The invention provides graphene/nanometer aluminum powder composite powder, a graphene/aluminum base composite material containing the composite powder and a preparation method thereof. The graphene/nanometer aluminum powder composite powder comprises nanoscale aluminum powder or aluminum alloy powder, graphene and a binding agent, wherein the particle size of the nanoscale aluminum powder or aluminum alloy powder is 50-100 nm; the graphene has the average layer number of 3-4 layers and the piece diameter of 100 nm-3 microns; the binding agent consists of epoxy resins and/or phenolic resins+epoxy thinners+ethanediamine and/or a NL curing agent; and the nanoscale aluminum powder or aluminum alloy powder is bonded with the graphene through the binding agent. The graphene-reinforced aluminum base composite material prepared by a high-pressure sintering method has such advantages as improvement of the material compactness, improvement of the interface combination and inhibition of the interface reaction.

Graphene/nanometer aluminum powder composite powder, graphene/aluminum base composite material containing composite powder and preparation method thereof

The invention discloses a casting method for a novel composite toothed plate of a high-power high-treatment capacity crushing machine, relates to the casting method for the novel composite toothed plate of the high-power high-treatment capacity crushing machine, and aims to solve the problems that under continuous strong-impact load action, a tooth top of the toothed plate is gradually ground to be convex, yield strength and impact toughness are gradually reduced, and fatigue strength gradually reaches the fatigue limit of materials, so that finally, the toothed plate loses efficacy, the service life of the toothed plate is short, crushing efficiency is low, and a product is unqualified. The casting method mainly comprises the steps of step (1) material mixing; step (2) mixing with epoxy resin; step (3) manufacturing of a sample piece; step (4) smearing for the sample piece; step (5) mold bonding; step (6) coating and drying; step (7) fixing for the sample piece; step (8) casting molding; step (9) cooling; and step (10) thermal treatment. The casting method is used for preparing a steel-based yttria zirconia and tungsten carbide particle composite.

Casting method for novel composite toothed plate of high-power high-treatment capacity crushing machine

The invention discloses a method for directionally doping metal with graphite. The method comprises the following steps that metal raw material powder and/or graphite powder plated with metal film are mixed and stacked into a sintering layer, and the graphite powder plated with the metal film is located at a preset position of the sintering layer at a preset ratio; under inert gas shielding, an oriented field is adopted to heat the sintering layer to be sintered; stacking the sintering layers repeatedly, and sintering is conducted layer by layer until material preparation is completed. By the adoption of the method for directionally doping the metal with the graphite, the metal powder and graphite powder plated with the metal film are incrementally superposed, the oriented field is adopted to enable the metal powder and the metal film of the graphite powder to be rapidly fused and sintered into a composite, the composite has high heat conducting performance, the strength of the compost is improved, and the demands for complicated shapes of a graphite-metal composite under different conditions are met.

Method for directionally doping metal with graphite

The invention discloses a process method of wear-resistant heat-resistant composite steel casting capable of improving wear resistance and heat resistance. The method comprises a composite material, wherein the composite material is prepared from raw materials B, an inorganic binder A and an organic binder B, and the raw materials B comprises dry quartz sand, magnesium-chromium spinel, magnesium-iron spinel, magnesium-aluminum spinel, marble sand, carborundum and the like. According to the method, a casting model is prepared from the composite material, so that a lost foam model is replaced, the problem that the lost foam model is damaged is effectively avoided, and therefore the integrity of the casting is improved; moreover, after the composite material is made into the casting model, the material is melted under the action of molten iron and is attached to the surface of the casting, the wear resistance of the surface of the casting is improved, and meanwhile, grinding and repairingare facilitated at the later stage; a wear-resistant mass point is added into the cast iron part, so that the wear resistance of the casting is improved; meanwhile, due to the fact that the molten iron is in contact with the sand mold, the cooling speed is high, so that white iron ferrugination is promoted, the hardness of a product is further improved; and meanwhile, the amount of molten iron isreduced, so that the production cost is reduced, and the use convenience is improved.

Process method of wear-resistant heat-resistant composite steel casting capable of improving wear resistance and heat resistance

The present invention provides a method for fabricating a low-cost, short-production-cycle wear-resistant steel; the composition of the wear-resistant steel, by mass percentage, is: C: 0.10-0.20%; Si: 0.20-0.30%; Mn: 1.10-1.50%; Cr: 0.15-0.25%; Mo: 0.10-0.30%; Nb: 0.01-0.02%; Ti: 0.01-0.03%; B: 0.0015-0.0020%; S: ≤0.0012%; P: ≤0.015%; O: ≤0.01%; N: ≤0.005%; the remainder is Fe. After the cast strand is hot-rolled, the steel plate is quenched at 920°C, then directly straightened with no need for thermal tempering; it is thus possible to obtain a steel plate having a lower residual stress value of NM 400, which is comparable to the residual stress value of a steel plate after using quenching, tempering, and straightening processes. The present invention uses quenching and direct straightening processes to produce a wear-resistant steel NM 400 plate; no intermediate tempering is required, thus reducing the process steps, decreasing cost, and shortening the production cycle.

Method for fabricating low-cost, short-production-cycle wear-resistant steel

The invention provides aluminum-coated graphite composite powder, an aluminum-graphite composite comprising the composite powder and a preparation method thereof. The aluminum-coated graphite composite powder comprises nanoscale aluminum powder or aluminum alloy powder, graphite and an adhesive, wherein the particle size of the nanoscale aluminum powder or aluminum alloy powder is 50-100nm; the particle size of the graphite is 20-70 microns; the graphite is a coated core; the adhesive is composed of epoxy resin and/or phenolic resin, diluted epoxy liquid, ethylenediamine and/or an NL curing agent; the nanoscale aluminum powder or aluminum alloy powder is coated on the surface of the graphite via the adhesive. Through the aluminum-coated graphite composite powder, the problems of the segregation of the graphite in the preparation process of the aluminum-graphite composite and the limitation of a process of chemically plating copper/nickel on the surface of the graphite can be solved.

Aluminum-coated graphite composite powder, aluminum-graphite composite comprising composite powder and preparation method thereof

The invention provides low-alloy abrasion-resistant steel and a heat treatment method thereof. The low-alloy abrasion-resistant steel comprises the following chemical components in percentage by mass: 0.28-0.30% of C, 0.6-0.8% of Si, 0.4-0.6% of Mn, 2.0-2.2% of Cr, 0.29-0.30% of Mo, 0.005-0.04% of Ti, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 0.018-0.02% of Zr, 0.008-0.01% of Al, 0.02-0.05% of Cu, 0.06-0.07% of Re and the balance of Fe and inevitable impurity elements. The low-alloy abrasion-resistant steel has high strength, high hardness, high toughness and excellent abrasion resistance and can be widely applied to mechanical products with requirements on high strength and high abrasion resistance in engineering, mining, building, cement production, ports, electronics and metallurgy.

Low-alloy abrasion-resistant steel and heat treatment method thereof

The invention provides a preparation method for a wear-resisting part. The wear-resisting part is composed of a base body and a wear-resisting layer attached on the base body. The method comprises the steps that firstly, a prefabricated block of which the shape is corresponding to the shape of the wear-resisting layer is prepared; secondly, a white die is used to fabricate the shape of the base body; and thirdly, and expendable pattern casting is conducted. The wear-resisting part fabricated with the method provided by the invention has the advantages that the raw material cost of the wear-resisting layer is low; and the fabricated wear-resisting layer has high hardness, high wear resistance and a long service life, and is applicable to very wicked working conditions.

Preparation method for wear-resisting part

The invention provides structural steel with the yield strength being over 630 MPa for buildings. The structural steel is prepared from, by mass, 0.07%-0.12% of C, 0.1%-0.25% of Si, 1.3%-1.6% of Mn, 0%-0.015% of P, 0%-0.010% of S, 0.04%-0.06% of V, 0.02%-0.04% of Nb, 0.015%-0.03% of Ti, 0.4%-0.6% of Cr, 0.001%-0.003% of B and the balance Fe and inevitable impurity elements. The structural steel can bear large loads, the roughness and plasticity of the structural steel are well matched, the requirement for overload resistance of the structural steel for the buildings is met, the fluctuation of the yield strength of the structural steel is small, the load and deformation between steel structures are even, the overall plastic deformation capacity of the structural steel is improved, and the anti-seismic safety can be improved easily.

Structural steel with yield strength being over 630 MPa for buildings and preparing method of structural steel

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Papers

Aluminum-coated graphite composite powder, aluminum-graphite composite comprising composite powder and preparation method thereof

Low-alloy abrasion-resistant steel and heat treatment method thereof

Preparation method for wear-resisting part

Structural steel with yield strength being over 630 MPa for buildings and preparing method of structural steel