43results about How to "Improve softening resistance" patented technology

The invention discloses a production method of a high-strength, high-conductivity and heat-resistant copper alloy, and belongs to the technical field of copper alloy machining. Accoding to the production method of high-strength, high-conductivity and heat-resistant copper alloy, the inner liner of a crystallizer adopted in the upper-induced continuous casting process is a carbon-carbon composite material so as to ensure the lubrication, high heat conduction and high temperature resistance properties; the temperature of the upper-induced continuous casting is 1180-1230 DEG C, the casting temperature is low so that the problem that molten liquid in the crystallizer is difficult to solidify and the crystallizer inner liner is worn during casting can be effectively avoided; the pressure of protective gas nitrogen in the liquid surface of an upper-induced furnace is controlled to be 0.2-0.7 atmosphere, so that the phenomenon of solid-liquid interface separation in the crystallizer is avoided, and a copper-chromium alloy product with larger weight and length is produced; according to the production method of the high-strength, high-conductivity and heat-resistant copper alloy, the cheapelement (Mg) is used for replacing the rare noble metal, and the mechanical property and the softening resistance property of the copper-chromium alloy are improved; and the production method is a non-vacuum and short-process preparation technology, the cost is low, and the production method is suitable for large-scale industrial production and has important economic and social significances.

The invention provides a low-carbon high-chromium abrasion-resistant ball and a preparation technique thereof. The low-carbon high-chromium abrasion-resistant ball is prepared from, by mass, 2.35%-2.46% of carbon, 0.85%-1.12% of silicon, 0.45%-0.6% of manganese, 18%-22% of chromium, 0.2%-0.25% of aluminum, 0.1%-0.18% of titanium, 0.05%-0.1% of tantalum, 0.1%-0.12% of boron, 0.02%-0.04% of niobium, 0.01%-0.03% of zirconium, 0.01%-0.025% of sulfur, 0.01%-0.025% of phosphorus, 0.2%-0.24% of nitrogen, and the balance ferrum and inevitable impurities. The low-carbon high-chromium abrasion-resistant ball is prepared through the steps of smelting, pouring, quenching, tempering and the like, the content of the carbon element is decreased, and nitrogen is introduced in the smelting process, so that the abrasion resistance of the ball is improved through formed metal nitride; and meanwhile, the situation that the hardenability is reduced due to excessive carbide is avoided. The quenched HRC of the low-carbon high-chromium abrasion-resistant ball is equal to or higher than 65, the impact fatigue life of the low-carbon high-chromium abrasion-resistant ball is equal to or longer than 19600 times, and the breakage rate of the low-carbon high-chromium abrasion-resistant ball is equal to or lower than 2.5%.

The invention discloses a copper alloy for a steam turbine generator rotor and its processing technology. The copper alloy is composed of copper, nickel, silicon, chromium, silver, magnesium, niobium, etc., and is smelted→continuously extruded→cold deformed→solid solution Quenching→second cold deformation→cryogenic treatment→aging and other processing processes; the technical solution provided by the invention has excellent material properties and fully meets the requirements of the turbine generator rotor.

The invention discloses a high-chromium-copper alloy material and a preparation method thereof and belongs to the technical field of metal alloy materials. The high-chromium-copper material alloy comprises, by mass, 20%-50% of Cr, 0.1%-1.0% of CeO2 and the balance Cu and inevitable impurities. The high-chromium-copper alloy material has high strength and high conductivity and meanwhile has high fusion welding resistance and arc erosion resistance. According to the performance indexes of the material, the hardness HV is 155-175, the conductivity is 30%-65% IACS, the softening temperature is 550-575 DEG C, the oxygen content is 450-550 ppm, the fusion welding force is smaller than or equal to 1.7*10-2 MPa under the direct-current load experiment conditions of 40V and 40A, and the contact resistance per unit area is smaller than or equal to 38.2 omega/m<2>. The requirements for high strength, fusion welding resistance and electric erosion resistance of a contact material in the vacuum switching industry can be met. Besides, the preparation process is simple, production efficiency is high, and cost is low.

The invention discloses a slot wedge material for a steam turbine generator rotor and its processing technology. The copper alloy is composed of copper, nickel, silicon, chromium, zirconium, silver, magnesium, niobium, etc., and is vacuum smelted → water-sealed extrusion → Cold deformation→aging→solution quenching→second cold deformation→cryogenic treatment→second aging and other processing processes; the technical solution provided by the invention, the obtained material has excellent performance and fully meets the use requirements of the turbine generator rotor .

The invention relates to a copper alloy band used on an auto radiator. The copper alloy band comprises the following chemical constituents by weight: more than or equal to 99.7% of copper, 0.05 to 0.20% of tin; 0.005 to 0.05% of antimony, 0.005 to 0.05% of indium; o to 0.0005% of oxygen, wherein the total content of copper, tin, antimony and indium is more than or equal to 99.99%; the total content of other impurities is smaller than 0.01%. The copper alloy band has the advantages that the components are reasonably optimized, the performance index is excellent, the electrical conductivity is larger than 85% IACS, the anti-softening temperature is higher than 390 DEG C, the tensile strength is 380-450 MPa, and the Vickers hardness is larger than 120. Therefore, the copper alloy band can completely meet the performance indexes required by the auto radiator.

The invention discloses a high-temperature anhydrous gypsum pavement brick and kerb and a preparation method thereof, belongs to the technical field of road engineering, and aims to break through theshackle that gypsum products cannot be applied in an outdoor humid environment so as to increase the consumption way of industrial byproduct gypsum. Positive protection and absorption promotion effects can be achieved on natural environment protection, natural resource and hazardous waste recycling, civil cost reduction and the like. The high-temperature anhydrous gypsum pavement brick and kerb, provided by the invention, comprise high-temperature anhydrous gypsum, an admixture, an initiator, water, fibers and an additive. The preparation method of the high-temperature anhydrous gypsum pavement brick and kerb comprises the following steps: uniformly stirring the high-temperature gypsum, the admixture and the fibers at a low speed, adding the water, the additive and the initiator solution for high-speed stirring, finally pouring, molding, demolding and laminating for moisturizing maintenance, and finally obtaining the pavement brick and kerb made of the high-temperature anhydrous gypsummaterial with various indexes such as durability, strength, water resistance, wear resistance, softening resistance and the like reaching the national standard.

The invention discloses a high-strength waterproof composite light partition board. The high-strength waterproof composite light partition board comprises the following materials by weight: 95-70 Kg of high-temperature gypsum, 5-30 Kg of a modified material, 1-2 Kg of a water reducing agent, 30-40 Kg of water, 0.1-0.3 Kg of fibers and 0.1-0.3 Kg of a retarder. The high-temperature gypsum is anhydrous gypsum prepared by heating dihydrate gypsum at high temperature to lose water; the modified material comprises cement, ground slag powder, silicon powder and ground steel slag; the water reducing agent is a water reducing agent for concrete; the fibers comprise artificial fibers and natural fibers; the retarder comprises citric acid, borax and melamine; and the water meets the standard requirements of concrete mixing water. With the high-strength waterproof composite light partition board and the preparation method thereof of the invention adopted, the defects of low strength, poor water resistance, small single nail hanging force and poor single nail bond stress of gypsum composite light partition boards can be solved; the consumption ways of industrial byproduct gypsum are increased. The high-strength waterproof composite light partition board and the preparation method play a positive role in protecting the natural environment, natural resources, recycling hazardous wastes, reducing the livelihood cost and the like and promoting absorption.

The invention discloses a copper alloy with excellent hot rolling performance and a manufacturing method thereof, the copper alloy comprises the following components in percentage by weight: 0.6-1.0 wt% of Ni, 1.0-2.0 wt% of Sn, 0.01-0.03 wt% of Mg, 0.06-0.10 wt% of P, less than or equal to 0.0010 wt% of O, and the balance of Cu, and inevitable impurity alloy, oxygen-free copper is used as a matrix, the oxygen content is controlled to be less than or equal to 0.0010 wt%, the trace element Mg is added, the alloy has excellent hot workability, in the process of melting casting and hot rolling, the ingot has no cracking phenomenon and has excellent hot workability, the yield strength Rp of the alloy is larger than or equal to 520 Mpa, the ductility A11.3 is larger than or equal to 6%, the electric conductivity is larger than or equal to 38% IACS, the bending machining performance (GW and BW directions) R/t is smaller than or equal to 1, the stress residual rate is larger than or equal to 85% after heat preservation is conducted for 1000 hours at the temperature of 150 DEG C, and a plate strip processed by the alloy is widely applied to connectors, terminals or switch parts of electrical, automobile and communication devices and the like.