107results about How to "The composition is uniform and stable" patented technology

The invention discloses a preparation method for a silver tin oxide electrical contact material, which comprises the following steps: by taking a silver ingot, a tin ingot, an indium ingot and an additive ingot as raw materials, atomizing the raw materials to prepare a silver tin alloy powder; ingoting, sintering, extruding and drawing/rolling the silver tin alloy powder to prepare a wire material or a sheet plate or a belt material; and finally, carrying out internal oxidation to prepare the silver tin oxide electrical contact material. The preparation method for the silver tin oxide electrical contact material has the characteristics of uniform and stable contact material components, no conventional internally oxidized central lean oxidation zone, high density, high hardness and the like. The preparation method for the silver tin oxide electrical contact material has a simple process and is suitable for mass production. A prepared silver tin oxide product can be widely used for relays and contactors.

The invention discloses an alloy ingot for an automotive hub and a production method thereof. The alloy ingot comprises the following components: 6.8-7.2% of Si, 0.28-033% of Mg, 0.10-0.15% of Ti, 0.015-0.030% of Sr, less than or equal to 0.10% of Fe, less than or equal to 0.05% of Mn, less than 0.01% of zinc, less than 0.01% of Cu, less than 0.003% of Ca, less than 0.002% of P, less than 0.02% of other single impurity content, less than 0.1% of total impurity content and the balance of aluminum. The production method of the alloy ingot for the automotive hub comprises the following steps of: adding 3303 industrial metallic silicon and electrolytic aluminum liquid for batching, heating at an appropriate temperature and melting, spreading a covering agent so as to reduce oxidation slagging, stirring so that the industrial metallic silicon rapidly melts, keeping uniform temperature, slagging off, keeping melt clean, spraying powder and refining by adopting high-purity N2 and a refined powder spraying agent, controlling the temperature of a smelting furnace to 740-750 DEG C, adding Al-Sr alloy to aluminium water, carrying out secondary degassing and slagging-off by adopting a powder spraying refinement method, filtering to remove slag, and casting the alloy ingot in line with requirements. The alloy ingot obtained by the method has the advantages of stable and uniform components, compact structure and clean surface; and the production method is the best production method for producing the A356.2 alloy ingot for the low-iron high-end automotive hub.

The invention belongs to the technical field of die steel and particularly relates to H13 die steel and a production method of the H13 die steel. The H13 die steel comprises chemical components including, by weight, 0.32%-0.45% of C, 0.80%-1.20% of Si, 0.20%-0.50% of Mn, 4.75%-5.50% of Cr, 1.10%-1.75 of Mo, 0.80%-1.20 of V, not larger than 0.25% of Cu, not larger than 0.25% of Ni, larger than andequal to the sum of 2.726 C and 0.183 Si and smaller than or equal to the sum of 3.283 C and 0.179 Si of the sum of Mo, Nb and Ti and the balance Fe and inevitable impurities. By the adoption of the H13 die steel and the production method, the content of harmful elements in the steel is strictly controlled, the content of inclusions in the steel is reduced through a reasonable refining process, and it is ensured that the die steel has good cleanliness; with large compression ratio rolling, the compression ratio is larger than or equal to 15, and the internal structure of an H13 rolled materialis dense; and the transverse and longitudinal unnotched impact of the steel are both larger than or equal to 280 J, and the ratio of the transverse unnotched impact energy to the longitudinal unnotched impact energy is larger than 0.8.

The invention discloses a preparation method of a rare earth-iron intermediate alloy for low-oxygen rare earth steel. The preparation method of the rare earth-iron intermediate alloy for the low-oxygen rare earth steel comprises the steps that a vacuum smelting furnace is adopted, and rare earth metal and pure iron are placed in a crucible of the vacuum furnace at the mass ratio of 1-5:5-9; vacuumizing is conducted on the vacuum furnace until the pressure of the vacuum furnace is below 20 Pa, inert gas is fed for shielding, and the process of high-temperature melting-refining and electromagnetic stirring alloying is executed, wherein the high-temperature melting temperature is 1000-1500 DEG C, the temperature of the refining process is 1400-1500 DEG C, and the time is 5-15 minutes; molten metal is poured into an ingot mold, and then the rare earth-iron intermediate alloy is obtained. By the adoption of the preparation method of the rare earth-iron intermediate alloy for the low-oxygen rare earth steel, the rare earth yield can be significantly improved, the content of the rare earth in the steel can be accurately controlled, the adding cost of the rare earth is reduced, and the plasticity, the low-temperature impact toughness, the thickness-direction property and the corrosion resistance of the steel are improved.

The invention discloses a preparation method of a rare earth ferroalloy. The preparation method of the rare earth ferroalloy comprises the steps that a rare earth iron immediate alloy is prepared by non-self-consuming cathode electrolysis; an electrolyte is loaded in an electrolytic cell, a graphite carbon plate is used as an anode, a tungsten or molybdenum material is used as an cathode, and a crucible under the tungsten and molybdenum cathode is used as a receiver; in an electrolyte system of rare earth fluoride and lithium fluoride molten salt, rare earth oxide and iron are used as raw materials, then a direct current is passed for electrolysis, and the rare earth iron immediate alloy is obtained in the receiver; and the rare earth iron immediate alloy and iron are put into the crucibleas the raw materials, and the rare earth iron immediate alloy is further smelted by a melting and mixing method in a medium frequency induction furnace to obtain the rare earth ferroalloy. The rare earth ferroalloy obtained by the preparation method has uniform and stable composition, low impurity element content and close density and melting point to the density and melting point of steel, and the rare earth ferroalloy is easy to be added to the steel; and the rare earth ferroalloy can fundamentally solve the problem of effective addition of rare earth in the steel and can accurately controlthe content of the rare earth in the steel.

The invention discloses a method for preparing MnZn ferrite material powder from acid washing waste liquid and galvanized zinc slag. The method comprises the following steps of: (1) placing the galvanized zinc slag into the acid washing waste liquid to dissolve to obtain mixed solution; (2) adjusting the pH value of the mixed solution to 3 to 6 by using ammonia water, adding fluoride and reacting to obtain reaction solution; (3) adding a flocculating agent into the reaction solution and filtering out precipitate in the mixed solution by a suction filtration method, wherein the filtrate is primary solution; (4) preparing precipitate solution from the primary solution and manganese chloride according to the mole ratio of Fe2O3 to MnO to ZnO of the ferrite components and preparing precipitator solution from ammonium bicarbonate and ammonia water; (5) allowing the precipitate solution and the precipitator solution to enter a reaction kettle to react to obtain slurry; (6) ageing the slurry obtained from the complete reaction; and (7) oxidizing, washing, filtering and drying the aged slurry to obtain MnZn ferrite material powder. The soft magnetic MnZn ferrite material powder has fine granularity, uniform and stable components and high magnetic property.

The invention relates to a device for preparing an alloy mast through electromagnetic stirring and melting, wherein the alloy is made from chromium, zirconium and copper. A baffle is arranged in the middle part of a furnace body to divide the furnace body into a melting furnace part and a holding furnace part; the furnace bottom of the melting furnace part is higher than that of the holding furnace part; an electromagnetic stirrer is arranged on the outer side of the melting furnace part, and a melting furnace sensor is arranged at the lower part of the melting furnace part; and a holding furnace sensor is arranged at the lower part of the holding furnace part, and an up-pulling system is arranged above the holding furnace part. Under a non-vacuum condition, the device can realize continuous preparation of the alloy (containing chromium, zirconium and copper) mast which is easily oxidized and difficult in adding element zirconium; the manufacturing technology for the alloy mast is greatly simplified, a product with uniform and stable components can be acquired, the production cost can be reduced, and the device is worthy of promotion.

Through the process of composite HA+ZrO2+Y2O3 target material preparation, activation of the Ti2Al4V substrate, setting the composite HA+ZrO2+Y2O3 target and the Ti2Al4V substrate separately in main sputtering chamber and the sample chamber, sputtering under reasonably controlled magnetically controlled sputtering parameters, taking out sample and post-treatment in the sample chamber to obtain the artificial bone implant with composite biological film of composite HA+ZrO2+Y2O3 on the Ti2Al4V substrate. Compared with available prepared technology, the present invention has the advantages of high attachment strength of the composite biological HA+ZrO2+Y2O3 film on the substrate, homogeneous and stable film components without decomposition, capability of gradient varying film, 10-30 % porosity of the film surface favorable to the repairing and re-construction of bone tissue, etc.

The invention relates to a method for preparing alkali cellulose and viscose spinning adhesive from semi-wet slurry. The preparation method comprises the following steps: mixing, filtering water with a fourdrinier wire, dehumidifying, extruding, grinding, immersing for the first time, squeezing for the first time and grinding, immersing for the second time, squeezing for the second time and grinding, performing belt-type aging, yellowing, carrying out post-dissolving, mixing, filtering and defoaming so as to complete spinning adhesive preparation. According to the preparation method, pumping, drying, slitting and other production links during pulp preparation can be reduced, and the preparation can be completed by twice squeezing and grinding of pulp slush, the process is simple, the process flow becomes smaller, no new squeezing or grinding equipment is required, cost for reforming equipment is greatly reduced, conveying of fluid slurry is greatly reduced, energy consumption is greatly reduced, labor is saved, and technical grafting and transformation on an existing viscose fiber production line can be facilitated.

The invention discloses an aluminum alloy round ingot casting for a computer hard disk drive arm. The ingot casting comprises 0.60 to 0.80% of Si, 0.10 to 0.20% of Fe, 0.90 to 1.1% of Mg, 0.10 to 0.30% of Cu, 0.10 to 0.20% of Mn, 0.10 to 0.30% of Cr, smaller than 0.03% of single impurities and the balance Al. The production method comprises the steps that pure aluminum ingot solid cold charge andelectrolytic aluminum liquid are burdened, heating and melting are carried out at the proper temperature, an electromagnetic stirrer is started to rapidly melt the cold charge, temperature uniformityand component uniformity are kept, according to the chemical components in aluminum melt, alloying treatment is carried out, slagging-off is carried out to kept melt clean, high-purity N2 and a refined powder spraying agent are adopted to carry out powder spraying refining, online filtering, slag removal and gas removal are achieved, and through casting production and uniform heating treatment, the aluminum alloy round ingot casting meeting the requirement is produced. The ingot casting is stable and uniform in component, compact in internal structure, smooth and clean in surface, excellent inmechanical performance, and high in product interior cleanness, and the method is an optimal method for producing the aluminum alloy round ingot casting for the computer hard disk drive arm.

The invention discloses a making method of biological active composite material of HA/YSZ/polyimide through magnetic control sputtering method, which comprises the following steps: adding 5-40% YSZ powder in the nanometer graded HA powder; making HA/YSZ target material in the vacuum through heat sintering method; cleaning PI base; drying; placing on the base on the carrier of sputtering chamber; extracting the chamber into vacuum; making the pressure below 10-4Pa; activating the surface of PI base surface; placing HA/YSZ target material and PI base in the sputtering chamber; extracting the sputtering chamber into vacuum between 3*10-4 and 5*10-4 Pa; adjusting Ar flow quantity; reducing vacuum degree of sputtering chamber to 2*10-1Pa-1*10-1Pa; adjusting sputtering power to do firing sputter for 6-8h; fetching the sample out of sputtering chamber at 100-200 deg. c; insulating 2-4h; cooling.

The invention provides a method for preparing refined strong brine by removing potassium from strong brine, and relates to a method for removing potassium from strong brine. The method comprises the following steps of: under the temperature of 15-40DEG C, introducing raw material strong brine into an ion exchange column filled with modified zeolite to carry out an adsorbing reaction, adsorbing the raw material strong brine by an analogue moving bed technology till exchange reaction between the potassium ions in the raw material strong brine and the sodium ions on the modified zeolite is completed, and adsorbing to obtain the refined strong brine of which the K<+> content is 0.10g/L-0.39g/L; and eluting potassium ions in the ion exchange column after adsorption in the first step by taking saturated sodium chloride solution as eluant under the temperature of 25-95DEG C, so that the potassium-rich solution of which the potassium ion concentration is 10.23g/L-12.67g/L can be obtained, and the ion exchange column can be recycled after being eluted by the saturated sodium chloride solution. According to the method provided by the invention, the potassium ions in the electrically-dialysed strong brine can be effectively removed, and the qualified brine which meets the requirement of the chlor-alkali industry can be prepared.

The invention discloses steel for a front axle of a medium-sized truck and a production method of the steel. The steel comprises the following chemical components including, by weight, 0.39% to 0.43% of C, 0.20% to 0.37% of Si, 0.65% to 0.80% of Mn, 0.95% to 1.10% of Cr, 0.01% to 0.05% of Mo, 0.02% to 0.03% of Ni, 0.02% to 0.05% of Cu, less than or equal to 0.020% of P, 0.010% to 0.025% of S, 0.010% to 0.040% of Alt and the balance Fe and other inevitable impurities, so that the contents of Mo, Ni and Cu in the steel meet the condition that the sum of Mo, Ni and Cu is more than or equal to the sum of 0.013C, 0.033Mn and 0.034Cr and less than or equal to the sum of 0.018C, 0.026Mn and 0.065 Cr. According to the steel for the front axle of the medium-sized truck and the production method of the steel, the contents of Mo, Ni, Cu and other elements in the steel are accurately controlled, steel grains are refined, the impact toughness of the steel is improved, and the fatigue life of the automobile front axle is prolonged.