324results about How to "Improve wear and corrosion resistance" patented technology

The invention belongs to the field of material surface engineering and more particularly relates to a method for carrying out cladding on a high-hardness wear-resistant anti-corrosion nickel-based alloy material on a metal substrate E in a large area by applying a laser cladding technology, solving the problem of cracks generated in the laser cladding process of the high-hardness wear-resistant nickel-based alloy, in particular the cladding defects, such as cracks with the thickness of more than 1mm, pores and the like during large-area cladding. According to the invention, the high-hardness nickel-based alloy powder material is cladded on the surface of the metal substrate in the large area to form a high-hardness wear-resistant anti-corrosion nickel-based alloy coating by applying the laser cladding technology and adopting a scientific and reasonable process method. According to the method disclosed by the invention, stability and consistency of laser cladding are foundationally ensured, defects, such as cracks, pores, impurities can be prevented from generating, heat affected regions of the substrate are reduced, dilution rate is reduced, the high-wear-resistance anticorrosion nickel-based alloy coating with firm metallurgical bonding and fine and compact grains is obtained and has the hardness reaching 58-63HRC, and the service life of the processed workpiece can be prolonged by more than 1-2 times.

The invention discloses iron-based amorphous powder for wear-resisting and corrosion-resisting coating and a preparation method thereof, and belongs to the technical field of surface engineering. Iron-based amorphous alloy coating adopts iron as a main component, and also comprises amorphous phase (in at least 30 percent by volume), and the representation formula of all elements in percentage by weight is FeaCrbNicSidBeMnfCgMohNbiCujCokRel. The powder is prepared through direct ball-milling mixing in proportion of all components according to the required weight ratio. The powder can be used for not only laser cladding but also thermal spraying technology, mixed powder is melt by high-energy density laser beams, an iron-based amorphous or amorphous composite cladding layer is formed on the outer surface of a matrix, the cladding layer has the characteristics of higher wear and collision resistance, the dilution rate is low, the wear-resisting and collision-resisting service lives of a petroleum drill rod, an air compressor screw rod, a roller, a water-cooled wall pipe and an economizer pipe are remarkably prolonged, the process is simpler, and the manufacturing cost is low.

The invention discloses an asphalt pavement repair material, and belongs to the field of engineering materials. The asphalt pavement repair material is prepared from 20-60 parts of monomers of thermosetting polymers and/or prepolymers of the thermosetting polymers, 2-8 parts of an antioxidant, 1-8 parts of an accelerant, 10-30 parts of an admixture, 5-60 parts of the thermosetting polymers, 10-40parts of an initiator, 10-20 parts of a reinforcing agent, 1-60 parts of a diluent and 10-40 parts of aggregates. The asphalt pavement repair material has the advantages of being high in condensationrate, strength, waterproofness and abrasion performance and capable of repairing pavement and getting the traffic to move again in 30 minutes and making construction easy. According to a pavement repaired with the asphalt pavement repair material, the compressive strength can reach 100 MPa, the wet wheel abrasion value is smaller than 800 g*m<-2>, and the load wheel adhesion sand amount water immersion 1d is smaller than 450 g*m<-2>.

The invention discloses an iron-based nanocrystalline composite coating for protecting a boiler tail heating surface and a laser-cladding forming process of the iron-based nanocrystalline composite coating. The iron-based nanocrystalline composite coating comprises the following components in percentage by weight: 49.9-62.8% of Fe, 14.2-20.4% of Cr, 9.0-16.3% of Mo, 2.9-4.1% of B, 0.6-1.3% of C, 1.0-2.4% of Mn, 3.4-8.0% of W, 1.0-1.9% of Si and 0-3.9% of RE, wherein RE is a rare earth element. The forming process comprises the following steps: preparing alloy powder of the iron-based nanocrystalline composite coating; treating the surface of the boiler tail heating surface; preparing the iron-based nanocrystalline composite coating through a simultaneous powder feeding method and a laser-cladding method, wherein the laser cladding is performed for multiple times. The formed iron-based nanocrystalline composite coating is 1 mm above in thickness. The iron-based nanocrystalline composite coating can obviously enhance the wear resistance and corrosion resistance of the boiler tail heating surface, and reduce maintenance costs of worn and corroded parts and consumption of raw materials of a power plant.

The invention discloses a process for spraying a composite coating on a metal surface. The process comprises the following steps: carrying out purification treatment on the metal surface; carrying out laser burning treatment on the metal surface; carrying out explosion spray treatment on the metal surface, and preparing the composite coating; carrying out laser re-melting treatment on the composite coating prepared by an explosion spray process, on the metal surface. According to the combined process for spraying the composite coating on the metal surface, the explosion spray process is compounded with two laser heat treatment processes, so that the binding force of the coating and a matrix can be effectively improved, and the performances of corrosion resistance, wear corrosion and the like of the coating can be further improved.

The invention provides a method for a laser preparation of a titanium nitride gradient coating on a surface of titanium and titanium alloy. The method comprises the steps of performing surface cleaning treatment, surface blackening treatment and preheating treatment for a workpiece subatrate; and then carrying out laser nitriding treatment. The method is characterized in that the laser nitriding treatment is performed in a condition of filling reaction gas, and simultaneously laser scanning treatment and ultrasonic oscillating treatment for the surface of the workpiece subatrate are carried out. The titanium nitride gradient coating with a thickness of 50-200 [mu]m is obtained on the surface of the titanium and titanium alloy. The titanium nitride gradient coating is mainly composed of a nitride layer and a nitrogen diffusion layer, and has uniform transition of the coating microstructure. The surface hardness, wear resistance and corrosion resistance of the titanium nitride gradient coating are improved significantly than those of the matrix. Also, problems that crack are easy to produce, surface roughness is large, and the crystal grains of dendrite crystals of a nitride layer are coarse, in ordinary laser gas nitriding processes, are solved.

The invention discloses a superhydrophobic conductive composite fabric with the electromagnetic shielding performance and a preparation method thereof. The method comprises the steps that a polypropylene non-woven fabric is immersed in a dopamine solution, a self-polymerization reaction is conducted to obtain polypropylene non-woven fabric with the surface modified with polydopamine, then the fabric is immersed in a silver trifluoroacetate ethanol solution, a hydrazine hydrate solution is added for reduction, and finally the fabric is immersed in a PDMS n-heptane solution to obtain the superhydrophobic conductive composite fabric with the electromagnetic shielding performance. The conductivity of the superhydrophobic conductive composite fabric is up to 80 S/cm, the 72-dB electromagnetic shielding efficiency is achieved, the superhydrophobic performance is achieved, and the contact angle can reach 152 degrees, and excellent electromagnetic shielding performance can still be kept through multiple abrasion and winding and acid corrosion for 20 hours, and the fabric has the excellent abrasion resistance and corrosion resistance performance.

A high-precision valve resistant to abrasion and corrosion comprises a high-strength valve body resistant to abrasion and corrosion and 3D printed high-precision valve internal parts. The high-strength valve body resistant to abrasion and corrosion is made of raw materials in a cast mode, wherein special element matching is adopted for the raw materials. A 3D printing technology is adopted for manufacturing and assembling all the valve internal parts at the same time; finally, the high-strength valve body resistant to abrasion and corrosion and the 3D printed high-precision valve internal parts are assembled. The high-precision valve has the advantages that valve body is excellent in resistance to abrasion and corrosion; the production efficiency and precision of the valve internal parts are high, and the high-precision valve is convenient to assemble and stable in working.

The invention discloses a manufacture technology of a bimetal composite pipe, which comprises the following steps of: 1) smelting structure layer carbon steel liquid according to a smelting technology of a carbon steel oxidizing method, and smelting a base body structure high-chromium iron liquid according to a smelting technology of an alloy non-oxidizing method; 2) forming by means of centrifugal pouring, wherein a centrifugal metal molding paint can adopt resin-coated sand or water base zircon powder paint; 3) injecting the carbon steel liquid into a mould; 4) pouring the high-chromium iron liquid when the temperature of the surface of the carbon steel liquid reaches the semi-solidification status, forming a transition layer between two alloys, and mutually melding to form into an integrated casting piece; and 5) immediately putting the casting part into a heat preserving furnace or embedding into the sand after the casting part is demoulded to gradually reduce the temperature. By adopting the technology, the manufacture technology adopts the metallurgical combination without a gape between the carbon steel and the high-chromium iron, leads the composite pipe to have high use security, and has high wear-resistant and corrosion-resistant capability, thereby prolonging the service life of the composite pipe.

The invention discloses an iron-based non-crystalline composite coating for protecting heat exchange pipes in the flue gas waste heat recovery system of a power station boiler, and a laser re-melting and moulding technology thereof. The iron-based non-crystalline composite coating is composed of the following elements in percentage by weight: 55.1 to 66.2 wt% of Fe, 24.4 to 34.3 wt% of Cr, 2.4 to 3.4 wt% of B, 1.5 to 2.9 wt% of Si, 1.7 to 3.9 wt% of Mo, and 1.6 to 3.8 wt% of Nb. The moulding technology comprises the following steps: preparing iron-based non-crystalline cored wires, adopting an ultrasonic electric arc spraying method to prepare an iron-based thermally-sprayed alloy coating on the surface of a heat exchange pipe; and then adopting neodymium-doped yttrium aluminium garnet (YAG) laser as the heat source to carry out laser re-melting and moulding on the positions, which are prone to low-temperature acid dew point corrosion, on the thermally-sprayed coating so as to form compact iron-based non-crystalline composite coating; wherein the coating and the substrate are combine through metallurgy, and no crack and gap exists between the substrate and the coating. The provided coating prevents the transfer of the low-temperature acid dew point corrosion, thus prominently improves the service life of the flue gas waste heat recovery system, relieves the symptom of low-temperature acid dew point corrosion, and has a great application potential.

The invention belongs to the technical field of thermal-sprayed coating layers and relates to a composite functional coating layer capable of resisting abrasion and corrosion. The coating layer consists of the chemical components such as NiCrAlY alloy powder, metallurgical TiC powder and rare-earth oxide La2O3 powder, wherein the adding amount of the NiCrAlY alloy powder accounts for 49.5-80 percent of the weight of the powder of the whole coating layer; the adding amount of the metallurgical TiC powder accounts for 19.5-50 percent of the weight of the materials of the coating layer; the adding amount of the rare-earth oxide La2O3 powder accounts for 0.5-5 percent of the weight of the materials of the coating layer. Metallurgical combination is realized, so that the bonding strength of the coating layer is high, and organization is compact; therefore, compared with the common coating layer, the coating layer has the advantages that the abrasion resistance and the corrosion resistance are greatly improved. The coating layer disclosed by the invention is processed by a plasma composite spraying technology such as laser and atmosphere instead of an independent thermal spraying technology; in order to fulfill the aim of realizing coating layer metallurgical combination, due to the metallurgical combination, the coating layer combining strength can be improved, and the high compactness of the organization of the coating layer is realized; due to the high combining strength and the low porosity, the coating layer is long in service life and high in abrasion resistance and corrosion resistance.

The invention discloses a method for reinforcing a nickel-base alloy layer on an aluminum alloy surface, which comprises the following steps: doping rare earths La and Ce in a certain proportion into nickel-base alloy powder, and carrying out laser surface cladding to obtain a metallurgically-bonded high-hardness high-wear-resistance high-corrosion-resistance nickel-base alloy layer on the aluminum alloy surface. The hardness of the nickel-base alloy layer is up to 1350HV, and the wear resistance and corrosion resistance are respectively doubled as compared with the prior art. The invention has an important function on widening the application range of the aluminum alloy and expanding the application of the aluminum alloy in the high technology field.

The invention discloses a film for raising the abrasion resistance of a compressor slide plate and a preparation method thereof. The film provided by the invention is positioned on the surface of the slide plate matrix and has a multilayer structure, wherein the first layer, close to the surface of the slide plate matrix, is a linear ion source auxiliary depositional metal simple substance adhesive layer; the second layer is a metal simple substance transition layer; the third layer is a metal hard carbide transition layer; and the fourth layer is a diamond-like carbon layer. In comparison with the prior art, by the optimization design of the film structure on the surface of the slide plate matrix and the optimization of the preparation technology, the produced film provided by the invention has advantages of high hardness, low friction coefficient, high wear resistance and corrosion resistance, smooth surface, uniform thickness and high adhesion strength, and can be used to raise the abrasion resistance of the compressor slide plate so as to enable the slide plate matrix to be used in the environments of R410A or a higher-level novel refrigerant and a lubricant and prolong the service life of the slide plate matrix.

The invention provides a high-temperature metal hard seal ball valve for granular media. The high-temperature metal hard seal ball valve comprises a valve body, a ball body, a valve rod, a valve seat and a bottom cover, wherein the ball body is arranged in a cavity in the valve body, the valve rod connected with the ball body extends out of the valve body through a center through hole at the upper part of the valve body, the bottom cover is positioned at the bottom of the valve body and comprises a bottom cover baseplate and a bottom cover shaft, the bottom cover baseplate is movably connected with the valve body, the bottom cover shaft penetrates through a through hole at the lower part of the valve body and is connected with the ball body in the cavity of the valve body, the ball body and the valve seat are made of metal materials, the valve seat is mounted in the valve body and on the inner wall which is in contact with the ball body, a spring seat is arranged on the outer side of the valve seat, a disc spring is mounted in a groove between the spring seat and the valve seat, a pressure ring is arranged on the outer side of the spring seat, the pressure ring is fixedly mounted on the spring seat through a screw, a pendant collet for playing a sealing role is arranged in the contact position of the spring seat, the pressure ring and the valve body, an O ring is arranged in the groove between the valve seat and the valve body, and the O ring is made of fluorine rubber.

The invention discloses a high-strength molybdenum nickel boron ternary boride material and a preparation method thereof. The high-strength molybdenum nickel boron ternary boride material comprises the following elements by content percent: 3% to 6% of boron, 35% to 55% of molybdenum, 1% to 8% of chromium, 0.2% to 0.8% of carbon, 0.5% to 4% of vanadium, 1% to 4% of niobium, 0.5% to 5% of tungsten, 0.1% to 1% of cerium and 1% to 3% of manganese, and the balance being nickel. According to the preparation method provided by the invention, the manufacturing technology is simple, atomization powder forming replaces mechanical ball milling powder forming, segregation is reduced during follow-up forming, toughness of the material is improved, and a high-strength Mo2NiB2-based metal ceramic material with a dense structure is obtained through HIP hot isostatic pressure sintering. The high-strength molybdenum nickel boron ternary boride material provided by the invention is scientific and reasonable in formula design, has high melting point, high hardness and high abrasion resistance and corrosion resistance, can be utilized as a high-temperature resistant material, corrosion-resistant material, abrasion-resistant material and superhard material, and is good in comprehensive performance.

The invention discloses a rare earth and Ni based alloy powder material to improve the abrasion and corrosion resistances of the material and prolong the service lives of parts. The material comprises 1.0-1.4wt% of C, 3.0-3.6wt% of B, 3.8-4.0wt% of Si, 16.5-18.5wt% of Cr, 3.0-4.0wt% of Fe, 1.0-2.0wt% of Cu, 1.0-2.0wt% of Mo, 0.2-0.3wt% of Nb, 0.2-0.3wt% of Y, and the balance Ni.

The invention discloses a food processing pulverizer capable of controlling feeding quantity. The food processing pulverizer comprises a pulverizer body, wherein the outer wall of the pulverizer bodyis covered with a wear resistant layer; a feeding hopper is arranged on the upper side of the pulverizer body; sliding rails are arranged on the front and rear sides of the bottom end of the interiorof the feeding hopper; an adjusting plate is connected onto the sliding rails in a sliding manner; a cover plate is horizontally connected with the top end of the adjusting plate; an air cylinder is arranged at the right end of the upper side of the pulverizer body; the bottom end of the air cylinder is fixed on the upper surface of the pulverizer body through a fixing rack; and the left end of the air cylinder is connected with a telescopic rod. The food processing pulverizer can control the feeding quantity, so that blockage is avoided and the work load of the food processing pulverizer is also lowered; a crushing mechanism can crush raw material and can effectively prevent excessive feeding from damaging a rolling roller couple, so that the service life is prolonged; a grinding ball canfully grind material, so that the crushing effect is ensured; and a material pumping machine is adopted for discharging, so that discharging is complete and discharging blockage and dust pollution are avoided.

The invention discloses an organic silicon modified bi-component solvent-based polyurethane anti-corrosive coating and a preparation method thereof. The coating consists of a component A and a component B, wherein the component A is synthesized from the following raw materials in percentage by mass: 5-70 percent of organic silicon modified polyester polyol, 5-60 percent of pigment-filler, 10-50 percent of mixed solvent, 0-0.05 percent of catalyst, 1-5 percent of flatting agent, 0-0.2 percent of coupling agent, 0.3-0.5 percent of anti-settling agent, 0.1-0.5 percent of wetting dispersant, 0.2-1.4 percent anti-skinning agent and 0.2-0.5 percent of defoaming agent; and the component B is 5-50 percent of TDI-TMP addition product. The coating has the properties of high solid content, high adhesion, high temperature resistance, wear resistance, moisture and heat resistance, resistance to acid attack, hydrophobic property, normal temperature construction and the like, and is suitable for preventing corrosion of ordinary metal and concrete facilities, particularly for preventing corrosion of a desulfurated chimney inner wall of a power station, and overcomes the defects existing in the conventional anti-corrosive coating.

The invention discloses a ceramics particle strengthened composite material lining metal tube and a manufacturing method thereof, belonging to the field of composite wear-resistant tubes. 4,4-Diphenylmethane diisocyanate (MDI), polyester glycol, 1,4-butanediol (BD), ceramics particles and the like serve as raw materials to prepare composite material liquid castables, and a centrifugal casting technology is adopted to cast polyurethane base ceramics particle strengthened composite material lining layers on the inner wall of an outer thimble. The invention has the beneficial effect that the prepared ceramics particle strengthened composite material lining metal tube has excellent abrasive resistance and corrosion-resistance and greatly improves service life. The raw materials of the invention are easy to be obtained, manufacturing technology is simple, cost is low and economic benefit is obvious and practical application and mass production are beneficial for factories.

The invention discloses an iron-based cored wire including an amorphous phase abrasion-resistant and corrosion-resistant coating prepared by utilizing electric arc spraying and a preparation method for the coating, and belongs to the field of the thermal spraying in the material processing engineering. Steel band materials for manufacturing a wire casing are stainless steel bands, and the filling rate of the cored wire is from 32% to 34%. The cored wire comprises the following elements in percentage by atoms: 15 to 26 at.% of Cr, 4 to 14 at.% of P, 9 to 18 at.% of Si and 2 to 4 at.% of C. The preparation method for the coating comprises the steps as follows: pre-grinding a matrix surface by using 180 meshes of sand paper and carrying out a blasting treatment on the matrix surface by using 60 meshes of brown aluminium oxide, thereby obtain the cored wire; and preparing the coating by using the electric arc spraying process, wherein the voltage in the spraying process is from 25V to 34V, the current is from 180A to 220A, the spraying distance is from 190mm to 210mm, and the compressed air pressure is from 0.4 Mpa to 0.6 Mpa. The prepared amorphous phase coating has the characteristics high hardness, good abrasion-resistant and corrosion-resistant performance and excellent mechanical performance.

The invention provides a copper-tin-iron ternary alloy plating solution which comprises copper sulfonate, stannous sulfonate, ferrous sulfonate, alkyl sulfonic acid, an auxiliary complexing agent and a reducer. In the plating solution, the content of copper is 4-9 g/L, the content of tin is 2.5-4 g/L, the content of iron is 0.8-1 g/L, the content of the alkyl sulfonic acid is 150-300 ml/L, the content of the reducer is 0.1-0.3 g/L, and the content of the auxiliary complexing agent is 5-20 ml/L. On the premise of increasing the content of tin, element iron is introduced into the plating solution, thereby overcoming the defect of low protective properties of the copper-tin alloy; and the tin-iron alloy can produce coprecipitate by adding the auxiliary complexing agent. The coprecipitate formed by tin and iron can effectively enhance the abrasive resistance and corrosion resistance of the plating on the premise of ensuring the oxidation resistance of the plating.

The invention discloses a preparation method of particle-reinforced wearable porous titanium. The preparation method comprises the following steps of: S1, sufficiently and uniformly mixing the titanium powder and the wearable material particle; S2, adding a pore-forming agent to the powder mixture, and sufficiently and uniformly mixing; and S3, pressing and forming; S4, heating up the pressed powder blank in a heating furnace, removing the pore-forming agent, and placing in a vacuum sintering furnace for sintering to obtain the particle-reinforced wearable porous titanium. The preparation method of the particle-reinforced wearable porous titanium has the beneficial effects as follows: the process is simple, the device requirement is low, the processing cost is lowered and the operation is convenient; the porosity and the pore size can be controllable; the added pore-forming agent is low in cost, and the pore of the porous titanium can be controlled well; the added wearable hard particle has the characteristics of high melting point, high hardness, good antioxidant capacity, good lubricity and wear resistance and the like, so that the comprehensive performance of the porous titanium is improved well; the prepared porous titanium is uniform in pore distribution, good in wear and corrosion resistance, good in process controllability, simple and low in cost.

The invention relates to a preparation method for a coating on an electrolytic aluminum prebaked anode steel claw, which belongs to the technical field of metallurgical materials. The method comprises the following steps: removing dirt on the surface of the electrolytic aluminum prebaked anode steel claw through polishing, cleaning and drying the electrolytic aluminum prebaked anode steel claw and successively removing oil by using an oil removal agent and removing rust by using acid; subjecting the pretreated electrolytic aluminum prebaked anode steel claw to hot dip aluminum plating or fused salt electrolysis titanizing; and finally, carrying out micro-arc oxidation on the electrolytic aluminum prebaked anode steel claw treated by any method in a NaSiO3 solution, NaOH solution, NaH2PO4 solution or Na2SiO3 solution by using constant-current electrolysis so as to prepare the oxidation-resistant corrosion-resistant electrolytic aluminum prebaked anode steel claw treated by using a hot dip aluminum plating or fused salt electrolysis titanizing method and a micro-arc oxidation method. The preparation method provided by the invention overcomes the problems of high-temperature oxidation consumption of the anode steel claw and corrosion of electrolyte cryolite.

The invention discloses a high-temperature and high-pressure composite material slagging ball valve assembly which comprises a high-temperature wear-resisting O-shaped ball valve, a flange sealing gasket, a high-temperature wear-resisting V-shaped ball valve and a stud nut, wherein the high-temperature wear-resisting O-shaped ball valve and the high-temperature wear-resisting V-shaped ball valve are connected through the stud nut to form a combination valve, and the flange sealing gasket is further arranged between the high-temperature wear-resisting O-shaped ball valve and the high-temperature wear-resisting V-shaped ball valve; the high-temperature wear-resisting O-shaped ball valve is of a single-valve-seat structure, the valve body of the high-temperature wear-resisting O-shaped ball valve is of a half-splitting type central symmetry structure, the high-temperature wear-resisting O-shaped ball valve is mounted on the medium outlet side to serve as a sealing valve, and the high-temperature wear-resisting V-shaped ball valve is of a one-way sealing structure and is mounted on the medium inlet side to serve as a separation valve. The high-temperature and high-pressure composite material slagging ball valve assembly has the advantages of being good in wear resistance, good in sealing performance, long in service life and resistant to high temperature and high pressure.