Abstract: An autogenous flame spraying apparatus includes a supply line housing having gas supply lines for combustion gas, carrier gas and acceleration gas; a main housing connected to the supply line housing and having a supply line for a spray powder, and ducts communicating with the gas supply lines, the housing having a first injector for mixing the spray powder and the carrier gas to form a first mixture; an interchangeable nozzle carrier for carrying a releasable torch nozzle, the carrier being releasably attached to the main housing and having a second injector for mixing the combustion gas and the carrier gas to form a second mixture, the nozzle carrier also having ducts for conveying the first mixture and the second mixture to the torch nozzle, whereby the carrier can be replaced so as to alter both flame power and feed of spray powder.

Abstract: A flame spray directing means for connection to a flame spray nozzle of an autogenous flame-spraying apparatus for optimizing the working parameters of the apparatus including flame speed and kinetic energy is provided. The means comprises a hollow longitudinally extending module of tubular configuration through which flame spray material is caused to flow. The extending module has a predetermined length with one end portion thereof shaped for coupling to the flame spray nozzle and for providing a combustion chamber therefor, with its opposite end portion providing an exit end therefor. A portion of the hollow module extending from the combustion chamber to the exit end coaxially defines an extending accelerating chamber which is divided into a first stage chamber of specified diameter following the combustion chamber and a second stage chamber in which the diameter thereof less than that of the combustion chamber.

Abstract: A process for producing a protective metal layer on tubes used in firing installations comprises thermal spraying on the tubes an atomized powder being formed from an alloy which comprises from about 15 to 35% Cr, from about 0.05 to 5.0% Mn, from about 0.01 to 3.0% C, from about 0.1 to 3.0% Si, from about 0.1 to 8.0% Mo, from about 2.0 to 15.0% Al, and balance Fe.

Abstract: A method is provided for flame-spraying powdered materials onto a substrate by means of an autogenous flame-spraying apparatus of the type in which a combustion gas-oxidation gas mixture is produced and ignited at the outlet of a burner nozzle with the powdered material conveyed by a carrier gas to the burner nozzle and introduced in the flame at the outlet of the burner nozzle. The working parameters of the flame-spraying apparatus are chosen so as to provide an energy constant P.sub.E which together with the kinetic energy E.sub.k of the particles enables the use of a broad range of flame speeds.

Abstract: An apparatus for the flame spraying of powder materials by means of an autogenous flame comprising a nozzle carrier which has a burner nozzle and which projects into a guide opening of a preferably tubular attachment body provided with coolant guide means surrounding the burner nozzle, in particular an attachment body which is provided with an accelerating tube, is to be improved in that the nozzle carrier (10) is surrounded by a nozzle means (30) for construction of the flame and the nozzle means has an outlet opening or openings for constricting gas, the opening or openings extending axially or radially relative to the burner nozzle (11). The constricting gas is supplied through an annular stabilization chamber (28). In an embodiment the stabilization chamber (28) is of variable and is provided with an annular discharge gap (34) as the outlet opening.

Abstract: An apparatus for flame spraying, in particular of powder material by means of an autogenous flame, comprising a nozzle carrier which has a burner nozzle and which can be connected to a preferably tubular accelerating accessory device which is provided with coolant guide means surrounding the burner nozzle, is improved in that the accelerating accessory device (40) bears slidably against a central arm (12) of the nozzle carrier (10) with an axial portion (45), a conical region (44) adjoins the axial portion (45) at a position remote from the nozzle, and a portion (42) which outwardly embraces a combustion chamber (50) adjoins the conical region (44), wherein the combustion chamber is delimited towards the burner by a movable annular body (38). In addition the burner nozzle (9) is to be disposed approximately in one plane with flame outlet openings of the accelerating accessory device (40) and is adapted to be retracted and extended.

Abstract: A process for producing a corrosion-resistant protection on stabilizing wall surfaces and superheater tubes in sulfur-bearing hot gases which are used at surfaces temperatures of over 400.degree. C. in combustion installations, and a material in powder form which is suitable for that process, are intended to make it possible to use such wall surfaces and superheater tubes in sulfur-bearing hot gases in a good and durable fashion.For that purpose, to form a protective layer which is preferably from 0.2 to 1.5 mm in thickness, a metal powder which is sprayed out of a molten state, of a given composition, with a surface area of more than 200 cm.sup.2 /g, is applied with an autogenous flame spray torch, with a quantitative gas flow rate of between about 1000 to 3000 NL/h, or 1500 to 2500 NL/h, for the combustion gas. The preferred composition of the metal powder used in Cr 15% to 35%, Mn 0.05% to 3%, Mo 0.05% to 5.0%, C 0.1% to 3%, Si 0.1% to 3%, Al 2% to 15%, with the balance Fe.

Abstract: A method is provided for producing a wear-resistant layer on a metal base. A material, containing about 10 to 50% by weight of TiC in the form of sintered or agglomerated particles in which TiC is dispersed in a matrix alloy selected from the group consisting of iron, nickel and cobalt alloys, is applied to a metal base by thermal spraying. The sprayed-on layer is subjected to heat treatment to provide precipitation hardening by virtue of the precipitation of TiC as uniformly dispersed fine grains. The sintered or agglomerated particles containing TiC have a grain size of -150 to +37 .mu.m. The layer is applied by autogeneous flame spraying to a thickness of at least about 1 mm.

Abstract: A torch device with a torch body having separate ducts for oxygen and combustion gas supply is disclosed, wherein regulating and shut-off valves are provided in the torch body in substantially opposite relationship. A common actuating device for the shut-off valves is adapted for completely closing the shut-off valve for the combustion gas before starting the closing of the shut-off valve for oxygen. All gas ducts inside the torch body are formed by bores extending parallely to each other, while connecting passages are formed by bores extending orthogonally thereto.

Abstract: A flame spray torch for the manufacturing of surface layers on workpieces by spraying thereon powdered materials is provided. The flame spray torch comprises a torch body with respective conveying ducts for oxygen, for a combustion gas and for a powder-carrier gas mixture, including an outlet opening in the torch body for the powder-carrier gas mixture. The torch also has a powder supply duct extending in the torch body, an insert part in the conveying duct for the powder-carrier gas mixture capable of being inserted therein from the outlet opening, the outlet opening communicating with the powder supply duct. An axial inlet opening is provided in the torch body communicating with the inlet opening of the insert part through an extension duct.

Abstract: A powdery material is prepared by atomization from a molten alloy having the following composition in weight percent: chromium: 10-30; aluminium: 1-25; carbon: less than 0.5; nickel: less than 10; iron: the balance, with a cooling speed at least equal to 400.degree. C./sec., for heat spraying having a grain size comprised between -150 and +27 microns of which the specific area is higher than 500 cm.sup.2 /g. Said material enables to form on a metal substrate a self-adhesive layer having a resistance to pulling by traction which is higher than 20 N/mm.sup.2.

Abstract: A powdered material is provided for thermal spraying comprising a mixture of self-fluxing matrix allow powder and a powder of at least one metal carbide, the carbide content of the mixture consisting essentially between 20 and 80 percent by thereof and the matrix alloy having the following composition, in percent by weight:______________________________________ Cr 18.0-35.0% Fe 0.1-25.0% B 0.5-4.5% Si 0.5-5.5% C 0.01-2.0% Mo 0-15.0% Nb 0-2.0% Ni Remainder.

Abstract: The material according to the present invention comprises a self-flowing alloy containing particularly from 18 to 35% by weight of chromium as well as fractions of boron and silicon in a ratio of 3:4. The alloy also contains from 0.1 to 25.0% by weight of iron, except for the range from 1.5 to 6. The layers obtained by means of said material exhibit a very high resistance to temperatures, particularly also to corrosion and oxidation.

Abstract: A flame spray powder composition is provided for the thermal coating of workpieces comprising a mechanical mixture of hard particles of material and particles of a matrix-forming self-fluxing alloy selected from the group consisting of Ni-base, Fe-base and Co-base self-fluxing alloys. The hard material is a fused tungsten carbide alloy consisting essentially by weight of about 3 to 7% C, an effective amount of iron ranging up to about 3%, up to about 2% total of other alloying elements and the balance essentially tungsten. Substantially each of the fused tungsten carbide alloy particles is characterized by a metal coating having a melting point higher than the melting point of the self-fluxing alloy and having an average particle size less than about 75 microns. The proportion by weight of the coated hard particles in the mixture ranges from about 10% to 95%, with the balance essentially said self-fluxing alloy.

Abstract: A powder mixture for thermal spraying is disclosed which comprises at least two powders of alloys with a different hardness in the range from 200 to 650 Hv and/or a different static coefficient of friction in the range from 0.01 to 0.3 .mu.s.The protective layers obtained by thermal spraying of the mixture have a heterogeneous, lamellar structure with low internal tensions even at substantial thickness, they have high resistance to frictional wear and very good frictional properties.

Abstract: Method of producing protective coatings on metal parts to be used in contact with molten glass.The method of the invention comprises spraying onto the surface to be coated, by a thermal spraying process such as flame or plasma spraying, a powdered material consisting essentially of at least 60% by weight of chromium oxide, from 0 to 40% by weight of a nickel-base alloy such as a nickel-chromium alloy and from 0 to 20% by weight of metal oxides such as aluminum, titanium and zirconium oxides.

Abstract: A safety burner for spraying metal powder in the molten state is provided comprising a burner body and a powder supply device formed of a carrier part firmly connected to the burner body and having an intermediate part removably attached to the carrier part, the intermediate part having means for detachably coupling a powder container thereto and also having a powder shutoff device cooperably associated therewith, the intermediate part and the carrier part being arranged one to the other such that the intermediate part can be removed from the carrier part only when the powder shutoff device is closed. The burner also includes gas flow conduits within it for conveying combustible gas and an oxidizing gas and powder-carrier gas therethrough. The burner body contains a first combustible gas-oxidizing gas injector and a second powder-carrier gas injector, the first injector being coupled to the combustible gas-oxidizing gas conduit and the second injector being coupled to the powder-carrier gas conduit.

Abstract: The invention relates to an installation for surfacing by plasma-arc welding including in particular a plasma torch and a control and power supply device for the formation of a transferred arc between the electrode of the torch and the workpiece to be surfaced and of a non-transferred arc between the said electrode and the nozzle of the torch, the control and power supply device comprising a single d.c. source one terminal of which is connected to the electrode of the torch and the other terminal of which is connected, on the one hand, to the workpiece to be surfaced and on the other hand to the nozzle of the torch via a resistance. The plasma torch has at least two cooling systems supplied by a distribution device which is controlled as a function of the cooling water temperature and/or the electrical power consumption of the torch.

Abstract: A safety double injector spray device or torch is provided for applying a spray coating to a substrate comprising, a torch body having a torch head at the end thereof, an oxygen duct and a fuel gas duct associated with said spray device and coupled to a first injector means for mixing oxygen and fuel gas therein, a fuel gas-oxygen mixing duct located forward of and coupled to said first injector means, a carrier gas duct associated with said spray device coupled to a second injector means for mixing spray powder with carrier gas fed to said duct, a carrier gas-spray powder mixing duct located forward of said second injector means, spray powder feeding means coupled to said torch body and communicating in powder feeding relationship with said carrier gas duct, and means forward of said first and said second injector means coupling said carrier gas-spray powder mixing duct and said fuel-gas oxygen mixing duct to said torch head.