414results about How to "No oxidation" patented technology

An oxidation catalyst for treating an exhaust gas from a diesel engine and an exhaust system comprising the oxidation catalyst are described. The oxidation catalyst comprises: a first washcoat region for oxidising carbon monoxide (CO) and hydrocarbons (HCs), wherein the first washcoat region comprises a first platinum group metal (PGM) and a first support material; a second washcoat region for oxidising nitric oxide (NO), wherein the second washcoat region comprises platinum (Pt), manganese (Mn) and a second support material; and a substrate having an inlet end and an outlet end; wherein the second washcoat region is arranged to contact the exhaust gas at the outlet end of the substrate and after contact of the exhaust gas with the first washcoat region.

The invention relates to the technical field of electroplating pretreatment, in particular to a process for carrying out vacuum cleaning, oil removal and wax removal by a modified hydrocarbon cleaner. The process comprises degassing ultrasonic cleaning, vacuum cleaning, vacuum steam flushing, vacuum drying and the like. A plurality of flows are carried out in the vacuum environment with a certain vacuum degree and are matched with a degassing ultrasonic cleaning and vacuum cleaning technology and the modified hydrocarbon cleaner. For the cleaning process, in the whole process, harmful substances of halogen and the like, such as trichloroethylene, methylene chloride, tetrachloroethylene and the like, cannot be used and additional drying equipment is not required. Particularly, the process has excellent cleaning effect on irregular articles with blind holes, joints, gaps, cracks and the like. Meanwhile, the defects of oil removal and wax removal of the conventional process are overcome.

The invention discloses a preparation method of high-performance silicon dioxide grease, which comprises the following components, base oil of 70 to 90 weight percent, silica of 5 to 30 weight percent, modifying agent is in a dose of 5-30 weight percent of the silicon dioxide. The silicon dioxide grease of the invention has a very good storage stability and shear stability, good colloidal stability, water resistant properties of high temperature and low temperature performance. The silicon dioxide grease can be used for electrical insulation, damping system lubrication, vacuum sealed, instruments and cock sealing and lubricating, can also be used for resistant chemical media site lubricating and sealing, and so on. In addition, the silicon dioxide grease can also be used for preparing valves grease, methanol resistance grease, and is applicable in lubrication and interrupter of the metal contact of switch silvering, silver plating, and tinning and other.

The invention discloses a fence preservation method for prolonging shelf life of cold fresh poultry. The fence preservation method for prolonging the shelf life of the cold fresh poultry comprises the following steps of: placing fresh poultry which is obtained by slaughtering, washed completely and cut into a refrigeration storage at the temperature of between 2 and 5 DEG C and precooling the poultry for 1 to 2 hours, so that the surface temperature of the poultry is reduced below 5 DEG C and the internal temperature of the poultry is reduced below 10 DEG C; transferring the precooled poultry to a purification room and performing surface sterilization on the poultry through ozone or ozone solution of an ozone generator; immersing the poultry subjected to ozone sterilization into chitosan glutamate solution to retain freshness; taking out and draining the poultry; placing the poultry after corrosion prevention and freshness preservation into a food plastic packaging box; introducing carbon dioxide (CO2) and nitrogen (N2) into the food plastic packaging box and performing sealing package; and storing the packaged poultry into a cold chain at the temperature of between 2 and 5 DEG C. The fence preservation method for prolonging the shelf life of the cold fresh poultry has good effect and is suitable for retaining freshness of the fresh cut poultry.

The invention relates to the field of nanometer materials, and particularly relates to nano-silver-containing adhesive and a using method of the adhesive in technical wood. The nano-silver-containing adhesive is characterized in that nano-silver is uniformly applied to an environmentally friendly glue solution, and flour is used as an additive of glue. A preparation method of the nano-silver comprises the following steps: adding a sodium dodecyl sulfate solution and a hydrazine hydrate solution to a silver nitrate solution so as to obtain mixed liquid, and adding crown ether and an alkali metal-containing reducing agent to the mixed liquid, wherein the molar ratio of the crown ether to the silver nitrate is (1-2): 1, the molar ratio of the alkali metal-containing reducing agent to the silver nitrate is (0.5-1): 1; and controlling a pH value to 8-9, thus obtaining the nano-silver. The using method of the adhesive comprises the following steps: bonding decorative veneer and a base material through the nano-silver-containing adhesive, then feeding into a vacuum tank, and vacuumizing; then carrying out pressurizing treatment; carrying out microwave treatment; and finally taking out, and carrying out cold pressing and hot pressing. The nano-silver-containing adhesive provided by the invention has good stability, dispersity and adhesiveness.

The invention discloses an airflow energy-saving drying device and an airflow energy-saving drying method and belongs to the field of drying and energy saving. The device comprises a filter (1), an air blower (2), a heater (3), a feeder (4), an airflow dryer (5), a cyclone separator (6), a bag dust remover (7), an induced draft fan (8) and a pre-heater (9), wherein the filter (1) is connected to an inlet of the air blower (2); the air blower (2) is connected to an inlet of the pre-heater (9); an outlet of the pre-heater (9) is connected to an inlet of the heater (3); an outlet of the heater (3) is connected to an inlet of the airflow dryer (5); the airflow dryer (5), the cyclone separator (6), the bag dust remover (7) and the induced draft fan (8) are connected with one another in sequence; an outlet of the induced draft fan (8) is simultaneously connected with the pre-heater (9) and the heater (3). The airflow energy-saving drying device and the airflow energy-saving drying method are capable of recycling the waste heat of the airflow drying tail gas to the maximum extent; the problem of accumulation of moisture in circulating air is solved; the operation load of the device is effectively reduced.

The invention discloses low-emissivity coated glass which can be baked to be bent, relates to coated glass, in particular to the low-emissivity coated glass. The invention provides the low-emissivity coated glass and a sandwich heat-protecting glass formed by the low-emissivity coated glass. The low-emissivity coated glass is sequentially provided with a glass sheet, a first dielectric layer, a low-emissivity layer, a second dielectric layer and a protection layer, wherein, in a preferable embodiment, the coated glass is sequentially provided with glass substrate, SiOxNy, NbOx, NiCrOx, ZnSnOx, Ag, NiCrOx, NbOx and SiOxNy membranous layers. A polyvinyl butyral (PVB) layer and a glass sheet are sequentially overlapped outside the protection layer of the low-emissivity coated glass to form the sandwich heat-protecting glass. The visible light transmittance of the sandwich heat-protecting glass is at least 76%, and the solar energy transmittance is equal to or less than 48%; or the visible light transmittance is equal to or more than 70%, and the solar energy transmittance is equal to or less than 43%. The sandwich heat-protecting glass is particularly suitable for being used as the front windshield glass of an automobile.

The invention discloses high-temperature Zr-based brazing filler metal for brazing of W-Cu alloy and stainless steel, as well as a preparation method and a welding method. The high-temperature Zr-based brazing filler metal comprises the following elements by weight: 10 to 12 percent of V, 3.0 to 9.0 percent of Nb, 3.0 to 4.0 percent of Si, 8.0 to 16 percent of Cu, 9.0 to 12 percent of Ni, 11 to 14 percent of Cr, 3.0 to 5.0 percent of Sn, and the balance of Zr. The brazing temperature of the brazing filler metal is 1010 to 1090 DEG C and moderate, so that the brazing filler metal is uniformly melted; tinsel made of the brazing filler metal can accelerate atomic diffusion and interface reaction in a high-temperature connection process, so that the wetting and spreading capabilities of the brazing filler metal are improved, the residual stress in a joint is reduced, and the mechanical property of the joint is improved. Through the adoption of the preparation method of the brazing filler metal, the preparation of the brazing filler metal can be reproduced repeatedly, so as to facilitate popularization and application; through the adoption of the brazing technology provided by the invention, sample pieces are connected through vacuum brazing, wherein the sample pieces are in a vacuum atmosphere while being heated, so that problems such as oxidation and pollution are solved, the surface wetting and spreading capabilities are relatively high, convenience is brought for filling of a brazing seam, the strength of the joint is improved, and the obtained welded joint can be stable and reliable.

The invention relates to a preparation method of a magnesium alloy corrosion resistant coating. The method is characterized in that spherical aluminum powder or spherical aluminum powder and SiC or Al2O3 powder are adopted, compressed air is used as an air source, and then a coating is prepared by a low-temperature pneumatic spraying method. The adopted powder comprises 100% of aluminum powder or 70-98wt% of aluminum powder and 30-2wt% of hard particles. After-treatment is performed by ceramic shot blasting or a 518 sealant produced by the Beijing Institute of Aeronautical Materials. Compared with the prior art, an aluminum coating prepared by the low-temperature pneumatic spraying method is dense with low porosity and high hardness, has good bonding strength with a base body, and has good corrosion resistance and wear resistance, thereby being a good protection coating for corrosion resistance of magnesium alloy.

The invention provides a preparation method of a molybdenum powder with ultra-large granularity, which relates to the preparation method used for an alloy powder with special physical performance and high melting point. The invention is characterized in that the preparation process comprises the following steps that: (1) a molybdenum powder is selected, with the Fisher particle size of 2.5-3.5 Mum, the loose density of 0.9 g/cm<3>-1.1 g/cm<3> and the oxygen content less than 0.08wt%; (2) the selected molybdenum powder is pressed into a blank under the pressure of 15MPa-30MPa; (3) the pressed blank is sintered for 1-5 hours under the temperature of 800-1200 DEG C; (4) the sintered blank is broken, ball milled and screened so as to prepare the molybdenum powder which consists of the grain groups with the average granularity of 100-200 Mum. By adopting the method of the invention, the molybdenum powder which consists of the grain groups with the average granularity of 100-200 Mum can be prepared and more than 80% of the yield can be realized.

The invention discloses a high-strength steel thin-wall piece vacuum thermal treatment process, which comprises vacuum quenching and vacuum tempering, wherein the vacuum quenching comprises the following specific steps of: heating to 650 DEG C at the vacuum degree between 1.33*10<-4> Pa and 1.33*10<-2> Pa; preserving heat for 25 minutes; heating to 870-880 DEG C; preserving heat for 30-35 minutes; charging 7-9 bar of high-purity nitrogen gas into a furnace for performing air pressure quenching; and cooling to 50-60 DEG C; and vacuum tempering comprises the following specific steps of: performing counter-flow heating to a tempering temperature under the protection of 1-1.5 bar of high-purity nitrogen gas; preserving heat for 1.5-2 hours; charging 3-4 bar of high-purity nitrogen gas into the furnace for performing air pressure cooling; and cooling to a low temperature for discharging. A high-strength steel thin-wall piece vacuum thermal treatment surface has the advantages of freeness from oxidation and decarburization, high size precision, uniform hardness, high strength and low cost.

The invention relates to an aluminum-based amorphous/high-entropy alloy composite and a preparation method thereof, belonging to the field of metal composites. The composite is relatively low in density and high in compressive strength and has certain deformability. The preparation method comprises the steps of placing metal powder of Al, Cu and Ti or Al, Fe and Ti or Al, Ni and Ti into a ball milling tank, injecting methylbenzene from a glove box with an Ar atmosphere to the ball milling tank, taking all the components out of the glove box after sealing the tank, and carrying out ball milling to obtain aluminum-based amorphous powder; preparing an original material from Al, Co, Cr, Fe and Ni metal blocks, and carrying out alloy smelting in vacuum by taking Ar as a protective gas to obtain a mother alloy ingot of AlCoCrFeNi high-entropy alloy; atomizing the obtained mother alloy ingot, and screening to obtain spherical high-entropy alloy powder with the particle size of 20-100mu m; and after carrying out ball milling and mixing on the obtained aluminum-based amorphous powder and the high-entropy alloy powder, placing the mixture into a hard alloy die to sinter to obtain the aluminum-based amorphous/high-entropy alloy composite.

The invention discloses a preparation method for a wear-resistant and corrosion-resistant composite coating layer. The preparation method specifically comprises the following steps: S1. carrying out pretreatment on a cladding matrix; S2. carrying out drying treatment on a cladding material; S3. melting the cladding material and the surface layer of the cladding matrix simultaneously through a laser device and in combination with a coaxial powder feeding method to form an alloy coating layer, that is, the high-hardness corrosion-resistant layer, wherein the cladding matrix in the step S1 is made from Q960 steel; and the cladding material in the step S2 is made from the mixture of tungsten carbide powder and Stellite 6 alloy powder. According to the preparation method disclosed by the invention, the composite coating layer is creatively prepared on the surface of the Q960 steel through a laser cladding technology; the tungsten carbide powder and the Stellite 6 alloy powder are mixed as the cladding material in a specific ratio; and the process parameters of the laser cladding technology are scientifically and reasonably designed, so that the problems of low hardness and short servicelife under the working condition of abrasive wear, of a laser cladding coating layer made from Stellite 6 cobalt alloy, are effectively solved.

The invention relates to a thermoplastic polymer melt spun fiber with anti-mite and antibacterial functions and a preparation method thereof. The preparation method comprises the following steps: preparing a silver-loaded soda borosilicate ceramic powder which serves as an anti-mite and antibacterial component through a sol-gel method, performing surface modification on superfine ceramic powder through a coupling agent, granulating to prepare a high-concentration anti-mite and antibacterial master batch which takes a thermoplastic polymer as a matrix in a double-screw extruder, and finally, blending the anti-mite and antibacterial master batch with the thermoplastic polymer according to a certain ratio, and performing melt spinning to obtain the anti-mite and antibacterial fiber. The anti-mite and antibacterial fiber prepared by the method has obvious effects, is high in durability, high in washing resistance and high in safety.

The invention discloses an automatic traceless fusion welding technology of a thin-wall stainless steel clean pipeline. The technology comprises the following steps of: step 1, treating a welding port: milling pipe end welding surfaces of two welded pipeline segments into planes; step 2: assembling welded junctions; step 3: carrying out point welding; step 4: carrying out fusion welding: carrying out fusion welding on the two pipeline segments by adopting an argon tungsten-arc welding machine, wherein the fusion welding process comprises the following steps of: introducing a protective gas before welding, welding the two welded pipeline segments by adopting the argon tungsten-arc welding machine, and introducing argon continuously during the welding process and introducing a protective gas continuously after welding; and step 5: sealing and protecting after welding. The automatic traceless fusion welding technology of the thin-wall stainless steel clean pipeline provided by the invention is reasonable in design, is simple and convenient to operate, is convenient to achieve, has a good pipeline cleanness control effect, is high in welding quality, and can effectively solve the problems of high labor intensity, low efficiency, high production cost, severe welding junction oxidation, poor formation inside and outside a welding line, difficulty in controlling cleanness in pipelines, poor cleanness control effect and the like in an existing welding method.

A vacuum soldering technology for the plasma cutting electrode includes assembling the non-oxygen copper sleeve, silver body and wire feeding coaxial core together, arranging solder, putting the assembly in vacuum furnace, vacuumizing to 1-5X10 to the power -1 - -2 Pa, heating and holding the temp twice at 820-880 deg.C, filling N2, and cooling. The resultant electrode features high quality and long service life (500 m for cutting steel plate).

The invention discloses a vacuumizing cover opening device with an air leakage function and a high speed blender. The vacuumizing cover opening device comprises a cup cover, a cup cover plug valve, avacuum nozzle, a vacuum nozzle sealing ring, an inner cover, a rubber cushion, a pressing plate, an air leakage sealing plug, a vacuum pump, a vacuum pipe, an air leakage switch, and others; the top part of the cup cover is provided with a cover hole, and the cup cover plug valve is arranged in the cover hole; the outer wall of the cup cover plug valve is connected with the cover hole in a sealingmanner; the inside of the cup cover plug valve is a unidirectional air valve opening; the upper part of the vacuum nozzle is a shell body structure with an inner cavity, an air leaking hole for leaking air and an air pumping hole for pumping air are arranged in the inner cavity of the vacuum nozzle; the upper part of the vacuum nozzle is provided with an annular buckle position. Compared with theprior art, the vacuumizing cover opening device with the air leakage function can be matched with a cup body of the high speed blender, and can vaccumize the cup body of the high speed blender, thusthe defects that the high speed blender is easy to blister and oxidize in mixing process, and cannot store food for a long time after blending, and easy to 'layer' and flare' are solved.

The application discloses a method for preparing a through-type composite strip embedded with silver copper. The method comprises the steps of: extruding silver and copper ingots into profiled strips according to a design shape, respectively cleaning the surfaces of the profiled silver strip and the purchased profiled copper strip, removing a greasy dirt, an impurity and oxide on the surface; mutually embedding the silver strip and the copper strip into a whole; reinforcing and welding two heads to prepare a pre-composite material; continuously rolling and hot rolling to form a silver copper composite material from the pre-composite material under a complete-atmosphere protection state; dragging and receiving materials by a receiving machine, and then annealing in a diffusion manner, rolling and cutting to obtain the product. The method disclosed by the application is high in bonding strength, low in demand on manufacturing device, easy to process, long in length of strip, and convenient to automatically process, and manufacturing on a large scale can be carried out, thus, the cost is greatly reduced.

The invention relates to a lithium ion battery electrode cyclic attenuation mechanism evaluating method. With the method adopted, the technical problem that the various failure mechanisms of an integrated battery system are difficult to completely separate can be solved. According to the lithium ion battery electrode cyclic attenuation mechanism evaluating method, anode polar sheets, cathode polarsheets and electrolyte are assembled, so that a plurality of sets of single-layer soft-package integrated batteries can be formed; after formation is performed, empty electricity and full electricitytesting is performed; the anode polar sheets and the cathode polar sheets are taken out, and residual electrolyte is removed; and the anode polar sheets and the cathode polar sheets are assembled into soft-package laminated symmetrical batteries, and the attenuation mechanisms of the symmetrical batteries are cyclically tested and analyzed. A symmetrical battery system is adopted, the failure mechanisms of the anodes or and cathodes are separately studied, the generation of the side reactions of the anodes or cathodes is avoided, a test voltage range is narrow, and electrolyte oxidation is avoided. Compared with a half-battery system, the symmetrical battery system is limited in lithium transmission, and has no extra lithium (lithium sheet) participating in side reactions; compared with abutton-type symmetrical battery system, the soft-package symmetrical battery system ensures the sealing of a whole device and enables long-term cyclic testing.

The invention relates to the field of nano materials, in particular to a nano-silver aqueous solution and an application method for applying the nano-silver aqueous solution to technical wood. According to the aqueous solution, deionized water is used as a solvent, nano-silver is used as a solute and dissolves in the deionized water, acrylic resin is used as a complexing agent and a stabilizing agent and dissolves in the deionized water, meanwhile a dispersing agent and a first reducing agent are added to the deionized water, and then the solution is formed, wherein the dispersing agent is triethanolamine, the first reducing agent is a hydrous ammonia aqueous solution, the concentration of nano-silver ranges from 50 ppm to 150 ppm, and the mass content of acrylic resin in the solution ranges from 1% to 10%. The application method includes the steps that the technical wood is fed to a vacuum tank filled with the nano-silver aqueous solution, and the vacuum tank is pumped until the vacuum degree ranges from -0.05 MPa to -0.01 MPa for 15 min to 20 min; pressure application is conducted, and pressure is applied to 0.2 MPa to 0.5 MPa for 18 min to 28 min; eventually, microwave processing is conducted for 1 min to 3 min, the microwave frequency ranges from 300 MHz to 950 MHz, and then the technical wood is taken out for drying. The nano-silver aqueous solution is good in stability and dispersibility, nano-silver can be more effectively permeated into the technical wood, and mold is fully defended.

The invention discloses a method for sintering neodymium iron boron magnets. The method for sintering the neodymium iron boron magnets is characterized by comprising the following steps of (1) preparation, wherein neodymium iron boron green bodies are buried in high-temperature resisting powder to enable the neodymium iron boron green bodies to be isolated from air, and the sintering temperature of the high-temperature resisting powder is higher than that of the neodymium iron boron magnets; (2) furnace feeding, wherein the neodymium iron boron green bodies and the high-temperature resisting powder are fed into a sintering space in the furnace together; (3) sintering, wherein the neodymium iron boron green bodies are sintered to form the neodymium iron boron magnets. The method can reduce the oxidation of the neodymium iron boron green bodies before the neodymium iron boron green bodies are fed into the furnace, therefore, sintering deformation is reduced, reserved allowance for the machining of the neodymium iron boron green bodies is reduced, and subsequent machining is made to be convenient.