120results about How to "High temperature strength" patented technology

The invention belongs to the technical field of aviation static disc materials, and aims to solve the problem that the application of an existing copper-based static disc material in an aviation brake system is limited due to the fact that the comprehensive performance of the existing copper-based static disc material is weak. In order to achieve the purpose, the invention provides the aviation copper-based static disc material and the preparation method thereof. The aviation copper-based static disc material comprises, by mass, 55%-65% of high-purity electrolytic copper, 10%-15% of aluminum bronze alloy, 4%-8% of nano nickel powder, 2%-5% of chromium molybdenum alloy, 2%-6% of nano silicon carbide particles, 1.5%-4% of continuous carbon fiber bundles, 1%-3% of hexagonal boron nitride nanosheets, 0.5%-2% of tungsten carbide particles, 0.5%-2% of multilayer graphene, 0.3%-1.5% of sodium molybdate, 0.5%-1.5% of a coupling agent, 0.2%-1% of a nano lubricant and 0.1%-0.8% of an antioxidant. The comprehensive properties such as strength, hardness, high-temperature wear resistance, friction coefficient stability and corrosion resistance of the aviation copper-based static disc material are remarkably improved, the requirements of an aviation brake system are met, and the aviation copper-based static disc material is particularly suitable for being applied under complex working conditions.

The invention relates to the technical field of ceramic powder metallurgy, and discloses raw materials for in-situ generation of a core-shell structure ceramic core and a preparation method.The raw materials of the ceramic core comprise refractory material powder, zirconium silicate powder, fused corundum powder and nanometer aluminum oxide powder; the preparation method comprises the following steps: mixing refractory material powder, zirconium silicate powder, fused corundum powder and nano alumina powder in percentage by weight to form a ceramic core raw material, adding the ceramic core raw material into liquid paraffin to form ceramic core slurry, and obtaining a ceramic core biscuit by utilizing the ceramic core slurry through a hot-pressing injection molding method; and the ceramic core biscuit is subjected to powder burying sintering to obtain the ceramic core. Through the synergistic effect of the nanometer aluminum oxide powder, the fused corundum powder and the silicon oxide powder, a core-shell structure with aluminum oxide as a core and mullite fibers as a shell is generated in situ in the sintering process, the bonding strength of the fibers and raw material particles is enhanced, the effective retarding effect on cracks when the ceramic mold core is stressed is achieved, and the ceramic mold core has the good anti-cracking effect. The performance of the ceramic core is further enhanced.

The present invention relates to a "plum blossom pile" type air-permeable brick for composite ladle and a preparation method thereof, wherein the air-permeable brick comprises a dispersion block, a castable, a cover plate, an air chamber, a steel shell, and a slit, wherein the dispersion blocks are evenly and spacedly arranged from the center to the outer circle, the castable is filled between the dispersion blocks, the slits are evenly distributed in the castable, the steel shell is wrapped at the outermost part of the air-permeable brick, the cover plate is at the bottom of the air-permeable brick, and an air chamber is left between the dispersion block, the castable and the cover plate. The air-permeable brick produced by the present invention has good air flow stability and uniformity, large gas ventilation volume, high-strength brick body, good anti-permeability and thermal vibration stability, and a long service life.

The invention discloses a tundish cover castable, and relates to the technical field of tundish refractory materials. The tundish cover castable is prepared from the following raw material components in percentage by mass: 7.8 to 9.6 percent of alumina of 8 to 5mm, 2.6 to 4.3 percent of alumina of 5 to 3mm, 2.6 to 4.3 percent of alumina of 1 to 0mm, 17.4 to 20.8 percent of alumina of 200 meshes, 9.6 to 13 percent of mullite of 5 to 3mm, 22.6 to 26 percent of mullite of 3 to 1mm, 9.6 to 13 percent of mullite of 1 to 0mm, 7 to 8.7 percent of mullite of 200 meshes, 2.6 to 3.5 percent of composite binding agent, 0.8 to 1.7 percent of aluminum silicate, 0.05 to 0.07 percent of SiC nanowire, 0.2 to 0.3 percent of aluminum titanate and the balance of water. The invention discloses a tundish cover castable which comprises the following components in percentage by weight: 0.4-0.7% of alumina micro powder, 0.08-0.11% of sodium tripolyphosphate, 2.6-3.5% of silica fume, 0.87% of steel fiber and 1.3-1.7% of high-alumina cement. Compared with a traditional process, the tundish cover castable has the advantages that the overall performance of the tundish cover castable is remarkably improved, the breaking strength and compression strength of the castable are effectively enhanced, the service life is remarkably prolonged, and the production cost is reduced. And the production cost is greatly saved, and the economical efficiency and the operation rate of continuous casting operation are improved.

The invention discloses a titanium alloy material cutting tool and a machining method, and the machining method comprises the following steps: proportioning a hard phase WC, a binding phase and an additive according to a ratio, carrying out ball milling, spray drying and compression molding to obtain a tool blank, carrying out segmented sintering treatment, machining and molding to obtain the cutting tool, and then carrying out heat treatment to obtain the titanium alloy material cutting tool. Sequentially carrying out electromagnetic coupling strengthening treatment and surface coating plating treatment to form a TiN layer, a CrAlN layer, a CrAlSiN layer and a CrAlBN layer; the titanium-based alloy powder is added into the binding phase, so that the high-temperature strength, the heat resistance and the lightweight characteristic of the cutting tool can be enhanced; the modified CeO2 can improve the microstructure uniformity, the interface bonding force and the oxidation resistance of the cutter, so that the density and the crack resistance are improved; electromagnetic coupling strengthening treatment and multi-layer coating deposition treatment are carried out on the cutting tool, the hardness, wear resistance, oxidation resistance and high temperature resistance of the surface of the tool can be remarkably improved, and meanwhile coating stripping is effectively prevented.

The invention relates to the technical field of investment casting of hollow castings, in particular to a low-deformation high-strength ceramic core and a preparation method thereof.The low-deformation high-strength ceramic core comprises ceramic core powder, and the ceramic core powder comprises, by mass, 30-85% of high-temperature calcined high-bauxite powder, 10-50% of electric smelting mullite powder and 1-20% of alumina powder. According to the ceramic core and the preparation method thereof disclosed by the invention, the ceramic core prepared by accurately proportioning the high-temperature calcined high-alumina bauxite powder, the electrically-fused mullite powder and the alumina powder and combining the synergistic effect of the toughening agent, the pore forming agent and the plasticizer has relatively low deformation and relatively high high-temperature strength, and can meet the requirements of hollow directional / single-crystal castings and polycrystalline hollow castings which are poured at high temperature.

The present invention belongs to the field of new material design, and the alloy provided is Al‑Cu‑Mg‑Ag‑Si‑Sc‑Mn‑Zr, and its composition range is: Cu is 3.8-4.6wt%, Mg is 0.5-1.0wt%, Ag is 0.5-1.0wt%, Si is 0.3-0.5wt%, Sc is 0.05-0.25wt%, Mn is 0.2-0.5wt%, Zr is 0.05-0.15wt%, and the balance is Al element. The basic preparation method of the alloy provided by the present invention is: vacuum induction melting → iron mold casting → homogenization treatment → hot rolling deformation → solution aging. After all the process treatments, the alloy provided by the present invention has high yield strength and tensile strength at room temperature and 210°C, and has high durability at 210°C.

The invention discloses a preparation method of a microalloyed high-temperature-resistant aluminum alloy. The high-temperature-resistant aluminum alloy is prepared from the following components in percentage by mass: 4.7 percent to 5.04 percent of Cu, 0.98 percent to 1.08 percent of Fe, 1.45 percent to 1.6 percent of Ni, 0.51 percent to 0.56 percent of Mn, 0.45 percent to 0.55 percent of Mg, 0.18 percent to 0.2 percent of Ti, 0.2 percent to 0.32 percent of Ce, 0.05 percent to 0.3 percent of Zr, impurities and the balance of Al. By adding Mn, an Al20Cu3Mn2 precipitated phase with high thermal stability can be formed, and Mn is gathered around a theta'phase to inhibit coarsening of the theta 'phase, so that the high-temperature strength and the alloy performance of the aluminum alloy are improved. Fe and Ni are added, so that a stable iron-rich phase Al9FeNi is formed, and the thermal stability and the high-temperature strength of the alloy are also favorably improved. Ti is attached to the periphery of a theta'precipitated phase and hinders coarsening of the theta 'precipitated phase, grains are refined, and the high-temperature strength of the aluminum alloy is cooperatively improved. Ce can form an Al-Ce-M (M = Fe, Ti) intermetallic compound, and can also synergistically improve the thermal stability of the aluminum alloy. In addition, by adding the compounded refining agent, the degassing and impurity removal efficiency can be improved, and after deep purification, the high-temperature-resistant strength of the aluminum alloy is promoted. And the effect of improving the high-temperature strength of the alloy is integrally achieved.

The invention discloses a hydrogen engine powder metallurgy valve seat ring and a preparation method thereof, and belongs to the technical field of powder metallurgy manufacturing, the valve seat ring is composed of a Fe-based alloy matrix and a working face magnetron sputtering plating layer, and the valve seat ring is prepared from, by mass, 0.6%-1.2% of C, 4.0%-7.0% of Cr, 0.8%-1.2% of Ti, 0.8%-1.2% of Nb, 2.5%-5.8% of V, 2.0%-4.0% of W, 3.5%-7.0% of Mo, 2.0%-2.5% of Co, 1.5%-2.0% of Mn, 1.0%-2.0% of Al and the balance Fe. 1.0%-1.5% of a solid lubricant and the balance of Fe, and the particle size is 100-120 meshes. The hydrogen engine powder metallurgy valve seat ring has the advantages that the hydrogen engine powder metallurgy valve seat ring is prepared through the warm pressing-die wall lubrication technology and the like, has excellent hardness and strength, high compactness, corrosion resistance, high abrasion resistance, high-temperature performance, hydrogen embrittlement resistance and hydrogen corrosion resistance and is suitable for hydrogen engines of automobiles, ships, military heavy equipment and the like.

The invention relates to a gradient heterogeneous structure for improving the high-temperature oxidation resistance of an alloy, a preparation method of the gradient heterogeneous structure and the alloy. The gradient heterogeneous structure comprises an alloy structure extending from the surface of the alloy to the interior. In the gradient heterogeneous structure, the grain size is in gradient distribution inwards from the surface of the alloy; in the gradient heterogeneous structure, crystal grains in the same depth range are distributed in multiple sizes, namely, the crystal grains are heterogeneous; annealing twin boundaries exist in the crystal grains; and a precipitated phase exists in the crystal grains or along the crystal boundary. The gradient heterogeneous structures provided by the invention are in gradient distribution in the depth direction macroscopically, grain heterogeneous structures with large grain size difference are locally formed in the same depth range, annealing twin boundaries and precipitated phases are formed in grains, and the high-temperature oxidation resistance of the alloy can be improved while the high-temperature strength of the alloy can be improved.

The invention provides an aluminum-copper-cerium heat-resistant aluminum alloy and a preparation method thereof. The aluminum-copper-cerium heat-resistant aluminum alloy comprises the following components in percentage by weight: 7%-9.5% of Cu, 1.3%-2.3% of Ce, 0.1%-0.5% of Mn, 0.1%-0.4% of Sc, 0.1%-0.4% of Zr and the balance of Al and inevitable impurities. The structure morphology of the heat-resistant aluminum alloy is an isometric crystal, coarse precipitation Al3 (Sc, Zr) exists in the isometric crystal, and the heat-resistant aluminum alloy is an alpha-Al nucleating agent; a large number of high-thermal-stability L12Al3 (Sc, Zr) with the size smaller than or equal to 10 nm and a large number of Al2Cu nanoscale dispersed precipitated phases with the thickness smaller than or equal to 10 nm are separated out in crystal grains, and granular and lamellar Al24MnCu8Ce3, Al16Cu4Mn2Ce and Al8CeCu4 micron-scale heat-resistant intermetallic compound networks are continuously distributed along the crystal boundary. The heat-resistant aluminum alloy is excellent in high-temperature performance and high in high-temperature yield strength and tensile strength and is superior to a traditional ZL206 alloy (T6) and a traditional ZL207 alloy (T6), and the long-term service capacity of the cast heat-resistant aluminum alloy at the high temperature is remarkably improved.

The invention relates to the technical field of withdrawal and straightening roller repairing, in particular to a continuous casting machine withdrawal and straightening roller surface repairing method and alloy powder. According to the repairing method provided by the invention, the roller surface of the pulling-straightening roller is firstly pretreated, and then the pretreated roller surface of the pulling-straightening roller is repaired by adopting laser cladding. Alloy powder is used during laser cladding, so that the high-temperature resistance, wear resistance, high-temperature creep resistance and other properties of a cladding layer are improved, and the service life of the withdrawal and straightening roller is prolonged. The invention further provides alloy powder which is high-carbon iron-based alloy powder containing tungsten, titanium, molybdenum, niobium, silicon, boron and rare earth elements, the alloy powder is used for repairing the roller surface of the withdrawal and straightening roller, and a formed cladding layer has excellent high-temperature resistance. The alloy powder is cladded on the roller surface of the withdrawal and straightening roller by adopting a laser cladding technology to form a functional layer, so that the online steel passing amount and the service life of the withdrawal and straightening roller are remarkably improved.

The present invention discloses a composite coating for improving the surface performance of a carbon-based electrode, a graphite electrode and a preparation method. The composite coating of the present invention comprises a first transition layer, a second transition layer and a protective layer, the thickness of the composite coating is 15 to 35 μm, the first transition layer is a Ta layer with a thickness of 3 to 4 μm, and the second transition layer is a Ta layer with a thickness of 2 to 6 μm. x C layer, the protective layer is a TaC layer with a thickness of 10 to 20 μm, the Ta x The C layer is composed of Ta2C and TaC, wherein x is Ta in Ta x The molar ratio of elements in the C layer. The interface structure components of each layer of the composite coating prepared by the present invention change gradually. The outermost TaC layer has high purity, controllable thickness and good conductivity, and is the main protective layer; the Ta-Ta x The C two-layer transition structure has a high melting point and stable properties. It further enhances the membrane-substrate bonding strength while providing good protection for the internal graphite electrode, thereby greatly improving the bonding strength, anti-ablation and anti-oxidation properties of the entire coating.

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 an Al2O3-SiC-MgAl2O4-C castable prepared from waste magnesia carbon materials and a preparation method of the Al2O3-SiC-MgAl2O4-C castable, and belongs to the technical field of unshaped refractory materials, the Al2O3-SiC-MgAl2O4-C castable is prepared from white corundum aggregate, silicon carbide, waste magnesia carbon bricks, spherical asphalt, alpha-Al2O3 fine powder, silicon oxide fine powder, monatomic silicon powder and calcium aluminate cement as raw materials, and a water reducing agent and water are added; the preparation method comprises the following steps: mixing the materials in a stirrer, stirring, pouring and molding, curing at room temperature, demolding, drying for 36-50 hours, carrying out heat treatment at 1550-1650 DEG C in a carbon-buried atmosphere, and keeping the temperature for 3-5 hours to obtain the refractory castable for the iron runner by using the waste magnesia carbon bricks. The prepared refractory castable is excellent in high-temperature performance and high in oxidation resistance, the service life is obviously prolonged, and meanwhile resource recycling is enhanced.

The utility model discloses a gear ring forge piece which comprises a tooth root and a tooth part, the tooth root and the tooth part are both made of alloy steel, the thickness of the tooth part is 8 mm, the thickness of the tooth root is 5 mm, guide grooves are formed in the tooth root and the tooth part, the surface of the tooth part is covered with an adaptive coating, and the end face of the tooth root and the contact face of a shaft are polished to be smooth and covered with a molybdenum disulfide coating. And a sealing ring is arranged at the joint of the tooth root and the tooth part. According to the gear ring forge piece, the guide groove is formed, so that the gear ring is convenient to mount and dismount, and the mounting efficiency is improved; the low-expansion high-temperature alloy steel is selected and coated with the adaptive coating, so that better corrosion resistance is achieved, and the high-temperature strength and stability are improved; by arranging the sealing ring, the sealing and protection measures of the tooth part and the tooth root are added, so that the influence of corrosive gas or liquid on the material performance is prevented; a plurality of stress release grooves and micropores are formed in the surface of the tooth root, and induction quenching is carried out, so that the internal structure is optimized, stress concentration is reduced, and the overall strength and durability are improved.

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 present invention discloses a high thermal shock MgO-Al-C skateboard brick and a preparation method thereof. In terms of weight percentage, the raw material composition is: 55-65% magnesia particles, 20-35% magnesia fine powder, 5-10% metal aluminum, 1-8% light zirconia particles, 1-3% carbon-containing raw materials, 0.5-5% additives, and 3-5% binders. Each component is weighed by weight, and after mixing, molding, baking, or continuing to be treated at medium temperature in a weak reducing atmosphere or nitrogen atmosphere, it is put into storage after being hooped, glued to a steel shell, ground, coated, finished, and accepted. The high thermal shock MgO-Al-C skateboard brick produced by the present invention is added with light zirconia particles with micropores and compressibility, which absorbs the thermal expansion of magnesia, relieves the thermal stress of the material, and improves the thermal shock resistance. At high temperature, the zirconia particles and periclase are solid-dissolved, which promotes the combination of materials, increases the high temperature strength, reduces the degree of cracking, peeling, and roughening during use, and improves the service life of the MgO-Al-C skateboard.

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.

The application belongs to the technical field of metal matrix composite material preparation, and discloses a preparation method of an intracrystalline dispersed TiC and grain boundary network AlN particle configuration reinforced aluminum matrix composite material, which comprises four steps: firstly, a core-shell powder is prepared by depositing an AlN precursor on the surface of aluminum powder; a core double-shell composite powder is obtained by modifying TiC electrostatic adsorption; a low-temperature pulse pre-pressing protective surface film is prepared; and a multi-stage pulse sintering is performed to induce local micro-melting of the matrix, and the composite material with intracrystalline dispersed TiC and grain boundary enriched AlN is obtained by relying on solid-liquid interface separation. The method forms an AlN grain boundary network and TiC intracrystalline dispersion double-mode configuration through process control, the three-dimensional quasi-continuous AlN at the grain boundary can strongly pin the grain boundary and inhibit the grain growth, and the high-temperature strength and creep resistance of the material are greatly improved, the uniformly distributed nanometer TiC in the crystal can hinder the dislocation movement by the Orowan dislocation bypass mechanism, the room temperature strength and toughness are improved, and the two kinds of strengthening mechanisms work together to meet the use needs.

The invention relates to the field of metal processing, and provides a horizontal continuous casting production process of a large rotor winding double-hole copper bar, which remarkably improves the product quality and the production efficiency through innovative design and optimization. The process mainly comprises the steps of raw material preparation, smelting, heat preservation, horizontal continuous casting, casting blank forming, cold rolling, drawing, aftertreatment, quality inspection and the like. Wherein in the raw material preparation stage, the material performance is optimized by accurately controlling the proportion of alloy elements, for example, 0.03%-0.1% of silver, 0.02%-0.05% of magnesium, 0.03%-0.08% of zirconium and 0.02%-0.06% of chromium are added. And the uniformity is ensured by adopting a double-frequency induction technology for smelting. The innovation of the horizontal continuous casting link is particularly prominent, the crystallizer body made of high-heat-conductivity-coefficient copper alloy is matched with the high-purity isostatic pressing graphite double-hole mold, and accurate segmented cooling control is achieved. The most characteristic is that the middle cooling structure effectively solves the problem of non-uniform cooling in the solidification process of the double-hole copper bar by forming a spraying outlet in the rear half section of the mold rod and adopting a high-frequency pulse spraying technology.

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 the technical field of precision casting, in particular to a ceramic shell and a preparation method and application thereof. The preparation method of the ceramic shell comprises the following steps: (a) coating a fired mold module with surface layer slurry, spraying sand, and drying to form a surface layer; (b) carrying out N times of back layer slurry coating, sand spraying and drying treatment on the surface layer to form a back layer; sealing slurry to obtain a wet blank; n > = 2; (c) dewaxing and roasting the wet blank; the surface layer slurry comprises a first binder, low-sodium fused white corundum powder, active alpha-Al2O3 micro powder and a first reinforcing agent; the back layer slurry comprises a second binder, low-sodium fused white corundum powder, calcined zircon powder and a second reinforcing agent; the first reinforcing agent and the second reinforcing agent comprise polyvinyl alcohol, polyacrylamide and water. The ceramic shell has chemical stability, high-temperature strength, high heat dissipation performance, high-temperature air permeability and the like, and can meet the production requirements of single-crystal high-temperature alloy turbine blades.

The invention relates to the technical field of magnesium alloys, and provides an LPSO and dual-scale particle synergistically enhanced Mg-Gd series heat-resistant alloy and a preparation method thereof. The Mg-Gd series heat-resistant alloy provided by the invention is prepared from the following components in percentage by weight: 8.0 to 10.0 percent of Gd, 0.3 to 0.9 percent of TiB2, 2.74 to 8.21 percent of Al2Gd, 0.4 to 1.0 percent of Zn and the balance of Mg. By introducing the LPSO phase and the double-scale particles (Al2Gd micron particles and TiB2 nano particles), the room-temperature strength and the high-temperature strength of the Mg-Gd alloy are remarkably improved, particularly the high-temperature yield strength and the high-temperature tensile strength at the temperature of 200-300 DEG C are improved, the application range of the magnesium alloy is widened, and the magnesium alloy can be used in key parts in the fields of aerospace and national defense. Moreover, the preparation method provided by the invention is simple to operate and easy to popularize, and has a good application prospect.

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 invention relates to an aluminum alloy material, a preparation method thereof and an aluminum alloy product. The aluminum alloy material comprises, by mass, 4%-8% of Zn, 1%-4% of Mg, 1%-3% of Cu, 3%-12% of nanoparticles and the balance Al. The nano-particles are oxide particles with graphene layers on the surfaces. Wherein the graphene layer on the surface of the oxide particles can effectively reduce the surface energy of the oxide particles, so that the oxide particles are effectively promoted to be uniformly dispersed in an aluminum matrix, and the grain boundary interaction among the oxide particles can be effectively weakened, so that the aggregation of the oxide particles is effectively avoided; and therefore, the room-temperature strength and the high-temperature strength of the aluminum alloy material are effectively improved.