64results about How to "Control precipitation" patented technology

The invention discloses a high-strength high-conductivity copper-chromium-zirconium alloy and a preparation method of a plate/strip thereof. This alloy comprises the chemical composition: 0.01-1.5 wt% of Cr, 0.01-0.5 wt% of Zr, 0.001-0.5 wt% of Ti, 0.01-0.5 wt% of Mn, 0.0001-0.07 wt% of Ca, and the balance of copper and unavoidable impurities; the position and process of the Cu-Cr-Zr alloy are optimized, the provided high-strength high-conductivity copper-chromium-zirconium alloy retains high conductivity (above 80% IACS), elastic modulus up to higher than 130 GPa, softening temperature resistance up to higher than 500 DEG C, yield strength up to higher than 550 MPa and hardness up to 160 HV, the copper-chromium-zirconium plate/strip is imparted high strength, high conductivity and excellent comprehensive performance, this comprehensive performance meets the requirements of products such as a lead frame and a connector upon base material stamping and machining performances, and this plate/strip material is mainly applied to electronic components such as connectors and lead frames.

A method for producing a wide steel strip using thin slab continuous casting and rolling by the following steps a) casting a molten steel into a thin slab having a thickness of between 50 and 90 mm; b) cutting; c) soaking; d) heating by electromagnetic induction; e) descaling; f) rolling; g) cooling with laminar flow; and h) coiling. The method can effectively control the solution and precipitation of carbon, nitrogen, and sulfide in steel with a low cost. The process is easy and flexible, and steel can be produced in a wide range of categories. Further provided is a system for producing a wide steel strip with thin slab continuous casting and rolling.

The invention belongs to the technical field of metal and alloy fabricating and heat treatment, and provides a hot working method for improving strength of a wrought aluminium alloy and keeping plasticity of the wrought aluminium alloy. The method comprises the steps that the aluminium alloy is cast to form a cast ingot; the cast ingot is subjected to homogenization treatment and heat deformation treatment to form a plate; and the plate is sequentially subjected to solid solution and quenching treatment, natural aging treatment, cold deformation treatment and artificial aging treatment. The method can be used for large-scale production of high-strength aluminium alloys; and compared with the existing hot working method, the manufacturing cost is not increased.

The invention discloses a control method of coating performance surface quality of a double-phase steel cold-rolled high-strength automobile board, which comprises smelting, continuous casting, hot rolling, descaling, acid rolling, continuous annealing and leveling. The descaling process uses a three-stage descaling process, wherein the descaling position comprises descaling after a heating furnace, descaling before rough rolling and descaling before finish rolling, the descaling pressure at each descaling point is greater than or equal to 24MPa, the rough rolling is reciprocating rolling, therolling is carried out for 5 times, and high-pressure water descaling is carried out for every time. By adjusting and optimizing a whole process production process, including controlling the chemicalcomposition of a continuous casting blank, improving the heating and cooling system of the continuous casting, hot rolling, and cold rolling, controlling the hot rolling and descaling processes and cold rolling and acid rolling processes, controlling the roughness of a leveled steel strip, and the like, the surface quality of the double-phase steel cold-rolled automobile board is improved, the element enrichment on the surface of the steel board is inhibited, the quality of a phosphating film is improved, the coating performance of the double-phase steel cold-rolled high-strength automobile board and the anti-corrosion performance of the double-phase steel cold-rolled high-strength automobile board after being coated are improved.

The invention relates to a preparation method of a long-periodic-structure particle-reinforced magnesium-base/aluminum-base composite material. The preparation method comprises the steps of adding reinforced particles adopting an Mg-Zn-Y system into magnesium powder, aluminum powder, magnesium alloy powder or aluminum alloy powder, and carrying out hot-pressing and sintering by virtue of an SPS method or a cubic press method, so as to obtain the magnesium-base/aluminum-base composite material. The magnesium-base/aluminum-base composite material does not contain heavy rare earth elements such as Er, obtained reinforced phase particles are converted into nanocrystallines by virtue of high-energy ball milling, are high in hardness and have good bondability with a magnesium matrix/aluminum matrix, and the composite material with excellent performance is prepared.

The invention discloses a natural fresh-keeping solution for boiled bamboo shoots. The fresh-keeping solution comprises the following raw materials: 0.02-0.08 g of sodium isoascorbate, 0.01-0.06 mL of phytic acid, 0.05-0.15 g of ascorbic acid and 2-3 g of glycine which are dissolved in every 100 mL of de-ionized water. The pH value of the prepared fresh-keeping solution is 4-4.4 at room temperature. The raw materials of the prepared fresh-keeping solution are all pure natural animal and plant extracts which are environment-friendly and safe; the preparation method of the fresh-keeping solution is simple and easy to implement; and the fresh-keeping solution has an outstanding fresh-keeping effect on a product.

The invention discloses wear-resistant steel and a production method thereof, and relates to the technical field of steel production, and the wear-resistant steel comprises the following chemical components in percentage by mass: 0.10 to 0.45 percent of C, 0.20 to 0.55 percent of Si, 0.50 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.030 percent of V, 0.008 to 0.025 percent of Ti, 0.20 to 1.00 percent of Cr, less than or equal to 1.80 percent of Ni, less than or equal to 0.50 percent of Mo, 0.025 to 0.055 percent of Al, 0.0010 to 0.0030 percent of B, 0.0010 to 0.0018 percent of Mg, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities. On the premise that the high-strength martensite structure of the wear-resistant steel plate is guaranteed, through quantitative treatment of microalloying elements, the number and the size of carbonitride are reduced, the cooling speed and the austenite temperature of a casting blank are regulated and controlled, a secondary quenching optimization process is adopted, structure grains are refined, structure stress is eliminated, and the wear resistance of the wear-resistant steel plate is improved. The problem of delayed cracks of wear-resistant steel in the cutting and grinding process of casting blanks and steel plates is solved.

The invention discloses a core-shell structure powder fire extinguishing medium and a preparation method and application thereof, and relates to the technical field of fire extinguishing. The core-shell structure powder fire extinguishing medium is prepared from, by weight, 2-10 parts of a shell material and 85-98 parts of a core material, wherein the core material is a potassium salt aqueous solution or an iron salt dispersion liquid. The core-shell structure powder fire extinguishing medium is clean, environmentally friendly, safe and free of toxins, is simple in preparation process, high incooling speed, good in liquidity, low in corrosivity to storage equipment and conveying pipelines, good in stability and wide in application range, can quickly extinguish gas, liquid and solid fires,does not generate harmful gas and environmental pollution in the fire extinguishing process, and has good economic and social benefits.

The invention discloses a coating for lost foam casting of engine cylinder blocks and a preparing method thereof, belongs to the technical field of lost foam coating, and aims to provide a lost foam coating with fine coating property, fine breathability and high strength and a preparing method thereof. The technical scheme includes that the coating for lost foam casting of engine cylinder blocks is prepared by the following raw materials: by weight part, 100 parts of quartz sand powder, 5-10 parts of sodium bentonite, 0.1-1 part of cellulose, 5-15 parts of resin, 0.01-0.08 part of tween, 0.02-0.1 part of octanol, 1-5 parts of flour and 60-90 parts of pure water. The coating for lost foam casting of engine cylinder blocks and the preparing method thereof can be applied to various of lost foam casting fields in the prior art widely.

The invention discloses a rolling method of Cu-Cr series alloy plates and strips. Alloy comprises the chemical components of 0.5-1.5% of Cr, 0.03-1.8% of Zr, <=0.08% of Fe, <=0.1% of Si and the balance of copper and unavoidable impurities. The rolling method comprises the steps of (1) proportioning; (1) upward-drawing continuous casting; (3) hot continuous rolling of a square billet; (4) solutiontreatment; (5) surface milling; (6) rough rolling; (7) aging treatment; (8) surface treatment; (9) finish rolling; (10) take-up; and (11) slitting. The method can lower production cost and improve product quality and the percent of pass of finished products, thereby greatly meeting market demands.

The invention provides a paste for a light receiving surface electrode of a solar cell, wherein the paste can form an electrode that has high binding strength with a substrate and low contact resistance and furthermore high output can be obtained on condition that an LDE substrate is used, and a manufacturing method of the paste, and a solar cell unit with high output. The conductive paste for forming the light receiving surface electrode comprises leadless tellurite glass with various compositions. Various lead-containing additives and an additive with high-melting-point metal are mixed in the paste. Preferably the lead is carried in appropriate methods of false firing, chemical method, mechanical method, etc. Therefore if the electrode of the light receiving surface is formed through a fire-through manner, an erosion surface which appropriately has recesses and projections can be obtained. Therefore a requirement for a high electric characteristic and high binding strength can be satisfied. Furthermore, because the light receiving surface electrode (28) contains high-melting-point metals and lead, recombination is suppressed. Therefore high output can be obtained even the LDE substrate is equipped.

The invention relates to a salt bath heat treatment method for tool and mould steel, in particular to a salt bath annealing method for the tool and mould steel. The method has the advantages that thequality and the performance of the annealed structure of materials can be improved. The method comprises the following steps that 1) high-temperature salt bath treatment is carried out, specifically,the tool and mould steel is put in a salt bath with the temperature of 840-920 DEG C for heat preservation so as to enable the temperature of the tool and mould steel to be uniform; 2) isothermal saltbath treatment is carried out, specifically, the tool and mould steel subjected to high-temperature salt bath treatment in the step 1) in put in a salt bath with the temperature of 710-780 DEG C forisothermal treatment; and 3) air cooling is carried out, specifically, air cooling is carried out on the tool and mould steel subjected to isothermal salt bath treatment in the step 2) to reach the room temperature so as to obtain the tool and mould steel with the uniform structure. The tool and mould steel prepared through the method has the advantages of being uniform in structure, uniform in grain size and good in machining performance and using performance.

The invention relates to the field of crude oil exploitation, and discloses an asphaltene dispersant, application thereof, and a method for inhibiting deposition of asphaltene in heavy oil and removing asphaltene deposits in the heavy oil. The asphaltene dispersant comprises a biomass phenol compound, oil-soluble resin and a solvent, wherein the biomass phenol compound is cardanol and/or cashew nut shell oil. The asphaltene dispersant provided by the invention can effectively control the deposition of asphaltene in a heavy oil production process, and can effectively remove the existing asphaltene deposits, thereby ensuring the normal production of a heavy oil well.

The invention relates to the field of polypropylene casting packaging films, and discloses a polypropylene resin composition, a special material for an aluminum-plated casting polypropylene film, the aluminum-plated casting polypropylene film as well as a preparation method and application of the aluminum-plated casting polypropylene film. The polypropylene resin composition comprises an ethylene-propylene random copolymer and a compound auxiliary agent, wherein the compound auxiliary agent comprises a main antioxidant, an auxiliary antioxidant, a halogen absorbent, an anti-sticking agent, a reinforcing agent and a blocking agent. The corona attenuation retention and the aluminizing adhesive force of the aluminizing casting polypropylene film prepared from the composition are obviously improved, and the aluminizing casting polypropylene film is good in transparency and good in mechanical property.

The invention provides a device and a process for producing 1-octylene by ethylene selective oligomerization, and relates to the field of chemical industry. The device comprises an oligomerization reactor, the circulation pipeline is led out from the top of the oligomerization reactor and returns to the oligomerization reactor, a gas compression device, a heat exchanger and a gas-liquid separator are sequentially arranged on the circulation pipeline, the gas compression device is connected with the top of the oligomerization reactor, and a gas phase outlet and a liquid phase outlet of the gas-liquid separator are respectively communicated with the inside of the oligomerization reactor. A solvent used in the process can comprise a low-boiling-point component and a high-boiling-point component, the low-boiling-point component is selected from C3-C5 hydrocarbons, and the high-boiling-point component is selected from C6-C10 hydrocarbons. According to the device and the process, reaction heat can be effectively and stably removed, precipitation of polyethylene and oligomer generated in the reaction on a heat exchange wall surface is reduced, the cost of a cooling medium is reduced, meanwhile, the reaction temperature is stably controlled, and the reaction efficiency and selectivity are improved.

The invention discloses a cooling bed controlled cooling device for hot-rolled micro-alloyed steel bars, and belongs to the technical field of hot-rolled micro-alloyed steel bar equipment. Three cooling sections and a cooling bed control system are included. The three cooling sections are an organization regulation and control cooling area I, an organization regulation and control cooling area IIand an organization regulation and control cooling area III, the length of each section of organization regulation and control cooling area is 100-120 m, and the length of a whole cooling bed is covered. The cooling bed controlled cooling device has the advantages that through segmented arrangement, the cooling path is optimized, a process window is provided for control over precipitation of micro-alloy elements in the cooling process and refining of pearlite sheet interlamellar spacing is provided, and accordingly the refined controlled cooling technology is achieved.

The invention discloses aluminum-containing low-carbon steel and a preparation process, and belongs to the technical field of steel smelting, the preparation process is as follows: converter primary smelting: (11) after scrap steel is added into molten iron, top-bottom combined blowing is adopted for blowing, a slagging material is added during blowing, the basicity of slag is controlled to be 2.8-3.8, and blowing continues; (12) tapping is performed; refining: (21) after the molten steel enters a CAS furnace, argon blowing, temperature measurement, sampling and analysis are carried out; (22) component adjustment, alloy addition, argon blowing, temperature measurement and sampling are performed according to an analysis result; (23) tapping is performed; and continuous casting: the temperature of a crane ladle is 1595-1605 DEG C, the temperature of a tundish is 1547-1567 DEG C, pouring is performed at a constant pulling speed, and the pulling speed of a casting blank is 0.9-1.25 m/min. According to the preparation process, the purity of the molten steel can be improved, and inclusions in the molten steel are reduced.

The invention discloses a Cu-Ni-Be alloy thermomechanical treatment strengthening process: heating the Cu-Ni-Be alloy ingot to 960-980°C, keeping it warm for 60-180min; then performing 30-60% hot extrusion forming, The speed of hot extrusion is 0.05~1m/s, and then water cooling. After hot extrusion, the water temperature of the ingot entering the billet is not less than 950°C, and the cooling water temperature of the circulating water is not more than 30°C; finally, the aging treatment is carried out at 470°C×3h, and then air-cooled. The advantages of the present invention are: according to the strengthening basic principle of Cu-Ni-Be alloy products, an integrated treatment process of heating, hot extrusion or hot pressing, water cooling and aging is designed, which promotes the further precipitation of alloy aging precipitation phases, and the precipitation phases The alloy is more fine, uniform and dispersed, and has good comprehensive performance; the invention strengthens the process, simplifies the process steps, saves costs, and at the same time enables the alloy to obtain good comprehensive performance.