215results about How to "Uniform and dense tissue" patented technology

The invention provides a forming device and method of an aluminum-based silicon carbide particle reinforced composite material and a member thereof. The forming device comprises a laser system, a powder spreading system, an inert atmosphere system and a control system. By using the forming device, quick formation of the aluminum-based silicon carbide particle reinforced composite material and the member thereof can be realized. The forming method provided by the invention is simple, and adopts digitized manufacturing. The formed product is compact and uniform in texture, and any complicated members can be directly manufactured without being secondarily processed.

The invention relates to an electroslag remelting method for difficult-processing high alloy stainless steel and an electroslag remelting slag system adopting the electroslag remelting method. The slag system comprises the components in parts by weight: 46-72 parts of CaF2, 15-28 parts of CaO, 24-10 parts of Al2O3 and 8-2 parts of MgO, wherein the content of impurities is less than 1.0%. The electroslag remelting slag system and the electroslag remelting method reduce the contents of harmful elements in steel, improve the purity, optimize the organization, particularly and remarkably improve the processing performance of the difficult-processing high alloy stainless steel and greatly improve the material yield.

The invention belongs to the field of electrochemical process technology and relates to a selective metal electro-deposition device and application thereof. The metal electro-deposition device is characterized by comprising a liquid storage tank for containing electrolyte, a power supply namely an ultrasonic power supply electrically connected with a cathode and an anode correspondingly in electro-deposition process, an ultrasonic assistant jet apparatus supported by a rack and a three-dimensional numerical control platform which comprises a motion actuator, the rack and a computer, wherein the liquid storage tank is also externally provided with a peristaltic pump for supplying jet pressure for the electrolyte and a control valve for controlling the flow of the electrolyte, the liquid storage tank is internally provided with a temperature controller for keeping the temperature of the electrolyte, and an electrolyte nozzle is arranged at the bottom of the ultrasonic assistant jet apparatus. The selective metal electro-deposition device can improve the hardness, compactness and electro-deposition speed of a settled layer in the existing electro-deposition technology, lower the residual stress of a clad layer, and realize the selectivity of an electro-deposition area and the electro-deposition forming of parts of simple shape.

The invention discloses a method for preparing an Al0.5CoCrFeNi high-entropy alloy. An intermediate alloy serves as a raw material, and volatilization of a low-melting-point element Al in the smelting process is greatly reduced. Meanwhile, a vacuum induction heating device is adopted, the electromagnetic stirring effect of the induction heating device is utilized, and therefore the component uniformity of a cast ingot is guaranteed. According to the method, the melting point difference between the lowest-melting-point metal Al and the highest-melting-point metal Cr is indirectly reduced, the problem of excessive volatilization of the low-melting-point Al simple substance in the smelting process is solved, and the component uniformity of the multi-element high-entropy alloy is guaranteed through the electromagnetic stirring effect existing in induction heating. Through reasonable designing of the atmosphere, the air pressure, the die preheating temperature, the smelting temperature, the heat preservation time, the casting speed and other parameters in the smelting process, a large Al0.5CoCrFeNi high-entropy alloy cast ingot is successfully prepared.

The invention provides a method for preparing a tungsten copper alloy. The preparation method comprises the steps of preparing tungsten and copper mixed powder into a briquet for presintering, and hot-pressing the briquet at a temperature lower than a melting point of copper. The tungsten copper alloy prepared by the preparation method is uniform in texture, high in density, excellent in performance and high in rate of finished products.

The invention relates to the technical field of high-entropy alloy, in particular to a high-entropy alloy double technology preparation method. The high-entropy alloy double technology preparation method comprises the steps that firstly, types of four welding wires and components, contents, existence forms and existence positions of welding wire elements are decomposed and designed according to the element components, contents and physico-chemical properties of high-entropy alloy needing to be prepared, and the welding wires are prepared; secondly, an integrated four-wire pulse gas shielded welding technology is adopted to cooperate with additional materials to manufacture the high-entropy alloy; and finally, a vacuum self-consumption remelting technology is adopted to refine the high-entropy alloy. According to the high-entropy alloy double technology preparation method provided by the invention, the technology is stable, the preparation efficiency is high, the cost is low, the heat input adjusting range is wide, the optional alloy element range is wide, the quantity of types of prepared high-entropy alloy is large, alloy component adjusting is convenient and accurately controllable, chemical components are uniform, the structure is compact and uniform, the degree of purity is high, and the inner quality is good.

The present invention discloses a titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating; an Al-rich deposition layer, an Al-Cr alloy layer and a Cr diffusion layer are successively arranged from surface to a titanium aluminum alloy substrate. The content of Al in the Al-rich deposition layer remains the same. The content of Al in the Al-Cr alloy layer gradually reduces outside-to-inside to 70%-100% of the content of Al in the titanium aluminum alloy substrate, and the rest in the Al-Cr alloy layer is Cr. The contents of Cr and Al in the Cr diffusion layer respectively gradually reduces outside-to-inside to same as the contents of Cr and Al in the titanium aluminum alloy substrate, and the rest in the Cr diffusion layer is other elements in the titanium aluminum alloy substrate, and the contents of other elements in the Cr diffusion layer respectively gradually rise to same as the contents of the other elements in the titanium aluminum alloy substrate from zero. The invention also discloses a preparation method of the titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating; the titanium aluminum alloy surface high temperature oxidation and hot corrosion resistant Al-Cr coating can give titanium aluminum alloy excellent oxidation resistance and heat resistance corrosion performance under high temperature and long term service conditions, and due to the presence of the diffusion layer of the gradient components, the reliable binding strength and excellent thermal shock resistance can be realized.

The invention belongs to the field of heat conduction materials, and specifically discloses a preparation method of a copper based graphene composite with high heat conductivity. According to the preparation method, a novel sediment composition is used for direct-current electrodeposition, a certain quantity of additives are added to sediments, and the reasonable electrodeposition frequency is selected to prepare the novel copper based graphene composite with high strength and high heat conductivity. According to the copper based graphene composite prepared by using an electrodeposition preparation technique, the heat conductivity can reach 390 to 1112 W/m.k, the tensile strength reaches 300 to 450 MPa, and the application to the field of heat conduction can be met.

Provided are a cobalt-based alloy and a cladding layer prepared from the cobalt-based alloy. The cobalt-based alloy comprises Co, Ni, Cr, Fe, Si, W, C and Al. The cobalt-based alloy is specifically prepared from, by weight, 19-22.5% of Ni, 18-19.5% of Cr, 7.5-10.5% of Al, 0.8-1.1% of Fe, 0.7-1.0% of Si, 3.0-4.4% of W, 0.6-0.9% of C, and the balance Co and smaller than 0.1% of inevitable impurities, and the mass percent of Ni and Co is greater than 0.4 but smaller than 0.56, and the mass percent of Ni and Al is greater than 2 but smaller than 2.7. The cobalt-based alloy can be used for preparing the cladding layer with high abrasion resistance performance and heat fatigue resistance performance, and the cladding layer not only can be used for repairing and enhancing a friction layer of a brake disc, but also can be used as the friction layer of the brake disc and a protection layer on the surface of other metal materials needing to bear repeated heat impact and having friction abrasion in the environments like mold cavity linings, engine pistons and inner cylinders, petroleum pipeline valve inner walls.

The invention belongs to the technical field of ship tail shaft bracket manufacturing technologies, and discloses a ship tail shaft bracket electric arc wire fusing 3D printing manufacturing method. The method comprises the steps that (1) a corresponding three-dimensional model is built for a tail shaft bracket and is divided into three partitions corresponding to a tail shaft hub, a transverse arm and a supporting arm; (2) according to the different partitions, printing paths are planned and designed based on different principles, and a tail shaft hub printing path with all layers in ring shapes, a transverse arm printing path with all layers in rectangle shapes and a supporting arm printing path with all layers in rectangle shapes are obtained; and (3) according to the obtained differentmanufacturing paths, the electric arc wire fusing 3D printing manufacturing technology is adopted for conducting corresponding molding machining. The invention further discloses a corresponding shiptail shaft bracket product. By means of the method and the product, the problems that in the traditional ship tail shaft bracket manufacturing process, a die model is difficult, and the molding pieceperformance is poor are solved, and a new method and thinking are provided for manufacturing the tail shaft bracket.

The invention provides a rare earth yttrium doped molybdenum disulfide self-lubricating composite coating and a preparation method thereof. Specifically, the molybdenum disulfide self-lubricating composite coating is doped with rare earth yttrium, wherein the molar content of yttrium in the composite coating is 0.1%-5% according to the total molar content of the composite coating. According to themolybdenum disulfide self-lubricating composite coating, sublimed sulfur, yttrium chloride hexahydrate and molybdenum trioxide are adopted as raw materials, and the rare earth yttrium doped molybdenum disulfide self-lubricating composite coating is prepared through the chemical vapor deposition method. The molybdenum disulfide self-lubricating composite coating has good wear resistance and self-lubrication and excellent winding plating property. Coating deposition can be conducted on large-size complex workpieces of a complex shape.

The invention relates to a squeeze casting preparation method for a magnalium automobile engine support. Magnalium comprises the following raw material components by weight percent: 3.5-5.5% of Si, 1-2.5% of Fe, 0.5-2% of Ti, 0.15-0.25% of Cu, 0.01-0.05% of Mn, 10.2-15.5% of Mg, less than 0.1% of Zn, less than 0.05% of Ni, less than 0.05% of Pb, less than 0.05% of Sn and the balance of Al, wherein Fe/Ti is more than 1 and less than 2. The squeeze casting preparation method comprises the following steps: preheating the raw material components at 320-345 DEG C, and then, adding into a heated crucible melting furnace; and continually heating to 500-600 DEG C, then pumping in argon, after that, heating to 760-780 DEG C, transferring into a crane ladle, performing heat preservation, refining, casting, and then conducting solution and aging strengthening to obtain the automobile engine support with superior mechanical property. The prepared automobile engine support has the tensile strength of 320 MPa or above and the yield strength of 100-110 MPa.

A forging method for producing a 21-10Mn7Mo welding wire and a blank forged by the method belong to the technical field of welding, relate to the production of a solid welding wire used for gas-shielded arc welding, a forging method, a component forged by the method and a hot-rolling technology and further relate to a steel ingot and the smelting thereof. The forged blank comprises the following chemical components in a percent by mass: smaller than or equal to 0.10 of C, smaller than or equal to 0.8 of Si, 5.5-8.0 of Mn, smaller than or equal to 0.030 of P, smaller than or equal to 0.020 of S, 9.0-11.0 of Ni, 19.0-22.0 of Cr and 0.5-2.0 of Mo, wherein the ratio of Mn to Mo is controlled between 7 and 7.5. The forging step adopted for producing the forged blank comprises the step of heating a blank, and forging temperature is controlled in a way that initial forging temperature is higher than or equal to 1180 DEG C and final forging temperature is higher than or equal to 850 DEG C. The smelting step of a forged steel ingot comprises the technical step of using an electric-arc furnace return oxygen blowing process to smelt an electroslag re-melted electrode.

The invention relates to the technical field of additional material manufacturing and discloses a laser deposition additional material manufacturing method. The scanning manner of carrying out negative lap joint, carrying out S-shaped scanning and then carrying out reverse S-shaped scanning is adopted, and the lap joint rate is controlled within 30%-40%. Metal powder used for manufacturing a laserdeposition additional material contains active powder, defects of holes, cracks and the like in the titanium alloy laser deposition process can be eliminated, and a manufactured titanium alloy component is uniform and compact in internal texture and smooth in appearance.

The invention discloses a preparation method used for laser 3D printing metal ceramic composite powder, and belongs to the field of preparation of powder materials for laser 3D printing. Through the physical method, pure Ti powder and pure B4C powder particles are coated (or bonded) according to the mass ratio of 2.6:1, drying and ball grinding crushing treatment are carried out in sequence, and aTi/B4C composite powder material is prepared; and then the powder material and AlSi1-Mg powder are added into a ball grinder to be subjected to vacuum ball grinding, and finally the evenly-mixed powder for the laser 3D printing metal ceramic composite is prepared. By means of the preparation method, the technical problem that in the 3D printing process of an existing metal ceramic composite, dualwild phases cannot be synthesized is solved, the reaction rate of Ti and B4C particles in the laser 3D printing process is increased, and the content of a ceramic wild phase in the dual-phase composite is increased; and the prepared composite powder can be used for laser near-net forming or selective laser melting and other high-energy beam 3D printing processes.

The invention relates to corrosion-resistant rare earth bearing steel and a preparation method of the corrosion-resistant rare earth bearing steel. The corrosion-resistant rare earth bearing steel comprises the following components of, by weight percentage, 0.90-1.10wt% of C, 0.20-0.40wt% of Si, 0.20-0.50wt% of Mn, 1.35-1.70wt% of Cr, 0.12-0.26wt% of Cu, 0.015-0.035wt% of Alt, P<=0.020wt%, S<=0.010wt%, 0.003-0.005wt% of a rare earth alloy, and the balance of Fe and inevitable impurities. By adding trace rare earth, the sizes of inclusions are refined, the number of the inclusions is reduced, and the fatigue life of the bearing steel is remarkably prolonged; and meanwhile by adding the element Cu, the corrosion resistance of the bearing steel is improved, and the surface quality of thebearing steel is remarkably improved.