Method for treating surface of zirconium alloy plate

FIELD: metallurgy.

SUBSTANCE: method for treating zirconium alloy plate surface includes application of magnesium oxide powder onto the plate surface and laser treatment, which is carried out in 1-10 passes at average laser radiation power of 10-60 W, pulse frequency of 20-100 kHz, laser beam scanning rate of 100-1000 mm/sec. Then annealing is carried out in muffle furnace at 700-1100°C for 5-25 minutes.

EFFECT: formation of transparent oxide film of mixed composition with high hardness, adhesion strength and corrosion resistance.

9 dwg, 1 tbl

 



 

Same patents:

FIELD: metallurgy.

SUBSTANCE: invention relates to powder metallurgy, in particular to the methods of production of high porous cellular materials (HPCM) intended for use as filters, acoustic absorbers, catalyst carriers, heat exchange systems, structural materials working under high temperatures, and can be used in power engineering, machine building, chemical and other industries. The method includes preparation of suspension of the mixture of powders based on chromal, the suspension application to the porous polymer material, the organic substances removal by heating with production of the blank, the blank sintering, at that on the blank after its sintering the chrome oxide Cr2O3 is applied, and secured in volume and on surface of the blank cell by sintering.

EFFECT: increased catalytic reactivity and durability of the material.

4 cl, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to a method of electroblasting sputtering on a friction surface of composite coatings of the TiB2-Mo system. A powder charge of titanium diboride is arranged between two layers of a molybdenum foil. A pulse multiphase plasma jet is formed by electric blasting of the foil and it is used for the fusion of the friction surface at the specific energy flow value of 3.5…4.5 GW/m2. Plasma jet components are sputtered onto the fused layer with further self-hardening and formation of a composite coating containing titanium diboride and molybdenum.

EFFECT: obtaining a coating having high wear resistance and micro hardness and high adhesion of the coating to the base.

2 dwg, 3 ex

FIELD: machine building.

SUBSTANCE: spattering is performed by high-speed gas-flame method with the torch movement speed relatively to the treated surface 0.5÷1.0 m/s. Applied powder contains amorphous phase. Spattering is performed with surface temperature keeping at level 90±10°C by creation of the additional shielding gas flow in the spattering zone. In each layer the torch is moved with step h. In each next layer the torch is shifted by distance s relatively to the previous layer such that h=1.8s÷2.2s.

EFFECT: increased service life of the protecting coating due to its increased corrosion resistance.

3 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to making of amorphous covering film (versions). Film is produced by release of flame including particles of material for deposition by flame deposition gun towards substrate material. Said flame melts said particles while both flame and particles are cooled by cooling gas before said particles reach the substrate material. This device comprises tubular element arranged in the path of ejected flame to surround the latter extending through the particles fusion zone. Tubular element has flow section for cooling gas made there along and integral therewith.

EFFECT: possibility of using multiple metals of high melting point and barrow band of overcooling temperatures, suppression of the release of oxides.

7 cl, 12 dwg, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a method of applying a coating composition containing carbon in form of carbon nanotubes, graphenes, fullerenes or mixtures thereof and metal particles on a substrate, followed by treatment under pressure and heat treatment of the coating after application on the substrate. The invention also relates to a substrate obtained using the disclosed method and use thereof as an electrochemical structural element.

EFFECT: invention provides low mechanical wear, low frictional coefficient and good electrical conductivity of the coating.

30 cl, 2 ex, 4 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to metal surface processing. Method of obtaining corrosion-stable covering on the surface of non-alloy steel includes preparation of powder in form of nanocomposite particles of Fe-Ni, which contain 3-10 wt % of nickel, and its layer-by-layer application on surface of non-alloy steel with laser sintering. Layer-by-layer application of coating on is carried out with formation of sintered coating up to 0.8 mcm thick, which consists of iron particles in nickel envelope with size 20-40 nm. Laser sintering is carried out by irradiation with wave length 1-1.1 mcm, impulse generation frequency 20-100 kHz, power 8-60 Wt and scanning rate 30-500 mm/s.

EFFECT: increase of corrosion stability of steel is ensured.

2 dwg, 2 tbl, 1 ex

FIELD: nanotechnology.

SUBSTANCE: invention relates to nanoelectronics and nanoelectromechanics and can be used in various fields of modern nanoindustry, microelectronics, alternative energetics, etc. In the method of production of the nanostructured coating of granular nanocomposite "metal-ceramic" the nanocomposite is preferably prepared by the method of ion-beam sputtering to form granules with an average diameter of preferably 2-4 nm, and the concentration of the metallic phase in the resulting nanocomposite while spraying is provided in the range of 25-30 atm.%.

EFFECT: invention provides creation of the nanostructured coating that provides increased wear resistance, high dimensional stability, with simultaneous production cost reducing.

2 dwg

FIELD: articles of personal use.

SUBSTANCE: invention relates to blades for razor set and method of blade forming. Method of blade forming for razor sets involves application of at least one polymer material with upper and lower surfaces on the edge of at least one blade by isostatic pressing to obtain isostatic pressing coating on the edge of at least one blade. Isostatic pressing can be performed hot or cold. Polymer material can be a fluoride or non-fluoride polymer.

EFFECT: thin, solid and even coating is formed on blade edges, reducing initial cutting force and thus improving shaving comfort.

17 cl, 5 dwg

FIELD: metallurgy.

SUBSTANCE: proposed method comprises application of wear-proof powder by detonation deposition on inner cylindrical surface of the hub of diametre D and length L with the help of detonation barrel of diametre d equal to (0.7-0.8)D. Detonation unit barrel is set at (2-3)D from inner cylindrical surface and directed at inclination thereto of arctg(D/L)±5°. Barrel is aimed at the center of deposited collar, that is, at the point located at inner cylindrical surface at spacing of L/2±1 mm.

EFFECT: higher quality of applied wear-proof coat.

7 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and can be used for making wearproof coatings on part surface with feed of reconditioning compositions on part surface and plastic deformation by nonabrasive ultrasound finishing. Revitalisant layer is applied on metal part surface to perform nonabrasive ultrasound finishing with transverse working head feed relative to part surface at 0.26-0.08 mm/rev to surface roughness Rα=0.3-0.125 mcm.

EFFECT: decreased roughness owing to crushing of micro regularities to Rα=0,125 mcm, extra surface hardening to depth of up to 100 mcm.

3 ex, 1 tbl

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular to the heat treatment of magnetically hard alloys of an iron-chrome-cobalt system used for the manufacture of permanent magnets. The method of heat treatment of the magnetically hard alloys of the iron-chrome-cobalt system with the cobalt content of 8 wt % comprises homogenisation, training, thermomagnetic treatment with the subsequent multistage tempering, at the last step tempering is performed at the temperature of 420°C.

EFFECT: values of magnetic hysteresis properties, including coercive force HcB and the maximum energy product (VN)max are increased.

1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to heat treatment of carbon tool steeps. This process comprises quenching of steels from 760-780°C and, then, subjecting them to pulsating subsonic airflow at the room temperature and 1130-2100 Hz and sound pressure of 120-140 dB.

EFFECT: high hardness and low brittleness.

FIELD: heating.

SUBSTANCE: accessory for supporting of a ring-shaped workpiece for its transportation and heating by a heating device includes a central assembly, a rotating drive mechanism located in the central assembly and a workpiece support. The support is connected to the central assembly and has a possibility of the workpiece location on the support and enveloping the central assembly. The support includes several rotating rollers located in a circumferential direction around the central assembly. The central assembly includes a transporting connecting section intended for suspension of the workpiece support together with the workpiece arranged on the support, a drive connecting section transmitting a traction force to the rotating drive mechanism and a rotating drive mechanism intended for rotation of rollers by means of traction force to ensure rotation of the workpiece in the direction of the ring-shaped workpiece. The heating device for heating of the ring-shaped workpiece includes a loading section in which a workpiece is installed on the accessory, a heating section containing a heater intended for heating of the workpiece installed on the accessory, a forwarding mechanism intended for transportation of the accessory in a suspended state between the loading section and the heating section. The transporting connecting section is connected to the forwarding mechanism.

EFFECT: simpler heat treatment process of ring-shaped workpieces.

15 cl, 18 dwg

FIELD: heating.

SUBSTANCE: invention relates to the recovery heat treatment of units of water-to-water power reactors (WTWPR). The method of recovery of physicomechanical properties of the material of intra-housing devices of the water-to-water power reactor after the action of operational factors includes extraction of the intra-housing devices from the reactor housing and their subsequent heat treatment providing heating, conditioning and cooling, heating is conducted up to the temperature of 975-1025°C, conditioning is performed at this temperature within 120-130 h, and cooling is conducted in air.

EFFECT: increase of the service life and ensuring the safe operation of VVER-1000 reactors.

1 tbl, 1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy, particularly, to production of metal strip with mechanical properties varying over strip width. The strip is heated, cooled and overaged at continuous annealing. Note here that at least one of the following parameters varies over the strip width: heating rate, maximum temperature, holding duration at maximum temperature and cooling trajectory after maximum temperature. Note here that at least one of the following parameters varies over the strip width at overaging: rate of heating to maximum temperature, duration of holding at maximum temperature, cooling trajectory after maximum temperature, overaging temperature, duration of holding at overaging temperature, minimum temperature before reaging and rate of heating to reaging temperature. Note here that at least one cooling trajectory follows the nonlinear temperature-time curve.

EFFECT: metal strip with mechanical properties varying over strip width.

15 cl, 8 tbl, 4 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building, particularly, to surface hardening with production of quenched structures. To up wear resistance of parts from quenched metals, primarily, of iron-carbon alloys and to get hardened surface layer with uniform properties, part surface layers is cut layer-by-layer over narrow side by cutter with cutting and forming edges. Note here that cut layers are deformed by tool working surfaces. Then, cut layers are placed on the part by the tool forming edge. In cutting of surface layer, its plastic straining and friction against the tool, tool geometrical parameters and machining parameters are selected to heat cut layer above phase transition temperatures for given machine material. Cut layer is cooled down by conductive heat removal to the blank or by appropriate cooling means.

EFFECT: higher wear resistance.

6 cl, 6 dwg

FIELD: measurement equipment.

SUBSTANCE: invention relates to methods for establishing a possibility of thermal alignment of different structural steels in cladded products and can be used in organisations of power industry, in design and scientific and research organisations at design and manufacture of power equipment. In order to provide compatibility of structural steels of the cladded product, the method involves preparation of standards from each steel, their thermocycling, as per the results of which residual voltages of the first kind are calculated after the corresponding temperatures of thermocycling. Relationships between residual voltages of the first kind and temperature of thermocycling for each standard and ultimate strength σB for each of the considered steel are determined. Difference modulus of residual voltages of the first kind of standards is compared at operating temperature of the product to the minimum value of ultimate strength σB at the same temperature. As per results, thermal compatibility of structural steels used in the cladded product is determined, for which difference modulus of residual voltages of the first kind at the thermocycling temperature of standards shall be lower than the minimum value of ultimate strength σB values.

EFFECT: providing compatibility of structural steels of a cladded product.

2 dwg, 4 tbl, 3 ex

FIELD: process engineering.

SUBSTANCE: invention relates to surface hardening by electric contact thermal processing. Proposed process comprises machining of rail head by mobile device directly at tracks without dismantling of rails. Machining is performed by electric contact heating with electric current passing through contact elements pressed against machined surface. Heating zone and rail head with critical surface wear of 1.5-2.0 mm and martensitic structure are, then, cooled. Rail head heating is performed to quenching temperature of 850°C and cooled by water with temperature of 18-20°C. Before thermal processing, rail head surface is corrected by finishing. Proposed device is composed of car on flanged wheels, its frame being made up of fixed and moving parts. Frame fixed part is provided with guide slides to displace frame moving part arranged perpendicular to frame moving part motion direction. Said frame moving part has sliding heating contact elements arranged on both sides, grinding heads with drive composed by brackets and telescopic bars, heating contact rollers and cooling device with jets. Note here that frame moving part is engaged with fixed part by two-way hydraulic cylinder with two-way rod. Heating elements and grinding heads are provided with regulators of force of pressing to rail head working side surface and connected with telescopic bars via isolating elements. Heating contact roller has current collector with cushion springs.

EFFECT: higher wear resistance and longer life of tracks.

7 cl, 1 tbl, 5 dwg

FIELD: machine building.

SUBSTANCE: thread strengthening method involves formation of a laser spot at the bottom of a thread groove in its centre and movement of the laser beam in relation to the longitudinal axis at simultaneous rotation of an item, the value of the laser beam movement is equal to the value of the thread pitch per one revolution, the laser spot is formed at specific density of radiant energy of a gas laser operated in continuous mode equal to 12-20 Wt/cm2, and the laser spot diameter is chosen as per the proportion d=(1.2-1.7)s, where d - laser spot diameter, s - thread pitch.

EFFECT: increased thread strength and productivity.

3 cl, 1 dwg

FIELD: metallurgy.

SUBSTANCE: along the whole section and the length of the rolled product the annealing of the calibrated rolled product is performed at 770-790°C within 3-4 hours, cooling with the furnace down to 660-680°C, holding 3-4 hours, cooling with the furnace down to the temperature 140-150°C with holding 1-2 hours, further cooling in air, primary drawing with the shrinkage 17-19%, heating in the furnace with the monitored atmosphere, patentising at 440-460°C, secondary drawing with the shrinkage 4-5%.

EFFECT: high strength and plastic characteristics.

1 tbl, 1 ex

FIELD: physics, optics.

SUBSTANCE: invention relates to the technology of making complex holes using a laser beam, particularly a through hole for film cooling of a turbine component. At the first step, the internal part (7) of the hole (1) is made from the surface (12) to the opposite internal surface (13) of the substrate (4) using a laser (22) located in a first angular position (1) and simultaneously making a diffuser (10) part. The diffuser (10) residue (16, 18, 28) is removed at the next second and third steps. At the second step, the angular position of the laser (22) is changed to a position (II), different from angular position (I), and the laser is moved to the angular position (II) until the lateral side (17a) of the diffuser (10) is open and part of the volume (18) of the residue (16, 18, 28) remains. At the third step the angular position of the laser is changed from the angular position (II) at the second step so as to remove said residue (18). The angle in the angular positions (I, II, III) is defined as the angle between the middle line of the laser beam (25) and the surface (12) around the film cooling hole (1).

EFFECT: using a laser in three different angular positions relative to the processed substrate significantly simplifies the making of complex holes in the substrate.

13 cl, 12 dwg

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