The way to restore damaged surfaces of metal products

 

(57) Abstract:

Usage: the invention relates to methods of producing metal coatings on the surface of various products of thermal methods in particular by plasma spraying. The inventive metal part is subjected to vibrations with frequencies over 100 Hz and an amplitude of 0.01 to 0.04 mm in the direction coinciding with the direction of plasma flow. The coating is carried out in several layers, the first of which are layers of metals such as Cu, Ni, Cr and /or their alloys. Before plasma spraying the surface details make the roughness of the order of 18 to 20 μm and is subjected to heating to 160 - 180C. 1 C. p. F.-ly, 3 ill.

The invention relates to methods of applying metal coatings on the surface of various products thermal method, in particular by plasma spraying.

There is a method of spraying a protective coating on the surface of articles, such as pistons. In this way the surface is cleaned from dirt, creating a mechanically microscopic irregularities to increase the area of adhesion, heat the surface up to 200-210aboutWith and then sprayed aluminum sublayer, over which is applied a layer OS is charging voltages, preventing the formation of cracks in the main layer. The disadvantages of this method is the low adhesion of the applied layer, and a significant probability of uneven thickness of the coating.

There is also known a method of producing metal coatings on various parts by spraying metal powder on the coated surface. In this method, the product is heated to the melting temperature of the powder and the coating process of the product and the powder, add the translational-rotational movement. The result is a uniform coating layer, however, the adhesion strength remains low due to the presence of residual stresses in the deposited layer, in addition, the strength of the actual coverage is also low.

The aim of the invention is to remedy these disadvantages, namely the proposal together successive manufacturing operations, ensuring the application of a durable coating with high adhesion strength.

The objective is achieved by performing the conditions that promote maximum adhesion material layer with the surface of the product, as well as to minimize the level of ostatok techniques, as obtaining the required surface roughness of the product and its temperature, and especially the changing nature of the relative movement of coating material and products, namely fluctuations products with a certain frequency and amplitude in the direction coinciding with the direction of flow of coating material. The range of surface roughness provides the optimal ratio of the surface area of the product that interacts with the flow of coating material and its adhesion, and heat the surface of the product within the specified range can improve the adhesion process without distortion of the original geometric parameters of the product, which is typical for processes with melting substances. Introduction fluctuations of the product allows you to remove the residual stresses that are inevitable for coatings obtained by plasma spraying, as well as to increase the mechanical strength of the coating, because of the emerging movement in the opposite direction of the product and the particle flux phenomenon of work hardening in the deposited layer.

In Fig. 1 schematically shows a device for coating the surface of the product; Fig. 2 - the results of stress tests products, treated with different frequency driver and with different amplitude From the surface B in Fig. 1.

The proposed method is implemented as follows.

Before beginning the process damaged the surface prepare, closing up the porosity and sinks, as recommended, for example, in the technical guidance materials "sliding Guides (RTM-2 H20-12-79)" published by ANIM, Moscow, 1981, page 17, damn. 2.

Then make a shot blasting the surface, according to the manufacturing process. This operation is carried out until obtaining the roughness of the recovered surface within 18-20 microns. A series of tests set this interval, which is explained in the following. By reducing the height of the asperities, the decrease of the adhesion of the sprayed layer due to small parts that interact with the flow of the applied substances. On the contrary, in case of exceeding beyond the specified interval roughness, adhesion decreases due to the increasing non-uniformity of the conditions of deposition of the particles of coating metal on the microscopic irregularities restored (the particles of deposited substances interact mainly with the tops of the asperities).

Next, the prepared surface is heated to 160-180aboutWith that being the deposits limit the beginning of the process of chemical oxidation of the material recovered surface, as well as the resulting thermal stresses that reduce adhesion.

Directly after heating to produce layer-by-layer plasma spraying. As the first of the applied layers use metals such as Cu, Ni or Cr. During deposition of the recovered surface is reported reciprocating movement (oscillations) in the direction coinciding with the direction of movement of the plasma. Movements take place in the resonant mode with the following parameters: frequency above 100 Hz and an amplitude of 0.01 to 0.05 mm In the fluctuations appear counter-flow of the plasma and the surface of the product, which reduces work hardening in the deposited layer, increase durability and promote uniformity of the coating, and in addition, to improve ductility and toughness. Similarly cause the subsequent layers of the primary coating.

This method can be implemented by the device shown in Fig. 1.

Pre-treated by sandblasting equipment product 1 is heated and placed onto a work surface And table 2, which is mounted in guides 3.

Then the product down the head of the torch 4 (this mo", 1958 , pages 14-25) and serves the voltage on the coil 5 of the actuator, which acts on table 2, through core 7 and the compression spring 6. In the result of table 2 makes oscillatory movement in the guide rails 3 through the flow axis 8 of the head 4 of the plasma torch. Then include the torch and move it along the surface "B" of the processed product.

A series of tests it is established that at the oscillation frequency above 100 Hz adhesion with the base metal practically unchanged (Fig. 2), reaching at the specified frequency doubling, compared with a fixed product.

It was also found that with increasing amplitude (Fig. 3) the increase of adhesion, which is explained by the increase in energy intensity relative displacements products and plasma flow, however, limits the amplitude determined by the strength characteristics of the product and of the device for implementing the method. The analysis of such devices shows that current mechanisms, the optimal value of the amplitude is in the range of 0.03 to 0.04 mm

Applied as a first layer of non-ferrous metals (Cu, Ni or Cr or their alloys) allow to increase the adhesion of the layers of the base metal, preventing the surface is OYA, what is especially important, for example, in the restoration of monuments or their decorative treatment. (56) USSR Author's certificate N 306198, class C 23 C 4/12, 1971.

1. The WAY to RESTORE DAMAGED surfaces of METAL PRODUCTS, including heating of the surface and subsequent plasma spraying while moving the product, characterized in that the surface previously subjected to blasting treatment to a surface roughness in the range of 18 to 20 microns, heating the surface of the lead up to 160 - 180oWith that move the product oscillating in the direction of motion of the plasma, and sputtering is conducted in layers, and as the first layer using copper, Nickel or chromium or their alloys non-ferrous metals.

2. The method according to p. 1, characterized in that the vibrational movement of the products is carried out with a frequency higher than 100 Hz and an amplitude of 0.03 to 0.04 mm.

 

Same patents:

FIELD: forming inter-metallic layer on metal part, especially on parts of jet engine at air flow over it.

SUBSTANCE: proposed method includes application of modifier on at least one selected section of metal part surface. Then metal part is placed in sedimentation medium and donor material acts on selected section of part surface during period of time sufficient for forming inter-metallic layer containing metal obtained from donor material. Modifier forms inter-metallic layer on this modified section of surface. Thickness of inter-metallic layer exceeds thickness of inter-metallic layer formed on said section of surface subjected to action of donor material in sedimentation medium without modifier applied on it preliminarily. Modifier is selected from group consisting of metal halogen Lewis acid, silane material and colloid silicon oxide.

EFFECT: facilitated procedure of forming inter-metallic layer of required thickness.

41 cl, 13 dwg

FIELD: engines and pumps.

SUBSTANCE: invention is related to turbine blade with coating for deterrence of Ni-based superalloy reactivity. Specified coating is made by application of material for reactivity deterrence on Ni-based superalloy surface prior to application of diffusion aluminium coating. Material for reactivity deterrence represents pure Ru, alloy Co-Ru, alloy Cr-Ru or solid solution, the main component of which is Ru, at that creation of secondary reaction zones is deterred. Turbine blades are produced with higher resistance to Ni-based superalloy oxidation by deterrence of secondary reaction zones creation.

EFFECT: higher resistance to Ni-based superalloy oxidation.

7 cl, 4 tbl, 13 dwg, 2 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to method of applIication coating for inhibition of reactivity of super-alloy on nickel base. A material inhibiting reactivity is applied on the surface of super-alloy on Ni base prior to application of diffusive aluminium coating. The material inhibiting reactivity corresponds to pure Ru, alloy of Co-Ru, alloy of Cr-Ru or solid solution, the basic component of which is Ru, also formation of the secondary zones is retarded.

EFFECT: production of coating for inhibition of reactivity of super-alloy on nickel base at retarding formation of the secondary reaction zone.

7 cl, 19 dwg, 4 tbl

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular to methods of the chemical heat treatment of metals and alloys, and can be used in mechanical engineering for surface hardening of parts of machines, including the parts used in friction pairs, and also in cutting tools and die tooling. The method of the chemical heat treatment of a part from alloyed steel includes the placement of the part into the working chamber, activation of the part surface before chemical heat treatment, supply into the chamber of a working saturating medium, heating of the part to the temperature of chemical heat treatment and conditioning at this temperature until the formation of the required thickness of the diffusive layer. Activation of part surface before chemical heat treatment is performed by means of ion-implanted processing of the surface of the part at the energy of ions from 25 to 30 keV, radiation dose from 1.6·1017 cm-2 to 2·1017 cm-2, radiation dose set speeds from 0.7·1015 s-1 up to 1·1015 s-1 and when using as implanted ions of the following elements: C, N or their combinations. In special cases of the invention implementation the chemical heat treatment of the part is performed by a ion-plasma method. The ion-plasma method is the ion-plasma nitriding, either ion-plasma cementation, or ion-plasma nitrocementation.

EFFECT: increase of productivity and improvement of the quality of the process of chemical heat treatment, and also increase of the wear resistance of the parts after it.

3 cl, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly to methods for chemical-thermal treatment of parts made from titanium, and can be used in mechanical engineering for surface strengthening of parts of machines, including parts operating in friction pairs. Method for chemical heat treatment of parts made from titanium involves placing a part in a working chamber, activation of surface of part before chemical-thermal treatment, feeding into chamber a working saturating medium, heating part to temperature of chemical-thermal treatment and holding at said temperatures to form required thickness of diffusion layer. Activation of surface of part before chemical-thermal treatment is carried out by means of ion-implantation treatment of surface of part at ion energy from 30 to 40 keV, dose from 1.4·1017 cm-2 to 1.8·1017 cm-2, at a dose accumulation rate of 0.7·1015 s-1 up to 1·1015 s-1 and implanted ions used are ions of C, N or their combination. In particular embodiments of invention, chemical-thermal treatment of parts is performed by ion-plasma nitriding, or ion-plasma cementation, or ion-plasma nitro-carbonisation.

EFFECT: higher efficiency and quality of chemical heat treatment, higher wear resistance of parts after chemical-thermal treatment.

3 cl

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly to methods of chemical and heat treatment of parts from titanium-based alloy, and can be used in mechanical engineering for machines parts surface strengthening, including parts, operating in friction pairs. Method for chemical heat treatment of parts made from titanium-based alloy comprises placing part in working chamber, activation of surface of part before chemical heat treatment, feed a working saturating medium into chamber, heating to temperature of chemical heat treatment and holding at said temperatures to form required thickness of diffusion layer. Activation of surface of part before chemical heat treatment is carried out by means of ion-implantation treatment of surface of part at ion power from 30 to 40 Kev, with dose from 1.4⋅1017 cm-2 to 1.8⋅1017 cm-2, at dose build-up rate of 0.7⋅1015 s-1 up to 1⋅1015 s-1, wherein implanted ions are ions of following elements: C, N, or combinations thereof. In particular cases, chemical heat treatment of part is performed by ion-plasma nitriding or ion-plasma cementation or ion-plasma carbonitriding.

EFFECT: higher efficiency and quality of chemical heat treatment, higher wear resistance of parts after chemical-thermal treatment.

3 cl, 1 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

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: 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 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: 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.

FIELD: metallurgy.

SUBSTANCE: invention refers to methods of treatment of planing machine rollers. The method includes preparing of roller body surface and application of strengthening coating. Preliminary preparation of roller body surface is performed by means of its blowing-off under pressure with iron shot of 180...200 mcm fraction. Further two-layer strengthening coating is applied by the method of gas-detonation sputtering. Also the interior layer of coating is applied with powder of tungsten carbide of 55...65 mcm fraction obtaining thickness of the interior layer of 15...25 mcm. The exterior layer is applied with copper powder with additives not more, than 0.6%, obtaining the thickness of the exterior layer of 8...10 mcm.

EFFECT: upgraded wear resistance of sheet planing roller.

1 ex

FIELD: technological processes, metal working.

SUBSTANCE: invention is related to the field of metal products cleaning, such as rolled wire, wire, strip, forged pieces, foundry and others, in particular, to method for electroarc processing of metal products surfaces and may find application in different branches of machine building industry. Prior to arc discharge treatment, surface is previously coated by thin layer of alkaline, alkali-earth or rare-earth metals or their compounds in process of hot processing or in cold condition. Prior to processing, at atmospheric pressure processed surface is previously coated by material, which is gasified by cathode spots of arc, creating protective or restorative medium above cleaned surface. Result achieved is considerable reduction of metal products processing cost, higher efficiency of processing and lower heating of processed product metal.

EFFECT: reduction of metal products processing cost, higher efficiency of processing and lower heating of processed product metal.

2 cl, 1 tbl

FIELD: textile fabrics; paper.

SUBSTANCE: invention relates to recovery method of diametric dimension of drier of paper-making equipment. After turning cut of cylinder it is implemented thermal processing of surface at temperature 100°C in passage area of electroarc burner. Then one-pass by material M470 it is applied the first adhesion layer of coating of solidity 360-420 HB of thickness 0.1 mm. It is applied the second filling layer by material ST-0002 of solidity 360-420 HB, thickness of which corresponds specified value of increase of diametrical dimension. It is applied the third coating cover of thickness 0.5 mm by material ST-0028 of solidity 250-270 HB, subject to allowance 1-2 mm for complete machining. Application is impregnated by compound "Hartz" in cooled condition, grind and polished the surface by flexible tool with providing of roughness Ra<0.63 micrometre, it is washed workpiece surface by mineral oil. After what it is run in surface of cylinder by edge scraping tool with angle of wedge slope 25°-30° and linear pressure 200-300 N/m.

EFFECT: it can be used in mechanical engineering at repair of driers without removal of it from the operation position.

FIELD: textile fabrics, paper.

SUBSTANCE: invention relates to paper-making manufacturing, particularly to application method of corrosion protection coating on working surface of rolling and creping cylinders and can be used at repair of rolling and creping cylinders without its taking off from operation position. After turning cut and thermal processing of surface one-pass it is applied the first adhesion layer of thickness 0.1 mm by iron alloy with chrome content 10÷13%. Then it is applied the second coating cover of thickness 2.0÷2.2 mm with content 13% of chrome and 27% of nickel. Then is implemented impregnation of coating cover by anticorrosive composition and grinding of operating surface by flexible tool.

EFFECT: receiving of cylinder with high processing characteristics, there are reduced expenditures for equipment repair and it is improved quality of paper, received with usage of mentioned cylinders.

FIELD: technological processes, metal working.

SUBSTANCE: invention is related to methods for preparation of flat steel cutting tools for operation, namely, to strengthening of cutting edges of disk scissors knives. Method includes preliminary processing of cutting edges by means of their blowing with coarse-grained abrasive and application of wear-resistant coat in them with thickness of 10…25 mcm. Coat is applied by means of gas detonation spraying of powdery mixture of chrome carbides on nickel binder with fraction of 55…60 mcm with pressure of 2900…3200 MPa during explosion of propane and oxygen mixture.

EFFECT: higher efficiency of cutting tool.

3 cl, 1 ex

Up!