Rolls-royce Corporation

Rolls-royce (1971) Limited

Terence Walter Maber

Maurice Fisher

Mark Henry Shipton

Colin Garry Lilly

Michael Kruger

A phosphate bonded ceramic is used to provide a diffusion barrier on a titanium alloy substrate, conferring degradation (eg oxidation) resistance to the alloy. The substrate may, for example, be an aerospace component such as a part of a gas turbine engine.

Method of forming a diffusion barrier on a titanium alloy substrate

A method of removing a coating containing aluminium and chromium in combination with cobalt from a nickel base alloy substrate. The coated substrate is immersed in a solution containing the following constituents (by weight):

Method of removing Al-Cr-Co coatings from nickel alloy substrates

A solution for removing a diffused aluminium coating from a component made of nickel or cobalt base high temperature alloy, consisting of Nitric Acid 57%, Sulphuric Acid 29% and Water 14%. The solution removes all but traces of nickel or cobalt-rich aluminides and does not attack the substrate material. If said traces have to be removed also, there is used an etching solution consisting of Ferric Chloride Solution 85%, Sulphuric Acid 10% and Hydrofluoric Acid 5%.

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Bristol, United Kingdom

Terence Walter Maber