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1. (WO1992012804) THERMAL SPRAY METHOD UTILIZING IN-TRANSIT POWDER PARTICLE TEMPERATURES BELOW THEIR MELTING POINT
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1992/012804 International Application No.: PCT/US1992/000068
Publication Date: 06.08.1992 International Filing Date: 15.01.1992
Chapter 2 Demand Filed: 03.08.1992
IPC:
B05B 7/20 (2006.01) ,C23C 4/12 (2006.01) ,F23M 5/08 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
05
SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
B
SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
7
Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
16
incorporating means for heating the material to be sprayed
20
by flame or combustion
C CHEMISTRY; METALLURGY
23
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
C
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
4
Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
12
characterised by the method of spraying
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23
COMBUSTION APPARATUS; COMBUSTION PROCESSES
M
CONSTRUCTIONAL DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
5
Casings; Linings; Walls
08
Cooling thereof; Tube walls
Applicants:
BROWNING, James, A. [US/US]; US
Inventors:
BROWNING, James, A.; US
Agent:
ZINN, Donald, E.; Sughrue, Mion, Zinn Mac Peak & Seas 2100 Pennsylvania Avenue, N.W. Washington, DC 20037, US
Priority Data:
641,95816.01.1991US
740,78806.08.1991US
Title (EN) THERMAL SPRAY METHOD UTILIZING IN-TRANSIT POWDER PARTICLE TEMPERATURES BELOW THEIR MELTING POINT
(FR) PROCEDE DE PULVERISATION THERMIQUE UTILISANT DES TEMPERATURES DE PARTICULES DE POUDRE DE TRANSIT ENTRANT INFERIEURES A LEUR POINT DE FUSION
Abstract:
(EN) A method of operation of a plasma torch, an internal burner or the like to produce a hot gas jet stream directed toward a workpiece (s) to be coated by operating the plasma torch or internal burner at high pressure while feeding a powdered material (P1) to the stream to be heated by the stream and projected at high velocity onto a workpiece surface (S). The improvement resides in limiting the heating of the powdered material (P1) by the jet stream to that only sufficient to raise the temperature of the particles of the powdered material (P1) to a temperature lower than the melting point of the material, maintaining the intransit temperature of the particles to the workpiece below that melting point, while providing a sufficient velocity to the particles striking the workpiece to achieve an impact energy transformation into heat to raise the temperature of the particles to fusion temperature capable of fusing the material onto the workpiece surface as a dense coating (C).
(FR) Procédé d'actionnement d'un chalumeau à plasma, d'un brûleur interne ou analogue afin de produire un courant jet de gaz chaud orienté vers une ou plusieurs pièce(s) à usiner auxquelles on veut appliquer un revêtement à l'aide du chalumeau à plasma ou d'un brûleur interne à haute pression par alimentation en matière pulvérulente (P1) du courant, ladite matière étant chauffée par le courant puis projetée à vitesse élevée sur une surface (S) de la pièce à usiner. L'amélioration consiste à limiter le chauffage de la matière pulvérulente (P1) par le courant jet de manière à élever la température des particules de la matière pulvérulente (P1) jusqu'à une température inférieure à la température du point de fusion de la matière, à maintenir la température de transit entrant des particules dirigées vers la pièce à usiner au-dessous de la température du point de fusion, tout en donnant aux particules venant heurter la pièce à usiner une vitesse suffisante pour transformer l'énergie d'impact en chaleur afin d'élever la température des particules jusqu'à la température de fusion permettant une fusion de la matière sur la surface de la pièce à usiner pour former un revêtement dense (C).
Designated States: AU, BR, CA, JP
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, MC, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0567569JPH06504227AU1992012338