Method for protecting internal reactor surfaces from saturation with working medium components during chemical-thermal treatment of parts

FIELD: chemistry.

SUBSTANCE: method for protecting the internal reactor surfaces from saturation with the working medium components during the chemical-thermal treatment of parts involves the formation of a protective coating on the inner reactor surfaces, chemically neutral to the working medium. Initially, during the formation of the protective coating, from 3 to 10 nominal coating cycles are carried out on the part to produce a coating on the internal reactor surfaces from the working agent used in the chemical-thermal treatment, after which an idle cycle of the reactor operation is carried out, in which an oxidizer is introduced into the reactor cavity to form an oxide layer on the surface of the produced coating. The idle cycle is repeated every 30-50 normal cycles of chemical-thermal treatment.

EFFECT: improving the quality of the coating applied to the part by eliminating the transfer of working agent depositions from the internal reactor surfaces to the parts.

1 cl

 



 

Same patents:

FIELD: machine building.

SUBSTANCE: slurry is applied by pouring into stator inner cavity through inlet branch pipe in amount sufficient for complete immersion of guide naves in slurry. Inlet branch pipe is sealed to turn turbine stator about its axis through angle at which inlet branch pipe stays at its bottom position. Then, turbine stator is turned clockwise about axis perpendicular to its axis through angle of inclination to horizon at which slurry does not flows out of turbine stator with inlet branch pipe and guide vanes unsealed. Thereafter, turbine stator is turned about said axis counter clockwise to drain slurry. Now with slurry drained, turbine stator is rotated about its axis with turbine in horizontal position, unless slurry layer water glare disappears.

EFFECT: regular application, no surface defects.

3 cl, 1 dwg, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, particularly to chemical and thermal processing, and can be widely applied in mechanical engineering for prolongation of machine part life time. Chrome boron coating is performed in fluidised layer of powder mix. Mix contains, (wt %): boron carbide 1-30.0, chrome chloride CrCl2 0.5-10.0, aluminium fluoride 0.1-2.0, copper chloride CuCl2 0.1-3.0, corundum 55-98.3. Heating and saturation are performed in ammonia medium. Maturing is performed at 300-500C for 3-15 minutes. Saturation is performed at 600-1200C. Method allows for improvement of surface finish quality.

EFFECT: improved quality of surface finish, reduced time of processing in saturation mix.

1 tbl

FIELD: technological processes, metal working.

SUBSTANCE: invention refers to surface impregnation of steel parts, and namely to the compound used for surface laser hardening, and can be used for hardening the parts of machines and tools, which are made from construction steels and operate under conditions of multiple contact (static and dynamic) loading in machine-building industry, metalworking industry and other industries. Compound contains carbon, chrome oxide and boric anhydride at the following component ratio, wt %: carbon - 8...16; chrome oxide - 25...35; and boric anhydride - the rest.

EFFECT: improving wear-and-tear resistance of parts.

1 tbl

FIELD: metallurgy.

SUBSTANCE: nicotriding of parts is performed in mixture, containing charcoal carburiser, carbamid and Trilon-B. Nicotriding is carried out at 600-700°C with conditioning during 4-6 hours. Then contact copper coating is performed by means of holding parts in a 5-10% water solution of blue stone (CuSO4 5H2O) within 10-30 minutes. After that the parts are dried at 100-120°C during 45-60 minutes and working surfaces of parts are grinded in. In particular cases of this invention application copper coating of parts is carried out directly from the temperature of nicotriding, for example after their cooling up to 100-80°C or after their cooling up to an ambient temperature.

EFFECT: upgraded wear resistance of formed layers on working surfaces of steel friction pair parts due to improved tribological characteristics and contact strength.

4 cl, 5 dwg, 1 tbl, 3 ex

FIELD: processes providing increased wear resistance of steel articles surfaces due to changing composition and structure of their surface layers, possibly manufacture of cutting and die tools, articles operating in condition of abrasive wear, dry friction at high contact stresses.

SUBSTANCE: method comprises steps of short-duration high temperature case hardening; further diffusion saturation of steel article surfaces with carbide forming elements. Case hardening is performed at temperature 950 - 1050°C for 20 - 30 min.

EFFECT: improved wear resistance of steel articles subjected to mechanical loads at operation.

1 ex

FIELD: metallurgy; chemical-thermal treatment of articles.

SUBSTANCE: proposed method includes successive case-hardening and chromizing in fluidized layer. For case-hardening of articles use is made of mixture containing the following components, mass-%: charcoal, 5-30; water, 5-10; the remainder being corundum. Chromizing is carried out in mixture containing the following components, mass-%: metallic chromium, 0.8-12; ammonia chloride, 0.008-0.16; the remainder being corundum. In particular cases, case-hardening is carried out in solid carburizer at temperature of 900-1000°C continued for 90-240 min and chromizing is carried out at temperature of 900-950°C for 60-240 min.

EFFECT: increased saturating capacity; reduced duration of process; enhanced wear resistance and corrosion resistance of steel parts.

2 cl, 1 tbl,, 1 ex

The invention relates to the field of chemical-heat treatment of workpieces, parts and tools can be used in mechanical engineering
The invention relates to the field of chemical-heat treatment of workpieces, parts and tools can be used in mechanical engineering

The invention relates to a method of chemical-heat treatment of workpieces, parts and tool and can be used in mechanical engineering

The invention relates to metallurgy, namely the chemical-thermal treatment, and can be widely used in mechanical engineering to improve durability of machine parts

FIELD: metallurgy; chemical-thermal treatment of articles.

SUBSTANCE: proposed method includes successive case-hardening and chromizing in fluidized layer. For case-hardening of articles use is made of mixture containing the following components, mass-%: charcoal, 5-30; water, 5-10; the remainder being corundum. Chromizing is carried out in mixture containing the following components, mass-%: metallic chromium, 0.8-12; ammonia chloride, 0.008-0.16; the remainder being corundum. In particular cases, case-hardening is carried out in solid carburizer at temperature of 900-1000°C continued for 90-240 min and chromizing is carried out at temperature of 900-950°C for 60-240 min.

EFFECT: increased saturating capacity; reduced duration of process; enhanced wear resistance and corrosion resistance of steel parts.

2 cl, 1 tbl,, 1 ex

FIELD: processes providing increased wear resistance of steel articles surfaces due to changing composition and structure of their surface layers, possibly manufacture of cutting and die tools, articles operating in condition of abrasive wear, dry friction at high contact stresses.

SUBSTANCE: method comprises steps of short-duration high temperature case hardening; further diffusion saturation of steel article surfaces with carbide forming elements. Case hardening is performed at temperature 950 - 1050°C for 20 - 30 min.

EFFECT: improved wear resistance of steel articles subjected to mechanical loads at operation.

1 ex

FIELD: metallurgy.

SUBSTANCE: nicotriding of parts is performed in mixture, containing charcoal carburiser, carbamid and Trilon-B. Nicotriding is carried out at 600-700°C with conditioning during 4-6 hours. Then contact copper coating is performed by means of holding parts in a 5-10% water solution of blue stone (CuSO4 5H2O) within 10-30 minutes. After that the parts are dried at 100-120°C during 45-60 minutes and working surfaces of parts are grinded in. In particular cases of this invention application copper coating of parts is carried out directly from the temperature of nicotriding, for example after their cooling up to 100-80°C or after their cooling up to an ambient temperature.

EFFECT: upgraded wear resistance of formed layers on working surfaces of steel friction pair parts due to improved tribological characteristics and contact strength.

4 cl, 5 dwg, 1 tbl, 3 ex

FIELD: technological processes, metal working.

SUBSTANCE: invention refers to surface impregnation of steel parts, and namely to the compound used for surface laser hardening, and can be used for hardening the parts of machines and tools, which are made from construction steels and operate under conditions of multiple contact (static and dynamic) loading in machine-building industry, metalworking industry and other industries. Compound contains carbon, chrome oxide and boric anhydride at the following component ratio, wt %: carbon - 8...16; chrome oxide - 25...35; and boric anhydride - the rest.

EFFECT: improving wear-and-tear resistance of parts.

1 tbl

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, particularly to chemical and thermal processing, and can be widely applied in mechanical engineering for prolongation of machine part life time. Chrome boron coating is performed in fluidised layer of powder mix. Mix contains, (wt %): boron carbide 1-30.0, chrome chloride CrCl2 0.5-10.0, aluminium fluoride 0.1-2.0, copper chloride CuCl2 0.1-3.0, corundum 55-98.3. Heating and saturation are performed in ammonia medium. Maturing is performed at 300-500C for 3-15 minutes. Saturation is performed at 600-1200C. Method allows for improvement of surface finish quality.

EFFECT: improved quality of surface finish, reduced time of processing in saturation mix.

1 tbl

FIELD: machine building.

SUBSTANCE: slurry is applied by pouring into stator inner cavity through inlet branch pipe in amount sufficient for complete immersion of guide naves in slurry. Inlet branch pipe is sealed to turn turbine stator about its axis through angle at which inlet branch pipe stays at its bottom position. Then, turbine stator is turned clockwise about axis perpendicular to its axis through angle of inclination to horizon at which slurry does not flows out of turbine stator with inlet branch pipe and guide vanes unsealed. Thereafter, turbine stator is turned about said axis counter clockwise to drain slurry. Now with slurry drained, turbine stator is rotated about its axis with turbine in horizontal position, unless slurry layer water glare disappears.

EFFECT: regular application, no surface defects.

3 cl, 1 dwg, 1 ex

FIELD: technological processes.

SUBSTANCE: invention relates to chemical-thermal treatment of metals and can be used for hardening of parts of machines and tools in machine building, metallurgy, chemical, construction and other industries. Coating is diluted in water to paste state, and then applied on part surface. First layer of coating is applied on part surface with thickness of 0.1-0.2 mm, containing, wt%: titanium 50-75, iron is rest. Second layer of coating containing, wt%: titanium diboride 20-25, boron carbide 70-75, sodium fluoride 2-3, potassium iodide 2-3, is applied with thickness of 3-5 mm. Then, part with two-layer coating is dried in air unless solid crust, heated in heating furnace to temperature of 900-1,150 C and kept at this temperature for 0.5-4.0. Upon completion of part holding workpiece is annealed, and low-temperature tempering is performed at temperature of 180-200 C for 2 hours.

EFFECT: increased resistance and service life of steel parts and energy efficiency of hardening process.

1 cl, 1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: method of diffusion titanation of hard alloy products includes a preliminary products cementation and the subsequent diffusion saturation of their surface with titanium. After the said diffusion saturation with titanium, aging is conducted at the temperature of 300-800C for 60-120 minutes, and pre-carbonization is performed at the temperature of 1,100-1,250C for 10-20 minutes.

EFFECT: increased wear resistance and service life of hard alloy products in exposure to high contact stress, shock, and variable loads.

1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: method for protecting the internal reactor surfaces from saturation with the working medium components during the chemical-thermal treatment of parts involves the formation of a protective coating on the inner reactor surfaces, chemically neutral to the working medium. Initially, during the formation of the protective coating, from 3 to 10 nominal coating cycles are carried out on the part to produce a coating on the internal reactor surfaces from the working agent used in the chemical-thermal treatment, after which an idle cycle of the reactor operation is carried out, in which an oxidizer is introduced into the reactor cavity to form an oxide layer on the surface of the produced coating. The idle cycle is repeated every 30-50 normal cycles of chemical-thermal treatment.

EFFECT: improving the quality of the coating applied to the part by eliminating the transfer of working agent depositions from the internal reactor surfaces to the parts.

1 cl

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