The method of obtaining the cutting tool of chemical-heat treatment with the formation of self-assembled wear layers of carbides
The invention relates to the field of metallurgy, in particular to integrated chemical-thermal treatment of the grinding tool steels. Method for obtaining cutting tool of chemical-heat treatment with the formation of self-assembled wear layers of carbides, including machining tool in final size, the subsequent chemical plating by deposition of the phosphor layer of Nickel of a thickness of 5-35 μm, heat treatment to melt the coating in the filling of the powder of boron carbide fraction 25-40 μm at a temperature of 960-1050oC for 10-20 min with cooling at a rate of 0.2 to 2.5oWith up to 500-600oWith, then arbitrarily with microwave and subsequent unloading. The technical result of the invention is to improve the wear resistance, strength, uniformity of the produced layers on grinding and cutting tool. 11 C.p. f-crystals, 2 ill., table 1. The invention relates to the field of metallurgy, in particular to the chemical-thermal treatment of cutting tools, mainly grinding with the formation of wear-resistant carbide layers on less refractory substrate obtained galvano-chemical methods. Proposed is in mechanical engineering and special equipment when more erosion-resistant parts in ion plasma flows.The objective of the invention is the improvement of wear resistance, strength, uniformity of the produced layers on the disk and the end cutting tool for various purposes.Closest to the claimed method is a technology for producing wear-resistant coatings on the parts and tools to build self-organizing wear layers ("mechanical engineering", 2000, 3, S. 31-34), including machining tool in final dimensions, chemical plating deposition layer of phosphor-Nickel, heat treatment to melt the coating in the filling of the powder of boron carbide and unloading after cooling from the temperature of melting.In the proposed method of processing to produce wear-resistant layers machined to the final dimensions of the tool is subjected to chemical plating deposition layer of phosphorous Nickel thickness of 5-35 μm, and heat treatment to melt the coating is carried out in the filling of the abrasive powder of boron carbide fraction 25-40 μm at a temperature of 960-1050oC for 10-20 min with cooling at a rate of 0.2 to 2.5oWith up to 500-600oWith, then arbitrarily with oven.This will involve the formation of a flange of westeuropa with low critical speed quenching for the manufacture of the tool. While conducting vacuum heat during the melting of the sublayer in the vacuum of 10-10-2PA with the laying tool fixture of heat-resistant boronitrides ceramics and application named ceramics to protect the seats from the carbide coating layer, and the use of boron carbide of various factions to interact with the top and bottom surfaces of the tool when fusing Nickel phosphide. One of the steels with low critical speed quenching selected heat-resistant steel with 3% chromium 4H3VMF and also unloading tool from the vacuum oven at 150-200oAfter finish the martensite transformation.The selected ratio of the thickness nikeshoesvogue coatings, sizes, fractions of the powder of boron carbide and temperature time intervals vacuum melting allow to obtain a wear-resistant layers with a uniform distribution of carbide particles in a matrix sublayer, with a smooth change in the hardness of the sublayer and transition diffusion zone with a maximum hardness of grains of boron carbide in the outer part of a self-organizing multi-layered structure. Selected intervals of melting temperatures, as well as the dwell time allows not only to increase the thickness of the layers, the oC/C when receiving the highest strength properties of buildings from steels with low critical speeds quenching. At the same time virtually eliminating thermal and structural deformation tool, the ability to save a cool landing size, which leads to minimization of the processes of grinding and finishing tool after high temperature reflow.The invention is illustrated in the drawings of micro - and macro-structures self-assembled layers on several steels. In Fig.1A, 1B shows a schematic of the formation of the carbide layer on a disk tool, the last coating of Nickel-phosphorus and subsequent melting layer in the filling of the powder of boron carbide, where: 1 the tool body made of carbon steel, cast iron and heat resistant steel, 2 powder of boron carbide predetermined fraction, with the contact of the upper and lower surfaces of the instrument, 3 - snap from the neutral heat-resistant ceramics Bernardino.In the implementation of manufacturing and processing tool according to the present method for the deposition of Nickel-phosphorus applied coating compositions of the baths in solutions which contained hypophosphite sodium 35-40 g/l, Nickel sulfate 25-30 g/l, thiocarbamide 0.2-0.3 g/l and equal dubawi baths and a two-stage deposition layer thickness in the range claimed. High temperature heating with the reflow of the coating in zasilek from a powder of boron carbide were in the bell-type vacuum electric furnaces GWA-2.4/15-S2 and GWA-2.4/15-I3 when the vacuum 10-1...10-2PA.Example 1. Grinding disks with a diameter of 120 mm and a thickness of 3 mm made of carbon steel 20 is first subjected to machining by abrasive surfaces and planting holes, then covered with a layer of Nickel-phosphorus with the formation of the layer thickness of 35 μm, and then heated in vacuum at 980oC for 15 min in the filling of the powder of boron carbide fraction of 25 μm and cooled at a rate of 0.2oC/C to 500oWith, next to the oven to 100oWith and discharging into the air.In Fig.2 shows fractorama from the working surface and the microstructure of the wear-resistant layer with wear uniform abrasive layer of high wear resistance. The table shows the sequence and processing modes, as well as the comparative properties of the grinding disk during processing of amber.The wear resistance of the disk when high-speed grinding of natural amber at speeds processing 3600-4200 min-1increased 1.5-1.8 times in comparison with the prototype.Example 2. Grinding attachment circles with a diameter of 140 mm with flange up to 5 mm when Eatery was subjected to application of the coating layer of Nickel-phosphorus with a thickness of 20 μm, followed by melting in a vacuum in the filling of the boron carbide fraction 30-50 μm and regulated by the rate of cooling from a temperature of 1000oWith up to 600oWith, which amounted to 1oC/C, then with oven arbitrarily. Processing is allowed to form a wear-resistant layer, comparable properties with layers of synthetic diamond.Example 3. Grinding heads with a diameter of 11 mm, a length of 85 mm was secured with the formation of the working part on the proposed method. After turning in the final dimensions of the spent chemical Nickel-phosphating (hemicellulase) forming a layer with a thickness of 30 μm. Subsequent vacuum treatment installation slipheaven working part down in the filling of boron carbide fraction 50 μm in a cellular adaptations of heat-resistant ceramics BGP. After melting of the coating when the temperature of 1020oWith over 12 minutes were cooled at the rate of 2oC/C to 550oWith, then microwave arbitrarily up to 80oWith unloaded from the vacuum chamber into the air.The treatment allowed to obtain self-organizing layers on the working surface, the thickness of 540-550 μm by changing the hardness of the carbide layers H0.5 H= 2600-3300, hardness transitional zones H0.5 H=1900-2500, the hardness of the enveloping phase H0.5 H=610-780, hardness sublayer N0.5 H=1100-1130, with a smooth transition to the base metal, andgain self-tool with the characteristics of the grinding 1.4-1.5 times higher than known and durability, the cleanliness class of the sanding surfaces of the screens from paroniria boron PPF higher manufactured by known techniques. Selfgrowth were universal and allowed to grind holes in precision alloys 29NK, high-strength steels type NB. At the same time ensured a high corrosion resistance in different cooling environments and emulsions, as well as increased hardness and strength of the mounting portion of the polishing heads.
Claims1. The method of obtaining the cutting tool of chemical-heat treatment with the formation of self-assembled wear layers of carbides, including machining tool in final size, the subsequent chemical plating by deposition of a layer of phosphor-Nickel, heat treatment to melt the coating in the presence of a powder of boron carbide and unloading, characterized in that in the process of chemical Nickel plating is precipitated by the phosphor layer of Nickel of a thickness of 5-35 μm, and heat treatment to melt the coating is carried out in the filling of the abrasive powder of boron carbide fraction 25-40 μm at a temperature of 960-1050oC for 10-20 min with cooling at a rate of 0.2 to 2.5oWith up to 500-600o3. The method according to p. 1, characterized in that for the manufacture of tool use casting grey cast iron.4. The method according to p. 1, characterized in that the tool is made of chromium steel with 3-4% chromium with a low critical speed hardening.5. The method according to p. 1, wherein the heat treatment is carried out in the vacuum of 10-10-2PA.6. The method according to p. 1, wherein the heat treatment is performed on the devices of the heat-resistant boronitrides ceramics.7. The method according to p. 1, characterized in that the heat treatment of a Seating surface of the tool protects the installation of traffic from boronitrides ceramics.8. The method according to p. 1, characterized in that the tool bottom part in contact with the coarse-grained non-wetted abrasive.9. The method according to p. 1, characterized in that the upper tool and the lower part is in contact with the same abrasive different factions.10. The method according to p. 1, characterized in that the tool use strip steel HSPSP.11. The method according to p. 1, characterized in that the unloading of the vacuum furnace is carried out at 150-200oC.12. The method according to p. 1, characterized in that during thermal processing using a ceramic snap out gently
FIELD: metallurgy, namely chemical and heat treatment of refractory alloys, possibly used for applying protective coatings onto blades of gas-turbine engines.
SUBSTANCE: method comprises steps of applying onto inner and outer surfaces of parts diffusion aluminide coating in circulating gaseous medium; applying coating in low-active system at relation of reaction surfaces Fн/Fo = 0.3 - 0.7, where Fн - total surface of parts to be coated; Fo - total surface of saturating mixture; then applying onto outer surfaces of parts cladding coating, namely MeCrAlY, where Me - Ni, Co, NiCo by ion-plasma process or electron beam evaporation in vacuum.
EFFECT: improved fire and corrosion resistance of coating, increased resource of blades of gas-turbine engine.
1 cl, 1 ex, 1 tbl
FIELD: metal coats, in particular for gas turbine engines operating at high temperature.
SUBSTANCE: claimed metal coat contains (mass %) cobalt up to 18; chromium 3.0-18; aluminum 5.0-15; yttrium 0.1-1.0; hafnium up to 0.6; silicium up to 0.3; tantalum 3/0-10; tungsten up to 9.0; rhenium 1.0-6.0, molybdenum up to 10, and balance - nickel. Method of invention includes providing of support from at least one metal materials based on nickel, cobalt or iron followed by application of coating layer.
EFFECT: coats of high oxidation resistance and endurance strength.
33 cl, 1 tbl
FIELD: metallurgy, namely processes for applying wear resistant chrome carbide coatings, protection of surface of articles of titanium and its alloys against action of aggressive media, abrasive wear and high temperature influence.
SUBSTANCE: method comprises steps of applying sub-layer of metal and further applying of wear resistant chrome carbide layer by pyrolysis of chrome-organic compounds of bis-arene. Before applying wear resistant layer of chrome carbide, sub-layer of nickel or its alloys with thickness 0.1 - 10 micrometers is applied.
EFFECT: possibility for applying on titanium and its alloys wear resistant coating with enhanced adhesion degree of coating and substrate and with improved strength against crumpling at elimination of cracking.
4 cl, 1 tbl, 4 ex
FIELD: corrosion prevention technologies.
SUBSTANCE: method includes serial application of layers of polymer compositions to metallic surface, while serial layers of polymer compositions are made with various thermal expansion coefficients. As said polymer composition polyurethane compound is used with special admixtures and filling agent, influencing thermal expansion coefficient of covering layer, and content of said filling agent in each following layer is set less than content of said filling agent in previous layer.
EFFECT: higher efficiency.
2 cl, 9 ex
FIELD: electrochemical technologies.
SUBSTANCE: method includes dipping zinc-covered article in chromium-containing solution, prior to dipping electrolytic application of zinc is performed onto previously cleaned surface of zinc-covered article with following washing and drying, and after chromatizing article is dried by hot air.
EFFECT: protective cover, resistant to corrosion effect in atmosphere, polluted with industrial gases, and to effect from external loads of direct and alternating character, to provide for higher reliability and durability of article.
FIELD: mechanical engineering; methods of formation of shaped pieces out of a sheet steel.
SUBSTANCE: the invention is pertaining to the field of mechanical engineering, in particular, to the methods of formation of shaped hardware products from sheet steel. The offered method provides for a chemical-thermal treatment of slab billet in depth from the side of a form-shaping surfaces and a profiling. At that thus before realization of the chemical-thermal treatment conduct cleansing of the whole surface of the slab billet, on one or both cleansed surfaces superimpose a drawing determining the form of the bent pieces and on the determined area apply a layer of stannum or eutectics Pb-Sn, coat the rest area of the slab billet with a hermitic varnish, and the chemical-thermal treatment conduct by aluminizing. In particular cases of realization of the invention the cleaning is conduct by working. The aluminizing is carried out for 3-5 minutes: on a clean surface apply a drawing using a metallic pencil; a layer of stannum or eutectics Pb-Sn apply by a galvanic method. The technical result of the invention is application of methods of chemical-thermal treatment, in particular, the aluminizing for production of bent-shaped pieces with a protective coating.
EFFECT: the invention offers methods of chemical-thermal treatment, in particular, the aluminizing for production of bent-shaped pieces with protective coatings.
5 cl, 3 dwg, 2 ex
FIELD: working of steel products, possibly restoration of worn surfaces of cylindrical articles such as cylinders of sucker rod depth pumps.
SUBSTANCE: method comprises steps of mechanical working, iron plating of inner surface of article, carburization, chrome plating and further heat treatment with isotermal soaking at temperature of obtaining large-flake pearlite.
EFFECT: restoration of geometry parameters of inner surface of worn cylindrical articles, enhanced strength and predetermined surface roughness of articles.
FIELD: methods of hardening of restored surfaces of steel products.
SUBSTANCE: the invention is pertaining to the field hardening of metallic surfaces of steel products. The offered method includes a cyanidation of the electrodeposited layer of an iron-molybdenum coating within 1-4 hours at the temperature of 600-650°C with usage of a paste of the following composition (in mass %): yellow bloody salt - 30...45, sodium carbonate - 8...10, calcium carbonate - 5...10, carbon-black - up to 57. The technical result of the invention is boosting hardness and a wearability of surfaces of steel component parts.
EFFECT: the invention ensures an increased hardness and a wearability of surfaces of steel component parts.
FIELD: methods of production of antiemission coatings.
SUBSTANCE: the offered invention is pertaining to formation of coatings and may be used for production of antiemission coating on grids of powerful oscillating tubes. The offered method includes formation of a layer of the tube grid material carbide, application of a layer of zirconium carbide from a metallic plasma of the vacuum-arc discharge at the temperature of the grid above 300°C, formation of shaping of a surface layer of platinum and an annealing. The technical result of the invention is development of a method of production of the intermetallic antiemission coatingPt3Zr having improved operational features.
EFFECT: the invention ensures production of the intermetallic antiemission coating with improved operational features.
1 tbl, 4 dwg