Application of superflowing with application of powder flux and metal
SUBSTANCE: powder layer (14) disposed on the substrate (12) of the superalloy containing flux material and metal material is heated energy beam (16) for forming the cladding layer (10) and of a superalloy layer (18) of the slag. Give the molten bath to cool and solidify to form a slag repaired surface of the desired superalloy material. Material is fed in the form of a superalloy wire or strip into the molten bath. Filler material contains only a subset of the extrudate from the elements defining the desired superalloy material. Extruding the filler material in the form of wire or tape may be, for example, nickel, nickel-chromium alloy or nickel-chromium-cobalt.
EFFECT: improvement of the application of technology.
10 cl, 6 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to reconditioning of plain bearings. Metal powders are diffused to plain bearing bush surface to be reconditioned. Cyclic heating of the bush and bronze-base powder is performed to the powder melt temperature and powder diffusion in bush metal. Bush is held at the temperature of initial diffusion process. Then, it is cooled to the phase sintering temperatures and held thereat. Secondary cooling is performed to powder melt temperature and held thereat for build-up of reconditioned diffusion ply and said ply is cooled down.
EFFECT: accelerated and simplified thermal diffusion at reconditioning of plain bearings.
SUBSTANCE: method involves application to the treated surface of layer of the powder containing flux-forming and modifying component, hard-facing by means of scanning beam of relativistic electrons; at that, to the powder layer applied to the treated surface there additionally added is wetting agent in the form of titanium powder; as modifying agent there used is the powder consisting of tantalum or tantalum mixed with niobium, at mass thickness of powder layer σ, which is determined from the ratio σ = K·(E - b), where K = (0.2 - 0.4) [g·cm-2-MeV-1], E - energy of electrons in MeV, b = 0.21 MeV; treatment by means of scanning beam of relativistic electrons of each point of the item surface is performed during 0.5 - 2.0 s.
EFFECT: creating the coating at absence of restrictions for length and width of items; increasing the thickness of the coating to 4 mm and providing the resistance to diluted and concentrated nitrogen, sulphuric, phosphorus and chlorhydric acids.
5 cl, 3 dwg, 2 tbl, 1 ex
SUBSTANCE: coating (2) has at least one layer (3) and contains metal matrix (7) out of Ni-alloy with melting temperature lower, than material of machine element (1), with at least P as alloying component, wherein there are absorbed ceramic particles (6) of spherical shape and diameter from 40 to 160 mcm and Brinell hardness 3000. Also coating is produced by application of powder by thermal procedure.
EFFECT: reduced wear of machine parts.
18 cl, 5 dwg
SUBSTANCE: invention concerns method of operating layers receiving on surfaces of hollow barrels and can be used for bimetallic sleeves manufacturing with coating simultaneously on internal and external surfaces or only on external surface, and also for such details recovery. In detail wall there are implemented radial canals, then sintered batch is placed in its chamber. Detail is implemented lengthwise less than matrix length and installed with specified radial clearance into matrix by means of end cover with forming of end air clearances. Assembly is rotated about axis with simultaneous heating till mixture melting temperature. In covers there is implemented at least one hole connecting matrix chamber to atmosphere on radius equal to difference between external detail surface and hole. Heating is ended as only from hole it is start splash of melted metal.
EFFECT: covering refining at the expense of probable air inclusion formation in working layer of weld removal and discard is eliminated.
FIELD: cobalt-based alloy in powder-like form used for application of coats on articles subjected to erosion caused by liquids, such as steam turbine blades.
SUBSTANCE: proposed cobalt-based alloy contains the following constituents, mass-%: chromium, 28-32; tungsten, 6-8; silicon, 0.1-2; carbon, 1.2-1.7; nickel, 3-6; molybdenum, 1-3; the remainder being cobalt. Method is suitable for laser precipitation.
EFFECT: enhanced erosion resistance of cobalt-based alloy to aggressive fluids.
19 cl, 1 dwg, 1 tbl, 2 ex
FIELD: powder metallurgy; mechanical engineering; methods of production of the wear-resistant layer on the working surface of the steel detail.
SUBSTANCE: the invention is pertaining to the methods of production of the wear-resistant layer on the working surface of the steel detail by means of the powder metallurgy and may be used for production of the wear-resistant layer on the working surface of the steel details of the friction assemblies. On the mold surface fix inserts made out of the wear-resistant material having the more higher hardness - from 87 up to 91 HRA, than the hardness of the impregnated powder of the wear-resistant material. The inserts on the mold surface are fixed by means of the gluing material, in the capacity of which use the cyanoacrylate adhesive. The mold is made out of blacklead, ceramics or the metal. The details in the mold are located with the clearance of no less than 0.3 mm between the inserts -and the working surface of the steel detail with formation of the cavity. In the cavity they place the powder of the wear-resistant material and the metal- binder. Heating is conducted with provision of impregnation of the powder of the wear-resistant material with the melted metal-binder and adhesion of the surface of the inserts with the working surface of the detail. After production of the layer the mold is removed and the detail machining is conducted. The presented method allows to increase the wear resistance of the surface of the steel detail in comparison with the prototype approximately by 20 %.
EFFECT: the invention allows to increase the wear resistance of the surface of the steel detail in comparison with the prototype approximately by twenty percent.
7 cl, 4 dwg
FIELD: powder metallurgy, namely processes for applying coatings of metal powders onto article surfaces.
SUBSTANCE: method comprises steps of applying powder material onto surface of part; heating part till time moment of achieving melting temperature of powder material on butt of part surface with powder material; sintering powder material; after achieving melting temperature of powder material on butt with part surface, realizing isothermal soaking. Sintering is performed after powder material surface achieves sintering temperature that is kept constant during isothermal soaking by positive cooling of free surface of powder material. In variants of invention free surface of powder material is positively cooled by means of shield gas.
EFFECT: enhanced quality of coating, simplified technique for applying it.
2 cl, 1 ex
FIELD: mining industry and mechanical engineering.
SUBSTANCE: the invention presents a method of hardening of a hard-alloyed diamond tool. The invention is pertinent to methods of hardening of the hard-alloy diamond tools and may be used in engineering industry and mining industry. The offered method provides for deposition on the effective surfaces of the instrument of a layer of the luting containing 10-15 volumetric % of soluble silicate, used in the capacity of binding, and a powder consisting of the following ingredients (in mass %): a powder of metal of impregnation of a lower die of a fraction less than 20 microns - 56-72, a powder of aluminum oxides - 6-15, a powder of alloy of a fraction less than 50 microns - the rest. At that the layer depth of the luting makes 0.5-1.0 mm, then conduct a thermal treatment of the effective surfaces of the tool by the laser illumination with a power density of laser illumination equal to 1.103-2.105 W/cm2 and at a speed of treatment equal to 2.0-20.0 mm/s. In special cases of realization of the invention in the capacity of a metal of impregnation they use copper or a copper alloy; illumination by a laser beam is conducted in an aerosphere of a noble gas; in the capacity of noble gas they use argon. The technical result of the invention is an increased service life of the hard-alloy diamond tool at operation and a decrease of a specific consumption of diamonds.
EFFECT: the invention ensures an increase of service life of the hard-alloy diamond tool at operation and a decrease of a specific consumption of diamonds.
4 cl, 2 tbl, 1 ex
SUBSTANCE: device contains the housing with a loading window, a supply channel and a nozzle, a feeding screw with drive, and a bin. The bin is attached to the loading window of the housing and fitted with the regulator of the cross section of the loading window. The regulator is implemented as a tray fixed in the bin with a possibility of movement along the loading window. The supply channel is executed with a constant diameter along the whole length of the channel. The screw is installed in the supply channel with a gap 1-2.5 mm with reference to the channel wall. The screw is made with a variable pitch with reduction of pitch towards the furnace charge supply.
EFFECT: detail surface hardening.
4 cl, 2 dwg
SUBSTANCE: under method the size of vanadium carbide particles is reduced, and they are uniformly distributed over the volume of the austenite-martensite matrix of the hardened layer based on Fe-Cr-V-Mo-C system without pores, lack of fusion and cracks.
EFFECT: invention ensures significant reduction of the coating wear.
1 tbl, 2 dwg
SUBSTANCE: invention can be used for application of wear-resistant coatings on working surface of parts of tillers, having a shape of oblique wedge using fusion welding. The wear-resistant filler material is applied to the said surface in the form of parallel strips with a thickness of the weld layer of 2-4 mm at a right angle to the direction of displacement of the working surface of the part at a distance from each other of not more than 15 times the layer thickness. The strips are applied to the upper and lower inclined faces in the area of compressing stress of the working surface of the part with a shift from each other by the same distance in the direction of movement of the parts. The width of the weld strips on the work surface of the parts is set not more the double thickness of the weld layer.
EFFECT: invention enables to reduce the wear rate of the working surface of the parts by deformation and reduction of the density of the surface active layer of the soil in the area of the greatest intensity of friction.
2 cl, 4 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy and can be used for reconditioning of worn-out working rolls. First damaged ply is removed mechanically to heat the roll to 150-270°C. Arc deposition of wear-proof coating is performed with powder wore feed to welding area in at least three plies not over 9 mm in depth. Directly after deposition said roll is heated to 250-300°C and held thereat for at least one hour followed by cooling to not over 60°C.To get built-up ply over 9 mm in depth, powder wire is pre-deposited on roll surface to produce extra sub ply of preset depth. For deposition of extra sub ply powder wire is used that contains the following elements, wt %: 0.25-0.45 C, 0.7-1.2 Cr, 0.5-1.2 Mn, 0.15-1.2 Si, Cu<0.3, Ni<0.4, Fe making the rest. For deposition of wear-proof ply powder wire is used that contains the following elements, wt %: 0.25-0.45 C, 2.0-2.7 Cr, 0.5-1.2 Mn, 0.15-1.2 Si, 7-11 W, 0.15-0.55 V, Fe and gas- and slag-forming components making the rest.
EFFECT: higher wear resistance, longer life.
FIELD: process engineering.
SUBSTANCE: invention can be used for application of wearproof coatings on tiller working surfaces. Wearproof filler is built up on part working surface as strips with 2-4mm-deep ply at the angle to part working surface displacement path. Said strips are applied clockwise or counter clockwise in curvilinear path of loop-like cycloid shape. Distance between extreme points of built-up ply side surface at strip symmetry lengthwise axis is set equal to 1-3 sizes of built-up ply width. Angle between built-up strip symmetry lengthwise axis and working surface displacement path makes 0-90 degrees. It is possible to apply wearproof filler composed of blocks of two or three parallel strips. Adjacent strips can be shifted relative to each other along loop-like section mirror axis through half their length.
EFFECT: decreased rate of wear.
3 cl, 6 dwg
FIELD: machine building.
SUBSTANCE: wear-resistant adding material is welded up along the working surface of a part with streamline shape, the said material is presented as identical strip sections 2-4 mm thick which are parallel to each other, arranged in staggered order at the right angle to the direction of the part's working surface movement. The length of the strip sections is 5-7 times more than their width, and the distance between them amounts to not more than the width of the welded up strip, and the distance between the adjacent strips is equal to the strip width. The longitudinal symmetry axis of the central welded up strip is placed in the same plane as the symmetry axis of the working surface is, in the movement direction of the latter.
EFFECT: invention allows for the decrease of wear rate of base metal in the zone of most intense friction of the part's working surface with streamline shape by means of increasing the degree of deformation and hoeing of the near-surface active soil layer in the movement direction.
FIELD: process engineering.
SUBSTANCE: invention can be used for production of filler rods for surfacing of drill tools in contact with well walls, for example, blade drill bits. Solid alloy is ground to required grain size of hard alloy grit to be cleaned of dust and fine fragments. Brass wire is cut to lengths powder solder ingredients are mixed. Initial components are laid layer-by-layer. First thin layer of solder is filled in mould bottom, first half of hard alloy grit portion is laid and levelled. Hard alloy grit remainder is laid on solder second layer. Brass wire lengths are laid on solder third layer without allowances to fill in the fourth solder layer. Mood is placed, without mixing or displacing of components, into induction furnace and heated to fusion of brass wire lengths and solder. Mould withdrawn from furnace, produced filler rods are cooled down. Said mould is composed of graphite plate with recesses for several filler rods.
EFFECT: higher mechanical properties of the rods, higher reliability and longer life of welded parts.
9 cl, 3 dwg
SUBSTANCE: melting material for steel material acting as base metal contains the following, wt %: C from 0.2 to 1.5, Si from 0.5 to 2, Mn from 0.5 to 2, Cr from 20 to 40, Mo from 2 to 6, Ni from 0.5 to 6, V from 1 to 5 and W from 0.5 to 5, the rest is Fe and inevitable impurities.
EFFECT: weld metal is characterised by high resistance to corrosion and abrasion wear, as well as high impact hardness at room temperature.
13 cl, 11 dwg, 4 tbl, 7 ex
FIELD: process engineering.
SUBSTANCE: invention relates to hardening of parts operated under abrasive wear conditions. Dip-transfer surfacing of wearproof material with application of graphite electrode is executed. Facing material represents a cermet composite containing consolidated alloys of carbides, borides, nitrides and reinforcing ceramic superhard inclusions of boron carbide, corundum and carbocorundum. Simultaneously wit surfacing, surface being hardened is alloys with boron, nitrogen and carbon. After surfacing, the part is heated in furnace to 750…770°C and held for 1.5…2 minutes. Then, quenching and low tempering are performed at part heating to 150…160°C and holding for 8…10 minutes.
EFFECT: two- threefold increase in toughness, threefold increase in wear resistance.
FIELD: machine building.
SUBSTANCE: method of layer-by-layer wear-resistant building-up welding of steel bearing races of rotary supports of jib cranes in the medium of shielding gases includes the making of layers without preheating and after-welding heat treatment. The building-up welding is performed by stably austenitic welding materials in conditions excluding the quenching of the detail under the first layer. After building-up welding of the first layer and its curing the building-up welding of the second and consequent layers with chrome-manganese materials in conditions excluding the mixing and through penetration of the first layer, and also quenching of built-up detail. The first layer is made at a forward speed 2-5 m/h with stably austenitic welding materials of the type Sv-Kh15N25AM6 or welding rods EA-395/9, NIAT-5, ANZhR-1, ANZhR-2 and EA-48/N22. The second and consequent layers are made at a speed 18-25 m/h with austenitic chrome-manganese materials of the type Sv-Kh18N7G7 or welding rods TsNIIN-4.
EFFECT: excluding possibility of formation of hardening patterns in quenched steel, which result to cooling cracks under the building-up welding.
2 cl, 3 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to production of assembly obtained by connection of first structural element (1) with second structural element. First structural component (1) is configured by making of the set of long ledges (3) on its connection surface (2). Every ledge (3) has axial line, end and base. Axial line at the end of every ledge (3) is directed at the angle to perpendicular to connection surface (2) nearby the ledge base while angular orientation of axial lines extending through said ends varies with said set of ledges (3). Then, first structural element and multiple setting elastic laminate plies are bonded to input ledges (3) in at least several setting elastic laminate plies to solidify said plies to get second structural component.
EFFECT: higher hardness of the assembly of structural elements.
13 cl, 5 dwg