Coating material
AssigneeROLLS-ROYCE plc
InventorsWilliam B. Litchfield, John T. Gent, James A. S. Graham
Life of this patent
Estimating the term…
Abstract
A powder suitable for flame spraying comprising particles of an alumino silicate glass, each of the particles being hollow and coated with an alloy containing, by weight, 80% nickel, 2.5% aluminium, 15.7% chromium and 1.8% silicon. The resultant coating is particularly suitable for use as a thermal barrier.
Claims17
A powder suitable for flame spraying comprising:
- particles of a glass, each of said particles being hollow and coated with a metal, said metal being selected from the group consisting of a cobalt based alloy and a nickel based alloy, said alloy containing aluminum, chromium and silicon.
A powder suitable for flame spraying comprising particles of a glass, each of said particles being hollow and coated with an alloy comprising, by weight, 80% nickel, 2.5% aluminium, 15.7% chromium, and 1.8% silicon, said glass comprising by weight 31.9% Al.sub.2 O.sub.3, 60.75% SiO.sub.2, 4.18% Fe.sub.2 O.sub.3, 1.91% K.sub.2 O and 0.81% Na.sub.2 O and constituting 10% by weight of each of said particles.
A method of providing a surface of a gas turbine engine with a thermal barrier coating which is sufficiently ductile to resist flaking off of the surface as a result of differing rates of thermal expansion of the surface and the coating comprising:
- forming a powder consisting of glass particles, each of said glass particles being hollow and being provided with a continuous metal coating;
- and
- flame spraying the powder on to the surface of the gas turbine engine to a depth within a range of 0.2 to 0.7 mm., the metal coating of the hollow glass particles bonding adjacent particles to each other and to the surface of the gas turbine engine to form the thermal barrier coating thereon.
Dependencies are inferred from the claim text.