EP1358943A1 - Method and apparatus for electric arc spraying - Google Patents

Abstract

Arc spraying uses spray gun (1) with 2 electrically conductive spray wires (2) and first supply device (3) to supply fluid(4), with electrical voltage applied to wires. The wires are fed by wire guide (5), an arc (6) being ignited by the voltage. The wires are converted into melt (8) in melting region (7) and the melt is applied to the fluid to surface (9) of body (10). Particles (11) from storage container (12) are supplied to the melt. An Independent claim is also included for an apparatus for arc spraying comprising the spray gun that includes the wire guide and first supply device.

Description

The invention relates to a method for arc spraying, and a Arc spraying device according to the preamble of independent claim of the respective category.

Arc spraying, often more precisely in the specialist literature than Arc wire spraying is a common technology for Production of surface layers on workpieces, for example against mechanical wear, corrosion or against chemical or thermal stresses are to be protected.

In arc spraying, a wire or tubular spray medium in the form of two spray wires in one melted electric arc and by an atomizing gas, e.g. by nitrogen, an inert gas or simply by air under a predefinable one Atomized pressure on a material surface. This is the arc between the two ends of the spray wires by applying one electrical voltage and contact ignition initiated. That is the difference for so-called "flame spraying", a process in which the thermal energy for melting the spray wire through a fuel gas-oxygen flame is applied while the arc spraying in Arc released electrical energy the necessary thermal energy for melting the spray wires.

Because the material of the spray wires in the area of the arc in the melt transferred and sprayed onto the surface of the workpiece, the Spray wire from a wire supply continuously through a wire feeder be tracked. Depending on the requirement, there are stationary spray guns known, often in automated operation for processing large series Find application, or also relatively small hand guns that one Allow more flexible use. The device for wire feed can both installed in the spray gun itself or by one wire feed unit located outside the spray gun become.

The properties of the sprayed layers can be checked various parameters, such as the wire diameter, the Material of the spray wire, the speed of the wire feed, the electrical voltage for generation or electrical current for Maintaining the arc, choosing the atomizing gas as well directly affect its working pressure or spraying distance. That usually means a change in one or more of these (or other parameters not mentioned here for layers with different properties and quality. Because the aforementioned Parameters by choice of materials or by electronic control and / or Control devices are generally easy to influence, draws arc spraying is characterized by a high degree of flexibility. For example can include the drop size or the kinetic energy of the Splash drops in a simple way, even during a running one Coating process, automatically set according to requirements become. In addition, the spraying process can even be more ordinary Ambient atmosphere, in a vacuum chamber or under one Shielding gas take place. This allows a wide selection of the most varied Workpieces with a wide variety of properties and properties Quality with the process of arc spraying with protective Surfaces are provided.

One disadvantage of the known methods for arc spraying is therein see that at the wire materials that are used as material for the manufacture of the Spray wires come into question to have very specific requirements are. The spray wires must have sufficient ductility, i.e. one sufficiently high ductility and / or extensibility and sufficient have high electrical conductivity. Should be electrically bad or not conductive or relatively hard, i.e. less ductile components, such as for example, ceramics, introduced into a layer to be sprayed so-called cored wires must be used. Under Cored wires are spray wires, in which the base material of the Spray wire additional components, mostly in the form of discrete particles are stored, which do not melt in the arc, or only melt and built into the sprayed surface layer. Are the volume of the particles is severely limited and some can already changed in structure by the melting process of the spray wire which often leads to undesired modifications in the layer. Also, the volume fraction of the particles in the melt is practically impossible can be changed in a controlled manner, as this is caused by the distribution of the particles in Cored wire is fixed. Also the size, shape and type of the particles can only be replaced by replacing the cored wire and thus during the Spraying process itself can not be changed. In addition, electrically can not Conductive particles in the spray wire disturb the stability of the arc and therefore the quality of the sprayed surface layer lastingly negative influence. In addition, the production of cored wire is compared to ordinary spray wires correspondingly complex and expensive.

The object of the invention is therefore to provide a method for arc spraying propose by means of a spray gun that allows it to be sprayed from the Base material of the spray wires melt produced additional solid particles, in particular electrically poor or non-conductive and / or less ductile Introduce particles in such a way that the stability of the arc is not affected and the use of cored wire is avoided can be. It is also an object of the invention to provide a corresponding one Propose arc spraying device with a spray gun.

These tasks in terms of process engineering and equipment Solving objects of the invention are characterized by the features of marked independent claim of the respective category.

The respective dependent claims relate to particular advantageous embodiments of the invention.

According to the invention, a method for arc spraying is thus used proposed a spray gun, which spray gun two electrically conductive Spray wires and at least one first feed device for feeding a Fluids comprises, wherein an electrical voltage is applied to the spray wires is, the spray wires are tracked by means of a wire guide the electrical voltage is ignited, the spray wires in a melting range can be converted into a melt and the melt is applied by the fluid to the surface of a body. there the melt particles are removed from a reservoir by the fluid fed. By using the method according to the invention additionally particles into the melt and thus into the one to be generated Surface layer are introduced, with the use of Cored wires can be dispensed with.

To carry out the inventive method for Arc spraying comes in a preferred embodiment Device with a known spray gun for use. The Arc spraying device comprises a spray gun, a Wire guide for feeding two spray wires, a gas supply, the one Fluid, preferably a gaseous fluid under an adjustable working pressure provides an energy source that is suitable for the To supply spray wires with electrical energy, as well as a free programmable control unit for setting various Process parameters. The spray wires are made from a storage device fed a wire guide that a wire feed and a Includes management facility. The wire feed, which is either in the Spray gun itself or in an external facility can, the spray wires from the storage device on the Guide device in a melting range such that between the an arc was ignited and sprayed over both spray wires in the melting area a stable period of time can be maintained. The Guide device is preferably designed so that it is electrical conductive device is connectable to the energy source and with the Spray wire is in electrically conductive contact, so that over the Guide device the necessary for the generation of the arc electrical energy can be supplied to the spray wire. Of course, the guide device can also against the spray wires be electrically isolated, the electrical energy then the Spray wires are fed in a different way. Because with arc spraying in the melting range the material of the spray wire continuously into one The melt wire is transferred, the spray wire to maintain the Arc through the wire guide continuously into the melting area be tracked.

The gas supply is above a first feed device, which is, for example, in Form of a pressure line can be configured, such with the Melting range in connection with that caused by the arc in the Melting area melt produced from the material of the spray wire acted upon by the fluid with an adjustable working pressure and so on the surface of a workpiece to be coated is applied, wherein the fluid is preferably a gas, in particular an inert gas such as helium or Argon, or an inert gas such as nitrogen or oxygen or Ambient air can include.

The inventive device for arc spraying has in Compared to the prior art, a storage container, which in a preferred embodiment of the device according to the invention is connected to the first feed device by suitable means, so that solid particles can be supplied to the fluid. The melt is thereby the fluid flow comprising the fluid and the supplied solid particles, via the first feed device with an adjustable working pressure acts on the particles that are fed to the melt and together with the melt formed from the spray wires towards the surface of a coating body are applied. It is possible that the Particles from different storage containers are fed to the melt can, so the number and type of the fluid in the form of particles supplied materials adjusted in a controlled manner during the spraying process can be. It is also possible that the reservoir and the Gas supply can be formed by a common container.

In another preferred embodiment of a device for Arc spraying according to a method according to the invention Particles by means of a second feed device through the fluid of the melt fed. The device includes in the same way and function that components already described, especially the first Feeding device, which, however, may only be used by the Arc generated in the melting area from the material of the spray wire Melt through the fluid with an adjustable working pressure act and so the melt to the surface of a to apply the coating workpiece.

Thus, this arc spraying device has in addition to the first one Feeder on a second feeder, which second Particle feed device by means of a fluid from a storage container can be fed, two or more storage containers also being present can. The storage containers are connected to a gas supply, which is below a specifiable working pressure fluid for transporting the particles to Provides. The same gas supply can be used with the first one Feeder, as well as in connection with the storage container. It However, two or more gas reserves can also be present, so that for example, the first feed device on the one hand and the storage containers on the other hand, be supplied with fluid from various gas stocks can. If there are several gas stocks, you can of course different fluids can be used simultaneously in one spraying process come. For example, it is possible for the melt to pass through the first Feeder from a gas supply with a first gas, e.g. Oxygen, is pressurized while the particles come from another Gas supply with a second gas, for example through an inert gas with a other working pressure applied via the second feed device Melt are fed. Of course, depending on your needs other fluids than the gases listed here as examples are also possible come. If there are several storage containers, the same or of course, everyone can provide different particles Storage containers are fed from one or more gas stores that can provide the same or different fluids.

The fluid becomes the particles by means of the second fluid Feed device fed from the storage container in such a way that the particles are mixed with the melt in the melting area and together with the melt is applied to the surface of the body by the fluid and thus become an integral part of the surface layer. The second feed device preferably comprises a nozzle device which is capable of moving the particles through the fluid at working pressure to bring the melt applied.

Of course, it is also possible for particles to pass through the first feed device and via the second feed device of the melt are supplied, wherein an inventive device for Arc spraying in addition to the first and second Feeder can also include other feeders.

The inventive device for arc spraying comprises As already mentioned, a freely programmable control unit, which it allows various process parameters such as the Working pressure of the fluid and / or the amount or type of Particles and / or the wire feed and / or other process parameters set individually according to a predefinable scheme.

The particles supplied to the fluid from the storage container can be in one preferred embodiment a ceramic and / or a carbide and / or a boride and / or a nitride, in particular hexagonal boron nitride (hBN) or cubic boron nitride (cBN) and / or a metal and / or a Include metal alloy. The size of the particles is between 1 µm and 200 µm and is preferably chosen between 5 µm and 80 µm. The Volume fraction of the particles that are supplied to the fluid from the reservoir be variable or fixed, so that the volume fraction the particles in the layer sprayed by the method according to the invention between 0.1% and 40% of the total volume of the applied Surface layer is. The volume fraction of the particles is preferably in the sprayed surface layer between 1% and 20%.

The device according to the invention can have several storage containers have different types of particles, with the particles coming from different materials and / or different Size can be the fluid from the different storage containers fed and the composition of the particle stream through the Control unit continuously changed according to a predefinable scheme can be. This makes it possible to change both the structure and the Composition of the surface layer to be sprayed also during constantly adapting to a spraying process, which means that workpieces can also be strongly structured surfaces always optimal in all surface areas can be coated.

A particular advantage of the method according to the invention for Arc spraying is that the particles with the fluid in the Melt are introduced and not by using a cored wire the coating process. This makes the particles far less restricted in volume and have no negative Effects on the stability of the arc and the melting process. Depending on the materials used and / or those used in arc spraying selected parameters can be the particles introduced into the melt already on their way to the surface of the body to be coated either completely or partially enclosed by the molten phase be, for example, within small droplets that form when the Have formed melt, or only on the surface of the coating body from the molten phase, before or during solidification during layer formation.

In a special embodiment variant of the invention Process include the particles, for example oxidic ceramics or Carbides and are essentially not melted in the injection process, but in a carrier layer, which is largely made of the material of the Spray wire is built up, matrix-like in the sprayed surface layer built-in. The resulting surface layer can, depending on the type of built-in particles, have very different properties. in the Comparison to surface layers, which are known with known methods for Arc syringes can be produced, for example, by Use of hard ceramic particles significantly improved Wear resistance of the sprayed surfaces can be achieved. For example, by the method according to the invention Wear protection layers for brake disks can be produced, among other things can be used in vehicles whose brake discs are frequent braking operations are constantly heavily loaded. This is the case, for example on trucks, trams, buses and other vehicles, especially in local transport too, which is frequent and at short intervals relative large masses have to slow down. By using the Methods according to the invention can be applied to the brake discs of such Vehicles for the first time are sprayed on with wear protection layers that even the lifespan of the corresponding vehicle lasts. The economic benefits arising from the use of such Wear protection layers are obvious. It is Of course, the method according to the invention does not relate to the production of Wear protection layers for brake discs limited, but can be used Example also for the coating of smooth or crepe cylinders (so-called Drying cylinders) for the production of papers in the paper industry or can be used successfully in many other areas. Next Protective layers on surfaces of workpieces can even free-standing body made of MMC (Metal Matrix Composite).

It is also possible that the particles are essentially dry lubricants such as hexagonal boron nitride (hBN) or other materials, resulting in increased lubricity and / or improved abrasive Surface properties can be achieved. For example moving components in turbines of all kinds, the high temperatures and / or are exposed to strong mechanical loads and certain have sealing functions with such layers by using the be equipped according to the inventive method.

In addition, it is even possible that the particles are also in the arc be melted so that a more or less homogeneous Mixture of melt and molten particles is formed what then to correspondingly more homogeneous structures in the surface layer leads. For example, the particles that make up the fluid from the Storage containers are supplied, materials such as metals or Include metal alloys. By feeding such particles into the from the Material of the spray wire formed melt can in the melt Example, an alloy can be formed, one of the material of the Spray wire different composition or from the material of the Spray wire has different properties.

The properties of the sprayed surface layer can furthermore also be influenced by the fluid itself, which is used in the spraying process Application of pressure to the melt and / or to supply the Particle is used. For example, the fluid can have an increased content to include oxygen so that the materials comprising the melt and / or the particles already to a certain extent during the spraying process oxidize, reducing the chemical and physical properties of the sprayed surface can be positively influenced.

The inventive device for arc spraying with a Spray gun includes a wire guide for tracking two electrical conductive spray wires and at least a first feed device for Supply of a fluid to which spray wires an electrical voltage can be applied so that an arc can be ignited and thereby the spray wires can be converted into a melt in a melting range, the Melt can be applied through the fluid to the surface of a body. Means are provided on the device according to the invention in order to Melt through the fluid to supply particles from a storage container.

The fact that means are provided to pass the melt particles through the Feeding fluid can lead to the use of cored wire as spray wire to be dispensed with. Different types of particles are the fluid can be fed separately from several different storage containers or in one or more storage containers are mixtures of different types of particles available and the fluid from the Storage containers can be supplied.

Fig. 1

die wesentlichen Teile eines Ausführungsbeispiels einer Vorrichtung zum Lichtbogenspritzen nach einem erfindungsgemässen Verfahren;

Fig. 2

wie Fig. 1 für ein weiteres Ausführungsbeispiel einer Vorrichtung zum Lichtbogenspritzen;

Fig. 3

ein Beispiel einer Schicht auf einer Oberfläche eines Körpers, aufgebracht durch Lichtbogenspritzen nach einem erfindungsgemässen Verfahren.

The invention is explained in more detail below with reference to the drawing. In a schematic representation:

Fig. 1

the essential parts of an embodiment of a device for arc spraying according to a method according to the invention;

Fig. 2

as Figure 1 for a further embodiment of a device for arc spraying.

Fig. 3

an example of a layer on a surface of a body, applied by arc spraying according to a method according to the invention.

Fig. 1 shows a preferred representation in a schematic representation Embodiment of an inventive device for Arc spraying with spray gun 1, first feed device 3, Storage container 12 and control unit 14 for arc spraying after a method according to the invention. The spray gun 1 comprises in known manner two electrically conductive spray wires 2, which are used for supply are connected to an energy source 16 with electrical energy, so that An arc 6 between the spray wires 2 in a melting area 7 ignited and maintained stable for a definable period of time can be. The spray wires 2 are from a not shown Storage device of a wire guide 5 can be fed. The wire guide 5 comprises a wire feed 13, which is suitable for the spray wire 2 to be fed to the melting region 7 by a guide device 17. The Guide device 17 is preferably designed such that it is electrical conductive device can be connected to the energy source 16 and with the Spray wire 2 is in electrically conductive contact, so that over the Guide device 17 necessary for the generation of the arc 6 electrical energy can be supplied to the spray wire 2. Since at Arc spraying in the melting area 7 continuously material of the Spray wire 2 is transferred into a melt 8, the spray wire 2 to Maintaining the arc 6 continuously through the wire guide 5 be tracked into the melting range 7.

The melt formed from the material of the spray wire 2 in the arc 6 8 is made by a fluid 4 via a first feed device 3 Gas supply 19 applied to a surface 9 of a body 10. By the Fluid 4, which is preferably a gas, in particular oxygen, nitrogen, argon, Is helium, ambient air or another gas, the melt 8 with a specifiable working pressure, whereby the melt 8 the surface 9 of the body 10 is thrown, the melt 8 on the Surface 9 of the body 10 condensed into a solid state and so one Surface layer 18 with predefinable properties on the surface 9 of the body 10 forms.

A device for arc spraying according to the invention further has means 15 with which particles 11 can be supplied to the fluid 4 from a storage container 12, wherein, as shown by way of example in FIG. 1, two or more storage containers 12 can also be present. In this case, the particles 8 are supplied to the melt 8 by the fluid 4 from the storage container 12 in such a way that the particles 11 are mixed with the melt 8 in the melting area 7 and applied together with the melt 8 to the surface 9 of the body 10 by the fluid 4 and thus become an integral part of the surface layer 18. The particles 11 preferably comprise a ceramic, in particular aluminum oxide (Al ₂ O ₃ ), chromium oxide (Cr ₂ O ₃ ), titanium oxide (TiO ₂ ), zirconium oxide (ZrO ₂ ), and / or a carbide, in particular tungsten carbide (WC), chromium carbide (Cr ₃ C ₂ ), titanium carbide (TiC), tantalum carbide (TaC), iron carbide (Fe ₃ C), niobium carbide, vanadium carbide and / or a boride and / or a nitride, such as hexagonal boron nitride (hBN) or cubic boron nitride (cBN) , and / or a metal and / or a metal alloy. In this case, the particles 11 are preferably not melted substantially, but rather are built into the surface 18 in a matrix-like structure. However, it is also conceivable that the particles 11 are also melted and mixed with the melt 8, for example to form an alloy, so as to form an essentially homogeneous surface layer 18.

For control and / or regulation, an according to the invention Arc spraying device a freely programmable Control unit 14 with which the working pressure with which the fluid 4 Melt 8 applied, and / or the amount and / or type of Particles 11 and / or the wire feed 13 and / or the spray wires 2 supplied electrical energy and / or a further process parameter can be set individually. For example, the gas supply 19 and / or the wire guide 5 and / or the reservoir 12 and / or the Energy source 16 and / or further components of the inventive Device connected to the control unit 14 via control lines 20. Furthermore, the control unit 14 can include sensor lines 21, by the control unit 14 of sensors, not shown various operating parameters, such as current working pressure, Gas pressure in the process chamber, ambient pressure, temperature, electrical Operating parameters of the energy source or other parameters, communicable are.

Fig. 2 shows schematically another embodiment of a device for arc spraying according to a method according to the invention Spray gun 1, a first feed device 3, reservoir 12 and Control unit 14. In the exemplary embodiment shown here, the Particles 11, however, by means of a second feed device 31 of the melt 8 supplied by the fluid 4. The spray gun 1 includes the same Way and function of the known components of a previously described Spray gun 1 for arc spraying. Of course, the in Fig. 2 device shown, also in the same way and function that already described further components of an inventive Device, the first feed device 3 possibly only the Supply of fluid 4 to apply the working pressure to the melt 8 can serve. In particular, the device shown in FIG. 2 also has an energy source 16 on whose representation here for the sake of Clarity was dispensed with.

The melt formed from the material of the spray wire 2 in the arc 6 8 is analogous to the previously described embodiment here as well through a fluid 4 via a feed device 3 from a gas supply 19 a surface 9 of a body 10 is applied. Through the fluid 4, the preferably a gas, in particular nitrogen, oxygen, argon, helium, Is ambient air or another gas, the melt 8 with a Predefinable working pressure, whereby the melt 8 on the Surface 9 of the body 10 is thrown, the melt 8 on the Surface 9 of the body 10 condensed into a solid state and so one Surface layer 18 with predefinable properties on the surface 9 of the body 10 forms.

The embodiment shown in FIG. 2 of an inventive Arc spraying device also has means 15 with which from a reservoir 12 of a second feed device 31 by means of a Fluids 4 particles 11 can be supplied, as shown by way of example in FIG. 2, two or more storage containers 12 can also be present. The Storage containers 12 are connected to a gas supply 19, which is under a Predeterminable working pressure fluid 4 for conveying the particles 11 to Provides. The same gas supply 19 can be used with both the first one Feed device 3, as well as with the reservoir 12 and / or second feed device 31 are connected. However, As shown by way of example in FIG. 2, two or more gas supplies 19 are present be, so that for example the first feed device 3 and the Storage container 12 and / or the second feed device 31 various gas supplies 19 are supplied with fluid 4. Are several Gas stocks 19 available, so of course, different Fluids 4 are used simultaneously in one spraying process. That's the way it is for example possible that the melt 8 through the first Feeder 3 from a gas supply 19 by oxygen at working pressure is acted upon while the particles 11 from another gas supply 19, for example by using an inert gas with a different working pressure pressurized, fed to the melt 8 via the second feed device 31 become. Of course, other fluids 4, than the gases listed here as examples. If several Storage containers 12 are present, the same or different particles 11 can provide, of course, each reservoir 12 one or more gas supplies 19 are fed, the same or can provide different fluids 4.

Here, the melt 8 through the fluid 4, the particles 11 by means of second feed device 31 fed from the reservoir 12 in such a way that the particles 11 are mixed in the melting region 7 with the melt 8 be and together with the melt 8 on the surface 9 of the body 10 applied by the fluid 4 and thus an integral part of the Surface layer 18 are. The second preferably comprises Feed device 31 a nozzle device 32 which is suitable for the Particles 11 into the melt pressurized by the fluid 4 8 to bring.

Fig. 3 shows a schematic representation of an example of a Surface layer 18 by arc spraying after a Method according to the invention on the surface 9 of a body 10 was applied. In the example shown here, this was done with Working pressure applied fluid 4 from the reservoir 12 to particles 11 supplied and the melt 8 formed in the arc 6 by the fluid 4 and particles 11 formed particle stream on the surface 9 of the body 10 hurled. The particles 11 used in this exemplary embodiment were essentially not melted, but in one Carrier layer 22, which largely (from which by the arc 6th melted) material of the spray wire 2, matrix-like built-in. The surface layer 18 formed in this way can, for example, each according to the type of particles 11 compared to surface layers 18, which were produced using known methods for arc spraying, have significantly improved wear resistance.

For example, by the method according to the invention Surface layers 18 can be produced for brake discs, which, among other things, in Vehicles can be used, the brake discs through frequent braking operations are constantly heavily loaded. Among other things, this applies on trucks, trams, buses and other vehicles, especially in local transport too, which is frequent and at short intervals relative large masses have to slow down. This is according to the invention Of course, the process does not apply to the production of Surface layers 18 limited for brake discs, but can be used Example also for the coating of smooth or crepe cylinders (so-called Drying cylinders) for the production of papers in the paper industry or can be used successfully in many other areas. Next Surface layers 18 on surfaces 9 of workpieces can even free-standing bodies, for example made of MMC (Metal Matrix Composite) be injected.

It is also possible that the particles 11 essentially Dry lubricants, such as hexagonal boron nitride or others include, increasing lubricity and / or improved abrasive properties of the surface layer 18 can be achieved. Of course, it is also possible that the particles 11 are also in the Arc 6 are melted, so that a more or less homogeneous mixture of melt 8 and melted particles 11 is formed, which then leads to correspondingly more homogeneous structures in the Surface layer 18 leads.

The fact that the supply of the particles 11 to the melt 8 from different Storage containers 12 take place and the amount and / or type of supplied Particles 11 can be set individually for each storage container 12 it is also possible to produce surface layers 18 in one operation, their properties over the surface layer 18 from place to place and / or vary across the thickness of the surface layer 18, i.e. it can too Predeterminable concentration profiles of particles 11 in the surface layer 18 are generated. For example, it is possible to use surface layers 18 manufacture, their abrasive properties and / or their Wear resistance varies from place to place or increases with increasing Change shift removal in a specifiable manner.

The inventive method for arc spraying by means of a Spray gun allows in the generated from the material of the spray wires Melt additional solid particles controlled by a working pressure to apply pressurized fluid, so that the use of expensive Cored wires can be dispensed with. By making the particles out various storage containers through the fluid of the melt after a Predeterminable scheme can be supplied if necessary at the same time different types of particles of different sizes and chemical Composition are introduced into the layer to be sprayed. Thereby it becomes possible to use surface spraying with arcing improved properties and a greater variety of possible structures and composition.

Claims (12)

Process for arc spraying by means of a spray gun (1) which comprises two electrically conductive spray wires (2) and at least one first feed device (3) for feeding a fluid (4), an electrical voltage being applied to the spray wires (2), the spray wires (2) are guided by means of a wire guide (5), an electric arc (6) is ignited by the electrical voltage, the spray wires (2) are transferred to a melt (8) in a melting area (7) and the melt (8) is passed through the fluid (4) is applied to the surface (9) of a body (10), characterized in that the melt (8) is supplied with particles (11) by the fluid (4) from a storage container (12). The method of claim 1, wherein the fluid (4) is the melt (8) with an adjustable working pressure. The method of claim 1 or 2, wherein the particles (11) by means of a second feed device (31) of the melt (8) through the Fluid (4) are supplied. Method according to one of the preceding claims, in which the fluid (4) is a gas, in particular an inert gas such as helium or Includes argon, or nitrogen or oxygen Method according to one of the preceding claims, in which the particles (11) are a ceramic, in particular Al ₂ O ₃ , Cr ₂ O ₃ , TiO ₂ , ZrO ₂ , and / or a carbide, in particular WC, Cr ₃ C ₂ , TiC, TaC, Fe ₃ C, diamond niobium carbide, vanadium carbide and / or a boride and / or a nitride, in particular cBN or hBN and / or a metal and / or a metal alloy. Method according to one of the preceding claims, in which the Size of the particles (11) between 1 µm and 200 µm, preferably between 5 µm and 80 µm is selected. Method according to one of the preceding claims, in which the Wire guide (5) a controllable or adjustable wire feed (13) includes. Method according to one of the preceding claims, in which the Working pressure of the fluid (4) and / or quantity supplied and / or type of particles (11) and / or the wire feed (13) and / or a any other process parameters using a free programmable control unit (14) can be set individually can. Method according to one of the preceding claims, in which Particles (11) made of different materials and / or particles (11) of different sizes the fluid (4) from different Storage containers (12) are fed to the composition of the To change particle flow. Device for arc spraying with a spray gun (1), which comprises a wire guide (5) for tracking two electrically conductive spray wires (2) and at least one first feed device (3) for supplying a fluid (4), to which spray wires (2) an electrical one Voltage can be applied, so that an arc (6) can be ignited and thereby the spray wires (2) can be converted into a melt (8) in a melting area (7), the melt (8) through the fluid (4) onto the surface (9) of a body (10) can be applied, characterized in that means (15) are provided in order to supply the melt (8) through the fluid (4) with particles (11) from a storage container (12). Apparatus according to claim 10, which comprises a second feed device (31), which is suitable for the melt (8) particles (11) supply. Wear part, in particular brake disc for a vehicle or Smooth or crepe cylinder for paper making, which after a Method according to one of claims 1 to 9 or with Device according to claim 10 or 11 was coated.

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