438results about How to "Solve Oxidation Problems" patented technology

The invention relates to a preparation method of a stainless steel-carbon steel composite board, which belongs to the technical field of material and comprises the following steps: (1) removing and cleaning rusted layers and oxidative layers of stainless steel board material and carbon steel board material; (2) alternately stacking the stainless steel board material and the carbon steel board material; (3) arranging a composite blank between two metal panels to constitute a clamped composite blank, or welding two composite blanks together by electric welding to constitute a combined structure of the composite blank, a blocker and the composite blank, and arranging the combined structure between two metal panels to constitute a clamped composite blank; (4) welding the peripheries of contact surfaces of two adjacent steel boards under a vacuum condition; (5) arranging the composite board in a resistor furnace for heating and heat preservation; and (6) rolling the composite board by a rolling mill. The method disclosed by the invention prolongs the service life and enlarges the application scope of the stainless steel-carbon steel composite board. Compared with an explosive compounding method, the method causes small environmental pollution, and has low requirements on the production environment, in addition, the shape of the board is flat, and the product yield is high.

The invention discloses a production method of an aluminum and copper composite metal band. In the method, the aluminum and copper composite metal band is manufactured by anaerobic continuous casting and rolling of semisolid aluminum or aluminum alloy and a solid copper band. In the production method of the invention, the anaerobic metallurgical combination of the solid copper band and molten aluminum is realized, the aluminum oxidization problem is solved, the combined strength is high, and the aluminum and copper bonding strength is more than or equal to 100MPa; the continuous casting and rolling of the copper band and the molten aluminum are adopted to produce the aluminum and copper composite metal band, so the production efficiency is greatly improved by scores of times and the product quality is stable; the produced aluminum and copper composite metal band retains the original surface quality of the copper band, has a uniformly-thick copper layer and can be deeply processed by cold rolling; and the copper band and the molten aluminum, which comprise different components, can be used, and products are diversified and widely applicable. The method has the advantages that: the production process of the copper and aluminum composite band is advanced and comprises a few working procedures; and the energy-saving, material-saving and economic effects are obvious.

The invention discloses tin-doped silver-wrapped base metal slurry of a back electrode of a solar cell, and a preparation method of the tin-doped silver-wrapped base metal slurry. The tin-doped silver-wrapped base metal slurry comprises an adhesive, silver-containing powder and a diluent, wherein the silver-containing powder is formed by mixing silver powder, tin powder, silver-wrapped base metal powder and glass powder; and the silver-wrapped base metal powder refers to at least one of silver-wrapped nickel powder and silver-wrapped copper powder. By replacing part of pure silver powder by the silver-wrapped base metal powder, the problem of oxidation of pure base metal slurry in a sintering process of a cell piece can be solved, and the problems of high price and easiness in displacement of the pure silver powder can be solved; and furthermore, the tin powder is added into the slurry, so that the weldability and the adhesive force of the slurry are improved. Therefore, the tin-doped silver-wrapped base metal slurry is low in cost, adopts the simple preparation method, is suitable for industrial production, and has the advantages of low contact resistance, high cell conversion efficiency and high weldability and adhesive force.

The invention discloses an intermediate temperature glass-metallic structure solar vacuum thermal-collecting tube, which belongs to the technical field of solar utilization, wherein a layer of temperature-resistant anti-oxidation film is plated on the outer surface of a heat-transfer pipe provided with a heat-conductive wing in the intermediate temperature glass-metallic solar vacuum thermal-collecting tube, and the film layer is aluminum or zinc or nickel or chromium or stainless steel; the heat-conductive wing is a thin aluminum plate which is coiled into the shape of an opening cylinder or a semicircular cylinder, and is tightly connected or welded with a U-shaped copper tube or a copper heat pipe of the temperature-resistant anti-oxidation film; and a heat-conductive wing tube is arranged inside the all-glass solar vacuum thermal-collecting tube, and closely contacts the inner wall of the all-glass solar vacuum thermal-collecting tube. A non-evaporable getter can be arranged inside a vacuum interlayer of the all-glass solar vacuum thermal-collecting tube, thereby improving the vacuum service life of the all-glass solar vacuum thermal-collecting tube after the long-term operating temperature is extended to more than 140 DEG C. The invention is a novel intermediate temperature glass-metallic solar vacuum thermal-collecting tube with high cost performance, and can meet the requirements of solar air-conditioners and industrial heat.

The invention provides a martensite precipitation hardening stainless steel for structural member and a manufacturing method thereof. The martensite precipitation hardening stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.05 percent of C, 13.50 to 15.50 percent of Cr, 2.5 to 4.0 percent of Cu, 3.0 to 5.0 percent of Ni, 0.15 to 0.40 percent of Nb and Ta, 0.010 to 0.040 percent of N, 0.050 to 0.15 percent of V, less than or equal to 0.80 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe and inevitable impurities. The stainless steel is smelted by combining an electric furnace, AOD refining and vacuum self-consuming technology, so the stainless steel has the characteristics of high strength, good plasticity, good corrosion resistance and the like, and can meet the requirements of high-strength components such as high-pressure values, oil drill, efficient heavy-duty machinery and the like on material performance.

The invention relates to a solar spectrum selective absorbing coating which is prepared by adopting magnetron sputtering technology. The absorber of the coating comprises the following three layers of films from substrate to top: a first layer adopts copper with infrared reflectivity or aluminium substrate as an infrared reflecting layer; a second layer uses a metalloid layer and a medium type layer which have different refractive indexes and thicknesses; and a third layer uses SiON film as an antireflection layer. The preparation method comprises the following steps: the first layer (infrared reflecting layer): cleaning copper or aluminium sheets with ultrasonic wave or polishing the copper or aluminium sheets; the metalloid layer of second layer: using two metals as alloy target, argon gas as sputtering gas and nitrogen gas as reaction gas and adopting DC electrical source to perform reactive sputtering; the medium type layer of the second layer: using two metals as alloy target, argon gas as sputtering gas and nitrogen and oxygen gas as reaction gas and adopting DC electrical source to perform reactive sputtering; the third layer (antireflection layer): uses SiN as target, argon gas as sputtering gas and nitrogen and oxygen gas as reaction gas and adopting radio frequency power source to perform reactive sputtering; and finally obtaining the absorber.

The invention discloses an additive manufacturing method for a multi-material heterogeneous part. The additive manufacturing method for the multi-material heterogeneous part comprises the following steps that A, alloy powder is formed into forming layers through electron beam or laser selective melting, and the alloy powder comprises at least two elements, the elements are different in saturated vapor pressure and in volatilization degree; in the electron beam or laser selective melting process, different kinds of electron beam or laser energy are applied to different areas of each forming layer and/or the different forming layers, and the elements contained in the alloy powder are volatilized at the different degrees so that alloy with the different element contents can be obtained in the different areas and/or on the different forming layers; and B, the multiple forming layers and the different areas of the forming layers are subjected to fusion and stacking layer by layer, and finally the heterogeneous gradient part with the element component being in a three-dimensional change mode is obtained. The additive manufacturing method has the advantages of being simple in process, convenient to carry out, low in implementing cost and equipment requirement and the like.

The invention discloses a dihydromyricetin cyclodextrin inclusion compound, which comprises cyclodextrin and dihydromyricetin, wherein the dihydromyricetin is embedded into a cyclodextrin cavity; and the inclusion compound employing the cyclodextrin as a host molecule and dihydromyricetin as a guest molecule is formed. The dihydromyricetin cyclodextrin inclusion compound has the beneficial effects that 1 the dihydromyricetin cyclodextrin inclusion compound is embedded by the cyclodextrin, and the solubility, the stability and the bioavailability of the dihydromyricetin are improved; 2 the preparation method of the dihydromyricetin cyclodextrin inclusion compound disclosed by the invention is simple in process and suitable for industrialized production; 3 a spray drying process is adopted, the process from spray drying to dust collection is finished within 20 seconds, the problem of product oxidation in the drying process is avoided, the method is simple in process, simple and convenient to operate; the production conditions are easy to control, and the inclusion rate of the dihydromyricetin is high; and 4 the dihydromyricetin used by the dihydromyricetin cyclodextrin inclusion compound is extracted from vitaceae ampelopsis, and the dihydromyricetin in the vitaceae ampelopsis is high in content, and is a natural substance and free of toxicity.

The invention relates to a plaster casting method for a large-sized complex thin-walled magnesium alloy part. The method comprises the following steps of coating the surface of an assembled form with a coating in situ, and arranging shapeless cold iron on a hot spot part, wherein a mixture for manufacturing the shapeless cold iron comprises the following components in percentage by mass: 1.25 percent of phenolic resin, 0.4 percent of toluenesulfonic acid, 1 to 1.5 percent of boric acid, 2 percent of bentonite and the balance of 70 to 140-mesh chromite sand; pouring a casting in an adjustable pressure casting device, arranging a plaster mold poured by the form at the casting position of the adjustable pressure casting device, filling a tank with dry air or a CO2 atmosphere with SF6 content of 0.1 to 1.0 percent, and performing vacuum casting and pressurized solidification, wherein the casting temperature is 710 to 750 DEG C, vacuum degree for primary mold filling is minus 0.6Mpa to minus 0.8Mpa, and the solidification pressure is 0.020 to 0.025Mpa. According to the method, oxidization can be prevented, the mold filling capability can be improved, shrinkage cavities and shrinkage porosities in the casting are reduced, and the obtained magnesium alloy casting is higher in density.

The invention provides a non-vacuum solar spectrum selective absorption film and a preparation method thereof. The absorption film comprises a stainless steel or copper substrate which is successivelyprovided with a titanium-aluminum film, a titanium-aluminum-nitrogen film, a titanium-aluminum-oxygen-nitrogen film and a titanium-aluminum-oxygen film from inside to outside, wherein the films are prepared by adopting multi-arc ion plating; a target material adopts titanium-aluminum alloy target of which the atomic ratio of titanium to aluminum is 50:50; and the content of nitrogen and/or oxygenin the films is controlled by controlling the flow of argon, nitrogen and oxygen in the atmosphere of multi-arc ion plating. The method comprises: (1) selecting and cleaning a substrate material; (2)baking the substrate material in a vacuum sputtering chamber of a multi-target compound coating machine; (3) performing argon-ion bombardment on the surface of the substrate material; (4) coating thesubstrate material; and (5) performing annealing treatment. The absorption film has the advantages of high absorptivity alpha in a solar spectral range (0.3 to 2.5 microns), low emissivity epsilon inan infrared region (2 to 50 microns) and the characteristic of resisting high-temperature oxidation, thereby meeting the requirements of solar high-temperature utilization.

The invention relates to a low-pressure casting filling method comprising the steps of arranging a reducing sleeve arranged on an upper port of a riser tube (10), guiding magnesium alloy liquid from the riser tube (10) to a cast through the reducing sleeve; arranging a protective gas inlet on the reducing tube, and enabling the protective gas into the space above the magnesium alloy liquid in the riser tube (10) for protecting the magnesium alloy liquid in the riser tube (10) and reducing oxidation. The a low-pressure casting filling method uses a low-pressure casting filling device which includes the reducing sleeve composed of an upper part (1) of the reducing sleeve, a lower part of the reducing sleeve; wherein a magnesium alloy liquid sensor mounting hole (10) is arranged on a lower side wall of the lower part of the reducing sleeve; a plurality of subsize air suctions with enough section width are arranged on a joint face of the upper part (1) and the lower part (8) of the reducing sleeve, and the air suctions are slit structures with rectangular sections. The low-pressure casting filling method of the invention can obviously reduce the oxidation of the magnesium liquid in the riser tube and improve the quality of a magnesium alloy low-pressure casting member.

The invention discloses a laser additive repair method for a titanium alloy valve rod. The laser additive repair method for the titanium alloy valve rod comprises the following steps: optimizing parameters and carrying out a multi-pass multi-layer laser additive experiment through an earlier-stage single-pass laser additive process experiment for a titanium alloy powder, and carrying out metallographic observation on a cladding layer to obtain the optimal process parameters; carrying out laser additive manufacturing printing for a performance test sample piece of the titanium alloy on a titanium alloy substrate, completing a performance test, evaluating a test result, and determining a repair process; carrying out photographing recording on an area to be repaired, and completing surface cleaning; carrying out accurate clamping on the titanium alloy valve rod, and locking the end part by a center; reserving machining allowance in an additive repair damage area carrying out coaxial powder feeding through laser, setting a scanning path to be spiral forward, enabling the left end and the right end of a starting point position to be alternating and rotate clockwise with time difference,and controlling temperature rise of the workpiece; and adopting fluorescence detection, machining according to the requirement of a drawing to restore a size, and delivering and using. According to the laser additive repair method for the titanium alloy valve rod, the requirement of safe use for the titanium alloy valve rod in a life cycle is guaranteed by optimizing the laser additive process parameters and a scanning path strategy.

The invention belongs to the technical field of aviation precision casting, and particularly relates to a precision casting process of a high-temperature alloy turbine. The precision casting process of the high-temperature alloy turbine comprises the following steps of designing and manufacturing a part mold, preparing a ceramic core, preparation of a shell slurry, preparation of a part shell, dewaxing of a shell, pre-roasting of the shell and casting of the part, wherein the part mold is designed to ensure the integral punching of a wax mold by adopting a bottom injection type design. An inner cavity of the part is filled with the ceramic core, the ceramic core is an aluminum-based ceramic coated with cobalt aluminate on the surface, the surface of the inner cavity of the part can be effectively reduced by coating the surface of the ceramic core with cobalt aluminate, so that the problems of oxidation and shrinkage in the inner cavity of a traditional casting process casting are successfully solved, and meanwhile, the high porosity can ensure that the ceramic core can be removed by a high-pressure water gun after being poured.

The invention discloses aluminum alloy and an LED lamp substrate applying the aluminum alloy. The aluminum alloy comprises the following compositions in percentage by weight: more than or equal to 0.5 percent and less than or equal to 12 percent of Si, more than or equal to 0.1 percent and less than or equal to 1.5 percent of Mn, less than or equal to 1.2 percent of Fe, less than or equal to 4.5 percent of Cu, less than or equal to 0.5 percent of Mg, more than or equal to 0.005 percent and less than or equal to 0.85 percent of RE, less than or equal to 0.5 percent of inevitable impurities, and the balance of Al, wherein the RE is selected from at least one of La, Ce, Nd and Yb. The LED lamp substrate is provided with a copper plate and an aluminum alloy plate, and the copper plate and the aluminum alloy plate are jointed into a whole through high pressure forming. The aluminum alloy has excellent thermal conductivity and high temperature antioxidation performance, and is suitable for manufacturing the LED lamp substrate. The LED lamp composite substrate completely solves the problems of deformation and oxidation caused by uneven thermal expansion coefficients of two materials for the substrate and a lamp shell in the prior art, and contributes to manufacture of high power LED lamps in low cost.

The invention discloses a production method of edible rice bran oil. The production method comprises the following steps of: firstly, heating four-stage standard rice bran oil by a preheater and charging into a separator, evenly distributing the materials under high vacuum degree, due to the boiling point difference of various substances, separating light components of raw material oil in an evaporating way by a pressure reducing technology, heating heavy components, charging into a purifier, quickly evaporating, separating aflatoxin and pesticide residue in an evaporating way, filtering the treated rice bran oil, contacting with protective gas in a stripping tower, and discharging in a separating way, wherein the acid value of the rice bran oil discharged out of the tower bottom achieves the standard of first-stage rice bran oil; and dewaxing in a winterization way to obtain the first-stage rice bran oil. According to the production method, the first-stage rice bran oil product with high oryzanol content can be produced. The whole technical process separates by a pure physical method, so that nutrition components can not be damaged; the production method does not need adding of any annexing agents, so that the safety of the product can be guaranteed; and the production method does not generate any waste gas, sewage or solid waste.

The invention discloses a preparation method for an aluminum-stainless steel clad metal plate and strip. The method comprises: carrying out anaerobic continuous casting and rolling on semisolid aluminum or aluminum alloy and a solid stainless steel plate strip to prepare the aluminum-stainless steel clad metal plate strip. In the preparation method of the invention, the non-oxidation metallurgy composite of the solid stainless steel plate strip and aluminum liquid is realized, the oxidation problem of the aluminum is solved, the composite strength is high, and the bond strength of the stainless plate and the aluminum is larger than or equal to 100Mpa; continuous casting and rolling is carried out on the stainless plate strip and the aluminum liquid to prepare the aluminum-stainless steel clad metal plate strip, the production efficiency is greatly improved by up to dozens of times, and the product quality is stable; the prepared aluminum-stainless steel clad metal plate strip product maintains the intrinsical surface quality of the stainless steel plate strip, and the stainless steel layer has even thickness and can be performed with cold rolling and deep processing; various stainless steel plate and strips with different components and the aluminum liquid can be adopted, the sorts of products are more, and the applicability is wide; and the invention has the advantages of advanced production process, less working procedure, energy conservation, materials saving and remarkable economic effects.

The invention discloses a method for preparing large-size molybdenum plates for sputtering targets of liquid crystal display (LCD) flat-panel displays, which comprises: 1), uniformly brushing an antioxidation coating on the surface of a molybdenum plate blank by pressing and sintering by the conventional process; 2), covering the molybdenum plate blank with the antioxidation coating with a steel capsule; 3), rolling the molybdenum plate blank covered with the steel capsule by one time of heating, and cooling the rolled molybdenum plate blank on a cold bed; 4), rolling the cooled molybdenum plate blank till the thickness (including the steel capsule) of the molybdenum plate blank is between 19 and 24 millimeters; 5), leveling the rolled molybdenum plate blank, removing the steel capsule, cutting the molybdenum plate blank and obtaining semi-finished molybdenum plates; and VI, performing the vacuum heat treatment of the semi-finished molybdenum plates, and obtaining the large-size molybdenum plates for the sputtering targets of the LCD flat-panel display. The large-size molybdenum plates for the sputtering targets of the LCD flat-panel display, which are prepared by the method of the invention, have flat surfaces, the density of the plates is more than or equal to 10.15g/cm<3>, the microscopic structure of the plates is uniform equiaxial structure, and the average grain size of the plates is not more than 200 mu m.

The invention relates to a titanium and titanium alloy low-cost continuous casting technology and equipment. Under argon protecting or inert gas atmosphere, a plasma gun of at least 65 KW is used as a heat source. Through a crystallizer, a plasma gun and a down-pulling mechanism, continuous casting of titanium and titanium alloy circular and flat cast ingots is achieved. The machining cost of titanium alloy is lowered by about at least 15%. The produced titanium and titanium alloy are even in components, segregation is avoided, and metallurgical quality problems are avoided.

The scale and corrosion inhibiting method for industrial boiler includes preparing stable sodium sulfite with sodium sulfite and isoascorbic acid, adding polyepoxy succinic acid into the boiler system, adding stable sodium sulfite and maintaining the amount inside the boiler system in 2-10 mg/L to make these two kinds of green scale inhibitor and deoxidant take synergistic effect, so as to provide environment friendly, high efficiency scale and corrosion inhibiting method for industrial boiler.