Abrasion testing
AssigneeFulmer Research Institute Limited
InventorsDuncan Stewart, Gwilym I. Williams, David A. Cash, Nicholas D. Anstey
Life of this patent
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Abstract
Abrasion testing, and hence particle content of fluids including liquids and gases is carried out by abrading a thin film 25 of an electrical conductor with the fluid, and measuring the resulting change in electrical resistance of the film. The method can be used to monitor metal particles in oil, and hence the state of wear of oil-lubricated metal parts, and the level of particulate pollution in the atmosphere.
Claims16
A method for determining the degree of abrasiveness of a fluid, which comprises directing a jet of the fluid at a thin film of an electrically conducting corrosion resistant material on the surface of an electrically insulating material to thereby abrade the film, and observing the change in electrical resistance of the electrically conducting film.
A method for determining the degree of abrasiveness of a fluid, which comprises passing a substrate coated with the fluid over the surface of a thin film of an electrically conducting material on the surface of an electrically insulating material to thus abrade the film and observing the change in electrical resistance of the electrically conducting film.
A method of monitoring the state of wear of an oil-lubricated metal bearing, which method comprises determining the abrasiveness of the oil by abrading with the oil a thin film of an electrically conducting material on the surface of an electrically insulating material, and observing the change in electrical resistance of the films.
Apparatus for determining the abrasiveness of a fluid, which apparatus comprises a testing head having a thin film of electrically conducting corrosion resistant material deposited on an electrically insulating material, means for making electrical contact with the film to sense its electrical resistance, and a nozzle for directing a jet of the fluid onto the head, to abrade the film.
A method for determining the degree of abrasiveness of a fluid, which comprises abrading with the fluid a thin film of an electrically conducting material which has been vacuum deposited on the surface of an electrically insulating material, and observing the change in electrical resistance of the electrically conducting film.
A method for determining the degree of abrasiveness of a fluid, which comprises abrading with the fluid a thin film of an electrically conducting material having a thickness of 3000 A on the surface of an electrically insulating material, and observing the change in electrical resistance of the electrically conducting film.
Dependencies are inferred from the claim text.