14results about How to "Good deoxidation effect" patented technology

The invention relates to the technical field of welding materials, in particular to a high-efficiency deposited nickel-based welding wire capable of preventing welding cracks based on phase regulation and application of the high-efficiency deposited nickel-based welding wire, and the nickel-based welding wire comprises the following chemical components in percentage by weight: less than or equal to 0.03% of C, 0.10-0.20% of Si, 2.9-3.2% of Mn, and 1t of P; 0.005%, S: lt; 0.003% of Cu, 19.7-20.5% of Cr, less than or equal to 0.04% of Co, and 1t of Cu; the Ni-based alloy comprises the following components in percentage by weight: 0.10% of Ni, 0.3-0.6% of Ti, 0.4-2.0% of Fe, 2.1-2.9% of Nb, less than or equal to 0.3% of Mo, less than or equal to 0.01% of N, less than or equal to 0.005% of O, less than or equal to 0.50% of other impurity elements and the balance of Ni. The specific value of Ti to Nb is controlled to be 0.10-0.22, the specific value of C to Nb + Ti is controlled to be 0.012 or below, appropriate morphology and distribution of (Nb, Ti) C type intergranular precipitates are obtained, precipitation of grain boundary M23C6 is reduced, and the creep resistance and high-temperature deplasticity crack resistance of the material are effectively optimized.

The utility model provides a purification device for gas deoxidation, which belongs to the technical field of chemical equipment and comprises a deoxidizer, a heat exchanger, a gas distributor and a powder collecting tank. The deaerator comprises a deaerator cylinder, and a raw material gas inlet pipe and a raw material gas outlet pipe are arranged at the bottom of the deaerator cylinder; the heat exchanger comprises a built-in heat exchanger and a central heat exchange tube connected to the built-in heat exchanger; the built-in heat exchanger is communicated with a feed gas inlet pipe; the central heat exchange tube is communicated with the built-in heat exchanger; the gas distributor comprises a sieve plate distributor and a cone distributor, and the sieve plate distributor is positioned above the cone distributor; the powder collecting tank is connected to the central heat exchange tube and is connected to the small end of the cone distributor; and a powder discharging pipe is arranged at the bottom of the powder collecting tank. According to the device, raw material gas can be uniformly distributed, the retention time of the raw material gas and the contact time of the raw material gas and a deoxidizing agent are prolonged, bias flow of the raw material gas is avoided, the deoxidizing effect of the deoxidizing agent is ensured, and the service life of the deoxidizing agent is prolonged.

The invention relates to the technical field of multi-component alloy preparation, and discloses a rare earth oxide-containing silicon-barium alloy and a preparation method thereof.The preparation method comprises the following steps: mixing rare earth balls, silica, baryta, a layered composite material, modified carbon fibers, semi-coke and steel cuttings to obtain a mixture; and the mixture is placed in a submerged arc furnace to be circularly smelted, mixed rare earth silicon barium alloy liquid is formed, the mixed rare earth silicon barium alloy liquid is subjected to refining and slagging-off, casting forming is conducted, and the silicon barium alloy containing the rare earth oxide is obtained. The formed layered composite material has relatively high interlayer capacity, and the silicon element and the rare earth element in the mixture can be adsorbed to the interlayer of the layered composite material, so that the formation of a uniformly distributed silicon-barium-rare earth alloy phase is facilitated; the modified carbon fibers are small in size and can be filled into pores of the silicon-barium alloy, the compactness of the alloy is improved, and then the compactness of the silicon-barium-rare earth alloy phase is enhanced.

The invention provides a grease hydrodeoxygenation catalyst and a preparation method and application thereof, the preparation method comprises the following steps: mixing an aluminum-containing inorganic porous material, an acidic solution, an extrusion aid, a magnesium salt and a nickel salt, then carrying out extrusion molding to obtain a carrier precursor, and drying and roasting the carrier precursor to obtain a hydrodeoxygenation composite carrier; by taking the total weight of the carrier as 100%, the content of the magnesium element is 0.5-10%, and the content of the nickel element is 0.3-2%; dipping the hydrodeoxygenation composite carrier with a dipping solution containing active metal, and then drying and roasting to obtain the grease hydrodeoxygenation catalyst. When the hydrodeoxygenation composite carrier is prepared, magnesium salt and nickel salt are combined, and the hydrodeoxygenation composite carrier with a nickel-doped magnesium aluminate spinel structure can be obtained. The hydrodeoxygenation composite carrier has good hydrothermal stability and mechanical strength. The grease hydrodeoxygenation catalyst prepared by loading an active metal component on the hydrodeoxygenation composite carrier is stable in deoxygenation activity and excellent in deoxygenation effect.

The invention relates to the technical field of brazing materials, in particular to a brazing sheet for brazing flux-free brazing and a preparation method and application of the brazing sheet. The brazing sheet comprises a composite board of a sandwich foil structure and film breaking layers located on the two sides of the composite board, the film breaking layers contain Ge, the composite board comprises a core material layer and brazing filler metal layers located on the two sides of the core material layer, and the brazing filler metal layers contain, by mass, not lower than 0.9% of La and not lower than 0.9% of Ce. According to the brazing sheet, brazing flux does not need to be coated during brazing, brazing flux-free brazing of the radiator can be achieved, and the strength of a brazed connector is high. According to the method, the brazing plate without the broken film layer is rolled firstly, then the upper surface and the lower surface of the brazing plate are coated with the layer of broken film metal powder in a dip-coating mode, the brazing plate with the broken film metal layer is formed through the in-situ melting reaction, the problem that the brazing plate with the Ge broken film layer is difficult to prepare through a traditional rolling method is solved, the broken film layer and the composite plate are metallurgically bonded, the bonding strength is high, and the service life is long. The falling cannot easily occur.

The utility model provides a multi-stage combined deoxidation tank. The multi-stage combined deoxidation tank comprises an upper tank body, a middle tank body and a lower tank body which are connected through flanges, a water inlet is formed in the side wall of the upper tank body; an inner cavity of the first-stage deoxidization chamber is a first-stage deoxidization chamber and is sequentially provided with a gas-liquid separation net, an atomizer, a first-stage deoxidization filler layer and a supporting grating plate I from top to bottom; a diversion unit and a porous liquid homogenizing plate are arranged in an inner cavity of the middle tank body; a sewage outlet and a liquid outlet are formed in the bottom of the lower tank body, and a medicament inlet is formed in the side wall; an inner cavity of the secondary deoxidizing chamber is a secondary deoxidizing chamber, and a secondary deoxidizing filler layer, a supporting grating plate II, a temperature control coil pipe and a supporting grating plate III are sequentially arranged in the secondary deoxidizing chamber from top to bottom. According to the multi-stage combined deoxidation tank, a multi-stage combined mode of vacuum deoxidation and chemical deoxidation is adopted, the deoxidation effect is good, the deoxidation efficiency is high, and the medicament consumption is low; the vertical integrated design of the upper, middle and lower tank bodies is adopted, the structure is compact, and the occupied area is reduced.

The invention provides a hydrodeoxygenation composite carrier and a preparation method and application thereof.The preparation method comprises the steps that an aluminum-containing inorganic porous material, an acid solution, an extrusion aid, magnesium salt and nickel salt are mixed and then subjected to extrusion molding to obtain a carrier precursor, and the carrier precursor is dried and roasted to obtain the hydrodeoxygenation composite carrier; the total weight of the hydrodeoxygenation composite carrier is 100%, and the content of the magnesium element is 0.3-8%, and the content of the nickel element is 0.3-1%. The hydrodeoxygenation composite carrier provided by the invention has hydrothermal resistance and higher mechanical strength, and can improve the hydrothermal stability of a grease hydrodeoxygenation catalyst taking the hydrodeoxygenation composite carrier as a carrier in the hydrodeoxygenation process, thereby improving the deoxygenation effect of the grease hydrodeoxygenation catalyst.

The invention relates to a production method for improving fatigue resistance and toughness of a steel wire rod for a welding wire, which comprises the following steps of: mixing molten iron and scrap steel into a converter, smelting to obtain molten steel, sequentially adding silicon iron, silicon manganese and lime into the molten steel in the tapping process, and determining whether sulfur-containing slag is added into the molten steel or not according to the content of S in the molten steel; adding low-titanium and low-aluminum silicon iron and manganese metal to adjust the components of molten steel according to the target components of the steel grade, and then carrying out LF (Ladle Furnace) refining; and then carrying out protective casting, carrying out segmented heating on a steel billet, rolling the steel billet into a wire rod, carrying out water cooling, cooling and spinning, placing the wire rod on a Stelmor slow cooling line for slow cooling, and sending the wire rod into a heat preservation vestibule for slow cooling. The steel wire rod for the welding wire has good quality and stable mechanical properties from inside to outside through component control and process adjustment and optimization aiming at factors such as carbon segregation and inclusions in the production process, so that the fatigue resistance and toughness of the steel wire rod for the welding wire are improved.

The utility model discloses a crystallization heat treatment furnace deoxidation mechanism, which relates to the technical field of heat treatment furnaces, and comprises a furnace body, a furnace cover is arranged at the top of the furnace body, a deoxidation assembly is arranged at the bottom of the furnace cover, the deoxidation assembly comprises a deoxidation pipe, spherical deoxidizer particles are contained in the deoxidation pipe, and a mesh enclosure is fixedly connected to an opening at the bottom of the deoxidation pipe. A feeding pipe is fixedly connected to a top opening of the deoxidizing pipe and penetrates through the furnace cover, and a sealing cover is mounted at the top of the feeding pipe. The deoxidizing furnace has the beneficial effects that a deoxidizing agent is added into the deoxidizing pipe, nitrogen is added into the furnace body through the deoxidizing pipe, the nitrogen is deoxidized when passing through the deoxidizing pipe, and by arranging the circulating assembly, the nitrogen in the furnace body can pass through the deoxidizing pipe again, so that circulating deoxidizing is conducted, and the deoxidizing effect is guaranteed; and the deoxidizing agent in the deoxidizing pipe is continuously pounded by the material pounding assembly through the auxiliary assembly, so that the nitrogen and the deoxidizing agent are more fully contacted, and the deoxidizing effect is further improved.

The invention provides a low-resistance temperature coefficient precision resistance alloy and a preparation method thereof. The alloy comprises the following components: less than or equal to 0.04% of C, 1.30%-1.50% of Si, 0.30%-0.55% of Mn, less than or equal to 0.010% of S, less than or equal to 0.010% of P, 19.70%-20.50% of Cr, 3.40%-3.70% of Al, 0.60%-1.0% of Fe and the balance of Ni and inevitable impurities. The alloy has a low resistance temperature coefficient and is widely applied to the fields of aviation, aerospace and high-end instruments and meters. The manufacturing method comprises the steps that smelting is conducted in a vacuum induction furnace, a steel ingot is obtained through casting and vacuum consumable remelting, and then heating, forging and heat treatment are conducted on the steel ingot. In the smelting process, the alloy components are ensured to be accurate by controlling the pressure in the furnace, the oxygen and nitrogen content and the smelting time. And during forging, the temperature is slowly increased to 1050-1060 DEG C, heat preservation is conducted for 2-3 hours, and finally forging is conducted to the needed form. And finally, carrying out heat treatment to improve the mechanical property and the resistance temperature coefficient stability of the material. The manufacturing method can effectively improve the alloy performance, is suitable for production of precision resistor elements, and has a wide market prospect.

The invention relates to an ultrathin-wall alloy pipe and a preparation method and application thereof.According to the ultrathin-wall alloy pipe and the preparation method and application thereof, B, Mg and P are added into a common copper-based alloy, the plastic deformation capacity of the copper-based alloy can be improved through compounding of the B, Mg and P, and in order to avoid the situation that a copper pipe is prone to being snapped after being subjected to duplex drawing and disc drawing treatment, after a pipe blank is obtained, the pipe blank is subjected to heat treatment, according to the method, the on-line annealing step of specific current is carried out, and the outer die with a smaller angle and a shorter fixed diameter length and the floating core head with a shorter fixed diameter length are selected in the drawing treatment after annealing, so that the tensile resistance is reduced while the dimensional precision is ensured. According to the preparation method, the copper pipe with the wall thickness of 0.05-0.10 mm can be produced, the product percent of pass is high, and the preparation method has actual machining value.

The invention relates to the technical field of mechanical casting, in particular to a machining process of a high-durability iron base plate for a high-speed rail fastener. Comprising the following steps that S1, a carburant is added into a cast iron raw material for smelting treatment, then smelting treatment, refining and impurity removal, cooling and discharging are conducted, and a cast iron stock solution is obtained; s2: (1) adding a spheroidizing agent into the cast iron stock solution for spheroidizing to obtain a nodular cast iron solution A; (2) adding an antioxidant inoculant into the nodular cast iron liquid A, and sequentially carrying out primary inoculation, secondary inoculation and third inoculation to obtain nodular cast iron liquid B; s3, the nodular cast iron liquid B is subjected to casting molding, heat treatment and discharging, and an iron base plate A is obtained; s4, the iron base plate A is immersed in the composite electroplating solution, double-pulse electroplating treatment is conducted, cleaning, nitrogen blow-drying and curing are conducted, and the iron base plate is obtained; therefore, the high-durability iron base plate for the high-speed rail fastener is obtained.

The invention discloses molybdenum-chromium-free low-alloy manganese silicon steel and a heat treatment method thereof.The heat treatment method comprises the steps that waste steel is molten and then heated to 1605-1628 DEG C, then preheated automobile steel is added, after the automobile steel is molten, preheated silicon iron and electric furnace ferromanganese are added, and after the silicon iron and the electric furnace ferromanganese are molten, molten steel is obtained; the multi-element alloy wire is fed into the heated molten steel, and a steel billet is cast after slagging-off, standing and cooling; hot-rolling the billet into a steel plate; the steel plate is subjected to austenitizing heat treatment, water-cooling quenching and critical quenching treatment. The alloy material does not contain expensive alloy elements such as molybdenum, nickel, vanadium and niobium, and does not contain chromium element which is poor in resources in China, so that the production cost is low. The molybdenum-chromium-free low-alloy manganese-silicon steel has excellent comprehensive mechanical properties, the tensile strength is larger than 750 MPa, the yield strength is smaller than 505 MPa, the yield ratio is smaller than 0.8, the ductility is larger than 25%, and the molybdenum-chromium-free low-alloy manganese-silicon steel is an important substitute material of a new generation of electric power connection fittings.

This invention belongs to the field of catalyst technology, specifically relating to a sulfur recovery catalyst and its preparation method. The sulfur recovery catalyst uses Al2O3 as a support and is loaded with TiO2, Fe2O3, and Al. x O y Wherein A is selected from at least one of alkali metals or alkaline earth metals; by mass fraction, TiO2 content is 1wt%~15wt%, Fe2O3 content is 0.5wt%~10wt%, and A... x O y The content is 0.1wt%~5wt%, with the remainder being Al2O3. This invention uses shaped alumina as a support to ensure the mechanical strength and appropriate catalytic activity of the catalyst. Secondly, Ti-Fe-A is formulated into a stable composite complex and loaded onto the support through co-impregnation. Calcination then allows the components to be cross-distributed at the atomic level, ensuring interconnection between reactions. This improves the overall activity of the catalyst and extends its service life.