18 results about "Internal oxidation" patented technology

The application discloses a high-surface-quality 980MPa-grade hot-dip galvanizing DH steel and a preparation method thereof. The main chemical component mass content of the hot-dip galvanizing DH steel is as follows: C: 0.17-0.21%, Si: 0.4-0.7%, Mn: 1.8-2.2%, Nb: 0.01-0.02%, Ti: 0.01-0.02%, Cr: 0.4-0.5%, and Als: 0.14-0.9%. The method adopts low-carbon design and high-dew-point annealing process to produce the hot-dip galvanizing steel plate which meets the low-carbon environmental protection requirement and has high surface quality, so as to meet the urgent needs of the market. The high-dew-point annealing process is a new type of annealing technology, the oxygen partial pressure is increased by increasing the dew point, the Si and Mn element internal oxidation is realized, and thus the plating leakage defect is effectively improved, and the surface smoothness and flatness of the steel plate are improved.

This invention relates to a clad steel sheet and a method for manufacturing the same. The clad steel sheet comprises: a base steel sheet, which, by weight percent, contains: C: 0.10-0.25%, Mn: 1.5-5.0%, Si: 0.5-2.5%, Cr: less than 1.5%, Al: 0.005-0.100%, P: less than 0.10%, S: less than 0.020%, B: less than 0.0050%, with the balance being Fe and other unavoidable impurities; and a coating formed on at least one side of the base steel sheet, wherein, with reference to the direction from the interface between the base steel sheet and the coating toward the thickness center, the depth of the internal oxide layer composed of one or more oxides of Mn, Si, Cr and B is 3-15 μm. More specifically, the invention relates to a clad steel sheet with excellent surface quality and weld LME resistance, and a method for manufacturing the same.

The present application belongs to the field of electrical materials and powder metallurgy, and particularly relates to a preparation method of a high-voltage electric contact with gradient tungsten-copper alloy and dispersion-strengthened copper composite. The W90Cu / W70Cu / W50Cu gradient layer is prepared by adopting gradient porosity pre-preparation and integrated pressing infiltration technology; the ODS-Cu matrix is prepared by adopting accurate internal oxidation-reduction technology; the vacuum hot pressing-brazing composite connection technology is adopted, combined with pressure keeping in the cooling stage, and the high-temperature plastic rheology of the copper matrix is used to actively inhibit the residual thermal stress, so that the W-Cu / ODS-Cu interface shear strength is greater than or equal to 300 MPa. The contradiction between the ablation resistance, electrical conductivity, thermal stability and interface reliability of the contact material is solved, and the service performance and structural reliability of the high-voltage electric appliance are significantly improved.

This invention belongs to the field of metallurgical technology, and particularly relates to a low-cost, high-surface-quality galvanized hot-formed steel sheet production method. It includes the following steps: S1, using hot-rolled steel strip as raw material, controlling the coiling temperature of the hot-rolled steel strip to ≤550℃ through segmented laminar flow cooling; S2, pickling the hot-rolled steel strip using a composite pickling solution; S3, continuously galvanizing the pickled hot-rolled steel strip, wherein the heating temperature before galvanizing is ≤600℃. This invention eliminates the cold rolling and high-temperature annealing processes, fundamentally avoiding the internal oxidation defects of high-alloy hot-formed steel. The resulting steel sheet has a smooth surface without pitting or incomplete coating, and the interface between the coating and the substrate is clear and uniform. Simultaneously, the composite pickling solution improves pickling efficiency and reduces HCl volatilization. This invention has advantages such as low cost, high surface quality, and strong alloy adaptability.

The application belongs to the technical field of metal matrix composite material preparation, and particularly relates to a preparation method of graphene reinforced aluminum oxide dispersed copper composite material. The method comprises the following steps: taking copper aluminum and cuprous oxide as raw materials, ball-milling and mixing to obtain a mixture, carrying out internal oxidation treatment on the mixture under a vacuum atmosphere, and crushing to obtain aluminum oxide reinforced dispersed copper; mixing the aluminum oxide reinforced dispersed copper and a nano-oxidized graphene dispersion solution, carrying out stirring and ultrasonic treatment, and freeze-drying to obtain aluminum oxide dispersed copper-nano-oxidized graphene powder; and carrying out forming, hydrogen reduction sintering and hot extrusion deformation on the aluminum oxide dispersed copper-nano-oxidized graphene powder to obtain the graphene reinforced aluminum oxide dispersed copper composite material. The application can effectively introduce graphene into the aluminum oxide dispersed copper uniformly, can increase the electrical conductivity of the material while improving the strength, has high controllability, low production cost, simple equipment, a more simplified process flow, is environment-friendly in the process, and is suitable for industrial production.

The application discloses a silver tin oxide production process by internal oxidation, which comprises the following steps: vacuum continuous casting of raw materials to obtain silver alloy wire rods; wire drawing, annealing and shearing of the silver alloy wire rods to obtain silver alloy wire particles; internal oxidation, pickling and compression molding of the silver alloy wire particles to obtain silver alloy ingots; and extrusion sintering, annealing and wire drawing of the silver alloy ingots to obtain silver tin oxide finished products. The application has the advantages of reducing processing procedures and improving the electrical properties of silver tin oxide.

This invention discloses a high-strength, high-plasticity Cu-Al2O3 / Cu composite rod, its preparation method, and its application, belonging to the field of materials technology. The rod has a mixed-crystal structure, wherein the fine Al2O3-dispersed Cu grains have a particle size ≤1.5μm, and the coarse pure Cu grains have a particle size ≥2μm; the content of fine grains in the rod is 40-90wt%, with the remainder being coarse grains. The aforementioned fine Al2O3-dispersed Cu grains provide the rod with high strength, while the coarse pure Cu grains provide high plasticity. Through this mixed-crystal ratio, the inverted relationship of "high strength-high plasticity" in the Cu-Al2O3 / Cu composite material can be effectively improved, enhancing the overall performance of the rod. The preparation of the rod includes: mixing the raw materials to form an ingot, followed by internal oxidation treatment, reduction treatment, and hot extrusion. This preparation process is simple to operate, has low production cost, and is highly feasible.

The present disclosure relates to a nanoparticle dispersion strengthened copper alloy and a preparation method and use thereof. The method includes the steps of: S1) preparing Cu—Al2O3 dispersed copper powder from Cu—Al alloy powder by internal oxidation and reduction; and S2) mixing the Cu—Al2O3 dispersed copper powder prepared in S1 with Cr powder to obtain a composite powder, and subjecting the composite powder to press forming, hot press sintering, sheath moulding, and then aging treatment, where the hot press sintering is conducted at a temperature of 900° C. to 1070° C. and a pressure of 40 MPa to 80 MPa for 2 hours to 8 hours.

This invention provides a self-healing, antioxidant carbon fiber thermal insulation rigid felt and its preparation method. The method involves dispersing repair core material powder in a ceramic precursor solution, stirring until homogeneous, spray-drying, and then curing to obtain high-temperature resistant microcapsules with a ceramic shell encapsulating the repair core material. The high-temperature resistant microcapsules are then dispersed in an adhesive solution to obtain a microcapsule composite impregnation solution. Carbon fiber needle-punched soft felt is immersed in the microcapsule composite impregnation solution, impregnated, and then hot-pressed. The resulting carbon fiber cured felt is then carbonized and graphitized, cooled, and the self-healing, antioxidant carbon fiber thermal insulation rigid felt is obtained. This invention introduces high-temperature resistant microcapsules into the rigid felt matrix. When the rigid felt comes into contact with oxygen at high temperatures, internal oxidation causes cracks, leading to the rupture of the microcapsules. The internal core material flows out and reacts with oxygen to form a solid, filling the cracks, delaying the oxidation failure of the rigid felt, and significantly improving its antioxidant properties and service life.

The application provides a non-oriented electrical steel for a new energy automobile driving motor and a manufacturing method thereof, and the composition is as follows: C: 0.001-0.005%, Si: 3.2-3.5%, Mn: 0.35-0.65%, Al: 0.50-0.80%, P: <=0.02%, S: <=0.005%, 0.010%<=Ce+Sn<=0.020%, and the balance is iron and inevitable impurities. Compared with the prior art, the application can inhibit the generation of an internal oxidation layer and reduce hysteresis loss by adding Ce and Sn, purifying steel, and micro-alloying to improve the strength and magnetic properties of the non-oriented silicon steel, can increase the proportion of beneficial texture by sectional control of annealing temperature process, has smaller grains and beneficial texture, optimizes grain size uniformity, and makes the produced non-oriented electrical steel have favorable medium-high frequency iron loss, higher yield strength and good magnetic induction.

This utility model discloses an auxiliary shielding plug for anodizing aluminum alloy tubular profiles, comprising: an exhaust pipe with an internal mounting ring, wherein at least one side of the mounting ring is provided with a nano-hydrophobic film; a sealing structure, sleeved on the exhaust pipe, for sealing the annular space between the exhaust pipe and the inner wall of the aluminum alloy tubular profile; and a conductive structure, disposed on the exhaust pipe, serving as a connecting conductor between the aluminum alloy tubular profile and the bracket. This utility model, by providing a nano-hydrophobic film inside the exhaust pipe, allows gas to pass through the nano-hydrophobic film and exit the aluminum alloy tubular profile when the gas pressure inside the exhaust pipe increases, preventing excessively high gas pressure inside the aluminum alloy tubular profile; simultaneously, external anodizing liquid cannot pass through the nano-hydrophobic film to enter the aluminum alloy tubular profile, preventing internal oxidation of the aluminum alloy tubular profile.

This invention relates to the field of desulfurizing agent storage technology, and in particular to a desulfurizing agent storage device for wastewater treatment. The device includes a rotating assembly comprising a support pile, a first sleeve disposed on the outer wall of the support pile, a flared groove disposed on the outer wall of the first sleeve, and a second sleeve disposed on the outer wall of the first sleeve; and a tilting assembly comprising a storage tank disposed on the outer wall of the second sleeve, a piston block disposed inside the storage tank, a blocking plate disposed inside the storage tank, a feed inlet disposed on the end face of the blocking plate, and a rotating component disposed on the outer wall of the storage tank. The beneficial effects of this invention are that it combines ventilation and heat dissipation with sealed storage through heat conduction, ensuring that no heat accumulates inside and no oxidation occurs during storage; simultaneously, the removable cover achieves internal sealing, reducing the internal oxygen concentration and minimizing internal oxidation.

An internal oxidation starting temperature, estimation device estimates an internal oxidation starting temperature which is a minimum temperature required for an internal oxide layer to grow on a surface of an easily oxidizable element-containing hot-rolled steel sheet including Si, Mn, or Al or any combination thereof. The internal oxidation starting temperature estimation device includes an internal, oxidation starting temperature estimation unit that estimates the internal oxidation starting temperature on the basis of concentrations of the Si, the Mn, and the Al included in the easily oxidizable element-containing hot-rolled steel sheet.

Provided are an ultra-high strength galvanized steel sheet having excellent weldability and a method of manufacturing the same. According to an embodiment of the present invention, the ultra-high strength galvanized steel sheet includes: a steel sheet base material including, in weight percent, carbon (C): 0.1% to 0.3%, silicon (Si): 1.0% to 2.0%, manganese (Mn): 2.5% to 3.5%, aluminum (Al): 0.05% or less (including 0%), chromium (Cr): 1.0% or less (including 0%), molybdenum (Mo): 0.2% or less (including 0%), titanium + niobium + vanadium (Ti+Nb+V): 0.05% or less (including 0%), and the balance of iron (Fe) and other inevitable impurities; an iron coating layer formed on a surface of the steel sheet base material; and a hot-dip galvanized layer formed on a surface of the iron coating layer, wherein an internal oxide is formed at an interface between the steel sheet base material and the iron coating layer, thereby inhibiting the formation of an oxide at an interface between the iron coating layer and the hot-dip galvanized layer, and the internal oxide is spherical.

This application discloses an alumina dispersion-strengthened copper alloy, its preparation method, and its application, belonging to the field of metal matrix composite technology. The preparation method of the alumina dispersion-strengthened copper alloy provided in this application includes: melting copper, aluminum, and silver, and preparing alloy powder by water atomization; the alloy powder comprises components in the following mass percentages: aluminum 0.1%-0.4%, silver 0.1%-0.4%, oxygen content less than 0.03%, and the balance being copper; mixing the alloy powder with an oxidant and then performing cold isostatic pressing to obtain a preliminary billet; subjecting the preliminary billet to internal oxidation, reduction, hot isostatic pressing, and hot extrusion to obtain an alloy rod; and subjecting the alloy rod to hot deformation treatment to obtain the alumina dispersion-strengthened copper alloy. The alumina dispersion-strengthened copper alloy prepared by the method provided in this application significantly improves the bending performance and overall plasticity of the material while maintaining high strength.

A preparation method of a low-temperature-rise silver / tin-doped indium oxide contact material, comprising the following steps: (1) smelting; (2) ingot casting; (3) surface treatment; (4) sintering; (5) extrusion forming; (6) welding; (7) hot rolling; (8) cold rolling; (9) annealing; (10) internal oxidation: oxygen is introduced, the oxygen pressure is controlled to be 0.7-0.9 MPa, then the temperature is raised to 720-780 DEG C, and the temperature is kept for 25-35 hours, and the silver / tin-doped indium oxide composite sheet is obtained. The silver block, tin block and indium block are directly used as raw materials, the pre-alloyed powder or oxide powder with a higher price is replaced, the material cost is reduced from the source, through high-temperature smelting and controllable internal oxidation, the complete alloying and uniform solidification of silver, tin and indium are realized, the uniform dispersion distribution of the oxide in the silver matrix is realized, the micro defect aggregation caused by uneven powder mixing in the powder metallurgy method is effectively avoided, and the consistency, stability and reliability of the material structure are improved.