19results about How to "High temperature strength" patented technology

The application discloses a preparation method of a large-bore air-cooled diesel engine piston and specifically comprises the following steps: S1, modeling and dividing regions; S2, gradient printing; and S3, coating addition; and relates to the technical field of diesel engine pistons. The preparation method of the large-bore air-cooled diesel engine piston realizes the synergistic optimization of the overall performance of the piston through gradient printing of the piston, realizes the lightweight of the piston in cooperation with the honeycomb lattice structure, reduces the abrasion amount by using silicon carbide, improves the wear resistance of the top region, forms zirconium tri-aluminum nano precipitated phases by zirconium, refines the grains, forms a composite precipitated phase by using scandium, zirconium and aluminum, improves the high-temperature strength, constructs an efficient heat conduction network by using graphene nanosheets, improves the heat conductivity of the middle region, forms a three-dimensional network by using carbon nanotubes, improves the toughness of the skirt region, and has high interfacial bonding strength by spraying a wear-resistant and corrosion-resistant coating on the surface of the piston, reduces the friction, improves the service life of the piston and effectively reduces the maintenance cost.

This invention relates to the field of metallic materials and hot working technology. The invention discloses a high-temperature resistant, low-activation steel and its preparation method. The chemical composition of the raw materials is as follows (by mass percentage): Cr: 8.0–10.0%, W: 1.0–2.0%, V: 0.2–0.5%, Ta: 0.05–0.2%, Y: 0.005–0.02%, Ce: 0.001–0.005%, B: 0.001–0.005%, C: 0.08–0.16%, N: 0.015–0.035%, Mn: 0.3–0.8%, with the balance being Fe. The steel matrix is ​​tempered martensite, with the original austenite grains having an equivalent size of less than 10 μm, and containing dispersed MX-type carbides (nitrides) and M... 23 C6 type carbides. The preparation process involves vacuum induction melting, homogenization and forging, multi-cycle thermomechanical treatment (TMT), and tempering. This significantly refines the austenite grains and martensite substructure, thereby enhancing the synergistic effect of strength and toughness. The material achieves excellent tensile strength at 650 °C while maintaining an impact absorption energy greater than 150 J at room temperature and -20 °C, making it suitable for use in nuclear fusion reactor core structural materials.

This invention provides a high-strength, high-toughness, and high-thermal-stability nanoparticle-reinforced AZ91 magnesium alloy and its preparation method. The preparation method includes the following steps: mixing niobium-titanium-aluminum alloy powder, BN powder, and C powder, then sealing the mixture in an aluminum tube to obtain an aluminum-powder composite tube blank containing powder particles; then subjecting the composite tube blank to cold drawing and alternating heat treatment, melting, mixing with molten pure aluminum, and twin-roll casting to obtain an intermediate alloy wire containing nano-ceramic particles; mixing the preheated intermediate alloy wire with molten magnesium alloy, followed by mechanical stirring, ultrasonic dispersion, refining and degassing, and cleaning. A high-strength, high-toughness, and high-thermal-stability nanoparticle-reinforced AZ91 magnesium alloy is obtained by slag removal, casting, homogenization treatment, air cooling, extrusion molding, and annealing. The magnesium alloy has a room temperature yield strength of 178.7-290.2 MPa, a tensile strength of 238.9-389.1 MPa, and a fracture strain of 12.4-14.6%. After serving at 150-180℃ for 30-100 hours, the yield strength is 120.3-151.8 MPa, the tensile strength is 158.1-203.6 MPa, and the fracture strain is 38.7-61.9%.

The invention discloses high-purity heat-resistant quartz ceramic and a preparation method and application thereof, and belongs to the technical field of inorganic non-metallic materials, the high-purity heat-resistant quartz ceramic comprises the following raw materials by mass fraction: 50-80% of a fused high-purity quartz raw material, 10-50% of fused high-purity quartz fine powder, 0.1-1% of a composite mineralizer, and 0.1-5% of a binder; the content of CaO in the high-purity heat-resistant quartz ceramic is less than or equal to 0.1%. The aspects of raw material deep processing, additives, the preparation process and the like are strictly controlled, the addition of calcium-containing substances is avoided, the eutectic point phase is fundamentally reduced, the alkali corrosion resistance and the high-temperature strength are further improved, and the finally obtained quartz ceramic has the advantages of high refractoriness under load, excellent thermal shock resistance and corrosion resistance, and the service life of the quartz ceramic is prolonged. The method is suitable for severe environments such as oxy-fuel combustion glass kilns.

The utility model discloses hollow porous tunnel kiln burner brick relates to tunnel kiln technical field. The utility model discloses a brick body, the inside of brick body is provided with the combustion port, the inside of brick body is provided with the air vent, the inside of brick body is provided with the pre -tightening subassembly, the pre -tightening subassembly includes the pre -buried rod of installation in the inside of brick body, installs the tension rod on the surface of pre -buried rod, installs the reinforcing rib on the surface of pre -buried rod and installs the screw rod on the one end of pre -buried rod, the inside installation of combustion port has the protection layer. Hollow porous tunnel kiln burner brick of the utility model through the unique structure design, has improved its overall performance and service life significantly, and the introduction of pre -tightening subassembly has effectively enhanced the structural strength of brick body, and the synergies of pre -buried rod, tension rod and reinforcing rib, not only have improved the compression and the bending -resistant ability of brick body, still effectively restrained the expansion and the shrinkage of brick body, prevented the generation of crack.

The present application belongs to the technical field of preparation of multi-curved surface silicon carbide, and discloses a preparation method of reaction sintering multi-curved surface silicon carbide whole plate, comprising: mixing 100 parts of alpha-SiC powder, 15-20 parts of composite carbon source, 1-2 parts of silicon carbide fiber, 2.3-3.8 parts of dispersing agent, 8-12 parts of water-soluble phenolic resin, 2-4 parts of additive and 42-46 parts of water according to weight parts, pre-dispersing, ball-milling, spray granulating, pressing into multi-curved surface green body; the green body is stacked with graphite support parts and filled with graded silicon particles, and is subjected to step-by-step degreasing and step-by-step reaction sintering under vacuum argon, and then is cooled after temperature control to obtain the product. Through the synergistic effect of formula control of composite carbon source, specific ternary additive and fine sintering process, the technical problem of sintering cracking and cracking of multi-curved surface whole plate is eliminated, and the product density, bending strength and fracture toughness are effectively improved.

This invention relates to a high thermal conductivity rare-earth copper-chromium alloy and its preparation method, belonging to the field of alloy material technology. The chemical composition of the copper-chromium alloy includes: 0.5-1.0 wt% Cr, 0.01-0.05 wt% Zr, 0.005-0.015 wt% Ce, no more than 0.005 wt% unavoidable impurity elements, and the balance being Cu. By adding trace amounts of cerium and zirconium to the copper-chromium alloy, this invention not only utilizes the grain boundary purifying effect of cerium in the alloy system and reduces the scattering of thermally conductive electrons by solid-solution Cr and Zr atoms, thereby significantly reducing the adverse effects of solid-solution chromium and zirconium atoms on the thermal conductivity of copper, but also utilizes the synergistic effect of zirconium and chromium to significantly improve the thermal conductivity, stress relaxation resistance, and high-temperature strength of the copper-chromium alloy. The high thermal conductivity rare-earth copper-chromium alloy of this invention has excellent thermal conductivity and high-temperature strength, making it suitable for large-scale application as an electrical contact material.

The invention relates to a high-temperature anti-erosion cast high-zirconium brick and application thereof, and belongs to the technical field of refractory materials. The high-zirconium brick is prepared from the following components in percentage by mass: 96.4 to 97.6 percent of ZrO2, 1.18 to 1.70 percent of SiO2, 0.15 to 0.80 percent of Al2O3, 0.04 to 0.08 percent of Na2O, 0.02 to 0.06 percent of K2O, 0.20 to 0.30 percent of La2O3, 0.20 to 0.30 percent of SnO2 and less than 0.10 percent of other impurities. The method is characterized in that La2Sn2O7 is adopted as a raw material, La2O2 generated through decomposition in the high-temperature casting process serves as a heterogeneous nucleation core refined grain structure, and the high-temperature strength and toughness are improved; meanwhile, SnO2 is decomposed in a reducing atmosphere to release oxygen, bubbles are promoted to merge and escape, the porosity is remarkably reduced, and the density is improved. The data of the embodiment shows that the volume density of the brick body reaches 5.59-5.68 g / cm < 3 >, the porosity is lower than 0.61%, the anti-erosion rate in 1500 DEG C molten glass is as low as 0.28-0.34 mm / 24 h, and the brick shows excellent anti-erosion performance and high-temperature stability and is suitable for severe industrial environments such as a glass kiln.

The invention discloses Ti-based alloy powder, which is prepared from the nominal components in percentage by atom: (5 to 10) of Ti, (2 to 5) of Al, (1 to 3) of V, (0.5 to 2.0) of Y2O3 and the balance of Ti and inevitable impurities, the preparation method comprises the following steps: 1, weighing raw material powder; 2, charging and sealing; 3, ball milling; and 4, discharging to obtain Ti-based alloy powder. According to the Ti-based alloy powder disclosed by the invention, high-volume nano Y2O3 is introduced and uniformly dispersed in a Ti matrix to form a dispersion strengthening phase, so that the room-temperature and high-temperature strength, creep resistance and thermal stability of the alloy are improved; according to the mechanical alloying process, the ball-to-material ratio, the rotating speed and the time of ball milling are strictly controlled, intermittent ball milling and external cooling are adopted to control temperature rise and pollution, it is guaranteed that Y2O3 forms nanocrystalline and a dispersion strengthening phase in a Ti matrix, the strength, hardness and thermal stability of the alloy are improved, the process is controllable, and repeatability is good.

The application provides a double-curing acrylate-epoxy hybrid adhesive as well as a preparation method and application thereof, and belongs to the technical field of adhesives. The double-curing acrylate-epoxy hybrid adhesive is composed of component A and component B. The component A comprises tetrahydrofurfuryl methacrylate, isobornyl methacrylate, hydroxypropyl methacrylate, N,N-dimethylaniline, a toughening agent, a double-curing resin, wollastonite, fumed silica, solid glass microbeads, an antioxidant, a phosphate monomer and a multifunctional monomer. The component B comprises benzoyl peroxide, an epoxy resin, wollastonite and fumed silica. The double-curing acrylate-epoxy hybrid adhesive prepared by the application can realize the combination of high-temperature strength and normal-temperature toughness, and solves the problem of easy gelation of a traditional NCO-containing system.

The invention relates to the field of advanced non-ferrous metal material high-heat-insulation coating protection, in particular to a composite oxide ceramic coating preparation method based on an electrophoretic deposition technology. Firstly, the heat-resistant steel surface is pretreated, and surface oil stains and oxidation impurities are removed; then a nickel-based electroplating solution containing rhenium chloride and ruthenium chloride is prepared, the pretreated heat-resistant steel part is placed in the nickel-based electroplating solution to be subjected to electro-deposition, and a nickel-rhenium-ruthenium composite metal bonding layer is formed on the surface of the nickel-based electroplating solution; then preparing a composite ceramic suspension, taking acetonitrile as a solvent, taking 3, 3-dimethoxypropionic acid as an additive, containing YSZ powder and nano ruthenium dioxide-rhenium oxide mixed powder, and putting the part with the metal bonding layer into the suspension for electrophoretic deposition to form a composite oxide ceramic coating precursor; and then the ceramic coating is placed in a high-temperature furnace protected by inert gas to be sintered, interface fusion of the bonding layer and the ceramic coating and densification of the ceramic coating are achieved, and the ceramic coating has excellent heat insulation performance and strong interface bonding force.

The invention relates to the technical field of electrical contact materials, in particular to a SnO2 electrical contact material for a new energy electrical appliance and a preparation method of the SnO2 electrical contact material. The SnO2 electrical contact material comprises 8-15% of tin oxide, 0.5-3% of a composite additive, 0.1-2% of an accelerant and the balance of silver. According to the invention, yttrium ions and chromium ions can be partially dissolved in tin oxide crystal lattices, so that the thermal decomposition reaction of tin oxide at extremely high arc temperature is effectively inhibited, the material loss caused by tin element volatilization is reduced, the second additive generates a high-melting-point composite oxide phase after high-temperature calcination, and the high-melting-point composite oxide phase is uniformly distributed in a silver matrix; as a physical skeleton for resisting arc erosion, the accelerant mainly plays a role in dispersing and interface optimizing, and an interface compound containing zinc, lanthanum, boron and oxygen is formed after the accelerant is calcined, so that the wettability and binding force between tin oxide particles and a silver matrix are improved, uniform distribution of the tin oxide particles is ensured, local overheating and concentrated erosion are avoided, and the service life of the tin oxide particles is prolonged. Therefore, the mass loss of arc ablation is obviously reduced.

This invention relates to an aluminum-based composite material, a robot arm, and a method for preparing the robot arm, belonging to the technical field of metal matrix composites and high-end equipment structural components. The aluminum-based composite material comprises an aluminum alloy matrix and silicon carbide particle reinforcement distributed within the aluminum alloy matrix. The chemical composition of the aluminum alloy matrix, by mass percentage, includes: Cu 3.0-6.0%, Mg 0.5-2.0%, Ag 0.1-1.0%, Zr 0.05-0.3%, Ti 0.01-0.2%, with the balance being Al and unavoidable impurities. The microstructure of the aluminum alloy matrix contains L12-Al3(Zr,Ti) nanophases and lath-like Al2Cu phases. The robot arm prepared using this aluminum-based composite material exhibits an axial tensile strength exceeding 320 MPa and an axial thermal conductivity exceeding 220 W / (m·K) at a high temperature of 300℃, achieving an integrated function of "load bearing and heat conduction." This invention effectively solves the problems of decreased accuracy and shortened lifespan of existing robot arms due to material softening and insufficient heat conduction at high temperatures, and has the advantages of lightweight, high reliability and low cost.

The present application relates to a kind of preparation methods of net basket organization TC11 titanium alloy blade, comprising the following steps: S1: TC11 titanium alloy ingot is heated to 1100~1150 ℃, after 8h~16h heat preservation, furnace forging, and forging ratio is not less than 4;S2: blank in S1 is 20 ℃~50 ℃ above T beta phase transition point is carried out 2~5 fire times of upsetting and drawing deformation, and total forging ratio is not less than 10;S3: the forging blank in S2 is heated to 10 ℃~30 ℃ above T beta phase transition point, is formed by 2~4 fire times on precision forging machine, S4: the rod prepared by S3 is heated to 10 ℃~30 ℃ above T beta phase transition point, is formed by 1~2 fire times using hammer forging on hammer forging machine;S5: the blade of hammer forging formation of S4 is heat treated and surface processing, obtains net basket organization TC11 titanium alloy blade.The blade surface of the present application is formed gradient type permeation oxygen layer after processing, so that the fatigue property of blade is greatly improved.

The invention discloses a high-strength heat-resistant AlCuMn aluminum alloy material and a heat treatment method thereof. The heat treatment method comprises the steps of alloy component design, solution treatment, low-temperature aging treatment and high-temperature aging treatment. According to the heat treatment method, the high-temperature strength of the Al-Cu-Mn aluminum alloy can be remarkably improved, and the heat treatment process is simple, low in cost and easy to popularize and popularize.

The invention discloses a cooperative control method for the surface quality and the internal quality of a medium-carbon high-Cr steel continuous casting round billet. The cooperative control method is suitable for production of 26Cr3Mo steel with the specification of phi 250-350 mm. According to the method, quality collaborative improvement is achieved through molten steel component fine adjustment, continuous casting process dynamic control, online quality monitoring and precise slow cooling. In the continuous casting process, the superheat degree of a tundish is controlled in a segmented mode according to the condition that the temperature of a first furnace is 26-36 DEG C and the temperature of a continuous furnace is 16-26 DEG C and is dynamically adjusted along with the content of Cr, high-titanium anti-invasion casting powder is adopted, the crystallizer electromagnetic stirring and solidification tail end soft reduction technology is matched, the water volume of primary cooling water is 150-180 m / h, the specific water volume of secondary cooling water is 0.30-0.36 L / kg, and according to the slow cooling process, the pit entering temperature is larger than or equal to 620 DEG C, the slow cooling time is larger than or equal to 78 h, and the pit exiting temperature is smaller than or equal to 260 DEG C. According to the method, the surface crack rate of a casting blank is smaller than or equal to 0.1%, the center segregation index is smaller than or equal to 1.1, the inner folding rate of a rolled tube is smaller than or equal to 0.2%, and the percent of pass reaches 99.9%

The present application relates to lost foam casting paint technical field, especially to a kind of casting pipe fittings lost foam paint and quantitative design method.The lost foam paint includes the following components according to weight fraction: composite aggregate 78-88 parts, mullite micro powder 6-9 parts, flaky graphite 3-5 parts, boron nitride micro powder 0.6-3 parts, composite reinforcing fiber 0.3-0.6 parts, suspending agent 1.5-2.5 parts, chelating dispersant 0.15-0.35 parts, binder 0.9-1.3 parts, fluxing agent 2.5-4.5 parts, defoaming agent 0.05-0.15 parts, wetting agent 0.03-0.08 parts;Composite aggregate includes quartz powder 57-70 parts, calcined bauxite 18-25 parts;Composite reinforcing fiber is composed of inorganic short fibers and organic short fibers according to mass ratio (4-6):1.The present application realizes accurate stress adaptation of coating and pipe fittings by "global thermal expansion adaptation, local fiber reinforcement, gradient ceramic strengthening" triple anti-cracking strategy.

This invention provides a method for preparing a nickel-based superalloy, relating to the field of superalloy material preparation and heat treatment technology, comprising the following steps: sequentially subjecting a nickel-based superalloy ingot to electroslag remelting, homogenization, and forging to obtain the nickel-based superalloy. In this invention, the electroslag remelting process simultaneously precipitates primary M6C carbides and primary SiC carbides. Compared to M6C, SiC is easier to precipitate and dissolve; therefore, after the primary SiC carbides consume some carbon, less primary M6C carbides are formed, thus reducing the difficulty of carbide dissolution. The homogenization process then allows the primary carbides to fully dissolve into the austenitic matrix and eliminates elemental segregation. Finally, the forging process ensures that the secondary M6C carbides reprecipitate from the matrix in a dispersed distribution, preventing the primary carbides from agglomerating in bands along the forging direction due to genetic effects, thereby avoiding damage to the alloy's strength and plasticity.

The invention provides an in-situ synthesis high-strength heat-resistant magnesium-based composite material and a preparation method thereof.The in-situ synthesis high-strength heat-resistant magnesium-based composite material comprises a magnesium alloy matrix and an Al3Ti and Al2Gd particle strengthening phase, and the in-situ synthesis high-strength heat-resistant magnesium-based composite material comprises, by mass, 8%-20% of Gd, 4%-18% of Al, 0.8%-4% of Ti and the balance Mg and inevitable impurities. The specific preparation method of the material comprises the following steps: melting pure Mg in a crucible resistance furnace with atmosphere protection, sequentially adding pure Gd and pure Al, fully melting, mechanically stirring, adding sponge Ti, applying electromagnetic stirring, pouring to obtain a composite material master ingot, and homogenizing and aging to obtain the in-situ synthesis magnesium-based composite material. According to the composite material, Al, Ti and Gd are used for generating high-melting-point Al3Ti and Al2Gd phases, and the high-temperature performance and the elastic modulus of the material are improved; ti is used as a grain refining element, so that the material cost is reduced.