Back to results
US 4,146,654 AGranted
Process for making linings for friction operated apparatus
AssigneeCentre National De La Recherche Scientifique
InventorJean-Francis Guyonnet
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeCentre National De La Recherche Scientifique
InventorJean-Francis Guyonnet
Estimating the term…
A friction lining according to the invention is formed of bounded solidified previously molten particles formed on its support by plasma deposition; the base planes 0001 of a major proportion of the crytals in said lining are oriented in directions substantially parallel to the friction surfaces; the materials of which said linings are formed contain metals, metallic oxides or carbides having high melting points; they include cobalt, magnesium, neodymium, titanium, tungsten under its hexagonal form, yttrium, nickel under its hexagonal form, MoC, Mo.sub.2 C, NbC, Nb.sub.2 C, Ta.sub.2 C, WC, W.sub.2 C, V.sub.2 C, Cr.sub.2 O.sub.3, TiO.sub.2 ; they may contain under an alloyed form proportions of non hexagonal materials, including molybdenum, chromium, aluminum, copper, iron, the non hexagonal nickel, niobium, B.sub.4 C, TaC, TiC, Cr.sub.3 C.sub.2, VC, ZrC, ZrO.sub.2, Al.sub.2 O.sub.3, which do not affect the hexagonal structure of the alloys obtained.
A process for forming a lining made of a material having a high melting point on a support which comprises injecting in the plasma jet produced by a plasma torch oriented towards the surface of said support particles of those of the materials which in their molten form are capable of forming the above lining, injecting said particles in a zone of the plasma jet and controlling the ejection velocity thereof such that the injected particles become molten during the time they are maintained within the plasma jet and forming a gaseous barrier in a direction transverse to the plasma flow and to the path of the particles carried by the same, between the outlet of the plasma generator and the support, under a flow and a velocity which breaks the stream of the plasma jet hot gases while the molten particles pass through the barrier without deviation.
A method of applying a homogeneous coating of material on a surface of a workpiece comprising creating a jet of heated particles of material, directing the jet of particles along a path at the surface to be coated, removing decomposition products from the jet of particles prior to contacting the surface of the workpiece by directing a flow of gas transversely to the path of the jet to deflect the decomposition products from the path of the jet of particles prior to the particles of the jet striking the surface of the workpiece, and collecting the decomposition products deflected from the path of the jet of particles.
A method of applying a homogeneous coating of material on a surface of a workpiece comprising creating a jet of heated particles of material, directing the jet of particles along a path at the surface to be coated, removing decomposition products from the jet of particles prior to contacting the surface of the workpiece by directing a flow of gas transversely to the path of the jet to deflect the decomposition products from the path of the jet of particles prior to the particles of the jet striking the surface of the workpiece.
A method of applying a homogeneous coating of material on a surface of a workpiece comprising creating a jet of heated particles of material, directing the jet of particles along a path at the surface to be coated, removing unwanted products from the jet of particles prior to contacting the surface of the workpiece by directing a flow of gas transversely to the path of the jet to deflect unwanted products from the path of the jet of particles prior to the particles of the jet striking the surface of the workpiece.
Dependencies are inferred from the claim text.