Osprey Metals Limited

The Secretary of State for Defence in Her Britannic Majesty's Government

The Secretary of the State for Defence in Her Britannic Majesty's

Charles R Pratt

Robert W Gardiner

James E Restall, Deceased

Panayiotis Tsakiropoulos

Howard Jones

Harvey P Cheskis

Sankaranarayanan Ashok

W Gary Watson

Jeffrey S Coombs

Alan George Leatham

James Burnett Forrest

Peter F Chesney

A method and apparatus for the production of a deposit such as a bar (1) is provided. The deposit has a longitudinal outer surface (2) and a front face deposition surface (3). The spray deposition comprises atomized droplets produced by outer and inner sprays (4 and 5). The outer and inner sprays (4 and 5) are both directed such that, during deposition, a substantial proportion of droplets from both sprays are deposited on the front face (3) of the forming deposit. The inner spray (5) has a higher gas to metal ratio than the outer spray allowing an increase of both deposition and final product yield.

Production of spray deposits

A molten metal gas-atomizing spray-depositing apparatus has an atomizer which employs a pressurized gas flow for atomizing a stream of molten metal into a spray pattern of metal particles being initially hotter than the solidus temperature of the metal. The apparatus also has a substrate system which includes an outer substrate of metallic foil and an inner substrate for supporting the outer substrate. The outer foil substrate is movable relative to the metal particles in the spray pattern thereof and disposed below the atomizer for receiving on a surface of the foil a deposit of the particles in the spray pattern to form a product on the outer foil substrate. The outer foil substrate is of a thickness which is less than a predefined maximum thickness at which the capacity of the foil to absorb heat from the deposit is equal to the latent heat and super heat, if present, of the deposit. The foil thickness precludes reduction in temperature below the solidus temperature, and thereby complete solidification, of the metal particles forming the deposit upon initial contact with the foil surface whereby a reduction of porosity is achieved in the deposit.

Substrate for spray cast strip

Spray deposition method and apparatus thereof

Rapid solidification route aluminium alloys containing lithium

Rapid solidification route aluminium alloys containing chromium

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Neath, United Kingdom

Charles R Pratt