Coating application process

FIELD: weapons and ammunition.

SUBSTANCE: proposed process comprises preliminary barrel etching and shot blasting. Then, first layer of nickel is applied by electrolytic process. Then, heat treatment is performed by high-temperature annealing at 600-610°C at heating and cooling rate of not over 15°C/min. Now, second layer is applied by slip process from slip composition, containing the following components in wt %: fine powder (Al, Cr, Ni, Fe) - 45-50%; chromic anhydride - 3%; surfactant - 0,2%, chromia-alumina-phosphate binder making the rest.

EFFECT: higher wear resistance, homogeneous improved chemical composition of gun barrel.

3 cl

 

The invention relates to the field of engineering, in particular to the section of chemical-heat treatment of alloys, and is aimed at improving the wear resistance of parts of small arms, for example, precision rifles and sniper rifles by protecting their parts from corrosion.

There is a method of coating ceramic parts according to the patent RU 2152842 C2 is selected as the similar. This method includes a three-layer coating with drying of each layer in air for one hour and curing the coating by mode: temperature rise from 20-300°C with a speed of 1-2 degrees per minute, holding at 300°C for 3 hours. The first (outer) and the third (inner) layer is applied from alumbramiento binder, the second (intermediate) layer is applied from alumbramiento binder together with alumina. Heat treatment of 300°C is carried out in three stages. First up to 150°C with a holding time of 60 to 90 minutes, the second 15-250°C with a holding time of 50-60 minutes, the third 250-350°C with a holding time of 30-60 minutes. In addition, the first (outer) and the third (inner) layers is applied in an amount to provide a surface density of 0.05-0.2 kg/m2and the second (intermediate) is the density of 0.12-0.35 kg/m2. The disadvantages are the complexity of the operations, the high complexity.

The closest analogue (prototype) is a multilayer cover the Oia in patent RU 2214475 C2. This method includes three coating layers. The first layer is a heat-resistant coating based on Ni, the second layer is aluminum, silicon and yttrium, and the third layer is a ceramic. The first and third layers is applied isothermal method and the second method slip technology. After applying the second coat makes drying at a temperature of 350°C for 30-60 minutes and vacuum annealing. Slip floor consists of fine powder on the basis of aluminum with the addition of silicon (0.15 to 15 wt.%) and yttrium - 0.1 to 1.3 wt.%. The thickness of the first coating layer is 30-100 μm, the total thickness of the first and second layer after vacuum annealing is 30-100 μm, the thickness of the third layer 30-300 μm. The disadvantage is complex and labor-intensive technology, and the absence of guarantees of adhesion and corrosion resistance in atmospheric conditions.

The technical result of the claimed invention is to improve the wear resistance of the metal of the barrel firearms and improving the uniformity of the metal barrel of small arms and its chemical composition.

The technical result is achieved by a method of applying a coating on the barrel firearms includes pre-processing the surface of the barrel, the first layer of Nickel on the surface of the barrel, heat treatment, application of the second layer by the method of slip technology. If this is m surface treatment carried out first by etching, which includes removing the oxide film from the surface of the Al-alloy in 5-10% caustic soda solution at 20-70°C, and then shot peened cast aluminum balls. The first layer of Nickel to a thickness of 3-5 μm is applied by galvanic method. The heat treatment is carried out using high-temperature annealing at a temperature of 600-610°C with heating rate and cooling is not more than 15°C / minute in an inert atmosphere (argon). The second layer is applied from the slip composition, wt.%:

- fine powder (Al, Cr, Ni, Fe) - 45-50%;

- chromic anhydride - 3%;

- surface-active substance is 0.2%;

- alumbramiento binding - rest.

Acceptable way to achieve adhesion of the Nickel (Ni) substrate is the creation of a developed surface and compressive stresses in the surface layer A1-alloy (substrate) due to the blasting process and to improve conditions for diffusion bonding of Ni from the substrate during high temperature annealing (temperature 600°C). Slow heating to a temperature of 600°C with a speed of 10-12°C / minute eliminates deformation of structural elements of the barrel, having a different wall thickness, the presence of the complex shape of the grooves and the inner bore longer than 600 mm, made by drilling, and other construction elements, obtained by a mechanical impact. In addition, the heat allows jet to relax (reduce) residual stresses in the metal of the barrel, as well as to create a homogeneous structure and to stabilize the chemical composition of the alloy barrel.

The source of residual stresses in the alloy barrel is a mechanical effect upon its mechanical and shot peened. For example, the fraction, leaving the nozzle at a certain speed, hits the surface of the metal, causing plastic deformation. Consequently, in the surface layer there are residual pressure at a depth of 0.15-0.4 mm, and thickened in places up to 0.5 mm. it Should also be noted that the use of a fraction the size of 1,5-2 mm allows on one hand to create a surface under conditions splicing with Ni-coating, and on the other hand, as noted above - to make the surface layer of residual compressive stress, also facilitate bonding of Ni-coating with the substrate. Processing of the barrel in the bath with a solution of caustic soda enables you to remove the oxide film, and subsequent rinsing in warm water cleans the surface of the barrel from the grout. Slight etching of the Al-alloy in an aqueous solution of nitric acid (1:1) and subsequent rinsing in water at room temperature, provides high-quality deposition of Nickel to a thickness of 3-5 μm on a substrate.

Heat-treated barrel after exposure at a temperature of 600°C and then slowly cooled at a rate not exceeding 15°C per minute allow you to plug the em to keep the metallic bond of the Nickel coating with Al-alloy barrel. Communication slip coating with Nickel is achieved using aluminophosphate binder contained in the metal powder of the following composition: Al, Fe, Cr, Ni, where Fe particle size of 40-60 nm. Additionally, with the substrate in the slurry is injected chromic anhydride 2-3 wt.% and surface active substances (surfactants), such as Hotfix VE" 0,2-0,3%, because this binder has adhesive properties and water resistance. The coating is applied from a spray bottle. The thickness of 30-50 μm. After coating are drying shaft furnace at a temperature of 160-180°C. the Furnace is heated together with the barrel to prevent the temperature gradient.

In the drying process to achieve high adhesion slip coating with Nickel having a diffusion bonding with the substrate.

Heat treatment with slow heating and cooling can:

- relax (reduce) residual stresses;

to ensure the uniformity of the structure and chemical composition;

to prevent deformation of the walls of the trunk.

The method of coating is as follows.

The barrel is made of aluminum alloy after the final machining is etched in a 7% solution of caustic soda at a temperature of 20-30°C for removing the surface oxide film. After this exercise drestroy the th treatment, where as fractions using aluminum alloy beads with a diameter of 1.5-2 mm, Then put a layer of Nickel plated 3-5 µm way. To promote adhesion of the Nickel to the substrate and relaxation (decrease) residual stresses introduced during machining (turning, drilling, milling etc)and shot peened to achieve a homogeneous structure and chemical composition, heat treatment was performed at a temperature of 590-610°C with a holding time of 30-35 minutes Heating and cooling process was carried out with a rate of 10-15°C per minute. A protective environment is argon. Then on top of the Nickel coating was applied slip coating composition: metal powder (Al, Cr, Ni and Fe, with the dispersion of 40-60 nm and aluminophosphate binder, chromic anhydride and surface active substances (surfactants), such as Hotfix VE". The percentage of these ingredients were:

water;

metal powder 50%;

- chromic anhydride 3%;

- surface active substances (surfactants), such as Hotfix VE" - 0,2%;

- aluminophosphate the rest of the binder.

The coating thickness of 10-12 μm. The application of the slip coating was carried out by sprinklers. Then was carried out by drying at 170°C ± 10°C in air atmosphere in a furnace at a shutter speed of 1 hour. The rate of heating and cooling was carried out with the oven.

1. Way on the Eseniya coating on the barrel firearms, includes pre-processing the surface of the barrel, the first layer of Nickel, heat treatment, application of the second layer by the method of slip technology, characterized in that the preliminary surface treatment carried out first by etching, and then by shot peening, the first layer of Nickel is applied by galvanic method, and heat treatment is performed by the method of high-temperature annealing at a temperature of 600-610°C with heating rate and cooling is not more than 15°C per minute.

2. The method according to claim 1, characterized in that the blasting treatment is carried out cast aluminum balls.

3. The method according to claim 1 or 2, characterized in that the second layer is applied from the slip composition, wt.%:

the fine powder (Al, Cr, Ni, Fe)45-50
chromic anhydride3
surface active substance0,2
alumbramiento binderrest



 

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2 tbl, 5 ex

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1 cl, 1 ex, 1 tbl

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