16results about How to "Reduce inclusions" patented technology

This utility model relates to a cooling and dust removal system for an overhead crane electrical compartment, belonging to the technical field of cooling and dust removal equipment. The technical solution of this utility model is as follows: the lower end of a PVC pipe (1) is connected to the atmosphere; a three-way filter (2) is sealed to the PVC pipe (1); the three-way filter (2), the serpentine condenser (3), and the suction fan (4) are connected sequentially through the PVC pipe (1); an internal venturi tube (5) is connected to the exhaust port of the suction fan (4); the internal venturi tube (5), the electrical compartment (6), and the exhaust fan (7) are connected sequentially; and a dust filtration device (8) is connected to the outlet of the exhaust fan (7) through the PVC pipe (1). The beneficial effects of this utility model are: improving the efficiency and quality of cooling the electrical components in the electrical compartment, ensuring the stability of the cooling process; at the same time, improving the working environment of the electrical compartment, reducing the dust contamination in the cold air and the dust in the exhaust heat, ensuring the stability of the production line control and the cleanliness of the site environment.

This invention relates to the field of gray cast iron material preparation technology, and particularly to a method for preparing multi-alloy synergistically strengthened gray cast iron, comprising: adding steel raw materials to a smelting apparatus and heating to form molten iron; adding a chromium alloy to the molten iron, heating and holding at that temperature to form a basic mixture; determining the degree of furnace lining peeling based on the vibration frequency of the smelting apparatus, and determining the overheating risk level of the basic mixture based on the degree of furnace lining peeling; determining a target heating temperature based on the overheating risk level; determining the eddy current risk level based on the actual rotation speed; adjusting the stirring intensity during the smelting process based on the eddy current risk level; detecting the mixing ratio of the basic mixture and adjusting the amount of steel raw materials or the chromium alloy added to form a target solution; and simultaneously adding manganese nitride, alloyed tin, and ferrous sulfide to the target solution in a specified ratio to form multi-alloy synergistically strengthened gray cast iron. This invention improves the strength, toughness, fluidity, and resistance to solidification defects of gray cast iron.

The application discloses a copper-aluminum composite pipe blank preparation device and method based on bidirectional cooling control, and belongs to the technical field of metal composite solid-liquid casting. The device comprises coaxially arranged inner and outer crystallizers, a positioning base, an aluminum pipe outer mold and a split runner. The aluminum pipe and the inner crystallizer form an annular casting cavity, and the inner and outer crystallizers are provided with bidirectional cooling channels. The method comprises coaxial assembly, copper melt smelting in a protective atmosphere, split uniform casting and inner-outer cooperative forced cooling. The application precisely regulates the temperature field through bidirectional cooling, shortens the high-temperature contact time of copper and aluminum, suppresses the growth of brittle intermetallic compounds, reduces interface oxidation, pores and inclusions and improves the metallurgical bonding strength. The device structure is simple, the specification is adjustable, the production efficiency is high, the problems of poor interface bonding and many defects in traditional composite pipe preparation are effectively solved, and the device is suitable for the industrialized production of copper-aluminum composite pipe blanks in the fields of electric power and automobiles.

The invention discloses battery-grade lithium carbonate as well as a preparation method and application thereof, and the preparation method comprises the following steps: synchronously introducing a lithium-containing solution and carbon dioxide bubble water into a reaction device, and reacting to obtain lithium carbonate; the carbon dioxide bubble water is prepared by adopting the following method: simultaneously introducing carbon dioxide and water into a shear pump, and shearing and mixing to prepare the carbon dioxide bubble water. According to the method, the traditional gas-liquid reaction that carbon dioxide is directly introduced into the lithium-containing solution is creatively transformed into a gas-liquid-liquid reaction system that carbon dioxide bubble water prepared in advance and the lithium-containing solution are synchronously introduced, so that the product purity and stability are remarkably improved, and the bottleneck of a traditional intermittent process is broken through; the preparation method is simple, the production capacity and efficiency are remarkably improved, industrial large-scale production is easy to realize, and the obtained product lithium carbonate crystal is complete in growth, concentrated and controllable in particle size distribution and regular in morphology, and meets the processing requirements of high-end battery materials.

The utility model belongs to the field of vegetable cleaning, specifically is a kind of vegetable cleaning and removing mud device, including sink;The inside mounting frame of sink, the frame is inclined to be arranged, the inside rotationally connected of frame has multiple drive rolls, drive roll is installed with mesh belt, the surface of mesh belt is evenly fixed with mesh plate, the top of frame is fixed with motor, the output end of motor and drive roll are fixed, the bottom of frame is inserted into the bottom of sink;Staff pours the vegetable picked into the upper side of mesh belt, mesh belt movement is along with mesh plate to promote vegetable to move, lower vegetable is soaked into the inside of sink, and the soil inside the gap of leaf blade can be conveniently discharged in soaking and cleaning, and it is soaked and cleaned in cooperation with spraying, vegetable leaves water surface, clean water is sprayed and cleaned to spray and clean, rely on above-mentioned structure, so it can improve cleaning effect, reduce the soil mixed in the inside of leaf blade, improve cleaning effect.

The invention relates to the technical field of steel smelting, in particular to a method for preparing high-cleanliness ultra-low carbon steel from semisteel. The method comprises the procedures of converter tapping, RH refining and slab continuous casting. A ladle slag modifier is added in the converter tapping process; in the RH refining process, deoxidation alloying and adding of composite desulfurization modifier balls are sequentially carried out, so that desulfurization and inclusion modification are synchronously realized. By means of the specific ladle slag modifier, the unique double-layer composite desulfurization modifier ball and the matched refining process, the problems of deep desulfurization and high cleanliness control during ultra-low carbon steel smelting through semi-steel are successfully solved, the technical effect is remarkable, and the method is superior to a conventional process.

The application discloses a high-aluminum steel continuous casting method, which adopts zirconium drainage sand in a ladle to reduce the reaction between the drainage sand and molten steel, and adopts a tundish cover argon blowing technology to blow argon on the tundish cover hole or in the tundish cover refractory, so that the oxygen content of the atmosphere in the tundish is reduced from 17-21% to below 0.1%, and a large amount of secondary oxidation caused by air in the first furnace opening and the subsequent continuous casting process is avoided. The method greatly reduces the reaction between aluminum in the high-aluminum steel and the drainage sand and air, reduces the alloy element burning loss, reduces the Al2O3 inclusions, is beneficial to improving the quality of the final product, greatly reduces the nozzle clogging rate, makes the production more stable, increases the continuous casting furnace number, reduces the contact between the molten steel and air, and significantly reduces the nitrogen increase.

The utility model provides a kind of welding device, including mounting seat, and welding cavity is equipped in mounting seat;Mounting seat is equipped with first installation port and second installation port;Multiple first clamps are detachably embedded in first installation port, the shape of the first clamping hole of each first clamp is different, and first shape pipe can be inserted into welding cavity through first clamping hole;Multiple second clamps are detachably embedded in second installation port, the shape of the second clamping hole of each second clamp is different, and second shape pipe can be inserted into welding cavity through second clamping hole;Heating assembly;When a first clamp is embedded in first installation port and a second clamp is embedded in second installation port, first clamp, second clamp and mounting seat form welding cavity;Part of heat generated by heating assembly is transmitted to welding cavity through mounting seat, and part of heat is transmitted to first clamp and second clamp to heat first shape pipe and second shape pipe.The present welding device is suitable for brazing of pipe fittings with different shapes and sizes.

This invention discloses a high-temperature oxidation-resistant and corrosion-resistant coating, its preparation method, and its application. The coating comprises a NiCrAlY alloy binder layer and a YSZ ceramic layer. The NiCrAlY layer contains 19-23% Cr, 3-5% Al, 0.01-0.9% Y, with the balance being Ni. The YSZ layer is ZrO2 doped with 5-8 wt% Y2O3. The thickness of the NiCrAlY layer is 50-150 μm, and the ratio of the thickness of the YSZ layer to the thickness of the NiCrAlY layer is (1-2.5):1. By combining the properties of the NiCrAlY and YSZ layers with the spraying process, the above coating can effectively suppress metal oxidation during spraying, reduce oxide inclusions, and improve the purity and toughness of the coating. Furthermore, by considering the coating composition and structure, it can suppress the YSZ phase transformation, delay TGO growth, and improve the coating's anti-sintering properties.

The application discloses a high-aluminum high-manganese steel and a preparation method thereof. The method comprises the following steps: providing desulfurized molten iron; performing converter smelting on the desulfurized molten iron to obtain converter molten steel; performing LF refining on the converter molten steel to obtain LF refined molten steel; performing RH refining on the LF refined molten steel to obtain RH refined molten steel; and performing continuous casting pouring on the RH refined molten steel to obtain a continuous casting billet. The preparation method of the high-aluminum high-manganese steel can effectively solve the problem that AlN is precipitated and gathered at a grain boundary, the grain boundary is embrittled, the continuous casting billet has many cracks, and the rejection rate of rolled products is high.

The invention discloses a preparation method of die steel for a car lamp die, and belongs to the technical field of die steel preparation. The die steel is composed of matrix steel, a modified nano titanium carbide strengthening phase and a modified rare earth oxide complexing agent. The steel matrix comprises, by mass, 0.45% of carbon, 0.8% of silicon, 1.2% of manganese, 13.5% of chromium, 2.0% of molybdenum, 0.6% of vanadium, 1.5% of nickel and 0.3% of niobium. The other components comprise, by mass, 1.0% of a modified nano titanium carbide strengthening phase and 0.2% of a modified rare earth oxide complexing agent; and the balance of iron. According to the invention, the three materials of the matrix steel, the nano titanium carbide strengthening phase and the rare earth oxide complexing agent are synergistically modified, so that a three-in-one innovative system of'modified matrix + strengthening phase enhancement + rare earth regulation 'is constructed, and synchronous improvement of hardness, toughness, polishing performance and corrosion resistance is realized; the technical bottleneck that traditional die steel is poor in performance collaboration is solved.

The invention discloses a secondary aluminum composition which comprises basic components, impurities and aluminum, wherein the basic components comprise strontium, copper, iron, magnesium, silicon, carbon, titanium, vanadium and boron, and the content of the basic components is smaller than 15%; the content of the impurities is less than 0.9%; the invention relates to the technical field of secondary aluminum production, in the smelting process, fluoride can be adsorbed and the discharge rate of the fluoride can be reduced by using activated aluminum oxide, at the moment, rare earth elements and the fluoride can react to generate rare earth fluoride, and the rare earth fluoride can form second-phase particles containing rare earth in molten aluminum, so that the secondary aluminum is obtained. A good foundation is laid for follow-up structure and performance regulation and control, non-metallic inclusions are reduced, the surface tension, fluidity and viscosity of a melt are improved, and the effects of inclusion spheroidization and floating removal are facilitated.

This invention belongs to the field of electronic packaging heat dissipation materials technology, and relates to a Bi-Sn-In system low-melting-point alloy thermal interface material and its preparation method. The material is composed of 53% Bi, 42% Sn, and 5% In by mass percentage. The preparation method includes: melting the raw materials at 300-350℃ under high-purity argon protection, followed by cooling at a rate of 5-10℃ / min to obtain a composite structure with a primary Bi-rich dendritic framework and an intergranular low-melting-point eutectic phase; then performing a low-temperature stabilization treatment at 100-110℃. This process enables the material to form a stable composite structure of "solid dendritic network + liquid eutectic phase" within the semi-solid working range, where the solid dendritic network provides mechanical support and inhibits pumping out, and the liquid eutectic phase ensures excellent thermal interface wetting and heat transfer performance. The material prepared by this method has a low melting point, high thermal conductivity, and good dimensional stability. The process is simple and suitable for the industrial production of heat dissipation interfaces for electronic devices.

The application relates to a torsion beam steel and a preparation method thereof, and the chemical components of the torsion beam steel include the following contents: the content of C is 0.05-0.08%, the content of Si is <=0.15%, the content of Mn is 1.2-1.7%, the content of P is <=0.015%, the content of S is <=0.003%, the content of Nb is 0.01-0.05%, the content of Ti is 0.03-0.08%, the content of Cr is 0.1%-0.4%, the content of Mo is 0.1-0.25%, the content of V is 0.01-0.04%, and the content of Ca is 0.0005-0.005%; and the following conditions are met: [Ti] / [Mo] <=0.6, and [Cr]+[Mo] = 0.2-0.5%; the microstructure of the torsion beam steel includes ferrite and bainite. The torsion beam steel has the advantages that the tensile strength is >=650 MPa, the hole expansion rate lambda is >=85%, and the elongation A80 is >=24%.

This invention discloses a nickel-tantalum master alloy, comprising, by mass percentage: 40.0%–50.0% nickel, with the balance being tantalum and unavoidable impurities. The nickel-tantalum master alloy is prepared from nickel foil, nickel suboxide, tantalum pentoxide, aluminum powder, and calcium granules. The specific preparation method is as follows: nickel suboxide, tantalum pentoxide, and aluminum powder are mixed uniformly to obtain a mixture; calcium granules are spread evenly at the bottom of a crucible in a vacuum aluminothermic reaction furnace, and a layer of calcium oxide slurry is coated onto the inner wall of the crucible. After drying, the mixture is added to perform a vacuum aluminothermic / calcothermic reduction reaction to obtain a nickel-tantalum alloy liquid. After cooling, a primary nickel-tantalum alloy is obtained; tantalum pentoxide is wrapped in nickel foil to form multiple bales; the primary nickel-tantalum alloy is crushed, and the wrapped bales and crushed primary nickel-tantalum alloy are melted in a vacuum electron beam furnace; the melted alloy liquid is cooled to obtain the nickel-tantalum master alloy. The nickel-tantalum master alloy obtained by this invention has high uniformity and high purity.

The utility model relates to the technical field of conveying devices, and discloses a platycodon grandiflorum carrying and conveying device which comprises a supporting frame, a conveying belt is arranged in the supporting frame, a PLC is fixedly installed on one side of the supporting frame, and the platycodon grandiflorum carrying and conveying device further comprises a dust removal assembly used for conducting dust removal on platycodon grandiflorum pieces. The collecting bin, the bag-type dust remover, the brush roller and the like are used in cooperation, the dust removal effect on platycodon grandiflorum pieces can be achieved, dust is carried into the collecting bin through ascending airflow, the bag-type dust remover sucks air in the collecting bin through the connecting pipe and filters the air, dust mixed in the platycodon grandiflorum pieces is effectively reduced, and the dust removal efficiency is improved. Residual dust on the surface of the conveying belt is secondarily swept into the dust collecting hopper and the dust storage bin through the rotating brush roller to be collected, material damage is reduced through reverse airflow buffering, efficient cleaning is achieved through airflow dust removal, static electricity elimination and mechanical sweeping from bottom to top, the conveying effect of platycodon grandiflorum pieces is guaranteed, and the industrial production requirement is met.