65results about How to "Good thermal fatigue resistance" patented technology

A flux-cored welding wire for the build-up welding of conticast roller in order to improve its antiwear, anticorrosion and hot fatigue resistant properties contains proportionally C, Si, Mn, Cr, Ni, V, Nb, Ti, W, N, Al, and one or more of Cu, Re and Mo.

The invention discloses a high-hardness flux-cored welding wire for overlaying repair of a continuous casting roller, and belongs to the technical field of welding in material processing engineering. An H08A cold-rolled steel strip is adopted as an outer cover, a flux core comprises the following components in percentage by weight: 20-40% of TiO2, 5-15% of high-carbon ferrochrome, 12-30% of low-carbon ferrochrome, 0.5-5% of Mn-Si alloy, 0.5-5% of Al-Mg alloy, 5-15% of Ni, 0.5-2.5% of fluoride, 5-15% of Mo, 0.5-2.5% of V, 2-10% of Cr, 0.5-5% of Al2O3 and the balance of iron powder. The filling rate of the traditional Chinese medicine core of the flux-cored welding wire is 20-35%. The welding wire has the advantages that the flux-cored welding wire adopts a self-protecting overlaying manner, and shielding gas and welding flux are not needed in the overlaying repair process of the continuous casting roller, so that the repair cost can be greatly reduced, the manual labor intensity is lowered, and the production efficiency is improved; the welding wire has good arc stability, excellent abrasion-proof property and excellent thermal fatigue resistant property, and the service life of the continuous casting roller is effectively prolonged.

The invention discloses a composite resurfacing welding method for a sink roller and a stabilizing roller used for hot dipping. Substrates of the sink roller and the stabilizing roller are made of a stainless steel iron-based material, and the substrates are provided with cobalt-base alloy working surfaces in a resurfacing welding mode. The method comprises the following steps: preheating the manufactured substrate of the sink roller or the stabilizing roller to 500 to 650 DEG C, and keeping the temperature for 1 to 3 hours; slowly cooling the temperature of the substrate to 250 to 350 DEG C at a speed of 50 to 150 DEG per hour, and forming a cobalt-base alloy material on the substrate in a resurfacing welding mode; performing heat treatment on the substrate to eliminate the stress; and finally performing rough machining, finish machining, balancing test and detection on the sink roller or the stabilizing roller. The sink roller and the stabilizing roller work under the conditions of hot-dip aluminium, aluminium-zinc, zinc-aluminium, zinc, pure aluminium liquid and the like, and have enough performances of resistance to heat, corrosion and wear; the substrates of the sink roller and the stabilizing roller and the working surfaces have high bonding strength; and the service life of the sink roller and the stabilizing roller is improved greatly, and is 2 to 3 times that of the prior product.

The invention discloses a nickel aluminum bronze plastic mould material. The nickel aluminum bronze plastic mould material comprises the following components by weight percent: 10-12% of Al, 3-5% of Ni, 3-5% of Fe, 1-2% of Mn, 0.2-0.3% of Ti, 0.2-0.3% of B, 0.05-0.1% of Zn and the balance of Cu. The material provided by the invention is high in compression strength and excellent in heat conduction, heat dissipation, thermal fatigue resistance, abrasive resistance and corrosion resistance; the service life of the mould is 3-6 times higher than that of the traditional iron alloy steel plastic mould material; the material is excellent in cold and heat process molding and smooth in mould processing surface, is used for high polymer plastic forming, is high in plastic product size precision, clear in ornamentation and beautiful on the surface and has higher performance than that of the iron alloy mould material. The invention also discloses a preparation method of the nickel aluminum bronze plastic mould material.

The invention relates to a T-shaped pipefitting element (10) comprising a main tubular branch (10a) having a first end for the connection thereof to a first pipefitting section (7) and a second end for the connection thereof to a second pipefitting section (6), a lateral branch (10b) having an axis which is at an angle to the axis of the main branch (10a), and a free end for connecting to a third pipefitting section (8) of the auxiliary circuit (1). The first, second, and third pipefitting sections (6,7,8) of the auxiliary circuit each ensure a different function to the two other sections, that is either the supply of the pipefitting element (10) with a first fluid at a high temperature, the supply of a second fluid to the pipefitting element (10), at a lower temperature than that of the first fluid, or the discharge of a mixture of the first and second fluids. The pipefittings (6,7,8) of the auxiliary circuit of the pressurised water nuclear reactor consist of austenitic stainless steel. The T-shaped pipefitting (10) consists of stainless martensitic steel with improved thermal endurance properties.

The invention relates to extra-coarse grain tungsten carbide powder with narrow particle size distribution and a preparation method thereof. In the tungsten carbide powder, a particle size of 80-90 weight percent of tungsten carbide powder is between 0.5D50 and 2D50, and D50 is a median diameter; the tungsten carbide powder of which the particle size is larger than 5D50 is less than 0.5 weight percent; the purity of the tungsten carbide powder is higher than or equal to 99.9 weight percent; the Fisher particle size of the tungsten carbide powder is more than or equal to 15mu m. X-ray diffraction phase analysis is performed after ball-milling and crushing treatment, and the tungsten carbide powder does not contain W2C or other mixed phases. The preparation method of the extra-coarse grain tungsten carbide powder with narrow particle size distribution comprises the following steps: performing high-temperature hydrogen reduction on tungsten oxide, crushing hard agglomerates of extra-coarse tungsten powder, carrying out size grading, carbon preparation, high-temperature carbonization, and crushing and screening the carbonized tungsten powder. An extra-coarse grain WC-Co hard alloy produced by the prepared tungsten carbide powder is uniform in organizational structure, an average grain size of a WC hard phase is coarse, and the comprehensive performance of the alloy is good.

The invention relates to a narrow-particle size distribution extra-coarse cemented carbide and a preparation method thereof. The extra-coarse cemented carbide is WC-Co cemented carbide, the dispersion of the particle size distribution of WC crystal grains is less than or equal to 1.5, specifically, the dispersion is equal to (D90-D10) / D50, wherein D90, D50 and D10 are particle sizes when the number cumulative distribution respectively reaches 90%, 50% and 10%; the average particle size D50 of WC crystal grains is 6 mu m-10 mu m; and the weight content of cobalt is 3%-16%. The hardness HV10 of the cemented carbide is 700-1100, and the bending strength of the cemented carbide is larger than 2000 MPa. The preparation method of the narrow-particle size distribution extra-coarse cemented carbide comprises fragmentation of extra-coarse tungsten carbide powder hard aggregate, particle size grading of tungsten carbide powder, magnetron sputtering cobalt coating of tungsten carbide powder, wet mixing, drying, compacting and sintering. The prepared extra-coarse WC-Co cemented carbide is uniform in texture structure, the average crystal grain size of WC hard phase is coarse, the crystal grain distribution is narrow, and the comprehensive performances of the cemented carbide is good.

The invention discloses a grate bar and a preparation method thereof, which belongs to the technical field of heat-resisting materials. The grate bar comprises the following chemical components in percentage by mass: 1.2 to 1.6 percent of C, 15.0 to 20.0 percent of Cr, 2.3 to 2.8 percent of Al, 4.5 to 5.0 percent of Si, 0.05 to 0.15 percent of Ti, 0.05 to 0.15 percent of Nb, 0.08 to 0.20 percent of RE, 0.06 to 0.15 percent of Mg, less than 0.6 percent of Mn, less than 0.04 percent of S, less than 0.05 percent of P and the balance of Fe, wherein the total mass of the Ti and the Nb is more than or equal to 0.20 percent and less than or equal to 0.28 percent. The grate bar of the invention can be produced by electric furnace and is formed by lost foam casting; the grate bar has high strength, high toughness, high inoxidizability and high thermal fatigue resistance, and can be used on large sintering machine trolley for more than 2 years; and when the grate bar is used, the labor intensity of workers can be relieved, the production efficiency of the sintering machine can be improved, and great social and economic benefit can be created.

The invention discloses a high-nickel copper alloy glass mold strengthening method. The high-nickel copper alloy glass mold strengthening method includes the following steps that S1, oxide and dirt onthe surface of a copper mold are removed; S2, transition layer powder is prepared, wherein nickel-based superalloy powder is evenly mixed with pure copper powder with the weight ratio being 15%-30%,and drying is carried out to obtain the transition layer powder; and strengthening layer powder is prepared, wherein nickel-based alloy powder is adopted and dried to obtain the strengthening layer powder; S3, the transition layer powder covers the copper mold in a fusion manner, and a fusion covering layer formed by fusion covering is a transition layer; S4, the strengthening layer powder coversthe transition layer in a fusion manner, and a fusion covering layer formed by fusion covering is a strengthening layer; and S5, and the strengthening layer is modified by machining. The high-nickel copper alloy glass mold strengthening method effectively prevents occurrence of welding cracks and improves the strength of joints; meanwhile, copper alloy oxidizing at high temperature during preheatwelding is avoided, and the high quality of the welding interior on the mold is effectively ensured; and the transition layer improves the weldability and the bonding strength of the copper alloy glass mold and the strengthening layer.

The invention discloses a high-hardness stainless steel pump valve casting resistant to high-temperature oxidization. The stainless steel casting is balanced in mechanical property, high in hardness, good in toughness, good in heat fatigue resistance, easy to machine and form, good in oxidization resistance in a high-temperature environment and longer in service life. Due to the fact that nano Ca-RE intermediate phase alloy powder carried by honeycomb ceramic powder and composite graphene refining agents are added in molten liquid, the heat stability is good, the material dispersion is more uniform in molten steel, the impurity removal efficiency and the slag melting efficiency are higher, and the purity degree of the molten steel can be effectively improved, so that alloy structure grains are fine and uniform, and the capacity resistant outside negative factors is high ; the casting subjected to heat treatment for multiple times is stable, and the energy-saving and efficient production effect is achieved.

In order to provide a large steel ring that is lighter and thereby contributes to improved fuel consumption, that has lower tensile strength, and has excellent wear resistance and scuffing resistance, and in order to also provide a raw material therefor and a production method for both, a large steel ring having reduced ring width (h1) and radial direction thickness (a1), and having a nominal diameter (d1) of at least 200 mm but less than 1,100 mm is obtained from a hot-forged cylindrical steel material by combining: steel including as compulsory alloy elements C, Si, Mn, and Cr, including as optional alloy elements Ni, V, and Mo, and having the thermal conductivity and / or resistance to thermal degradation thereof adjusted; and hot forging that includes a ring rolling step.

The invention discloses a high-strength, high-toughness and heat-resistant aluminum alloy material for an internal combustion engine. The aluminum alloy material is prepared from alloy elements in percentage by weight as follows: 9.0%-17.0% of Si, 2.0%-7.0% of Cu, 1.5%-5.5% of Ni, 0.6%-1.5% of Mg, 0.2%-1.1% of Fe, 0.2%-1.1% of Cr, 0.1%-0.3% of Ti, 0.15%-0.5% of B, 0.1%-0.3% of C, 0.08%-0.12% of P,0.4%-0.6% of RE (rare earth) elements, less than or equal to 0.3% of Zr, less than or equal to 0.3% of Sc and the balance Al. The invention further provides a preparation method of the aluminum alloymaterial, wherein briquettes containing B, Ti and Al mixed salt and briquettes containing Ti, Al and C mixed salt directly react in aluminum alloy melt to produce a micro-nano strengthening phase, and then the aluminum alloy material can be prepared.

The invention relates to a roller for a continuous induction type rapid quenching furnace and a manufacturing method of the roller, and belongs to the field of refractory metal powder metallurgy and deformation machining. The roller is made of pure molybdenum or REO doped molybdenum alloy materials, the outer diameter is 400-800 mm, the wall thickness is 15-60 mm, the relative density is not lower than 99.5%, and the tensile strength is not lower than 500 MPa. The manufacturing method comprises the following steps: by taking molybdenum and molybdenum alloy powder which are highly purified by a wet method or are uniformly doped with rare earth oxide by a liquid-liquid or solid-liquid method as raw materials, performing cold isostatic pressing to obtain a ring blank, performing hydrogen high-temperature sintering, performing rough turning, performing ring forging or closed die forging, performing hydrogen annealing treatment, and finally performing precision machining. The roller is uniform in component, high in density, good in strength and toughness and excellent in thermal fatigue resistance, serves as an important component of a large continuous induction type rapid quenching furnace as core equipment for rare earth bonded magnetic powder production, and can be extensively applied to development and production of iron-based soft magnetic amorphous alloy, thermoelectric materials and the like.

Provided is a high temperature thermoelectric converting module including a plurality of p type thermoelectric elements; a plurality of n type thermoelectric elements; a plurality of electrodes; and a lead line. The plurality of p type thermoelectric elements, the plurality of n type thermoelectric elements, and the plurality of electrodes are electrically serially connected to each other, a pair of connecting lines that connects the lead line to one of the plurality of electrodes to output to the outside is further included, at least one electrode which is disposed at the high temperature side and the plurality of p type and n type thermoelectric elements are bonded with an intermediate layer therebetween. The plurality of p type and n type thermoelectric elements contain silicon as a component and the intermediate layer is formed as a layer containing aluminum and silicon and components other than silicon of the thermoelectric elements.

The invention provides high-silicon heat-resistant vermicular graphite cast iron with thermal fatigue resistance and high performance and a preparation method of thereof, and belongs to the technicalfield of alloy preparation. The vermicular graphite cast iron comprises the following components of, in percent by mass, 2.50%-3.50% of C, 4.50%-5.50% of Si, less than or equal to 0.30% of Mn, less than or equal to 0.050% of P, less than or equal to 0.020% of S, 0.60%-0.90% of Mo, 0.50%-0.9% of Ni, 0.40%-0.80% of Cr, 0.30%-0.60% of V, 0.20%-0.40% of Nb, less than or equal to 0.20% of Cu, 0.10%-0.20% of Ti, 0.010%-0.020% of Mg, less than or equal to 0.05% of RE, less than or equal to 0.05% of Al, and the balance iron. According to the high-silicon heat-resistant vermicular graphite cast iron with the thermal fatigue resistance and the high performance, various alloy elements are optimally compounded and matched for use, so that the vermicular graphite cast iron has excellent thermal fatigueresistance and high-temperature strength and has good dimensional stability and good heat-conducting capacity at high temperature, and the vermicular graphite cast iron can be used for a CNG vehicleengine turbocharger turbine shell and exhaust pipe. Meanwhile, the vermicular graphite cast iron meeting the requirement of being applied to the CNG vehicle engine is obtained through the preparationmethod of the vermicular graphite cast iron.

The invention relates to a microalloying gray cast iron clutch pressure plate material and a preparation method thereof. The microalloying gray cast iron clutch pressure plate material is composed of, by mass, 3.5%-3.9% of C, 2.2%-2.7% of Si, 0.4%-1.5% of Mn, 0-0.1% of P, 0.06%-0.10% of S, 0.2 %-0.4% of Cr, 0.4%-0.7% of Cu, 0.1%-0.4% of V and the balance Fe. The preparation method comprises the step of compound inoculation treatment of silicon barium and silicon iron. The microalloying gray cast iron clutch pressure plate material is high in toughness, good in heat resistance and excellent in casting performance, and a clutch pressure plate produced through gray cast iron which replaces universally adopted gray cast iron at present meet the development requirements of clutches and even engines in the direction of high efficiency, energy saving and emission reduction and has good application prospects.

The invention discloses an aluminum alloy extrusion asymmetric porous mould. The aluminum alloy extrusion asymmetric porous mould comprises an upper mould, a lower mould and a mould cushion, wherein the upper mould, the lower mould and the mould cushion are assembled with one another through bolts, and the mould cushion is provided with a discharging hole which corresponds to the mould hole. The aluminum alloy extrusion asymmetric porous mould is characterized in that the upper mould is provided with a flow dividing bridge and flow dividing holes, one end of the flow dividing bridge is provided with a mould core and extends into the lower mould, the flow dividing holes are distributed at two sides of the flow dividing bridge; the lower mould is sequentially provided with a welding room, a mould hole, a first-stage hollow knife and a second-stage hollow knife from a charging end to a discharging end; the welding room is arranged under the flow dividing holes, and the inner wall of the mould hole is a work belt. The aluminum alloy extrusion asymmetric porous mould can be used for producing the aluminum alloy sectional material which is even in wall thickness, even in flow speed, and more than 85% in comprehensive yield, and the mould has the characteristic of higher stability during production.

The invention discloses an axle bush and an axle sleeve. Both the axle bush and the axle sleeve comprise a matrix and a working surface layer, wherein the working surface layer is made of a cobalt-base alloy, and the cobalt-base alloy comprises the following components in percentage by weight: 10 to 40 percent of Cr, 0.1 to 15 percent of Ni, 0.1 to 15 percent of W, 0.1 to 10 percent of Mo, 0.01 to 5.0 percent of V, 0.01 to 5.0 percent of Ti, 0.01 to 1.5 percent of C, 0.01 to 20 percent of Fe, 0.01 to 5.0 percent of Al, 0.1 to 3.0 percent of Mn, 0.01 to 5.0 percent of Nb, 0.1 to 3.0 percent ofSi, and the balance of Co. The axle bush and the axle sleeve are operated under the conditions of hot-dip aluminum-zinc liquid, hot-dip zinc liquid, hot-dip zinc aluminum, hot-dip pure aluminum liquid and the like, and have good heat-resistant fatigue properties such as good durability, enough strength and elongation, low thermal expansion coefficient, low elastic modulus and the like so as to improve the service properties and prolong the service life.

The invention relates to the technical field of new material processing and discloses a method for improving the performance of alloy cast iron for an automobile mold. Through the research on the alloy cast iron mold steel structure and material service performance, the low fatigue resistance of the alloy cast iron is solved from internal factors. The comprehensive performance of the mold materialis improved. After the alloy cast iron is smelted into molten iron and poured into a ladle in which the modified silica ceramic powder is placed in advanced, spheroidizing and inoculating are performed. After the reaction is completed, the slag removal purification is performed, and then the pouring forming is performed. In the preparation process of the modified silica ceramic powder, europium oxide and zirconium acetate are used as raw materials, and a rod-shaped nano europium oxide / zirconium oxide composite material is prepared through the reaction; and the nanostructure can prevent intercrystal grain from aggregating and growing and prevent the crack propagation, the good adhesion is shown, and the fatigue of the alloy structure is improved by forming an oxide mass point on the surface of an alloy, so that the prepared mold material has excellent thermal fatigue resistance.

The invention discloses a plastic metal-ceramic laminated coating die-casting mould. The plastic metal-ceramic laminated coating die-casting mould comprises a mould base and a surface adhesion layer arranged above the mould base, wherein the surface adhesion layer is composed of, sequentially from bottom to top, a high-plasticity metal layer and a heat-resistant ceramic layer; the thickness of thehigh-plasticity metal layer is 1-500 mu m, and the thickness of the heat-resistant ceramic layer is 1-50 mu m. According to the plastic metal-ceramic laminated coating die-casting mould, the surfacehigh-plasticity metal layer is obtained through laser cladding, plasma surface metallurgy or electron beam surface alloying, so that the high-plasticity metal layer and the mould base can be bonded ina metallurgical mode to effectively prolong the service life of the plastic metal-ceramic laminated coating die-casting mould; the heat-resistant ceramic layer is prepared through the method of plasma spraying, chemical vapor deposition or physical vapor deposition; by means of the obtained surface high-plasticity metal layer and the obtained heat-resistant ceramic layer, the plastic metal-ceramic laminated coating die-casting mould is excellent in anti-deformation property, heat resistance, fatigue resistance, corrosion resistance and wearing resistance.

The invention relates to the technical field of gasifier burner protection, and discloses a gasifier burner protection assembly. The gasifier burner protection assembly comprises at least one protection ring sequentially welded to each other at the ring surface, and a protection cover welded to the ring surface of the protection ring at one side, the external diameter of every protection ring is same to the external diameter of a burner tube, the external diameter of one end, away from the end welded to the protection ring, of the protection cover is same to the external diameter of the outernozzle of a burner head, and the protection cover is made of a nickel-based alloy. The gasifier burner protection assembly is directly made of the nickel-based alloy, so the gasifier burner protectionassembly has good corrosion resistance and good high temperature oxidation resistance, and especially has excellent corrosion resistance, excellent thermal fatigue resistance and excellent high temperature impact resistance at a high temperatures, so the service life of the burner is prolonged; additionally, in the welding process, the welding current is controlled at 120-150 A, the arc voltage is controlled at 13-18 V, and the welding speed is controlled at 7-14 cm / min; and when welding is performed, the interlayer temperature is controlled at 58-76 DEG C, so welding hot cracks and deformation phenomena are prevented in a limited manner.

The invention discloses steel for an economical MPM continuous-rolled core rod. The steel comprises, by weight, 0.35%-0.45% of C, 0.8%-1.2% of Si, 0.8%-1% of Mn, 4.8%-5.5% of Cr, 0.3%-0.5% of Mo, 0.1%-0.2% of Ti, 0.02%-0.08% of Nb, 0.002-0.004% of B, 0-0.03% of P, 0-0.02% of S, and the balance Fe and impurities. A manufacturing method of the steel comprises the steps that an electrode rod is smelted; the electrode rod is subjected to electroslag remelting to obtain an electroslag ingot; and the electroslag ingot is heated and forged into a forged blank. According to the steel for the economical MPM continuous-rolled core rod and the manufacturing method thereof, the chemical component proportion of the steel is more economical and cheaper, the Mo content and the V content are decreased, and the alloy cost is greatly reduced; and meanwhile, the mechanical properties of the novel steel are reinforced and ensured by increasing the content of the element Mn and the content of the element Si and adding the microalloy elements of the Ti, the Nb and the B.

The invention discloses a high-temperature-resistant combined type sinking roll which comprises a roller, a roll shaft and two connecting shaft sleeves; the connecting shaft sleeves are of stepped structures; flange plates are arranged at the large ends of the connecting shaft sleeves; spigot holes in the two ends of the roller sleeve and are fixedly connected with the flange plates of the connecting shaft sleeves; external threads are formed in the external circumferences of the flange plates of the connecting shaft sleeves; the spigot holes in the two ends of the roller are internal threadedholes; the external threads in the external circumferences of the flange plates of the connecting shaft sleeves are in internal threaded hole connection with the spigot holes in the two ends of the roller; the roll shaft is of an integral structure axially penetrating through inner holes of the two connecting shaft sleeves, and is fixedly connected with the two connecting shaft sleeves; axial through holes communicating with an inner cavity of the roller are uniformly and circumferentially formed in the flange plates of the connecting shaft sleeves; and the axial through holes in the flange plates of the connecting shaft sleeves at the two ends are formed in the circumferential direction of the center axis of the roller in a staggered manner. As a further improvement, the surface of the roller is coated with a metal ceramic coating. The high-temperature-resistant combined type sinking roll is high in structural strength and rigidity, in the application, when zinc liquid flows throughthe inner cavity of the roller, an eddy flow can be formed uniformly, and the high-temperature-resistant combined type sinking roll is high-temperature-resistant and wear-resistant.

The invention discloses ceramic quenched and tempered steel and a preparation method thereof. The ceramic quenched and tempered steel comprises, by weight, 70-80% of scrap steel, 2-3% of kaolin, 3-5%of bauxite, 3-8% of quartz sand, 1-3% of mica, 1-2% of bentonite, 1-2% of kyanite, 1-2% of barite, 1-2% of calcite, 1-2% of graphite, 1-2% of fluorite, 1-2% of feldspar, 1-2% of mullite, 0.5-1.5% of SiC, 1-2% of zeolite, 1-3% of wollastonite, 1-2% of spinel, 1-2% of crystal, and 1-2% of aluminum magnesium ore. The ceramic high-strength structural steel is prepared by replacing Fe and C main systemmaterials in existing steel with Fe and Si main system nonmetal ceramic materials, and the ceramic high-strength structural steel has good toughness, excellent welding performance, cold forming performance, low cold brittle transition temperature and good corrosion resistance.