85results about How to "Guaranteed high temperature strength" patented technology

The invention belongs to the technical field of metallurgy, and provides a large-diameter seamless steel tube for high-pressure gas cylinders and a manufacturing method thereof. The large-diameter seamless steel tube for high-pressure gas cylinders comprises the following chemical components in percentage by mass: 0.30-0.60% of C, 0.20-0.50% of Si, 0.20-0.60% of Mn, at most 0.010% of P, at most 0.010% of S, 0.90-1.70% of Cr, 2.50-3.50% of Ni, 0.25-0.55% of Mo, 0.05-0.25% of V and the balance of Fe. The manufacturing method adopts spongy iron and scrap steel as raw materials for steelmaking. The large-diameter seamless steel tube has the advantages of high heat stability, high strength, impact toughness, stable enduring plasticity, high heat resistance, excellent corrosion resistance and excellent fatigue resistance, and the yield strength is not lower than 1000 MPa.

The invention discloses a non-phosphorus and low-carbon alumina-magnesia unburned brick for a stainless steel ladle and a manufacturing method of the brick. The non-phosphorus and low-carbon alumina-magnesia unburned brick comprises the following components by mass percentage: 15-20% of 5-3mm bauxite, 20-25% of 3-1mm bauxite, 10-15% of bauxite less than or equal to 1mm in particle size, 10-15% of 3-1mm fused magnesite, 5-10% of fused magnesite less than or equal to 1mm in particle size, 10-15% of emery powder, 15-20% of spinel powder, 2-5% of aluminum oxide micropowder less than or equal to 25 micrometers, 0.1-2% of silicon carbide additive, 0.1-2% of wetting agent and a phenolic resin binding agent. Compared with the prior art, the brick and the method have the prominent advantages that a burning technology in the conventional method is omitted, energy sources are saved, the brick is free from phosphorus; aluminum and magnesium perform spinel reaction at the high temperature; and the brick is subjected to machine molding in the absence of the phosphorus, has higher density, avoids pollution of molten stainless steel, and has a longer service life.

The invention relates to a magnesia carbon brick and a preparation method thereof. The magnesia carbon brick is prepared from, by weight, 60%-75% of fused magnesite particles, 10%-30% of fused magnesite fine powder, 5%-10% of carbon, 1%-5% of an antioxidant, 1%-3% of a binding agent and 0.4%-1% of furfural waste liquid. In the preparation process, the fused magnesite particles are placed in a mixing mill to be dry-mixed for 2-15 min, then phenolic resin and the furfural waste liquid are added to continue to be mixed for 5-15 min, then carbon is added to the mixture, mixing is carried out for 5-15 min, finally the fused magnesite fine powder and the antioxidant are added to continue to be mixed for 8-15 min, pug is formed, the rotating speed of the mixing mill is set to range from 950 r/min to 1,000 r/min, mixing time ranges from 10 min to 60 min, and the magnesia carbon brick is prepared after compression moulding and drying solidification. The preparation method is simple, the steps are easy to operate, the uniformity of mixed materials of the magnesia carbon brick is improved, the quality of the mixed materials of the magnesia carbon brick is improved, the labor intensity of workers is lowered, the use amount of phenolic resin is reduced, and due to the addition of the furfural waste liquid, the material mixing process is more even, and phenolic resin is prevented from being caked.

The gas phase medium gasifying nozzle includes gasified medium inlet pipe with flange and corresponding fixed multiple flow channel spray tube with integrated nozzle, and features the equal wall thickness connection between the spray tube and the nozzle with smooth transition, the nozzle with conic outer and inner walls, and nozzle end wall thickness of 1-4 mm. The reasonable arrangement of gasifying nozzles, arced gasifying furnace top and furnace mouth structure forms the optimal flow field and temperature field matching reaching best gasifying effect with effective gas component over 95.5 % and up to 96.3 %. The present invention has prolonged gasifying nozzle life.

The invention discloses a self-brazing aluminum alloy foil, consisting of the following components in percentage by mass: 0.2-0.4% of Fe, 2.1-2.3% of Si, 1.25-1.45% of Mn, 1.4-1.6% of Zn, 0.3-0.4% ofCu, 0.01-0.02% of Ti, 0.03-0.07% of RE, 0.03-0.07% of Zr, and the balance of Al. The thickness of the self-brazing aluminum alloy foil is 0.05-0.10 mm. The invention further discloses a preparation method for the self-brazing aluminum alloy foil. The self-brazing aluminum alloy foil is a single-layer foil, can implement self-brazing, is high in tensile strength and yield strength after brazing, and is excellent in droop resistance.

The invention discloses zirconium-containing electrothermal alloy. The zirconium-containing electrothermal alloy comprises, by mass, 0-0.03% of carbon, 19-22% of chrome, 3.3-3.6% of aluminium, 0.35-0.43% of zirconium, 0-0.5% of silicon, 0.2-0.6% of titanium, 0-0.5% of manganese, 0-0.004% of magnesium, 0-0.01% of sulphur, 0-0.03% of phosphorus and the balance Fe. The invention further provides a method for preparing the zirconium-containing electrothermal alloy through vacuum induction melting and electroslag remelting. The initial slag system CaF2-CaO-MgO-Al2O3-ZrO2 is extracted during electroslag remelting, in the temperature rise period of the initial stage of remelting, Al2O3 powder is additionally added into the slag, therefore the content of zirconium in ingots is controlled precisely, and the zirconium is distributed evenly. According to the alloy and the preparation method, a right amount of zirconium is added into the electrothermal alloy, so that the high-temperature oxidationresistance of the electrothermal alloy is improved, and the high-quality effect is achieved through process control.

The invention discloses a manufacturing method for double-grain-size-distribution oxide dispersion strengthening ferrite steel, and belongs to the field of metal materials. The double-grain-size-distribution oxide dispersion strengthening ferrite steel comprises the components of (5-10)wt.% of Cr, (1.5-2)wt.% of W, (6-10.5)wt.% of Al, (0.1-0.4)wt.% of V, (0.25-0.5)wt.% of Y2O3 and less than 0.01wt.% of C and N; the oxygen content of atomization powder is less than 0.05wt.%; the atomization powder with the particle size of 200-400 meshes, Al powder with the particle size of 400 meshes and Y2O3powder with the particle size of 20-50 nanometers are mechanically alloyed; the powders are packed and sealed with a low-carbon steel packing sheathe; hot isostatic pressure sintering is performed; the powders are heated, and pressurization is performed at 800 DEG C; and a two-stage sintering mode is adopted. The tensile strength of the obtained strengthened steel is over 820 MPa, and the total ductility is larger than 16%; the tensile strength at 650 DEG C is not lower than 500 MPa, and the total ductility is not lower than 15%.

The invention relates to an electric boosting electrode device, in particular to an electrode device with a cooling and insulating structure, and belongs to the field of glass production tank furnace melting. The electrode device consists of an electrode head (1), an insulated sleeve (2) and a cooling water pipeline (3), wherein the cooling water pipeline (3) is simultaneously used as a lead of the electrode device; and the electrode device is inserted into a specific position in molten glass, the insulated sleeve (2) is connected with the molten glass and the tank bottom (or the tank wall) on the premise of internal cooling, and the insulated sleeve (2) plays a role in protecting the refractory material of the tank bottom (or the tank wall) around the insertion hole of the electrode device under the conditions of high temperature and strong convection around the electrode head (1).

The invention relates to a preparation method of an alumina ceramic shell for monocrystal blades. Ethyl silicate slurry is utilized to prepare a shell, of which the layer structure is provided with at least five layers. The method comprises steps as follows: 1) the first layer of the shell uses ethyl silicate slurry prepared by one of the following two schemes: Scheme 1: adding fused alumina fine powder with the particle size of 1000-230# into ethyl silicate, wherein the viscosity is fai4 by flow cup viscosity, and the flow clean time is 57-62 seconds; Scheme 2: adding ZrSO4 powder with the particle size of 200-325# into ethyl silicate, wherein the viscosity is fai4 by flow cup viscosity, and the flow clean time is 65-70 seconds; 2) the ethyl silicate slurry for the rest layers of the shell except the first layer satisfies the formula and preparation sequence requirements of the Scheme 1, wherein the viscosity of the mixture obtained by stirring is fai4 by flow cup viscosity, and the flow clean time is 30-35 seconds; and after the slurries are sequentially coated on the wax mold, the shell is roasted at 500-1000 DEG C DEG C for 3-15 hours, and is cooled in the furnace. The method provided by the invention can be utilized to obtain the excellent-performance ceramic shell which has the advantages of moderate thickness, favorable thermal shock resistance and good air permeability.

The invention discloses a shell making process of a silica sol shell with high deshelling property. The shell making process comprises the following steps: S1, uniformly mixing powder with silica solwith stirring, and adding a wetting agent and a defoamer to form a first mixture; S2, immersing a wax mold into the first mixture, taking the wax mold out, scattering sand into the wax mold, and drying to obtain a first-layer mold shell; S3, repeating the step S2 until second to sixth layers of mold shells are obtained; S4, drying the wax mold including the first to sixth layers of mold shells tocomplete sealing; S5, calcining the wax mold including the first to sixth layers of mold shells to obtain a mold shell casting. According to the shell making process of the silica sol shell with highdeshelling property disclosed by the invention, fully-calcined aluminosilicate refractory sand powder, free iron and hard kaolinite with low diaspore content is taken as a main material of the silicasol shell, and is combined skillfully with quartz sand, so that the high-temperature strength of the mold shell is ensured, and the retained strength after mold shell pouring can be lowered greatly.

The invention relates to a carbon composite fireproof material for blast furnace iron runner and a preparation method thereof. The material is made of graphite (C), Al, Si, SiC, corundum, magnesite, and vf-SiO2, wherein the weight ratio of the total weight of graphite (C), Al, Si, and SiC to the total weight of corundum, magnesite, and vf-SiO2 is 1:1. The material is prepared by the following steps: adding silica sol accounting for 10% of the total weight of raw materials, blending, forming, carrying out a hardening treatment, grinding, and finally packaging into bags so as to obtain the finished products. The casting material for blast furnace iron runner maintains the characteristics of high temperature strength, scrubbing resistance, and corrosion resistance of common fireproof material and at the same time has a certain degree of toughness like metal materials. During the melt iron discharging process, the material is subjected to cool-heat circulation, can tolerate fierce temperature fluctuation impact, can maintain a stable volume, and is not easy to peel off, so the service life of the iron runner is prolonged.

The invention discloses special casting materials for triangular area prefabricated components of an electric arc furnace roof. The special casting materials are prepared from the following raw materials: 20-35 parts of highly pure aluminum bauxite, 10-25 parts of tabular corundum, 15-32 parts of chromium corundum, 3-5 parts of spinel fine powder, 1.5-2.5 parts of kyanite, 5-9 parts of active aluminum oxide micro powder, 1-3 parts of chromium oxide green fine powder, 2-4 parts of silicon micro powder, 3.11-5.25 parts of a bonding agent, 0.03-0.06 part of organic fibers and 0.5-1 part of stainless steel fibers. According to the special casting materials disclosed by the invention, scientific grain size distribution is adopted for main body granules, so that the triangular area prefabricatedcomponents are guaranteed to have good high temperature strength and good hot vibration stability; materials of the spinel micro powder, pure calcium aluminate cement, active aluminum oxide and chromium oxide green and the like, which are added, are compounded, and after casting moulding and baking, a high-strength low-temperature solidified combination liner is formed, so that the compactabilityand the volume stability of the prefabricated components are guaranteed; the chromium corundum (Al2O3+Cr2O3 greater than or equal to 95%) in the raw materials is slag for smelting electrofusion chromium metal; through the use of the raw materials, the cost of products can be reduced, discharge of industrial waste can be reduced, and cyclic utilization of the industrial waste can be effectively realized.

The invention discloses a long-service-life high-strength hot-corrosion-resistant nickel-based superalloy. The nickel-based superalloy comprises the following components in percentage by weight of 18.0%-19.9% of Cr, 18.0% to 25.0% of Co, 1.6%-2.8% of Al, 3.1%-4.5% of Ti, 0.1%-0.5% of Ta, 3.1%-4.9% of W, 0%-1.20% of Mo, 0.7%-1.7% of Nb, 0.005% to 0.15% of C, 0.003%-0.03% of B, 0.005% to 0.08% of Zr, and the balance Ni. Through component design optimization of the alloy, the thermal corrosion resistance and the high-temperature strength of the alloy are guaranteed, and meanwhile the long-life structure stability of the alloy is improved. The alloy disclosed by the invention is suitable for manufacturing hot-end parts of gas turbines and can be used for thousands of hours for a long time in agas corrosion environment.

The invention discloses an alloy material of a valve and the valve. The alloy material of the valve is prepared from, by weight, 0.45%-0.55% of C, 0-0.45% of Si, 8.00%-10.00% of Mn, 0-0.050% of P, 0-0.030% of S, 25.00%-27.00% of Cr, 3.50%-5.0% of Ni, 0.40%-0.60% of N, 0.80%-1.50% of W, 1.80%-2.50% of Nb and the balance Fe. The oxidation resistance, the high-temperature strength and the creep resistance of the alloy material can meet the actual working condition requirements of an exhaust valve, and the cost is not increased substantially. Besides, the alloy material is particularly applicableto preparation of hollow valves.

The invention relates to a coating material for preventing carbon deposition for a coke tank lining plate. The coating material comprises the following raw materials in percentage by weight: 20-30% of mullite aggregate, 5-15% of silicon carbide, 5-12% of mullite micro-powder aggregate, 5-10% of andalusite, 25-35% of mullite, 5-15% of silicon carbide, 0.1-5% of boron nitride, 1-5% of metal silicon powder, 1-8% of organic silicone resin solution, 3-8% of microcrystalline glass powder, 5-15% of silica sol with a silicon oxide content of 32-40%, and 0.01-1% of sodium polyacrylate. The use method comprises the following steps of: arranging a stainless steel wire mesh after anchoring nails are nailed at a to-be-smeared coke pot lining plate part; welding the stainless steel wire mesh to the anchoring nails in parallel; coating the stainless steel wire mesh with the coating material until the stainless steel wire mesh is completely coated; collecting pulp by using plastic fiber cloth; naturally air-drying; heating; preserving heat; and keeping for later use. The service lifetime of the coke pot lining plate can be prolonged from 3-6 months to at least 7 months by the coating material, and the temperature of the outer surface of the coke pot shell is reduced by 150-300 DEG C.

The invention provides a preparation method of a clay quartz crucible for high-temperature alloy casting. The preparation method comprises the following steps: preparing pug, refining the pug, molding, drying and sintering. The pug comprises a basic material and water, and the basic material comprises the following components in percentage by mass: 25-30% of ball clay powder; 40-50% of quartz glass powder; 20-25% of white corundum powder; and 1%-5% of mullite powder. According to the clay quartz crucible, the raw material variety, the adding proportion and the raw material granularity are reasonably controlled; the adverse effect of clay on the thermal stability of the crucible is avoided, the problem that a pure quartz crucible cannot be plastically formed is solved, the requirements of high-temperature alloy on the use temperature and thermal shock resistance of the crucible are met, meanwhile, the sintering temperature of the crucible is 500 DEG C lower than that of a traditional magnesium crucible, and the sintering condition is easier to meet.

The invention discloses 350 DEG C-resistant thermosetting polyimide aerogel and a preparation method thereof, and relates to polyimide aerogel and a preparation method thereof. The problems that existing polyimide aerogel is low in temperature resistance and high-temperature strength are solved. The 350 DEG C-resistant thermosetting polyimide aerogel is prepared from tertiary amine, aromatic diamine, aromatic dianhydride, an end-capping reagent and a solvent, the preparation method comprises the following steps: 1, weighing; 2, adding a solvent and p-phenylenediamine into a three-necked bottle for reaction under the conditions of nitrogen atmosphere, certain temperature and stirring, heating, adding aromatic dianhydride, fluorenyl-containing diamine and tertiary amine, stirring for reaction, finally adding an end-capping reagent, cooling and standing; 3, freeze-drying; and 4, carrying out thermal imidization reaction.

The invention discloses a gypsum shell low in retained strength and a preparing method of the gypsum shell. Gelatin is contained in the gypsum shell. The method comprises the steps that gypsum powderand filler are evenly mixed; after water is heated, the gelatin is added in the water, uniform mixing is conducted, and a transparent solution is obtained; gypsum powder and filler mixed powder is added in the transparent solution, and slurry is obtained; the slurry is poured into a die; after the slurry in the die is hardened, the die is dismounted, standing is conducted at the room temperature,and a wet gypsum shell is obtained; and the wet gypsum shell is naturally dried and roasted, and the gypsum shell low in retained strength is obtained. The gypsum shell is low in retained strength andeasy to clean, the preparing method is simple, and the production efficiency is high.