455results about How to "Good metallurgical bond" patented technology

A laser cladding process of an exterior wear-resisting anti-corrosive alloy coating of a slide chair of a railway switch comprises processes as follows: firstly, the surface of the slide chair is pre-heated, which means the surface of the slide chair is degreased and de-rusted under room temperature; and the surface is cleaned up by alcohol; then alloy powder is prefabricated, which means iron-base, nickel-base or cobalt base alloy powders that are ready for cladding are preplaced on the processed surface of the slide chair, and a scraping straightedge provided with a rail is used for adjusting the pretreated metal powder so that the alloy powder can be distributed on the surface of the slide chair evenly and has proper thickness to meet the thick requirement of the coating after cladding; and finally, the slide chair is hardened by the laser cladding; the laser of CO2 gas is adopted; a numerical control machine is used as a working table and the surface of the slide chair is hardened by the laser cladding. The laser cladding process has the characteristics of no pollution, high production rate, low energy consumption, the little finishing allowance of cladding coating and low combined cost.

The invention discloses a composite reinforced wear-resistant part of a metal-ceramic prefabricated member and a manufacturing method of the composite reinforced wear-resistant part. The manufacturing method comprises the steps as follows: uniformly mixing ceramic particles with self-fluxing alloy powder to obtain a mixture; filling a mould cavity of a pressing machine with the mixture, pressing by pressure, forming and demoulding, and placing biscuits and gaskets into a drying box for drying; placing the dried biscuits and gaskets into a vacuum furnace for sintering, cooling and discharging to obtain the metal-ceramic composite prefabricated member; carrying out sand blasting on the prefabricated member, and spraying a layer of nickel-based self-fluxing alloy powder onto the surface of the prefabricated member; and placing the processed fabricated member onto the end surface of a cast cavity, and pouring metal liquid formed by smelting metal matrix materials into the bottom of the cast cavity to obtain the composite reinforced wear-resistant part of the metal-ceramic prefabricated member. According to the manufacturing method, the wear resistance and the impact resistance of the composite wear-resistant part are improved.

An abrasive composite particle comprising a cubic abrasive core particle encapsulated within a deposit of hexagonal metallurgical bond forming material comprising at least about 50 volume percent rhenium, ruthenium, osmium or mixtures thereof. The metallurgical bonds serve to retain the core particle in a matrix/binder very strongly. Metallurgical bonds are formed by the encapsulating material taking into solution, at the interface with the cubic abrasive core particle, some element or compound from the abrasive particle such as, for example, carbon or cubic boron nitride, from the core particle. Chemical bonds are not formed between the abrasive particle and the deposit. Suitable abrasive core particles include diamond, cubic carbides, cubic borides, cubic nitrides, cubic oxides, and the like. Conventional fabrication procedures such as chemical vapor deposition are employed to form the metallurgical bond forming deposit on the core particle. The composite abrasive particles are useful in forming articles according to conventional powdered metal processing operations. The articles so formed are useful for their hardness as well as their abrasiveness.

The invention is a nano-particulate demulsifying agent used in demulsification of trinary oil recovery produced fluid. The application of new technique of trinary oil recovery enhances the crude oil recovery, where the polymer injection oil-recovery technique increases the oil, obviously, but also causes the difficulty in demulsifying the produced fluid at the same time. Its character lies in that: the nano-particulate demulsifying agent is composed of particle nucleating material which processes the surface of nano silicon oxide material by silane coupler and fluorine compound and reacting solvent containing arenes as dimethylbenzene, as well as polyether demulsifying agent as multicomponent polyether, amine polyether and resin polyether. It effectively solve the problem about the demulsification of trinary oil recovery polymer injection produced fluid, field used quantity little, demulsifying speed rapid, dehydrating efficiency high and oil-water interface regular.

The invention relates to a preparation method of a biological ceramic coating rich in calcium and phosphate phases on the surface of magnesium alloy, comprising the following steps of: adding (C6H5O7)2Ca3.4H2O and Na3PO4 to deionized water, and simultaneously adding KOH, NH4HF2, N(CH2CH2OH)3, C3H8O3 and H2O2 to prepare an electrolyte with a certain concentration ratio of calcium and phosphate; disposing the magnesium alloy in the electrolyte as an anode which is prepared through micro arc oxidation energization reaction. The calcium-phosphate ceramic coating obtained by the preparation methodconsists of three layers of a loose layer, a transition layer and a compact layer, wherein the surface of the loose layer consists of a plurality of uniformly distributed micropores, the transition layer is between the loose layer and the compact layer, and the compact layer and a substrate body form good metallurgical bonding; therefore, the coating has high rigidity, high density, high bonding force and good corrosion resistance and abrasion resistance; simultaneously, the mouse acute systemic toxicity test indicates that the coating has good biocompatibility, and the simulated body fluid soaking test indicates that the coating has good biological activity.

The invention discloses a tool for strengthening a blade through the laser cladding technology. The tool comprises a tool body and a handle. The position of a cutting edge line of the tool body is provided with a cladding layer in a cladding manner, wherein the cladding layer is formed by abrasion-resisting hard alloy mixed powder. The hard alloy mixed powder is formed by mixing nickel-base alloy powder and tungsten carbide powder according to the proportion. By mass percent, the nickel-base alloy powder accounts for 40%-70%, and the tungsten carbide powder accounts for 30%-60%. The nickel-base alloy powder comprises, by mass percent, 18%-23% of Cr, 4%-7% of Fe, 2%-4.5% of Nb, 8%-11.5% of Mo, 0.2%-0.4% of Al, 1%-2.5% of Ti, 0.1%-0.6% of C, 0.2%-0.5% of Si, 0.2%-0.6% of Mn, 1.5%-2.5% of V and the balance Ni. The tool has the beneficial effects that the cladding layer and the tool body are in well metallurgy combination, the structure of the cladding layer is fine and uniform, and the dilution rate is low; after the tool body is sharpened, the hardness, sharpness, abrasion resistance and corrosion resistance of a blade part are greatly improved, cost is low, the hardness of the blade part is improved, and meanwhile tenacity cannot be reduced.

The invention discloses a preparing method for a porous metal matrix compound brazing filler metal alloy soldering head. The method adopts porous metal matrix compound brazing filler metal alloy filled up with brazing filler metal alloy, a compound brazing filler metal layer is prefabricated between hard base metal, then the brazing filler metal alloy filled into the porous metal layer is heated to melt, and a tool head of an ultrasonic vibrating device acts on the surface of the base metal and exerts certain-pressure certain-time ultrasonic vibration on the surface of the base metal to finish a brazing process. When the method is used for preparing the brazing soldering head, the porous metal with high melting point can have a supporting function to a soldering seam layer in a brazing soldering process, the liquid-phase brazing filler metal alloy is prevented from being extruded out excessively in the ultrasonic vibration action. Thus, the preparation of the brazing soldering head with a large fuse face is achieved. In addition, the porous metal layer in the brazing seam layer can reduce the thermal expansion coefficients of the brazing seam layer, and the strength of the brazing seam layer and the strength of the connection interface between the brazing seam layer and the base metal are improved.

The invention discloses a composite material hammerhead of a crusher and a negative pressure casting method thereof. The negative pressure casting method comprises that: firstly, a metal parent material is subjected to electric smelting to form molten metal; WC particles and a bonding agent are mixed and prepared into paste, the paste is filled in a columnar metal screen which is then baked in a sealed mode to form a prefabricated body, and the prefabricated body is placed on the end face side of a mould cavity; a vacuum pump is started 5 minutes earlier than the tapping of the molten metal, and then the molten metal is tapped off for casting; and the vacuum pump is switched off after 4 minutes of the casting completion. The composite material hammerhead hammer body obtained by the preparation method is made of high manganese steel, alloy steel or common carbon steel; a hammer end, namely a working face or a striking face consists of a metal matrix and columnar reinforcers uniformly distributed in the metal matrix, wherein the columnar reinforcers are made of a composite material formed through infiltration of a ceramic particle prefabricated body and mother liquor metal, and have the hardness of HRC55-67 and excellent impact abrasion resistance; and the interface of the columnar reinforcers and the metal matrix, and the interface of the WC particles in the reinforcers and a substrate have good metallurgical bonding and high bonding strength.

The invention relates to a metal surface cladding layer and a preparation method thereof, in particular to an iron-base alloy gradient cladding layer and a preparation method thereof. The cladding layer is composed of a bottom cladding layer, a sandwiched cladding layer and a top cladding layer sequentially arranged on a base body, the three cladding layers are obtained by cladding of three kinds of different iron-base alloy powder layer by layer, and the three kinds of iron-base alloy powder comprise FJ-1 powder, first iron-base alloy powder and high-ferrochromium-base alloy powder; when the cladding layer is prepared, each kind of powder undergoes laser cladding according to specific process parameters, the inter-layer laser stopping time is 10 minutes, inter-layer laser scanning paths are perpendicular, and finally the gradient cladding layer with the cladding thickness being 2.75 mm and the surface hardness being 60 HRC can be formed. The cladding layer is mainly characterized in that the microhardness values of the three layers are not uniform. The gradient cladding layer technology is applied to the wear area of steel work-pieces H13 for repair and is wide in application prospect of fast forming components on the steel work-pieces H13.

The invention discloses a railway vehicle axle repair process. The process comprises the steps of pretreatment, laser cladding, residual stress relaxation and machining, wherein in the laser cladding step, the adopted metal powder comprises, by mass, 0.1-0.25% of carbon, 17.5-28% of chromium, 10.5-16% of nickel, 0-0.65% of boron, 0.12-1.0% silicon, 0-4.5% of molybdenum, 0-0.8% of manganese and the balance being iron. A vehicle axle repaired through the process is small in microstructure, free of the defects such as air holes, slag inclusion and cracks and capable of meeting the requirement for use performance; the service life of the repaired vehicle axle reaches or exceeds that of a new axle. The railway vehicle axle repair process has the advantages that operation is easy, the controllability is good, the damaged vehicle axle can be repaired quickly in a short time, the cost for replacement of the damaged axle with the new axle is lowered, the use cost of the vehicle axle is lowered, harm of the discarded vehicle axle to the environment is reduced, and environmental friendliness is achieved.

The invention discloses a method for manufacturing multi-core MgB2 superconductive wires through the extrusion technology. The method includes the steps that first, precursor powder is prepared; second, the precursor powder is installed in a pipe to prepare a primary complex, and single-core wires are obtained through drawing machining; third, the precursor powder is installed in a pipe to prepare a secondary complex; fourth, the secondary complex processed through pre-heating seal welding is extruded, and multi-core rods are obtained; fifth, the multi-core rods are stripped and drawn to obtain multi-core wires, the multi-core wires are subjected to heat treatment, and then the multi-core MgB2 superconductive wires are obtained. According to the method, on the basis of a traditional power pipe-installing technology, a large single-pass machining deformation amount is adopted for manufacturing the multi-core MgB2 superconductive wires, in other words, the extrusion technology is adopted for manufacturing the multi-core MgB2 superconductive wires, because the secondary complex is in a very favorable three-dimensional stress state in extrusion, good metallurgical bonding will be achieved between different metal interfaces in the secondary complex along with the large extrusion deformation amount, the manufactured multi-core rods are high in composite strength, and the compactness and the yield strength of the multi-core MgB2 superconductive wires can be significantly improved.

The invention discloses a process of laser-cladding a rare earth CeO2-nickel-based alloy composite coating on the surface of an aluminum or an aluminum alloy. The process comprises the following steps: first, coating a layer of rare earth CeO2-nickel-based self-refluxed alloy powder on the surface of the aluminum alloy by a laser surface cladding technology; then, scanning the powder layer by laser to melt and clad the powder layer on the surface of the aluminum alloy to form a rare earth CeO2-nickel-based self-refluxed aluminum alloy cladding layer. According to the process disclosed by the invention, the rare earth CeO2-nickel-based self-refluxed aluminum alloy cladding layer with high performance is prepared by taking the aluminum or the aluminum alloy as the base body material by means of the laser surface cladding technology, so that good metallurgical binding between the cladding layer and the base body material is realized, and the performances of the material such as wear resistance, corrosion resistance and resistance to oxidation are improved.

The invention belongs to the technical field of abrasion-resistant materials and discloses a high-tungsten high-abrasion-resistant high-speed steel composite roller and a preparation method thereof. The high-tungsten high-abrasion-resistant high-speed steel composite roller comprises a roller core, a composite roller outer layer and a composite roller transition layer, wherein the roller core and the composite roller transition layer are made from ductile iron, and the composite roller outer layer is made from high-tungsten high-speed steel. The preparation method includes: firstly, mixing, heating and melting ferrotungsten, ferrochromium, ferromolybdenum, ferrovanadium, waste steel and carburant in an electric furnace, regulating chemical compositions and mass fractions of the chemical compositions of liquid steel on the spot, and pouring the roller outer layer on a centrifuge, wherein the liquid steel comprises the chemical compositions, by weight, 2.2-2.5% of C, 6.5-6.8% of W, 8.6-9.0% of Cr, 4.2-4.5% of V, 2.5-2.8% of Mo, smaller than 0.45% of Mn, smaller than 0.76% of Si, smaller than 0.04% of P and smaller than 0.04% of S; secondly, pouring the transition layer; finally, filling the core to obtain the composite roller. The high-tungsten high-abrasion-resistant high-speed steel composite roller has excellent utilization effects after quenching and tempering treatment.

The invention relates to a method for preparing an anticorrosion wear-resisting iron-based amorphous coating through a laser cladding technology. Chemical components of Fe-based amorphous alloy powder comprise, by mass percent, 17.3% to 19.4% of Cr, 1.8% to 2.2% of Mn, 12.9% to 15.8% of Mo, 5.0% to 6.2% of W, 2.8% to 4.1% of B, 0.7% to 1.1% of C, 1.0% to 1.5% of Si and the balance Fe, wherein the total mass is 100%. The industrial pure raw materials and the tight coupling gas atomization technology are adopted for preparing the iron-based amorphous alloy with the components into powder stock, and the single-pass diode laser cladding technology is used for preparing the amorphous alloy coating. The preparing technology of the iron-based amorphous coating approaches to the actual industrial level, the technology condition is controllable, the cost is low, the beneficial effects of being compact in structure, uniform in structure, free of crack and hole defects, high in hardness, anti-corrosion, resistant to wear and the like are achieved, and the great utilization potentiality is achieved in the national defense industry.

The invention discloses a method for preparing a wear-resistance toughening coating layer on a surface of high-manganese steel. The method is characterized by comprising the steps of: (S1) pretreatment of a basal body before cladding, (S2) pretreatment of powder before cladding, (S3) cladding, and (S4) heat treatment after cladding. A plasma cladding technology, solid solution treatment and a coating layer surface aging process are adopted to prepare the Fe-Ni base alloy coating layer with high hardness, high wear resistance and high impact toughness; the surface hardness and the wear resistance of the basal body material are improved; the problem of easy cracking of a traditional hard particle reinforcing metal base wear-resistance coating layer under such conditions as medium and high stress is solved; and the prepared coating layer is excellent in metallurgical bonding with the basal body material, so that the comprehensive performance of the coating layer is greatly improved, the basal body material is protected more sufficiently, the service life of the basal body material is prolonged, and the application prospect is broad.