133results about How to "Coarse grain" patented technology

The invention discloses steel 18MnMoNbR for a pressure vessel. The steel 18MnMoNbR comprises the following chemical components in percentage by weight (wt%): 0.16-0.20% of C, 0.25-0.45% of Si, 1.35-1.45% of Mn, 0.5-0.6% of Mo, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.015-0.040% of Als, 0.030-0.040% of Nb, 0.010- 0.020% of Ti and the balance of Fe and other residual elements, wherein the carbon equivalent of the chemical components is less than or equal to 0.04. Furthermore, the invention provides a process for producing an steel 18MnMoNbR plate with a thickness of 100mm. Due to the processes of pretreating molten iron by adopting the KR method, smelting by a converter, blowing argon, carrying out LF refining, carrying out VD refining, casting a die, heating, controlling rolling and cooling, cooling a pile and carrying out heat treatment, the content of harmful elements such as P and S which can affect the toughness of the steel 18MnMoNbR plate in steel can be controlled on the basis of guaranteeing the components of the steel 18MnMoNbR. In addition, by strictly controlling the heating cycle of the rolled steel, strictly controlling finishing rolling temperature, the reddening temperature and the cooling speed in the rolling process and cooling the steel-plate pile slowly, all the performance indexes of the steel 18MnMoNbR plate with the thickness of 100mm can meet the standard requirements.

A welding method of an aluminum alloy sputtering target material for an integrated circuit package material comprises the steps that a protruding tooth of a certain shape and size is machined on the welding face of the target material, a corresponding groove is machined in a back plate, the target material and the back plate are put into a wrapping sleeve for carrying out vacuum seal welding after being assembled and combined, then a hot isostatic pressure method is adopted for enabling the groove to be completely filled with the material, and the target material is connected with the back plate. Due to the fact that welding temperature is low, aluminum alloy grain growth can be avoided, the welding intensity between the target material and the back plate is high, the target material is small in overall deformation, and subsequent machining is facilitated.

The invention discloses a weldable fine grain structural steel S355NL/S355NLZ35 steel plate, which comprises the following chemical components by wt%: 0.10-0.18of C, 0.20-0.45 of Si, 1.20-1.45 of Mn, less than or equal to 0.018 of P, less than or equal to 0.005 of S, 0.015-0.050 of Als, 0.010-0.055 of V, 0.005-0.025 of Ti, and the balance Fe and residual elements. The production method consists of: KR molten iron pretreatment, converter smelting, argon blowing treatment, LF (ladle furnace) refining, VD (vacuum degassing) refining, continuous casting, heating, controlled rolling and controlled cooling, stack cooling, and normalizing. According to the invention, content and proportion of C, Mn and Nb alloy elements are adjusted properly, and content of harmful elements in steel like P and S etc. influencing the plasticity and toughness of the steel plate is strictly controlled, and meanwhile, the heating system of steel rolling is strictly controlled. The rolling process employs a mode of lowering finish rolling temperature, speeding up cooling after rolling, and conducting steel plate stacking and slowing cooling after rolling, thus guaranteeing all performance indexes of the weldable fine grain structural steel S355NL/S355NLZ35 steel plate meeting the standard requirements.

The invention discloses a high-strength aluminum alloy subjected to carbonitride complex treatment and a preparation method thereof. The alloy comprises the following components in percentage by weight: 2.0-3.2 percent of Cu, less than or equal to 0.2 percent of Mn, 0.2-0.5 percent of Mg, less than or equal to 0.01 percent of Cr, less than or equal to 0.01 percent of Ni, less than or equal to 0.1 percent of Zn, less than or equal to 0.15 percent of Ti, less than or equal to 0.5 percent of Si, less than or equal to 0.5 percent of Fe, and the balance of Al and inevitable trace impurities, wherein the carbonitride MX(C,N)Y is 0.05-2.5 percent of total mass of the furnace burden. The aluminum alloy has the characteristics of high strength and good casting performance.

The invention discloses a metal inert gas (MIG) welding method of an aluminum alloy thin plate for a high speed train. The method is characterized in that an ER5356 welding wire and 99.9% argon protective gas are selected to conduct single pass welding. The method includes the following steps: 1) surface machining of a workpiece to be welded; 2) MIG welding; 3) welding gap defect checking. The step 1) includes that the workpiece to be welded is not preheated, an organic solvent is directly adopted to remove grease dirt and dust on the surface of the workpiece to be welded, and a mechanical method is adopted to remove an oxidation film on the surface of the workpiece in a washing mode. The step 2) includes that weld heat input is controlled between 4.0KJ/cm and 5.0KJ/cm during MIG welding, and environment humidity is controlled to be smaller than or equal to 70%. The step 3) includes that pore defects of a welded workpiece are removed through a steel wire brush or an air chipper. The method has the advantage that thin plate aluminum alloy welding connector pore welding hot crack number can be greatly reduced, welding gap forming is good, welding deformation is small, welding connector strength is higher, the MIG welding quality of the aluminum alloy thin plate for the high speed train is effectively improved, and welding quality stability is ensured.

The invention discloses a method for prolonging service life of an engine thermal barrier coating by controlling components of a thermal growth oxide layer. The thermal barrier coating utilizes high velocity oxy-fuel spray to prepare a bonding layer, utilizes low-energy power or high-energy power of atmospheric plasma to spray on a ceramic layer, then a combined technology of vacuum heat treatment and atmospheric diffusion heat treatment is carried out on the thermal barrier coating to restrain a premature appearance of spinel so that an edge of the thermal barrier coating is mainly alumina. Materials with a specific orientation of large grains are formed at the interface position of the alumina and the bonding layer to prevent oxygen from further largely intruding into the bonding layer and a base metal in a high-temperature service process. And the high-temperature service life of the thermal barrier coating is improved.

The invention discloses an extrusion forming agent, and preparation and use thereof, in particular to a forming agent for a tungsten-based alloy or hard alloy or ceramic powder extrusion forming process, and preparation and use thereof. The forming agent comprises 60 to 80 percent of solid and liquid paraffin wax, 3 to 8 percent of carnauba wax, 10 to 20 percent of high density polyethylene and ethylene-vinylacetate copolymer, 1 to 8 percent of plasticizer, 1 to 5 percent of stearic acid and the balance of modifier. In the invention, the drawbacks of long degreasing time, low degreasing conformality and more degreasing defects of extrusion blanks, particularly large-size extrusion blanks, are overcome, the raw materials are cheap and easy to purchase, the component compatibility of the prepared forming agent is high, the forming agent is used in a powder extrusion forming process, the micro structure of the forming agent is uniform, the forming agent has strong interaction force with powder, the formability is high, the quick and flawless degreasing of blanks with a thickness of 40 millimeters can be realize, the production efficiency is improved, and the development of extrusion forming industry is promoted greatly.

The invention discloses a silicon-aluminum alloy, belonging to the technical field of metal materials. The silicon-aluminum alloy disclosed by the invention contains the following components in percentage by weight: 6-10% of magnesium, 8-16% of silicon, 0.05-0.15% of iron, 0.05-0.2% of copper, 0.02-0.15% of manganese, 0.06-0.25% of chromium, 0.08-0.22% of nickel, 0.1-0.2% of titanium, and the balance of aluminum. Compared with the traditional aluminum alloy, the silicon-aluminum alloy disclosed by the invention is steady in component, good in quality, free from segregation, more uniform in tissue, uniform in grain size and better in performance.

The invention provides a nano-matrix-combined high-performance fused magnesium calcium brick and a manufacturing method thereof. The fused magnesium calcium brick is prepared from 8-5mm high-calcium fused magnesium calcium sand, 5-2mm high-calcium fused magnesium calcium sand, 2-0mm high-calcium fused magnesium calcium sand, <=0.074mm high-calcium fused magnesium calcium sand, 8-5mm fused magnesite, 5-2mm fused magnesite, 2-0mm fused magnesite, <=0.074mm fused magnesite fine powder, nano sea water magnesia fine powder and a binder paraffin. The manufacturing method comprises the following steps: fine powder premixing, integral compounding, molding, drying, firing and the like. The product has the advantages of compact microstructure, fewer low-melting-point minerals, higher erosion resistance, higher scour resistance, higher stripping resistance and higher hydration resistance. The furnace life is prolonged by 30% above on average. Thus, the product satisfies the requirements of high efficiency, long service life and high cleanness for stainless steel and special steel smelting, and lowers the cost for the steel enterprises.

The invention provides a method for preparing a CuW/Cu/CuCrZr integrated contact through electron beam welding and belongs to the field of production and manufacturing of high-voltage switch electrical contacts. One side of the electrical contact is made of a base material CuW/Cu, and the other side of the electrical contact is made of a base material CuCrZr. The method comprises the following steps that 1, the base material CuW/Cu on one side of the electrical contact is manufactured in a connection mode through a sintering method; and 2, the CuW/Cu subjected to sintering treatment and the CuCrZr are subjected to direct electron beam welding, a welding surface is made of Cu and the CuCrZr, a welded joint is a square butt joint, the joint gap value is zero, welding filling materials are not filled, a weld forming a 45-degree angle with the axis of the contact is adopted for electron beam welding, and thermal treatment is not needed after welding. Compared with the prior art, the high-temperature mechanical performance of chromium-copper can be improved, and the high welding strength can be achieved; moreover, it can be guaranteed that a Cu base is not annealed or softened; meanwhile, the stress of a vertical weld heat-affected zone is small, the sectioned contact cannot deform after being pulled and inserted for many times, and the contact finger force is stable.

The invention discloses a quenching machine accelerated cooling method for improving the strength of a normalized steel plate with the thickness specification of being greater than or equal to 50 mm. The quenching machine accelerated cooling method comprises the following steps: the normalized steel plate enters a quenching machine along a quenching machine roller way after being discharged from a quenching furnace to be subjected to water cooling, four or six low-pressure sections are confirmed to be opened according to steel varieties and specifications, and the opening degrees, the upper and lower opening degree ratios and the roller way speeds of the areas of the low-pressure sections are adjusted, so that the steel plate is naturally cooled after the 'self-tempering' temperature reaches 580-630 DEG C, wherein the water yield control parameters are as follows: the opening degree of a flow control valve at the 15 area of the low-pressure sections is 30-40%, and the opening degree of a flow control valve at the 16 area of the low-pressure sections is 35-50%; the opening degree of a flow control valve at the 17 area of the low-pressure sections is 40-50%, and the opening degree of a flow control valve at the 18 area of the low-pressure sections is 45-60%; the opening degree of a flow control valve at the 19 area of the low-pressure sections is 60-70%, and the opening degree of a flow control valve at the 20 area of the low-pressure sections is 65-80%; the steel plate cooling speed is controlled to be 8-10 DEG C/S. The water cooling uniformity is good, the plate form after the cooling is good, and the strength of the normalized steel plate can be greatly improved through water cooling.

The invention relates to a method for decomposing scheelite through pressurizing by adopting phosphorus-sulfur mixed acid. According to the main improved point, in the process of extracting the tungsten from the scheelite by using the mixed acid of phosphoric acid and sulfuric acid, pressurization treatment is carried out on a reaction system, so that the temperature of the reaction system is higher than 100 DEG C. According to the method, pressurized high-temperature treatment is carried out on the reaction system of extracting the tungsten from the scheelite by the phosphoric acid and the sulfuric acid, under the condition that the extraction rate of the tungsten is guaranteed, the addition amount of the phosphoric acid and the sulfuric acid is reduced, and the addition of calcium sulfate crystal seeds is omitted; and compared with an existing non-pressurization method, the method still has the advantages of being high in decomposition rate, free of generation of hazardous waste decomposition slag and low in decomposition cost.

The invention discloses a method for excluding sodium oxalate and carbonate from Bayer process solution by adopting an ultra-concentration method. The method comprises the steps of: concentrating the mother liquor of an alumina system, sending liquor in the concentrated mother liquor to an alumina production system, and then send to a first segment causticization tank for causticizing for 2 to 4 hours to obtain seriflux B after solid phase dissolution; cooling the seriflux B to 50 to 70 DEG C and send to a second segment causticization tank for causticizing for 1.5 to 3 hours at 50 to 70 DEG C to obtain seriflux C; sending the seriflux C into a separating and washing machine, sending washed liquid to the alumina production system, and sending residues an alumina red mud washing system. The invention not only has the advantages of good excluding effect, simple process, less investment and low production and operation cost, but also achieves less loss of alumina, and has good use value and economic value.

The invention discloses an aluminum alloy capable of digesting high-hardness compounds and a smelting method of the aluminum alloy. The method comprises the following steps of: heating aluminum ingots or molten aluminum till complete melting; adding Si, Fe, Cu, Mn, Mg, Cr, Zn and Ti, and completely dissolving and melting the elements; preserving the heat at the temperature of between 700 and 1,000 DEG C after refining, and obtaining an alloy melt; performing degassing purification operation on the alloy melt by using nitrogen or inert gas or mixed gas of the nitrogen and the inert gas in a random ratio, and continuously introducing the gas till the reaction is finished; adding LaH3 powder into the alloy melt in a fluidized form together with the gas; stirring to make the LaH3 distributed uniformly in the alloy melt and fully reacted with the alloy melt; and standing, regulating the temperature to 680-730 DEG C, and discharging the molten alloy for casting. By the method, the defects of the properties of the conventional aluminum alloy can be overcome, the toughness, the forming property and the hardening capacity of the aluminum alloy are improved, and a high-end base material is provided for efficient deep processing.

A polyimide film-soda glass composite substrate based sodium-doped copper indium gallium diselenide solar cell device is characterized in that a substrate is composed of soda glass and a polyimide film growing on the surface of the substrate, and copper indium gallium diselenide solar cells are manufactured on the surface of the composite substrate. The sodium-doped copper indium gallium diselenide solar cell device has the advantages that the polyimide film-soda glass composite substrate based copper indium gallium diselenide film is excellent in adhesion property and good in crystallization quality, crystalline grains are large, and the defects are few; after the whole copper indium gallium diselenide solar cells are manufactured, the solar cells are separated from the soda glass to form the flexible copper indium gallium diselenide solar cells using the polyimide film as the substrate, and the flexible cells are manufactured by using the rigid substrate; a manufacturing method is simple and easy to implement, and the solar cell device is suitable for large-scale popularization and application and especially has very wide application prospect in a space occasion and special occasions.