83results about How to "High metal utilization" patented technology

The invention relates to an electroslag smelting casting method of fixed blades of a water turbine. Consumable electrodes are prepared by adopting a voltaic arc furnace refining method and the fixed blades are prepared by adopting an electroslag smelting casting process through a mould. The chemical components of the consumable electrodes are controlled as follows: C is 0.14-0.19 percent, Si is less than or equal to 0.6 percent, Mn is 1.5-1.9 percent, P is less than or equal to 0.035 percent, S is less than or equal to 0.035 percent, V is 0.02-0.15 percent, Nb is 0.015-0.06 percent, Ti is 0.15-0.25 percent, Al is more than or equal to 0.015 percent, O is less than or equal to 0.0040 percent, N is less than or equal to 0.0080 percent, H is less than or equal to 0.00035 percent, and the balance is Fe. The electroslag smelting casting system and the electroslag guide are controlled as follows: CaF2 is 60-80 percent, Al2O3 is 40-20 percent, or less MgO and CaO (the total is less than or equal to 20 percent); and the electroslag amount is usually 1.5-5 percent of the weight of a casting. The invention has less amount of oxide and sulfide, small size, even distribution, clean casting base body, high cooling speed, large crystallization temperature gradient at the front of solid and fluid, compact casting texture, high size precision and little distortion, and can greatly improve the product property of the refined casting.

The invention aims to provide a preparation method for a non-Pt non-H anode catalyst of a proton exchange membrane fuel cell (PEMFC) to solve the problems of the conventional Ir-based catalyst preparation method. The method comprises the following steps: Ni ammonia complex cations are formed by taking strong ammonia solution as a complexant; Ni-Ir precursor is uniformly deposited on the surface of conductive carbon carrier due to the static attraction function between the Ni ammine complex cations and Ir complex anions under a water bath drying evaporation condition; finally, Ir and Ni are slowly released, reduced and alloyed from the complex compounds through hydrogen atmosphere heat treatment so as to form carbon carried Ir-Ni alloy catalyst of which the ingredients are uniform and the nano particles are distributed uniformly. According to the invention, the conventional Ir-based catalyst preparation method is greatly simplified; the surface of prepared catalyst is clean; the particle size of the catalyst is small; the catalyst is high in dispersion; the metal utilization ratio as well as the hadrogen and oxidization activity is effectively improved.

The present invention is preparation process of two-component and multiple-component loaded catalyst with relatively high loaded amount and containing noble metal(s) of Pt, Pd, Ru, Os, Ir, Rh, Re, etc. and other transition metal(s). By means of altering the solvent composition in dispersion system, raising the viscosity of solvent and lowering the diffusion rate of metal particles inside the solution effectively, it is possible to prevent the mutual polymerization and enlarging of metal particles without adopting macro molecule surfactant in preparing two-component and multiple-component loaded nanometer-level noble metal-based catalyst with high dispersivity and great loaded amount. Several kinds of metal may be loaded onto the carrier in once process while ensuring high metal dispersivity even in case of high metal loading amount.

The invention relates to a method for producing a bimetal composite material by adopting a cold core continuous casting and rolling process. The method is characterized by comprising the following steps of: using an inlet pinch and guide device to feed a cold core base material into a groove of a casting and rolling roller, continuously pouring a molten-state covering material in a ladle into an annular crystallizer constituted by the base material and the groove of the casting and rolling roller, driving the casting and rolling roller, continuously and uniformly coating the molten-state covering material on the surface of the cold core base material, and arranging a secondary cooling device and an outlet pinch and guide device on the outlet side so as to realize cold core continuous casting and rolling composite molding of a bimetal composite pipe or rod. The method has the advantages that the bimetal composite pipe or rod produced by the technological method has the advantages of low requirements on size and shape precision of a stock, no need of pre-assembly, high finished product rate, high metal utilization rate, no limitations on length and thickness of a covering layer of a product, a wide range of specifications of the product and the like, and the method is of a high-efficient production technological method. The product can be directly used as a finished product or be used as the stock for pipe rolling, cold drawing and other process steps.

The invention discloses a metallurgical bonding double-metal stainless steel cladding reinforcing steel bar and a preparation process thereof. The metallurgical bonding double-metal stainless steel cladding reinforcing steel bar comprises a carbon steel core part and a stainless steel cladding. The composite forming process comprises the following steps: integrally heating an outer-layer stainless steel pipe to 600 to 1000 DEG C by using an induction heater, pouring into inner-layer carbon steel, performing metal liquid casting and manufacturing an interface metallurgical bonding cladding type double-metal composite blank; hot-rolling the cast double-metal blank to form cladding double-metal round steel and threaded steel. The metallurgical bonding interface of the stainless steel layer and the carbon steel core is formed by casting, and the advantages of high bonding strength, excellent processing property, dense structure, high quality, few procedures, low cost, high efficiency and the like are achieved. The integral stainless steel reinforcing steel bar is replaced by the double-metal reinforcing steel bar, so on the premise of guaranteeing the corrosion-resistant characteristic of the reinforcing steel bar, the stainless steel material is saved, the engineering cost is reduced, the strength of the reinforcing steel bar is effectively improved, waste of resource and energy and environmental pollution are reduced, and a wide application prospect is achieved.

The invention provides a method for treating waste hard alloy. The method comprises the following steps of: oxidizing the waste hard alloy to convert tungsten into tungsten oxide; and reacting the oxidized waste hard alloy with alkali to convert the tungsten oxide into tungstate. By the method, the waste hard alloy can be effectively treated.

The invention discloses a preparation method of an alkynol selective hydrogenation catalyst. The preparation method comprises the following steps: (1), agitating and mixing a nitrogen-containing biomass with a surfactant, next adding an indium-containing metallic salt and acid liquor, mixing uniformly, and then performing drying and high-temperature calcination to obtain an indium oxide compoundednitrogen-doped porous carbon material; and (2), impregnating the indium oxide compounded nitrogen-doped porous carbon material in a Pd precursor solution, and then performing agitation, oven-drying,calcination and hydrogen reduction treatment in sequence to obtain the alkynol selective hydrogenation catalyst. The invention also discloses the alkynol selective hydrogenation catalyst prepared by the preparation method and application of the alkynol selective hydrogenation catalyst to an alkynol selective hydrogenation reaction in a vitamin industrial chain. The preparation method is simple; the prepared alkynol selective hydrogenation catalyst is compact in structure; nano particles of a Pd-In alloy are highly dispersed; and the alkynol selective hydrogenation catalyst has excellent catalytic performance.

The invention discloses a substance structure taking metal nanoparticle modified upright few-layer graphene as a nano-electrode and a preparation method of the substance structure. Upright few-layer graphene is called upright graphene for short, is obviously different from other carbon materials, and has the characteristic of great available surface. The metal nanoparticles are uniformly distributed on the surface of the upright graphene through a physical vapor deposition method, the average diameter of the particles can be controlled within the range of 0.5-100 nanometers, the coverage ratecan be controlled within 0-100%, and the particles are connected with the surface of the graphene through chemical bonds, so that the adhesive force is high, and the conductivity is good. The particles can be gathered at the edge of the graphene. The nanoelectrode has the advantages of improving the utilization rate of noble metal and increasing the catalytic efficiency, so that the noble metal consumption and the industrial cost are greatly reduced. The preparation method is energy-saving, efficient, quick and cheap, is suitable for mass production, and can be widely applied to electrochemistry, analytical chemistry, biochemistry, medical treatment, environment and energy related industries.

The invention relates to a vacuum assisted gravity pouring fuse cast thin wall casting method. It fixes the baked fuse mold casting shell inside the container with sealing device between the shell and the container, capped the top cover of the container, adjusting the fixed device, forming enclosed space between the shell and the container, turning on the heating device to retain the temperature requirement if necessary, turning on the vacuum system to establish the vacuum degree, pouring metal fluid into the cavity after the generation of negative pressure inside the shell, closing the vacuum system, release the vacuum, cleaning the shell to get the complete casting piece. The equipment structure is simple, small in investment, convenient in operation, being able to improve the final product rate of the thin wall casting piece and metal utilization rate to reduce production cost.

The invention discloses a metal monatomic catalyst and a preparation method thereof. The preparation method comprises the following steps: under the protection of inert atmosphere, dissolving a polyacetylene compound in an aprotic solvent; adding organic strong base and a metal salt precursor under the condition of -40 DEG C or below, performing heating and stirring for reaction, and then carryingout solid-liquid separation to obtain a precipitate; and washing, drying and grinding the precipitate to obtain a target product. The preparation method of the metal monatomic catalyst is simple, short in synthesis period and high in universality, and the obtained metal monatomic catalyst is good in thermal stability and high in metal monatomic loading capacity.

The invention discloses a metallurgically bonded stainless steel clad bimetallic steel and its preparation process, which includes a carbon steel core and a stainless steel cladding. The composite molding process includes the overall heating of the outer stainless steel tube to 600-1000°C by using an induction heater. The inner layer of carbon steel is poured into molten metal and cast to produce a clad bimetallic composite billet with a metallurgically bonded interface; the melted and cast bimetallic billet is hot-rolled to form a clad bimetallic section steel. The metallurgical bonding interface between the stainless steel layer and the carbon steel core is formed by melting and casting, and has the advantages of high bonding strength, excellent process performance, compact structure, good quality, fewer procedures, low cost, and high efficiency. The present invention uses bimetallic steel instead of integral stainless steel. On the premise of ensuring the anti-corrosion properties of steel, it not only saves stainless steel materials, reduces engineering costs, but also effectively improves the strength of steel bars, reduces waste of resources and energy and environmental pollution, and has the advantages of Broad application prospects.

The invention relates to the manufacture field of impact type rotating wheels, and in particular relates to an electroslag fusion casting manufacture method of rotating wheel blanks of an impact type hydraulic generator. The electroslag fusion casting manufacture method is an electroslag fusion casting technology for impact type rotating wheel integral casting blanks and individual rotating wheel water tank blanks. According to the method, self-consumable electrodes and the electroslag fusion casting technology are adopted; the rotating wheel integral casting blanks are produced by rotating wheel integral casting circular type blank crystallizers under an integral structure or an individual combined structure; and the individual rotating wheel water tank blanks are produced by rotating wheels water tank crystallizers under the integral structure or the individual combined structure. With the adoption of the method, the shortcomings of the current production technology of high water head impact type rotating wheel blanks can be solved; the near net forming impact type rotating wheel integral casting blank manufacture technology and the individual rotating wheel water tank blank manufacture technology are adopted; the produced rotating wheel blanks and the water tank blanks are high in fatigue resistance, high in crack generation and expansion resistance, long in service lives and high in use safety; and the quality and performance of the produced rotating wheel blanks and the water tank blanks are in line with those of forged blanks obtained by using the same materials; and the method has the advantages of low production cost, short production period and the like.

The invention discloses a manufacturing technology of a composite roll sleeve, and equipment. The manufacturing technology comprises the steps of integrally heating a thick-wall hollow steel tube core rod mounted in a combined water-cooling crystallizer to be 800-1000 DEG C by an induction heater, pouring a roll shaft working layer melt, continuing to heat for 10-50min, starting a lifting device to lift the heater at a certain speed, stopping lifting when the heater is lifted to a heat preservation ring by 5-15min, continuing to heat for 10-50min, feeding a feeder head, and supplying water to cool for 30min-24h after heating stop. The composite roll sleeve manufactured by the technology is few in controllable technology parameter; an interface of a composite layer is easy to control; the technology is simple; the efficiency is high; power consumption is low; the composite layer has no component segregation; the service life is long; the defects of structure segregation of a centrifugal method and poor performance and high cost of a traditional embedding method are overcome.

The invention aims to provide a torsion shaft for an aerogenerator, and an electroslag refusion casting method thereof, and the torsion shaft combines technical advantages of arc metallurgy and technical advantages of electroslag refusion casting (ESRC). A casting produced by adopting the preparation technology of the MW grade wind-powered torsion shaft provided in the invention has the advantages of uniform and compact crystal tissue, high purity, less nonmetallic inclusions, possessing of excellent compactness and fatigue resistance, reaching of forging flaw detection quality standards, realization of near net-shape forming, and low cost. The internal quality of the produced torsion shaft is obviously better than that of torsion shafts produced through sand casting.

The invention relates to hot-rolled J-type steel which comprises a web plate and wing plates. The wing plates include the first wing plate, the second wing plate and the third wing plate. The two ends of the web plate are connected with the first wing plate and the third wing plate respectively, the first wing plate and the third wing plate are located on the same side of the web plate, are mutually parallel and are perpendicular to the web plate, the second wing plate is connected with the first wing plate and connected with the end portion of the web plate, and the second wing plate and the first wing plate are located on the same vertical plane and also perpendicular to the web plate. The hot-rolled J-type steel is used for manufacturing forklift portals, in the hot-rolling production process, a groove is not required to be formed in a finish-rolling plain roller, the first wing plate and the second wing plate are located on the same vertical plane, and therefore the size, the position and the appearance of the formed groove are easily controlled; compared with existing hot-rolled J-type steel, the hot-rolling production difficulty is reduced, a hot-rolling technical device is simplified, the investment cost is reduced, the hot-rolling production efficiency is greatly improved, the rigidity of a formed-steel structure is improved, and the production cost is reduced.

The invention relates to a preparation method for a modified ternary metal bulk phase catalyst added with accessory ingredients. Two different accessory ingredients are introduced into a process that a non-supported catalyst is prepared by a coprecipitation method, and active ingredients and the accessory ingredients are combined, i.e., tween and kieselguhr are added into a mixed solution of nickel molybdate and ammonium metatungstate to respectively serve as a dispersant surfactant and a dispersant. According to the preparation method for the modified non-supported catalyst provided by the invention, the dispersibility of active metal ingredients and the hydrogenation property of the catalyst can be effectively improved, the mechanical strength of the non-supported catalyst is obviously improved, and meanwhile, the strict requirement of the modified catalyst for the deep desulfurization of diesel by the national standard after hydrogenation reaction is carried out can be guaranteed.

The invention relates to the field of electroslag smelting casting production of turbine runner blade castings, in particular to a turbine runner three-dimensional curved surface blade electroslag smelting casting direct forming method. Electroslag smelting casting is used for completing secondary refining purification and casting near net forming of consumable electrode materials. The specific process comprises the following steps that 1) the structure form of a casting blank crystallizer is of an assembled type or a split type; 2) consumable electrodes in the smelting casting process consistof two parts, namely the fixed electrodes and the movable electrodes; and 3) a power supply mode adopts an alternating current single-electrode series loop and double-electrode series loop mixed power supply mode, by means of a power loop formed between double-electrode series electrodes, the slag layer temperature of an electroslag smelting casting area is increased, the metal fluidity of the area is improved, the solidification speed of the area is controlled, and blade smelting casting forming is achieved. The technology provided by the invention is applicable to manufacturing of the castings of tubular turbine generator runner blades or mixed-flow turbine generator runner blades or axial flow turbine generator runner blades.

The invention relates to hot-rolled inequilateral channel steel. The hot-rolled inequilateral channel steel comprises a web and wing plates, wherein the wing plates comprise a first wing plate and a second wing plate; two ends of the web are connected with the first wing plate and the second wing plate respectively; the first wing plate and the second wing plate are located on the same side of the web, are parallel to each other and perpendicular to the web; and the height of the first wing plate is larger than that of the second wing plate. According to the hot-rolled inequilateral channel steel, the first wing plate and the second wing plate adopt an inequilateral design, the first wing plate is higher than the second wing plate by 5-30 mm, so that in combination production of a forklift truck gantry and under the same bearing capacity, steel material consumption is reduced, dead weight of a gantry system is reduced wholly, and the manufacturing cost of the gantry is reduced; and meanwhile, due to the inequilateral channel steel design, the inequilateral channel steel is attractive in appearance, not easy to deform and higher in bending resistibility, stable running of the roller is guaranteed, friction period between the roller and section steel is prolonged, and the service life of the channel steel is prolonged.

The invention discloses an H-type steel concrete structure. The H-type steel concrete structure comprises an H-type steel and concrete covered outside the H-type steel, wherein the H-type steel comprises a web, a top flange and a bottom flange; the web is arranged between the top flange and the bottom flange; the surfaces of the top flange and the bottom flange respectively include an inner side surface and an outer side surface opposite to the inner side surface, and the outer sides of the top flange and the bottom flange are respectively connected with the web; the outer sides of the top flange and/or the bottom flange are provided with a projection; the outer side of the web is provided with a groove, and the outer side of the web is served as the web surface extended along the length direction of the top flange. Through the technical solution, the adhesion strength between the H-type steel and the concrete is improved.