Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Patent
1994-04-18
1995-01-24
Walsh, Donald P.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having metal particles
4285395, 428545, B22F 700
Patent
active
053842006
ABSTRACT:
A thermal barrier coating and method of depositing the same on the surfaces of combustion chamber components in compression-ignition internal combustion engines is disclosed. The thermal barrier coating is a dual layer having a first metallic layer comprised of MCrAlY material deposited on the component surface. A porous ceramic layer comprised of Yttria partially stabilized zirconia or Ceria-Yttria partially stabilized zirconia is deposited on the metallic layer to impede the flow of heat therethrough. In operation, the metallic layer creates a mechanical bond between the component surface and the ceramic layer, allows for a smooth transition between the differing physical properties of the component and the ceramic layer and serves as a corrosion barrier by protecting the component from combustion gases and contaminants. There is further disclosed a method of depositing the thermal barrier coating comprising the steps of (1) chemically treating the component surface to remove dirt and oil; (2) grit blasting the treated component surface to roughen the surface and increase the available surface area for deposition; (3) plasma spray depositing a metallic layer comprised of MCrAlY material on the roughened component surface to a thickness between 0.003-0.006 inches; and (4) depositing a porous ceramic material comprised of 10%-15% volume porosity Yttria partially stabilized zirconia or 10%-15% volume porosity Ceria-Yttria partially stabilized zirconia on the metallic layer to impede the flow of heat therethrough.
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Begin Roger E.
Dugger David R.
Giles David C.
Paskvan Eric W.
Carroll Chrisman D.
Detroit Diesel Corporation
Walsh Donald P.
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