82results about How to "Promote alloying" patented technology

Provided is a zinc-plated steel sheet for hot pressing having outstanding surface characteristics, comprising: a steel foundation plate comprising a metal surface diffusion layer of which the Gibbs free energy reduction per mole of oxygen during oxidation is less than that of Cr; an aluminum-rich layer containing at least 30 wt. % of aluminium formed on the surface diffusion layer, and a zinc plating layer formed on the aluminum-rich layer. In this way, a metal having a low affinity for oxygen is coated to an effective thickness prior to annealing and thus the creation of annealing oxides at the surface of the steel sheet is suppressed and a uniform zinc plating layer is formed, and alloying of the zinc plating layer is promoted during press-processing heat treatment. Cracking in the steel foundation plate during hot press molding is prevented.

The invention discloses an aluminum alloy composite material and a preparation method thereof. The aluminum alloy composite material is prepared from the following components in parts by weight: 89-93 parts of aluminum, 4-6 parts of iron, 3-6 parts of manganese dioxide, 3-5 parts of magnesium, 1-2 parts of titanium dioxide fibers, 1-1.5 parts of tin, 0.5-1 part of tungsten carbide, 0.05-1 part of zinc oxide and 0.05-0.1 part of graphene nanosheets. The invention also provides a method for preparing the material. The method comprises the following steps: (1) weighing the following components in parts by weight: 89-93 parts of aluminum, 4-6 parts of iron, 3-6 parts of manganese dioxide, 3-5 parts of magnesium, 0.05-1 part of zinc oxide, 0.05-0.1 part of graphene nanosheets and 0-0.5 part of vanadium pentoxide, heating to the temperature of 660-690 DEG C under an inert atmosphere, and uniformly mixing; (2) adding 0.5-1 weight part of tungsten carbide subjected to ball milling into the product in the step 1 under the inert atmosphere, and heating to the temperature of 1100-1200 DEG C; and (3) sequentially adding 1-2 weight parts of titanium dioxide fibers and 1-1.5 parts of tin into the product in the step 2 under the inert atmosphere, preserving the temperature at the temperature of 800 DEG C for 0.5-2 hours, removing the slag, and degassing, thereby obtaining the aluminum alloy composite material.

The invention relates to a preparation method of an amorphous nickel-tungsten alloy coating layer. The method combines ultrasonic wave with direct current, and uses a synergistic effect of the two to perform electroplating for preparing the amorphous nickel-tungsten alloy coating layer. Compared with the prior art, the method uses the ultrasonic wave to passivate defects of the coating layer, and accelerates solute mixing to promote alloying of nickel and tungsten; the device structure is simple; the easily-controlled direct current is adopted in the electroplating process; and the method can prepare the amorphous nickel-tungsten alloy coating layer with excellent surface quality. The method can improve the production efficiency of the amorphous nickel-tungsten alloy coating layer, reduces the production and operation costs, and has excellent application prospect.

The present invention provides an alloyed molten zinc plated steel sheet having an area of the Fe and Zn alloy phase in the unformed parts in the plating layer of less than 10% of the area of the steel sheet as a whole and superior in strength and shapeability and a method of producing this alloyed molten zinc plating steel sheet by a continuous zinc plating production system which enables production at a low cost without modification of the system or addition of steps, said alloyed molten zinc plated steel sheet characterized by comprising a steel sheet including C: 0.05 to 0.40%, Si: 0.2 to 3.0%, and Mn: 0.1 to 2.5%, the balance comprised of Fe and unavoidable impurities, having on its surface a Zn alloy plating layer comprised of Fe in a concentration of 7 to 15 wt %, Al in a concentration of 0.01 to 1 wt %, and the balance of Zn and unavoidable impurities, said plating layer containing oxide particles of at least one type of oxide selected from an Al oxide, Si oxide, Mn oxide, and complex oxides of the same alone or in combination.

The invention relates to a preparation process of powder metallurgy material, in particular to high-performance copper-diamond electrical contact material and a preparation process thereof. The high-performance copper-diamond electrical contact material comprises the following raw materials by weight percentage: 0.001%-5.0% of diamond powder and 95%-99.999% of copper alloy powder, wherein the grain size of the diamond powder is 0.1-15 mum, and the surface of the diamond powder is coated with copper. The preparation process of the high-performance copper-diamond electrical contact material comprises the following steps: (1) preparing the raw materials: preparing the copper alloy powder by using a high-pressure spray method, preparing the copper-coated diamond powder by using a liquid-phase reduction method and mixing the copper alloy powder and the copper-coated diamond powder; (2) preparing the electrical contact material: firstly, carrying out thermal diffusion treatment to the mixture of the copper alloy powder and the copper-coated diamond powder, sintering the compressed and moulded mixture in vacuum, and thermally extruding and moulding the mixture; and (3) preparing electrical contact sectional material: rolling or drawing and machining the copper-diamond electric contact into the required-size sectional material.

The invention relates to a high-performance copper alloy prepared by a casting method, and belongs to the field of copper alloys. The copper alloy comprises Cu, Cr, Zr and M, wherein the mass percentof the Cr is 0.1-5.0%, and the mass percent of the Zr is 0.1-5.0%; the M is composed of RE and at least two of Mg, Ag, B, Ga, Si, Li, Ti, Fe and Mn; the RE is selected from at least three of Ce, La, Yb, Pr, Nd and Sm; and the mass ratio of the M in the high-performance copper alloy is 0.05-0.5%. The high-performance copper alloy is subjected to casting to obtain an as-cast alloy ingot, and the as-cast alloy ingot is subjected to heat treatment and deformation treatment to obtain a finished product with excellent mechanical properties and electrical conductivity.

The invention relates to a double-wire underwater wet welding device and a double-wire underwater wet welding method. The welding device comprises a master welding gun power supply, a slave welding gun power supply, a master wire conveyor, a slave wire conveyor, a master welding gun and a slave welding gun, wherein the master welding gun and the slave welding gun are respectively connected to the master welding gun power supply and a slave welding gun power supply, a master welding wire and a slave welding wire are respectively conveyed to the end parts of the master and slave welding guns through the master and slave wire conveyors, the master welding gun and the slave welding gun are respectively arranged to form a certain angle with a workpiece to be welded, and a certain distance is kept between the front end of the master welding gun and the front end of the slave welding gun. According to the double-wire underwater wet welding device and method, the two welding wires in the master and slave welding guns are heated mutually, and the energy of electric arc is fully used, so that the deposition rate is greatly improved, and the problem that the underwater wet welding molten bath and the base metal cannot be fully fused is overcome.

The invention discloses a lanthanum cerium-magnesium intermediate alloy and a production method thereof, relating to the technical field of preparation of a rare earth-magnesium intermediate alloy product. According to the production method, a coelectrodeposition method is adopted, a graphite crucible is used as an electrolytic tank and an anode, a molybdenum bar is used as a cathode, a magnesium oxide crucible is used as an alloy supporting device, an electrolyte is formed by mixing KCl, anhydrous MgCl2 and RECl3 together. By adopting the preparation method disclosed by the invention, the lanthanum cerium-magnesium intermediate alloy high in quality and low in cost can be produced through one step by adopting magnesium and rare earth compounds through the coelectrodeposition method. The process indicators of the whole production process are relatively high, wherein the average electric efficiency reaches 65-75% and more than 85% at the maximum, the rare earth direct yield is more than 85%, and the magnesium direct yield is more than 95%. The lanthanum cerium-magnesium intermediate alloy prepared by the invention is lowest in price, and resources can be continuously supplied to promote sustainable development of rare earth-magnesium alloys.

A production method of a Zn/Cu-Ag/Cu-Au composite coating steel band for a photoelectric material comprises the following steps: using a 08Al cold-rolled steel sheet as a raw material and carrying out cold rolling; after conventional degreasing, carrying out uncoiling, splitting and deburring; hot-dipping Zn; thermally spraying Cu-Ag; carrying out primary annealing at a pure nitrogen protective atmosphere; thermally spraying Cu-Au; carrying out secondary annealing at a pure nitrogen protective atmosphere; and air-cooling to a room temperature and coiling. The tensile strength is 250-300MPa, and the elongation percent is 42-48%. One Zn/Cu-Ag/Cu-Au composite coating is generated on the surface. After the Zn/Cu-Ag/Cu-Au composite coating steel band is placed under an indoor conventional atmospheric condition for 960 days, the gloss loss rate of the coating is not larger than 0.3%, and the surface corroded area is not larger than 0.3%. The product has excellent electricity and heat conductivity. After the Zn/Cu-Ag/Cu-Au composite coating steel band is kept at 300-350 DEG C for 960 days, the surface oxidized area is not larger than 0.2%, and the hardness variation rate is not larger than 0.2%. The product also has excellent welding and machining performance.

The invention discloses a powder metallurgy high-speed steel valve seat for a clean fuel engine and a production process of the powder metallurgy high-speed steel valve seat. With W6Mo5Cr4V2 high-speed steel powder as a base body material, Cu, Co-Cr-Mo and Fe-Mo hard particles are added, and the hard particles comprise, by mass percentage, 45%-57% of W6Mo5Cr4V2, 13%-17% of Co-Cr-Mo, 4%-7% of Fe-Mo, 17%-22% of Cu and 2%-3% of a solid lubricant and easy-to-cut components. According to the powder metallurgy high-speed steel valve seat, by the adoption of an infiltration sintering and heat treatment technology, the density of the powder metallurgy high-speed steel valve seat is increased, the hardness, wear resistance and the like of the powder metallurgy high-speed steel valve seat are improved; and on the one hand, stable alloy tempered martensite and fine dispersed secondary alloy carbide can be obtained, and on the other hand, the bonding of a base body and the hard particles is firmer, and the hard particles are not likely to be peeled off from the base body during frictional wear. By the adoption of the infiltration sintering and heat treatment technology, the density of the material is increased, and the hardness, wear resistance and the like of the material are improved.

The invention discloses a PVC (polyvinyl chloride)/styrene polymer alloy. The alloy is characterized by being prepared from the following raw materials in percentage by weight: 50-95% of PVC resin, 3-30% of styrene polymer, 0.2-6% of catalyst, 0-10% of addition agent and 1.5-4% of heat stabilizer. Besides, the invention also discloses a preparation method of the PVC/styrene polymer alloy. The PVC/styrene polymer alloy material has the following advantages: not only are the defects of the existing extra compatilizer overcome, but also the alloying of PVC and styrene polymer is simpler and more convenient; anhydrous aluminium chloride, anhydrous ferric chloride or anhydrous stannic tetrachloride is taken as the catalyst; the reaction mixing/extrusion in-situ compatibilization technology is adopted, thus realizing the blending of PVC and styrene polymer; and the polymer alloy material can improve the flame retardance of the styrene polymer while reinforcing and toughening the PVC, and has industrial application prospects.

A metallurgy method for producing titanium alloy powder for producing golf bar heads is disclosed, pertaining to preparing method of titanium alloy for golf bar heads. The method uses Ti powder and additive powder containing Al, V, Fe, and Mo elements as raw materials, mixes the Ti powder with a certain granularity proportion and the additive powder with a certain component range evenly, prepares slice blank by using a die forming mode, uses a multi-stage heating technique giving priority to middle-low temperature quick heating and high temperature slow heating during sinter process, performs quenching immediately after the heating process is completed, thereby prepares the Ti alloy sintering blank, and the titanium alloy material for producing golf bar head is finally produced by forge work and subsequent anneal process. Since the powder metallurgy technique has the characteristics of near net shape and easily control components, alloying is realized easily. At the same time, the high-usage of raw material is provided, the raw material cost and processing cost are saved, and the production energy consumption is reduced greatly. The method is suitable for producing titanium alloy material for producing golf bar heads.

The invention relates to a high-performance copper alloy, and belongs to the field of copper alloy materials and powder metallurgy. The copper alloy comprises Cu, Cr, Zr and M according to the mass percentages of 0.1% to 5.0% of Cr, 0.1% to 5.0% of Zr, and 0.05% to 0.5% of M. M is composed of Re and at least two elements of Mg, Ag, B, Ga, Si, Li, Ti, Fe and Mn. RE is composed of at least three elements of Ce, La, Yb, Pr, Nd and Sm. According to the high-performance copper alloy, the Cu-Cr-Zr-M copper powder is prepared by adopting a gas atomization technology, a supersaturated solid solution with uniform ingredients and fine microstructures is obtained, then the powder is subjected to extrusion molding with a powder sheath and heat treatment, and the Cu-Cr-Zr-M copper powder with excellentperformance is prepared. The high-performance copper alloy is reasonable in component designing, and simple and controllable in preparation technology, a product is good in performance, and large-scale industrial application is facilitated.

The invention discloses a method for conducting boron alloying in the electro-slag remelting process and relates to the technical field of electro-slag remelting. In the electro-slag remelting process, after a metal consumable electrode is inserted into a slag bath and starts remelting, boron-contained alloy composed of Al-B-Fe is added to the slag bath, and then boron alloying is conducted on steel of metal consumable electrode. The boron alloy is added into the slag bath, so that Al in the boron-contained alloy can locally conduct targeted deoxidation around the B element, it is avoided thatthe B element is oxidized in the adding process, and therefore the final yield of the B element is improved; in addition, after the boron-contained alloy composed of the Al-B-Fe is added, the boron-contained alloy can rapidly pass across the slag bath to float between interfaces of the slag bath and a melting bath, on one hand, doping can be avoided, and on the other hand, rapid alloying of molten steel is facilitated.

The invention belongs to the technical field of fuel cells, and particularly relates to a preparation method of a dual-element or multi-element noble metal catalyst for a fuel cell. One or more transition metal components are introduced into noble metal, and the noble metal and the transition metal are alloyed, so that the oxygen reduction activity of the alloyed cathode is higher than that of single-component noble metal, and the loading capacity of the noble metal can be reduced; and the spherical porous activated carbon is adopted, more active sites can be exposed out of the catalyst due tothe large specific surface area of the spherical porous activated carbon, and the prepared nano-alloy particles are all concentrated on the surface of the carbon carrier, so that the utilization rateof the catalyst can be increased. In the preparation process, one or more precursor solutions form sol-gel, and macromolecular citric acid and metal ions are complexed to form a whole, so that nano-alloy particles can be prevented from being embedded into internal pores of activated carbon, alloying of the nano-alloy particles can be improved, and the performance of the catalyst is improved.

The invention discloses a lead-calcium alloy for a positive grid, and a preparation method thereof. The lead-calcium alloy is prepared from the following components: calcium, aluminum, tin, bismuth, rare earth, modified graphene and the balance lead. The lead-calcium alloy for the positive grid is high in corrosion resistance and tensile strength, and the service life of a storage battery can be effectively prolonged; according to the lead-calcium alloy, the content of the calcium in the lead-calcium alloy is controlled to be 0.09%-0.096%, and the anti-corrosion effect can be remarkably improved; when the content of the calcium is 0.094%, the anti-corrosion effect is optimal; when the content of the calcium is higher than 0.096%, in the using process, the growth speed in the length-width direction is increased, the corrosion speed of the alloy is increased, and accordingly the service life of a battery is shortened; when the content of the calcium is lower than 0.09%, the internal crystal structure of the alloy is thickened, and the intercrystalline corrosion speed is increased; and the positive grid can be rotted and broken more quickly in the use process, and consequently the service life of the battery is shortened.