Method of surface preparation for plasma sputtering of coatings

FIELD: technological process.

SUBSTANCE: invention is related to methods of surface preparation for plasma sputtering of coatings and may be used for cleaning of different surfaces with abrasive materials. Method includes abrasive treatment of surface that is subject to sputtering with thermal abrasive jet directed at the angle of 40...45° to processed surface. Jet is formed from high-temperature gas flow with abrasive loose material with fraction size of 0.3 - 0.7 mm. Processing is carried out until surface roughness is 40-50 micrometer, at that the mentioned surface is heated with high-temperature flow of gases up to 70 - 210°C.

EFFECT: provision of high-quality adhesion of coating with surface subject to sputtering.

 

The invention relates to a method which is suitable for cleaning various surfaces with abrasive materials, and can be used for surface preparation for plasma spray coatings.

The known method of surface preparation for plasma spray coatings, including abrasive processing the surface to be coated (EN 2087583 C1, B24C 1/10, 20.08.1997).

The disadvantage of this method of surface preparation with the purpose of its preparation for further plasma spray coatings is that it does not provide the required surface roughness.

The basis of the invention is tasked to provide the specified surface roughness by its processing abrasive material specific factionalism with simultaneous heating the surface to a temperature which will ensure good adhesion of the sprayed coating to the surface on which it is applied, while providing the optimal angle surface treatment thermal abrasive stream.

The problem is solved in that in the method of surface preparation for plasma spray coatings abrasive surface, to be plated, conduct directed at an angle of 40...45° the workpiece surface thermal abrasive jet formed from Vysokoe the temperature of the gas stream with abrasive material from 0,3 to 0,7 mm, to obtain a surface roughness of 40...50 microns, while the said surface is heated by the high temperature gas flow to 70...210°C.

Because surface preparation for plasma spray coatings conduct directed at an angle of 40...45° the workpiece surface thermal abrasive jet formed from high-temperature gas stream with abrasive material from 0,3 to 0,7 mm, to obtain a surface roughness of 40...50 microns, while the said surface is heated by the high temperature gas flow to 70...210°provides specified surface roughness by its processing abrasive material specific factionalism with simultaneous heating the surface to a temperature which will ensure good adhesion of the sprayed coating to the surface on which it is applied, and the optimal the angle of surface treatment thermal abrasive stream.

The proposed method of surface preparation for plasma spray coatings is as follows.

Form a high flow of gases and solid particles of abrasive material. This flow of gases with particles of abrasive material is directed at an angle of 40...45° to the surface, for example, working bodies of building and road machines, such as the teeth of the rippers, the knife is bulldozers, blade mixers, subject to further plasma spray coatings. The surface on which will be produced plasma spraying, high-temperature heat with the gas stream to a temperature of 70...210°. Simultaneously with the heating surface to produce a surface processing abrasive material by factionalism 0,3 to 0,7 mm Surface is treated abrasive material to achieve its roughness 40...50 microns. When exposed on the surface of the parts abrasive granular material is cleaned, provided the specified roughness, and when the shock of the bulk material specific factionalism on the surface prepared for plasma spray coatings, it is microdeformation by microglobuline particles of the bulk material.

The range of surface temperature, factionalism abrasive granular material, the angle of impact of thermal abrasive jet on the surface are selected depending on the material of the workpiece surface, which will be produced plasma spraying, and the surface roughness is determined depending on the type of coating this surface in the plasma spraying process. The suggested temperature ranges, factionalism abrasive granular material, the angle of surface treatment tervarus the main jet and the surface roughness after processing were defined experimental way.

As a high-temperature gas flow can be used the following combination of gases: nitrogen, carbon dioxide, oxygen in different percentages depending on the workpiece material.

The surface preparation method for plasma spray coatings, including abrasive processing the surface to be coated, wherein the treatment is carried out aimed at an angle of 40...45° the workpiece surface thermal abrasive jet formed from high-temperature gas stream with abrasive material by factionalism 0.3-0.7 mm, to obtain a surface roughness of 40-50 microns, while the said surface is heated by the high temperature gas flow to the 70-210°C.



 

Same patents:

FIELD: metallurgy industry; mechanical engineering; other industries; methods of the vacuum-arc treatment of the metal products.

SUBSTANCE: the invention is pertaining to the field of the vacuum-arc treatment of the metal products before deposition on them of the coatings and may be used in metallurgy industry, mechanical engineering and other industries. The method provides for the vacuum-arc refining of the product-cathode and deposition of the coatings. Before deposition of the coatings the vacuum-arc refining is combined with the simultaneous complete or local oxidation of the surfaces, for example, up to the yellow, blue, violet, brown, black colors and-or tints and the combinations of the colors and tints. During the treatment of the long-sized products the local oxidation can be conducted in the form of the longitudinal and-or transversal straps and areas. The mode of the oxidation is exercised due to vibrations of the arc or the arcs, and-or due to for example the change - the increase of the power of the arc and-or the power emitted by the product caused by the electric current passing through it in the section from the electric current feeder from the power supply or the power supplies feeding the arc or the arcs to the product-cathode up to the electric arc or the arcs. The technical result of the invention is expansion of the technological capabilities of the method of the vacuum-arc treatment, improvement of the quality and the extension of the assortment of the depositing coatings.

EFFECT: the invention ensures expansion of the technological capabilities of the method of the vacuum-arc treatment, improvement of the quality and the extension of the assortment of the depositing coatings.

3 dwg

FIELD: chemical industry; other industries; deposition of coatings by the gas-thermal methods.

SUBSTANCE: the invention is pertaining to the field of deposition of coatings by the gas-thermal methods, in particular, to the plasma deposition. The invention presents the method of preparation of the surface before the plasma deposition of chromium carbonyl. The method includes realization of the electrospark doping in the carbonic gas medium with utilization of the electrode formed from the powder on the basis of chromium. The doping is conducted at the following modes: the specific duration of the doping is 2-3 minutes/cm2, the discharge current - 0.6-0.9 A, the amplitude of the electrode vibrations is 60-70 microns, the frequency of the electrode vibrations is IOO Hz. The technical result of the invention is the increase of the cohesion strength of the gas-thermal coating with the substrate.

EFFECT: the invention ensures the increased cohesion strength of the gas-thermal coating with the substrate.

1 ex

FIELD: metallurgy; restoration of working surface of crystallizer walls without disassembly of it.

SUBSTANCE: method of restoration of crystallizer walls made from copper and its alloys includes making notch, 0.5 mm deep at depth of wear of working surface no less than 1.0 mm. Then, working surface at depth of wear no less than 0.5 mm is subjected to shot-blasting after which precoat of thermo-reactive material, 0.1-0.2 mm thick and working layer of wear-resistant material are applied by gas thermal spraying. Depth of residual wear is no less than 0.5 mm.

EFFECT: enhanced resistance of coat.

2 ex

FIELD: oil-producing industry; mining; boring equipment.

SUBSTANCE: the invention is pertaining to the field of boring equipment and may be used at building-up of boreholes in the deep and superdeep drilling, and also at the open-cut mines at the blastholes drilling with blasting of the mine face by air. The method provides for the milling machining of each cog and deposition on it of an abrasive resistant protective coating. Before milling machining it is necessary to exercise turning machining of the inner and outer surfaces of the rolling cutter. After milling machining deposit an anticementing coating on the surfaces requiring protection against cementation. Then exercise cementation of the rolling cutter, its subsequent tempering in the oil, the low tempering, the bearing tracks grinding and coating by vapor deposition of an abrasive resistant protective coating on the cutter teeth and its intercrowned pits of the milling cutter. The protective coating has the hardness in the interval from HRC64 up to HRA72. Deposition of the protective coating is exercised, when the limiting temperature of heating-up of the rolling cutter does not exceed the temperatureof tn=280°C, at which the loss of strength of the cemented surfaces starts. The abrasive resistant protective coating is deposited in one or several layers till reaching the preset project depth of 0.2-0.8 mm. The technical result of the invention is the increased reliability of protection of the surfaces of the milled reinforced items against the wear and the increased mechanical resistance of the drilling bit as a whole.

EFFECT: the invention ensures increased reliability of protection of the surfaces of the milled reinforced items against the wear and the increased mechanical resistance of the drilling bit as a whole.

3 cl, 1 dwg

The invention relates to mechanical engineering and can be used for the application of thermal spray coatings with high values of adhesion and cohesion

The invention relates to the field of application of metallic adhesion layer for thermally sprayed ceramic thermal insulation layer on the metal structural parts

The invention relates to mechanical engineering and can be used for coating various purposes on the working surfaces of parts
The invention relates to methods for coating and repairing worn surfaces of the parts, working in pairs, friction, and can be used in various branches of national economy

The invention relates to the fabrication of titanium alloys and can be used in forging and sheet metal stamping and heat treatment of titanium alloys
The invention relates to the coating of thermal methods

FIELD: mechanical engineering.

SUBSTANCE: method comprises affecting the flow of abrasion suspension with a jet of compressed air with a velocity of more than 200 m/s to form aerosol particles for supplying abrasion jet to the surface to be worked from the nozzle. The mass flow rates of the abrasion suspension relates to that of compressed gas as no more than 1:2. The jet pulsates, and time interval for which the jet does not affect the surface to be worked is 0.1-1.0 of time interval for which abrasion jet affects the surface.

EFFECT: enhanced efficiency of working.

1 dwg

FIELD: fluidic treatment processes, possibly removal of surface layer and(or) sealing and(or) applying coating on solid surfaces.

SUBSTANCE: method is realized due to batch adding of agent for fluidic treatment into transporting air flow created at reduced pressure and delivering said agent through hose system to fluidic nozzle for directing onto treated surface. Said fluidic nozzle forms at least one additional injector for generating and supplying additional energy impulse by means of one additional gas flow sucked by action of reduced pressure and subjected at least to atmospheric pressure action.

EFFECT: increased rate of fluidic treatment, possibility for controlling quantity of energy transferred through agent for fluidic treatment to treated surface depending upon field of usage, shape of treated surface, parameters of fluidic treatment.

30 cl, 7 dwg, 5 ex

FIELD: mechanic working of metals, namely abrasive-jet finishing, mainly of precision friction pairs.

SUBSTANCE: method comprises steps of working fixed sample by acting upon it with compressed air stream containing abrasive particles; measuring in fixed sample sizes of non-worked spots in static imprint of air-abrasive jet having axial percentage density of lubricant micro-recesses equal to 0.45; acting upon part surface with air-abrasive jet for shaping lubricant micro-recesses. Contour of air-abrasive jet is to be inside circle with radius r = 0.74R where R - radius of static imprint of air-abrasive jet on working plane. Working is realized while providing part oscillations with frequency 20 - 30Hz and with amplitude equal to half of specified dimension of non-worked spots in zone of static imprint of air-abrasive jet on fixed sample. Percentage density of lubricant micro-recesses is in range 0.45 - 0.25.

EFFECT: uniform distribution of lubricant micro-recesses.

2 dwg, 1 ex

FIELD: mechanic working of metals, namely finish abrasive jet working, mainly of precision friction pairs.

SUBSTANCE: method comprises steps of acting upon surface of part with stream of compressed air containing abrasive particles and creating lubricant micro-recesses on worked surface. Lubricant micro-recesses are formed with depth equal to λmax = 1.34 hmax, where hmax - maximum depth of friction surface wear at satisfying relation Flubr/Ffr = 0,45 where Flubr - total area of lubricant micro-recesses, Ffr - friction surface area.

EFFECT: reduced wear degree of friction surfaces of parts.

2 dwg, 1 ex

FIELD: monitoring of processes of abrasive jet treatment of part surfaces, possibly in machine engineering at applying lubricant in micro-recesses of predetermined depth.

SUBSTANCE: method comprises steps of determining speed of abrasive particle striking upon surface of driven to rotation and then fixed reference sample for further measuring depth of craters. Reference sample is made of the same material with the same hardness as treated part. Reference sample is driven to rotation and abrasive is fed to zone of sample rotation from pneumatic nozzle mounted normally relative to rotation plane. Depth of craters is measured at linear velocity Vo of rotation on radius of abrasive particle striking spot with use of given formula (1). Fixed sample is subjected to abrasive jet treatment with the same abrasive particles. Depth of craters is measured again and striking speed V1 is determined with use of formula (2). Then part is subjected to abrasive jet treatment. Pressure P3 at inlet of abrasive jet nozzle is determined with use of formula (3) for providing predetermined depth of craters.

EFFECT: possibility for providing predetermined depth of lubricant micro-recesses.

2 dwg, 1 ex

FIELD: processes and equipment for cleaning, possibly hard-to-reach surfaces of articles, mainly of complex-shape articles subjected to hardening by micro-arc oxidizing.

SUBSTANCE: method comprises steps of using working agent moved by means of impeller mounted in housing secured to shaft mounted through joint assembly on drive unit. Guiding housing is in the form of enlarged cone with apex angle 45-70° and with holes on its whole surface consisting 25-30% of cone surface passing to cylindrical one and then to narrowing cone with apex angle 10-15°. Pulp in the form of water solution containing 20-30% of abrasive particles is used as working agent. The last is moved by two stages while using at first stage abrasive particles with size 60 - 200 micrometers and at second stage using abrasive particles with size 30-60 micrometers.

EFFECT: enhanced quality of cleaning, increased useful life period of articles.

4 cl, 3 dwg

FIELD: processes and equipment for cleaning, possibly hard-to-reach surfaces of articles, mainly of complex-shape articles subjected to hardening by micro-arc oxidizing.

SUBSTANCE: method comprises steps of using working agent moved by means of impeller mounted in housing secured to shaft mounted through joint assembly on drive unit. Guiding housing is in the form of enlarged cone with apex angle 45-70° and with holes on its whole surface consisting 25-30% of cone surface passing to cylindrical one and then to narrowing cone with apex angle 10-15°. Pulp in the form of water solution containing 20-30% of abrasive particles is used as working agent. The last is moved by two stages while using at first stage abrasive particles with size 60 - 200 micrometers and at second stage using abrasive particles with size 30-60 micrometers.

EFFECT: enhanced quality of cleaning, increased useful life period of articles.

4 cl, 3 dwg

FIELD: mechanical engineering.

SUBSTANCE: method comprises wetting the conducting granules of fluid with weak-conductive liquid and applying voltage. The value of the voltage should be higher than that required for the onset of current in the fluid-blank circuit and lower than that of the beginning of shorts in the circuit. The weak-conductive fluid is made of industrial water.

EFFECT: improved cleaning.

1 cl, 1 dwg, 1 ex

FIELD: finishing operations, mainly of precision parts.

SUBSTANCE: method comprise steps of mechanically working surface of rotating part with annular slits respective to pitch of micro-relief; realizing working when mask is put on worked part with use of abrasive-jet process; after removing mask, lapping part in order to remove swellings of metal.

EFFECT: improved wear resistance of part, enhanced efficiency of process.

2 dwg

FIELD: mechanical engineering and atomic power engineering.

SUBSTANCE: composition for surface cleaning from operational or technological contaminants and for deactivating radioactively contaminated surfaces includes solid particulate material with density of 1.5 - 5.0 g/cm3 and native mineral of clay material with clay ion-exchange mass of hydromica, montmorillonite and kaolin type. Solid particulate material is aluminum oxide, silicon dioxide, calcium oxide or mixture thereof. Mineral plasticity is not more than 7 at a given ratio of solid particle dimensions.

EFFECT: increased efficiency.

1 dwg, 4 tbl

FIELD: mechanical engineering.

SUBSTANCE: method comprises scanning surface during working with variable rate. The step of scanning depends on the value of jet trace which is determined at any point of the surface on the basis of the analytical description of the surface topography before working.

EFFECT: improved working of complex-shaped surfaces.

5 dwg

Up!