one of a vacuum furnace and an inert gas atmosphere furnace, wherein said first alloy layer comprises at least one of a NiCr alloy and a MCrAlY alloy, wherein M is at least one metal selected from the group consisting of Fe, Ni and Co.
Dependencies are inferred from the claim text.