83results about How to "Improved erosion and wear resistance" patented technology

The invention relates to a preparation method of aluminum oxide metal ceramic reinforced iron-based composite, namely, aluminum-oxide-based metal ceramic is used as a structural framework and one of effective components to prepare metal ceramic iron-based composite, which is consistent in structure, even in metal phase distribution, high in mechanical performance, and high in wear resistance, under certain pressure by melt casting and further processing. The preparation method includes the steps of firstly, preparing aluminum oxide metal ceramic framework base pretreated by activated Si into surface-modified prefabricated ceramic part with a silk-screen-shaped pore structure by high-temperature sintering; secondly, preparing a pouring sand module; thirdly, placing the pouring sand module into a casting sand box for pretreating, pouring, vacuumizing, and allowing iron-based molten metal to fully permeate into pores of the prefabricated ceramic part to form a rigid integrity; and fourthly, performing heat treatment and air cooling to obtain the iron-based composite with closely combined aluminum oxide metal ceramic and iron base.

The invention provides a temperature-resistant wear-resistant coating and a preparation method thereof, belongs to the technical field of two-component epoxy adhesives, and mainly solves the problems of poor temperature resistance and wear resistance of coatings in the prior art. The temperature-resistant wear-resistant coating is mainly composed of A and B two components, the component A comprises the following components: 10%-30% of epoxy resin, 5%-30% of modified epoxy resin, 3%-10% of a diluent, 10%-30% of silicon carbide, 1%-5% of fumed silica and 40%-70% of a high alumina ball; the component B comprises the following components: 20%-30% of a curing agent, 0%-3% of a promoter, 1%-5% of a silane coupling agent, 10%-30% of the silicon carbide, 1%-5% of the fumed silica and 40%-60% of the high alumina ball; the weight ratio of component A to component B is 4:1. The temperature-resistant wear-resistant coating has the advantages of good erosion wear resistance, simple coating process and low cost, is mainly used on the surface of a workpiece working in slurry erosion wear working conditions, and is also used in corrosion and wear surface repair.

An anticorrosion composite nano-paint contains film forming agent, dispersing liquid, antisticking agent and SiO2 colloid, where the granularity of SiO2 is 10-20 nm. Its coated layer is characterized by high hardness, adhesion and toughness, and excellent corrosion and abrasion resistance.

The invention discloses a method for preparing a Ni-based alloy-TiB2 nano coating. Powder is sprayed on a base material through supersonic speed flame so as to form a nano-structured coating, wherein the powder comprises two components, namely, 60-80 percent by weight of Ni-based alloy powder, and 20-40 percent by weight of TiB2. The nano coating prepared according to the technical scheme is dense in tissue and uniform in distribution, is of a certain flat layered distribution structure, and is not clear in boundary distribution amount spraying ions. In addition, the prepared nano coating further contains special or elliptical unmelted or semi-melted grains, and due to such a structure, the prepared nano coating has higher bonding strength and better abrasion resistance. Therefore, the comprehensive application property of the protection coating is improved, and the high-temperature corrosion resistance and the erosive wear resistance of 'four tubes' of a boiler are further improved.

The invention discloses cobalt-based alloy powder for laser remanufacturing of the housing of a rolling mill, which is characterized by comprising the following components in percentage by mass: 0.8 to 1.4 percent of C, 26 to 32 percent of Cr, 3 to 6 percent of W, 0.6 to 1.4 percent of Mo, 1.2 to 1.8 percent of Ni, 0.2 to 0.6 percent of Mn, 0.8 to 2.4 percent of Si, 1.2 to 4.8 percent of Fe, 0.4 to 1.6 percent of B, 0.2 to 0.6 percent of Ce, 0.2 to 0.6 percent of Hf and the balance of Co. The cobalt-based alloy powder is suitable for the laser deposition of large-area ineffective working face of the housing of the rolling mill, and by depositing the alloy powder, the housing of the rolling mill can be reused and the oxidization resistance, corrosion resistance and washing corrosion resistance of the housing of the rolling mill are improved. The online repair problem of the housing of the rolling mill is solved effectively.

The invention relates to surface engineering technique in technical fields such as design materials, electrical power, metallurgy, machine and the like, in particular to a method for preparing metallic matrix composite coating reinforced by tungsten carbide ceramics particles. The metallic matrix composite coating reinforced with tungsten carbide ceramics particles (WCP/NiCrBSi) is prepared on the surface of mild steel base material based on the characteristics of high hardness, wear resistance, erosion resistance of the tungsten carbide ceramics material and fine self-fluxing nature, wettability and plasma spraying technology of the NiCrBSi alloy, and the property of wear and tarnish resistance is improved. The technique process of preparing WCP/NiCrBSi composite material coating is as follows: coating design; sifting dusty spray; mixing the powder according to certain ratio; superficial treatment of base material; controlling plasma spraying parameter; preparing WCP/NiCrBSi coating.

The present invention relates to a method for producing abrasive grains. According to the invention the method is characterised by the steps of manufacturing a polycrystalline body comprising diamond particles in a matrix of silicone carbide and silicon, and crushing the polycrystalline body into grains. The invention also relates to abrasive grains produced by the method.

This invention relates to a surface engineering field used in the protection of power station boiler pipelines including: spot welding a layer of hardness alloy lattice on a cleaned metal matrix with self-protection metal core weld sticks, in which, the weld current is 180-220A, voltqge is 18-22V, welding point space is 2-5mm, diameter of the welding point is 4-5mm and the height is 2-3mm, the welded metal matrix is sprayed with sand to eliminate the oxidized skins, rust and the old coating and expose the metallic brightness then a compound layer of anti-erosion and anti-abrasion is sprayed on the matrix by an arc spraying method.

The invention relates to a preparation method of a magnetic boron nitride nanosheet/polyurethane composite material, in particular to a preparation method of magnetic boron nitride nanosheet/polyurethane composite material having an ordered surface microstructure. The invention aims to provide the preparation method of the magnetic boron nitride nanosheet/polyurethane composite material having the ordered surface microstructure. The preparation method includes: 1, preparing intercalation boron nitride; 2, preparing boron nitride nanosheets; 3, preparing boron nitride nanosheets, to the surface of each which ferroferric oxide magnetic nanoparticles are carried; and 4, preparing the magnetic boron nitride nanosheet/polyurethane composite material having the ordered surface microstructure. The ordered composite material has excellent erosion wear resistance; compared with disorder boron nitride/polyurethane composite materials and pure polyurethane, the magnetic boron nitride nanosheet/polyurethane composite material has erosion wear resistance increased by 31.9% and 51.5%, respectively and is applicable to anti-erosion protective coatings. The magnetic boron nitride nanosheet/polyurethane composite material is applicable to processing and application of nanomaterials.

The invention discloses a preparation method of a hard particle reinforced impact-resistant and wear-resistant coating for machine-made sand, which comprises the following steps: firstly, preparing nano Al2O3 powder and pure Ni coated TiC powder, mixing NiCrBSi self-fluxing alloy powder, the nano Al2O3 powder and the pure Ni coated TiC powder through a plurality of additives to form mixed slurry, and then carrying out spray-drying granulation on the mixed slurry to obtain spherical granulated powder with the particle size of 30-120 [mu] m; and finally, coating the surface of a high manganese steel substrate with the granulated powder through a plasma spraying and laser remelting synchronous technology to form a wear-resistant coating through deposition, wherein pure Ni coated TiC is added into the NiCrBSi coating so as to enhance the erosive wear resistance of the coating. The nano Al2O3 is uniformly distributed on the whole of the coating by the method, so that the coating has higher hardness and better toughness at the same time; and the coating is prepared by the plasma spraying and laser remelting synchronous technology, so that the bonding strength between the coating and the substrate is relatively high.

The invention relates to a method for manufacturing ceramic-based composite burners for the field of coal chemical industry. The method includes: (1) design and machining of core moulds of ceramic burners; (2) structural design and shaping of prefabricated products of the ceramic burners; (3) preparation of interface layers of the prefabricated products of the ceramic burners; (4) densification of matrixes of the ceramic burners; (5) machining of the ceramic burners; (6) treatment of surface wear-resistant coatings of the ceramic burners. The method for manufacturing the ceramic-based composite burners for coal water slurry has the advantages of simple technical process, low cost and high rate of finished products. The burners manufactured according to the method have excellent erosion and abrasion resistance performance and are high in hardness, resistant to high temperature and high in toughness, and service lives of the burners are prolonged effectively.

The invention relates to special cobalt-based wear-resistant alloy powder for laser remanufacture of a drilling jar. The powder is characterized by comprising the following components in percentage by weight: 0.6-1.0% of C, 32-36% of Cr, 7.5-9.5% of W, 3.0-3.6% of Mo, 0.8-1.2% of Ni, 0.2-0.6% of Mn, 2.0-2.4% of Si, 1.2-2.0% of Fe, 1.6-2.2% of B, 0.1-0.2% of Ce, 0.25-0.4% of Hf, 0.06-0.1% of Zr and the balance of Co. The cobalt-based wear-resistant alloy powder provided by the present invention is exclusively used in laser-cladding large-area failure working surfaces of the shaft journal of the drilling jar; and by cladding the alloy powder material, the drilling jar is restored to use, and the oxidation resistance, corrosion resistance and erosion and wear resistance are improved, thus effectively solving the difficulty in the repair of the failure shaft journal of the drilling jar.

The invention belongs to the technical field of nozzles, and in particular relates to a method for preparing a laminated ceramic nozzle based on a stress wave theory. The method is characterized in that the inlet of the nozzle comprises 9 layers of a laminated material, and the outlet of the nozzle comprises 7 layers of the laminated material. The laminated material comprises boron carbide, titanium carbide, aluminum oxide and yttrium oxide as raw materials, the mass of each the laminated material layer is calculated according to the mixed theoretic density and the thickness of the laminated material layer and the inner diameter and the outer diameter of the nozzle, the laminated material layers are spread in a graphite mould according to the laminating sequence and the number of the layers, the laminated material layers are prepressed layer by layer, and put into a vacuum sintering furnace, temperature is 1850-1900DEG C, pressure is 30-35MPa, and heat insulation time is 40-60min. Through the establishment of a mathematical model of the stress wave propagation theory, material parameters for reducing abrasive material impact can be selected, the anti erosion performance of the ceramic nozzle is improved, due to thermal expansion coefficient difference between the laminated layer at the inlet and the laminated layer at the outlet, residual compressive stress is formed at the outlet and the inlet of the nozzle after hot pressed sintering, and tensile stress of the nozzle during blasting process can be alleviated, so that the laminated ceramic nozzle prepared by the method hasgood erosive wear resistance and wear resistance, and the service life is greatly improved.

The invention relates to a radial gradient ceramic sandblast nozzle prepared by hot-pressing sintering process with SiC as matrix and (W, Ti)C solid solution as hardening constituent, which belongs to the field of advanced production technology. The radial gradient ceramic sandblast nozzle is multilayer structure, and the components change gradually along nozzle radial direction, that is: the content of (W, Ti)C solid solution increases gradually from the inner hole surface of sandblast nozzle to the external wall of sandblast nozzle. Because the radial gradient change of components in ceramic sandblast nozzle, residual compressive stress forms on the surface of inner hole, so that the stress on the surface of the inner hole is relieved, erosion-proof and wearable performance is improved, and service life is prolonged.

The invention relates to a preparation method of a titanium silicon carbide ceramic nozzle. The preparation method comprises the following steps: optimizing raw materials of the titanium silicon carbide ceramic nozzle; using titanium silicon carbide powder and corundum as main raw materials; using Al-Ti alloy powder, phenolic resin, carbon tetraboride and silicon carbide as auxiliary materials. Meanwhile, in the process of preparation, large and small milling balls are used for mixed ball-milling; the suction filtration molding and a pre-boiling water quenching process are adopted to improve physical and chemical properties of prepared products; the prepared ceramic nozzle has good thermal stability, high compressive capacity, high corrosion resistance and difficult cracking.

The invention discloses an integrated wear-resistant composite ceramic coal water slurry nozzle. The integrated wear-resistant composite ceramic coal water slurry nozzle is made from following ingredients, by weight, 95 to 99 portions of Al2O3, 6 to 8 portions of TiC, 1 to 2 portions of WO3, 4 to 8 portions of a sintering aid, 0.1 to 0.2 portion of BeO, and 90 to 110 portion of absolute ethyl alcohol. A preparation method of the integrated wear-resistant composite ceramic coal water slurry nozzle comprises steps such as ball milling of raw materials, smashing and sieving, pressure forming, hot pressed sintering, and post processing. Formula of the integrated wear-resistant composite ceramic coal water slurry nozzle is reasonable; technology is advanced; erosive wear resistance of the ceramic coal water slurry nozzle is increased to more than 31 times larger than that of metal nozzles, and to more than 3 times larger than that of hard alloy nozzles; and thermal shock resistance of ceramic is improved. The integrated wear-resistant composite ceramic coal water slurry nozzle is capable of meeting with requirements of actual production preferably, service life of the integrated wear-resistant composite ceramic coal water slurry nozzle is longer than that of the metal nozzles and the hard alloy nozzles, and economic benefits of the integrated wear-resistant composite ceramic coal water slurry nozzle are higher than that of the metal nozzles and the hard alloy nozzles.

The invention aims to provide an epoxy resin coating layer having wear resistance and a preparation method thereof, wherein the wear-resistant epoxy resin coating layer is composed of a component A and a component B. The component A is composed of the following components in parts by weight: 30-60 parts of modified bisphenol A epoxy resin, 10-20 parts of an active diluent, 1-5 parts of nano alumina, 1-5 parts of nano titanium dioxide, 10-20 parts of silicon carbide and 0.5-1 part of a silane coupling agent; the component B is composed of the following components in parts by weight: 10-20 partsof a polyether amine curing agent, 5-10 parts of a polyamide curing agent, and 0.5-1 part of a curing accelerator.

The invention discloses a freezing-tolerant crack-resistant coating for exhaust equipment. The coating is made from the following raw materials: coal ash, an organosilicon-modified acrylic resin, toluene diisocyanate, zinc oxide, butyl cellulose, butyl acetate, an antifoaming agent BYK535, polyurethane, aluminium powder, silicon carbide powder, styrene, azodiisobutyronitrile, waterborne polyurethane, glycol, sodium dodecyl sulfate, a silane coupling agent a171, nanometer silica, a zirconia sol and a proper amount of absolute ethanol. The coating has preferable fouling resistance, alkali resistance, aging resistance and washing resistance, and has excellent freezing tolerance and crack resistance, and therefore can be used in the low-temperature environment. The equipment is protected, the service life of the equipment is prolonged, and thus the coating has high practical value.

The invention discloses a preparation method of an epoxy resin wear-resistant composite material, wherein the preparation method comprises the following steps: (1) raw material pretreatment: a, respectively carrying out clear water cleaning and acetone solution ultrasonic cleaning on SiC particles, and finally drying; b, drying a stirrer and a mold, so as to prevent water from being brought in; (2) stirring and mixing: uniformly stirring E44 type epoxy resin and E51 type epoxy resin, adding a toughening agent, a coupling agent and an organic silicon oil defoaming agent, and adding the pretreated SiC particles while stirring; and (3) curing molding: adding a curing agent and a curing accelerator while stirring, injecting into a mold coated with a release agent, curing at normal temperature,curing in an oven, and curing at room temperature to finally obtain the finished product. The preparation operation is simple, the materials are easy to obtain, the reaction conditions are easy to achieve, and the prepared epoxy resin wear-resistant composite material has excellent erosive wear resistance, corrosion resistance and good tensile strength.

The invention discloses a nano-carbon-containing refractory castable for a desulfurization stirrer. The castable comprises raw materials with the particle size being 1 mm or above, raw materials withthe particle size being larger than or equal to 0.1 mm and smaller than 0.1 mm and raw materials with the particle size being smaller than 0.1 mm. The raw materials with the particle size being smaller than 0.1 mm are prepared from pure fused mullite with the particle size being 325 mesh and dense corundum fine powder with the particle size being 325 mesh. The 325-mesh pure fused mullite and the 325-mesh dense corundum fine powder are carbon film nano-coated pure fused mullite and carbon film nano-coated dense corundum fine powder respectively. The invention also discloses a preparation methodof the castable. According to the castable disclosed by the invention, the thermal shock stability and the slag and molten iron erosion penetration resistance of the castable are improved, so that the castable is good in comprehensive performance and low in raw material cost, and a prepared stirrer is long in service life and low in consumption cost.