75results about How to "Improve high temperature strength" patented technology

The invention discloses a pure smelting method for nickel-based superalloy, which relates to the technical field of metal smelting and comprises the following steps: (1) screening high-purity raw materials; (2) selecting a vacuum induction melting furnace and carrying out vacuumizing treatment; (3) sequentially adding the pretreated raw materials into a vacuum induction melting furnace, and heating and melting the raw materials; (4) carrying out electromagnetic stirring; (5) preparing special electroslag, and drying and crushing the electroslag; and (6) casting the alloy liquid subjected to vacuum melting into a consumable electrode, inserting the consumable electrode into the slag of the electroslag remelting furnace, and electrifying. According to the design scheme, impurities in the nickel-based superalloy are effectively removed, the purity and uniformity of the alloy are improved, the mechanical property and thermal stability of the alloy are improved, the service life is prolonged, and a better purification effect is achieved.

The invention provides a high-damping titanium alloy with a wide temperature range at a high temperature and a preparation method thereof. The titanium alloy is prepared from the following elements in percentage by mass: 3.4 to 5.2 percent of Al, 2.8 to 4.4 percent of Cr, 2.6 to 4.5 percent of Mo, 0.7 to 1.5 percent of Zr, 0.17 to 0.41 percent of O and the balance of Ti. The preparation method of the alloy comprises the following steps: (1) cast ingot smelting; (2) homogenization treatment; (3) beta forging treatment; (4) near beta forging treatment; (5) rolling treatment; and (6) annealing treatment. The method is reasonable in conception, the functional characteristics of wide temperature range and high damping can be obtained at high temperature, the mechanical properties of high strength and high plasticity are achieved, meanwhile, the preparation difficulty of the material is reduced in combination with a traditional titanium alloy machining method, and the method is suitable for large-scale production, popularization and application.

The invention relates to a three-dimensional network carbide reinforced refractory alloy and a preparation method thereof, and belongs to the technical field of alloy material preparation. The three-dimensional network carbide reinforced refractory alloy is composed of a BCC matrix phase and a large number of dispersed three-dimensional network carbide reinforced phases, and the crystal structure of the carbide is M2C or MC type and is in a complete coherent relationship with the BCC matrix. The method has high adaptability, the applicable refractory alloy material range is wide, particularly fine component design is not needed, the process window is wide, and operation is easy. According to the material prepared by the method, a carbide phase and a matrix are coherent, the bonding strength is high, the stability is good, and repeated thermal cycle can be endured. According to the method, integration of material preparation and component forming can be achieved, high-freedom-degree direct forming of complex three-dimensional parts is directly achieved, and the forming requirement in the actual using process can be met to a great extent.

The invention belongs to the technical field of bio-based polyurethane functional composite materials, and relates to a preparation method and application of a cellulose / polyurethane functional composite material based on a Diels-Alder reaction, the preparation method comprises the following steps: mixing furan functionalized cellulose nanofibers with maleimide-terminated waterborne polyurethane, and carrying out copolymerization through the Diels-Alder reaction to obtain the cellulose / polyurethane functional composite material based on the Diels-Alder reaction. The cellulose / polyurethane functional composite material is prepared. Compared with the prior art, the method has the advantages that a reversible dynamic covalent network is generated through Diels-Alder reaction to endow the material with self-healing and recoverability, so that the material realizes self-healing under temperature fluctuation, the service life is prolonged, the sustainability is improved, and the problem of poor compatibility of biomass components and a polyurethane matrix in a traditional mixing method is solved; the cellulose nanofiber / polyurethane composite material is endowed with good mechanical properties, high-temperature strength and low-temperature toughness.

The invention discloses an alloy wear-resistant sliding block and a preparation and production process, and belongs to the technical field of alloy sliding blocks. A position hole is formed in an upper base body, and position grooves are formed in the periphery of the position hole. The included angle between the position holes and the vertical axis is 17-35 degrees, an L-shaped pressing block is installed on the outer side of the arc-shaped body, and a curve part and a bevel part are arranged in the side direction of the L-shaped pressing block; the end parts of the curve parts are welded on the longitudinal water beam; and an anti-bending strip is arranged in the multiple groups of curve parts and is welded with the L-shaped pressing block. The alloy comprises the following components in parts by weight: 2 to 3 parts of C, 10 to 15 parts of Fe, 3 to 5 parts of S , 2 to 3 parts of Al, 15 to 19 parts of Cr, 3 to 5 parts of T , 0.3 to 1.5 parts of Nb, 6 to 9 parts of Co, 0.1 to 0.2 part of P and the balance of N and trace residual impurities, wherein REC is set to be equal to (A < l > + S + T + Cr) / 3N + (Nb + T ) / 2 (N + Cr), and REC is larger than or equal to 0.16 and smaller than or equal to 0.31. The technical problems that longitudinal expansive force is generated in the heat-resistant sliding block due to heating, cracks are generated on the surface of the longitudinal water beam under the action of tensile force, and then breakage is caused are solved.

The invention discloses ferrite heat-resistant stainless steel and a preparation method thereof. The ferrite heat-resistant stainless steel comprises the following components in percentage by weight: 0.02 to 0.09 percent of C, 0.50 to 1.00 percent of Si, 0.80 to 1.50 percent of Ni, 11.00 to 14.00 percent of Cr, 0.10 to 1.00 percent of Mn, 0.02 to 0.10 percent of Ti, 0.02 to 0.50 percent of Co, 0.03 to 0.10 percent of Al, 0.003 to 0.015 percent of Ca, 0.001 to 0.005 percent of B, less than or equal to 0.04 percent of S, less than or equal to 0.03 percent of P and the balance of Fe and inevitable impurities. According to the invention, the ferritic stainless steel has excellent high-temperature strength, impact resistance and corrosion resistance, and a guarantee is provided for matched upgrading of industries such as automobiles, chemical engineering, industrial boilers and the like.

The invention relates to the technical field of fused alumina zirconia bricks, in particular to a fused alumina zirconia refractory brick and a preparation technology.The fused alumina zirconia refractory brick is prepared from, by weight, 55-65 parts of alumina powder, 25-35 parts of zircon sand, 1-5 parts of modified nanometer alumina powder, 2-6 parts of binder, 1-2 parts of chromic oxide, 1-3 parts of yttrium oxide and 1-4 parts of fluxing agent. Through in-situ growth of a layer of carbon nanotube core-shell structure on the surface of nano-alumina, the core-shell structure can prevent direct contact between nano-alumina particles, so that the possibility of nano-alumina agglomeration is reduced, and nano-alumina is uniformly distributed in the corundum amorphous refractory brick. A finer dispersed phase is formed in the brick body, so that the expansion of cracks is hindered, and the toughness and the strength of the brick body are improved.

The invention relates to the technical field of water-based binders, and discloses a high-heat-resistance water-based binder and a preparation method thereof.The high-heat-resistance water-based binder is prepared from, by mass, 40-60 parts of water-based epoxy resin, 15-20 parts of a high-temperature-resistant additive, 10-15 parts of a thiol-terminated hyperbranched polymer, 1-2 parts of a film-forming agent, 0.5-1 part of a dispersing agent, 1.5-2 parts of a defoaming agent, 3-4.5 parts of a curing agent and 12-30 parts of deionized water. Kaolin in the powdery material can react with sodium silicate and phosphate, an Al-O-Si three-dimensional framework and heat-resistant aluminum phosphate can be formed in the water-based binder, and high high temperature resistance is achieved. A formed Al-O-Si three-dimensional framework and heat-resistant aluminum phosphate are coated on the surface of the graphene, so that the impact resistance of the graphene nanosheet is improved; the thiol-terminated hyperbranched polyester can enlarge the free volume of the water-borne epoxy resin, facilitates molecular chain movement of the epoxy resin and improves the toughness.

The invention relates to a NiTi alloy MIM (metal injection molding) piece preparation method which comprises the following steps: S1, powder preparation: performing ball-milling mechanical mixing on Ni, Ti, Zr and Hf metal powder according to the mass ratio of 58: 38: 2: 2 to obtain mixed powder; the mixed powder is smelted into an ingot, then the ingot is smelted three times in a consumable electrode vacuum furnace, the obtained cast ingot is annealed, the annealed cast ingot is subjected to supersonic gas atomization to form alloy powder, and NiTi alloy powder with the powder particle size D90 smaller than or equal to 20 micrometers is screened out; s2, feed preparation; s3, injection molding; s5, degreasing is conducted; and S6, sintering. Through introduction of Zr and Hf elements, decomposition of a Ni4Ti3 phase can be effectively prevented, and the hardness and fatigue resistance of the NiTi alloy MIM part are effectively improved.

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 mold treatment process for hot top casting of aluminum alloy, and relates to the technical field of alloy material processing. The method is used for treating a mold for aluminum alloy casting through hot top casting and comprises the following steps that the surface of the joint of a graphite ring and an adapter plate of a hot top casting crystallizer is coated with a fire-resistant heat preservation material; the refractory thermal insulation material comprises the following raw materials in parts by weight: 50-80 parts of refractory aggregate, 15-25 parts of an adhesive and 2-5 parts of a suspending agent, the preparation method of the adhesive comprises the following steps: firstly, carrying out carboxylation treatment on the vinyl organic silicon component to obtain a component I; performing epoxy treatment on the component I to obtain a component II; and performing cyclic carbonation on the component II to obtain the adhesive. When the adhesive prepared by the invention is added into a fire-resistant thermal-insulation material, the material is endowed with excellent bonding strength and thermal shock resistance.

The invention discloses a quartz fiber toughened aluminum-carbon refractory material and a preparation method thereof, and belongs to the technical field of aluminum-carbon refractory materials. The refractory material comprises a main material, quartz fibers and a binding agent, the main material comprises the following components in percentage by weight: 65-70% of sintered tabular corundum particles, 10-15% of sintered tabular corundum fine powder, 5-10% of carbon black, 1-3% of boron carbide, 1-6% of activated aluminum oxide and 4-8% of silicon powder; the addition weight of the quartz fiber is 0.1-0.9% of the weight of the main material; the adding weight of the binding agent is 3-5% of the weight of the main material. The preparation method comprises the following steps: heating and uniformly mixing carbon black, boron carbide, activated aluminum oxide, silicon powder, quartz fibers and a part of binding agent in a closed strong stirrer, adding the rest raw materials, mixing, kneading, ageing, mechanically pressing, drying, and carrying out segmented heat preservation and heat treatment in a carbon-buried atmosphere, thereby obtaining the high-strength silicon-carbon composite material. And finally, the aluminum-carbon refractory material with high strength, good toughness, excellent thermal shock resistance and long high-temperature service life is prepared.

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 utility model discloses a cofferdam structure and channel structure for improving the clarification quality of molten glass, which comprises a flow dividing weir arranged on the inner side of a platinum channel and a blocking weir arranged on the inner side of the platinum channel, and the cross section of the flow dividing weir is in a shape similar to a water drop. The water-drop-like shape comprises a first flow-dividing weir edge, a second flow-dividing weir edge, a first flow-dividing weir edge end and a second flow-dividing weir edge end, the first flow-dividing weir edge is a straight line, the second flow-dividing weir edge is arc-shaped, the first flow-dividing weir edge end is semicircular, and the second flow-dividing weir edge end is in arc-shaped transition connection with the second flow-dividing weir edge; the cross section of the blocking weir comprises a first blocking weir edge and a second blocking weir edge, the first blocking weir edge is in a circular arc shape in the space, the blocking weir is of a structure similar to an annular body, the whole blocking weir is bent in the horizontal direction, projections of the upper surface and the lower surface of the blocking weir coincide, and the surface where the second blocking weir edge is located is in arc transition connection with the annular surface where the first blocking weir edge is located. And the annular surface of the retaining weir clings to the inner side surface of the platinum channel. The utility model can solve the problems that the residence time of molten glass is short, and bubbles cannot be discharged in time, so that bubble defects are caused.

The application belongs to the technical field of sand consolidation agent preparation, and particularly relates to a sand consolidation agent and a preparation method thereof. The sand consolidation agent is composed of component A and component B. The component A is composed of the following raw materials: a diphenyl phenolic epoxy resin, hexakis(4-hydroxymethylphenoxy)cyclotriphosphazene, modified nano calcium zirconate, cage octakis(aminophenyl)silsesquioxane, n-butyl glycidyl ether, KH-550 silane coupling agent, polyether amine, fumed silica and defoaming agent. The component B is composed of the following raw materials: polyborosilazane and 2-ethyl-4-methyl imidazole. The cage octakis(aminophenyl)silsesquioxane in the raw material of the sand consolidation agent strengthens the network structure stability through chemical bonding, the hexakis(4-hydroxymethylphenoxy)cyclotriphosphazene realizes thermal stabilization through chemical bonding and physical dispersion, and the modified nano calcium zirconate provides physical support. The three components synergistically improve the heat resistance of the system.

The invention discloses a high-strength corrosion-resistant aluminum alloy material for an aerosol can and a preparation method of the high-strength corrosion-resistant aluminum alloy material, and relates to the technical field of aerosol can materials. 1.2 wt% to 1.5 wt% of N ; the content of Mo is 0.02 to 0.03 percent by weight; 1.2 wt% to 1.6 wt% of S ; 0.6 wt% to 1.2 wt% of Mg; 1.2 wt% to 1.8 wt% of Cu; 0.05 wt% to 0.08 wt% of T ; 0.10 wt% to 0.15 wt% of Cr; re; and the balance of A l; according to the aluminum alloy material, all the components of the aluminum alloy material are greatly adjusted, and a more suitable component dosage ratio is adopted, so that the prepared aluminum alloy material not only has higher strength performance, but also has excellent corrosion resistance, and can be better suitable for being used in aerosol cans.

The invention discloses an Al-Mg-Sc-Zr series aluminum-based composite powder and a preparation method and application thereof. The Al-Mg-Sc-Zr series aluminum-based composite powder consists of an Al-Mg-Sc-Zr series aluminum alloy powder, a Co-Cr-Ni medium-entropy alloy powder and an oxide bait powder; in the Co-Cr-Ni medium-entropy alloy powder, Co, Cr and Ni are in an equal molar ratio; in the Al-Mg-Sc-Zr series aluminum alloy powder, each component and its weight percentage are as follows: 1.0-5.0% of Mg, 0.3-1.0% of Sc, 0.05-0.35% of Zr, 0.05-0.5% of Mn, 0.1-0.2% of Si, 0.01-0.03% of Mo, and the rest is Al. The Al‑Mg‑Sc‑Zr aluminum-based composite material obtained by laser additive forming of the Al‑Mg‑Sc‑Zr aluminum-based composite powder of the present invention not only has high room temperature tensile strength, but also has good high temperature resistance. The tensile strength at 300°C can still reach more than 200 MPa, meeting the current performance requirements of aerospace heat-resistant aluminum alloy components.

The preparation technology comprises the steps that molybdenum dioxide powder, Re powder, Ti powder, C powder and Al powder are subjected to ball milling and mixing to obtain precursor molybdenum-rhenium composite powder, molybdenum-rhenium alloy composite powder is obtained through two-stage hydrogen reduction, then high-temperature large-deformation rotary swaging is conducted after cold isostatic pressing and pressureless sintering are conducted, and the molybdenum-rhenium alloy is obtained. And finally, the high-temperature-resistant molybdenum-rhenium alloy with high-density dislocation is obtained. The dislocation density of an alloy matrix is increased by introducing a secondary phase, the recrystallization temperature of the molybdenum-rhenium alloy is increased, ultrahigh-temperature large-deformation rotary swaging of the molybdenum-rhenium alloy is achieved, high-density dislocation is further introduced through high-temperature large-deformation rotary swaging, the high-temperature tensile strength of the molybdenum-rhenium alloy is improved, and meanwhile the plasticity and toughness of the molybdenum-rhenium alloy are improved; and a wider application prospect is provided for application of the molybdenum-rhenium alloy in a more extreme environment.

The invention relates to an electric arc furnace gunning mix which comprises the following components in parts by weight: 35-55 parts of bauxite, 15-25 parts of silicon carbide (SiC), 10-25 parts of white corundum, 3-8 parts of silicon oxide (SiO2), 2-5 parts of silicon nitride (Si3N4), 0-3 parts of zirconium diboride (ZrB2), 3-8 parts of coke powder, 0-8 parts of a sintering aid and 5-10 parts of a binding agent, and the zirconium diboride is not zero. The method has the beneficial effects that a high-temperature ceramic body containing a ZrB2-SiC multiphase material is generated at a damaged furnace lining part through added zirconium diboride and silicon carbide and coke powder in the zirconium diboride under the action of a sintering aid, and the high-temperature ceramic body has good oxidation resistance, thermal shock resistance and ablation resistance, so that the service life of the electric arc furnace lining can be greatly prolonged.

The invention discloses a high-strength anti-steam oxidation coating material and a coating, a preparation method and application thereof, and belongs to the technical field of corrosion prevention of inner walls of through-flow components of thermal power generating units. The high-strength steam oxidation-resistant coating material disclosed by the invention is composed of the solid-phase component and the liquid-phase component, and all the components play a synergistic role, so that the steam oxidation resistance of a coating is improved, and meanwhile, the mechanical property of the coating is enhanced, so that the coating is prevented from cracking in the service process, and the service life of the coating is prolonged. The problem that an existing coating cracks in a high-temperature environment is solved.

The application relates to the technical field of metal matrix composites, and particularly discloses a high-entropy alloy binder phase gradient cemented carbide tool material and a preparation method thereof. The high-entropy alloy binder phase gradient cemented carbide tool material comprises a surface layer, a transition layer and a core layer, and the surface layer comprises WC powder 60-70 parts, high-entropy alloy binder phase 0.5-2.0 parts, high-entropy carbide precursor 5-10 parts and composite grain inhibitor 0.3-0.8 parts in terms of mass parts; the transition layer comprises WC powder 45-55 parts and high-entropy alloy binder phase 5-10 parts. In the application, the WC powder, the high-entropy alloy binder phase, the high-entropy carbide precursor, the composite grain inhibitor and the carbon black are matched in the surface layer, the transition layer and the core layer, the carbon black content in each layer presents a gradient distribution, and the high-entropy carbide precursor generates nanoscale high-entropy carbide precipitated phases in situ under the driving of carbon potential, so that the abnormal growth of WC grains is inhibited.

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 invention relates to the field of heat treatment of metal materials, in particular to molybdenum-based die steel and a heat treatment method thereof.The treatment method of the molybdenum-based hot work die steel comprises the steps that the temperature is increased to 700 DEG C, 850 DEG C and 1030 DEG C at the speed of 5 DEG C / min, heat preservation is conducted for 3 h, 2 h and 2 h in sequence, and finally cooling is conducted in a medium; the cooled die steel is heated to 850 DEG C at the speed of 5 DEG C / min, heat preservation is conducted for 3 h, then the die steel is cooled to 735 DEG C in a heat treatment furnace, heat preservation is conducted for 4 h, finally the die steel is cooled to 500 DEG C, and air cooling treatment is conducted; the temperature of the die steel is increased to 1010 DEG C at the speed of 5 DEG C / min, and heat preservation is conducted for 30 min; quenching the die steel subjected to heat preservation in a quenching medium; the quenched die steel is subjected to tempering treatment; by adopting the method provided by the invention, after the obtained hot work die steel is refined and annealed, crystal grains cannot be distributed in a chain shape, carbides are fully redissolved, and the tempering stability is good; the impact toughness of the refined and annealed die steel is higher than that of a traditional spheroidizing annealing process.

The application discloses a kind of cost-reducing thermal mechanical fatigue test pieces and preparation method thereof, belong to single crystal superalloy technical field.The thermal mechanical fatigue test piece of the application includes gauge length section, transition section, base material clamping section, weld and auxiliary material clamping section.The thermal mechanical fatigue test piece preparation includes conformal base material (including gauge length section, transition section and base material clamping section) preparation, auxiliary material preparation and base material and auxiliary material welding.Wherein, base material is expensive single crystal superalloy, and auxiliary material is low-cost single crystal superalloy, to replace most expensive base material with auxiliary material.In addition, in order to save expensive base material, base material is prepared by conformal design and conformal part directional solidification.The single crystal test rod is prepared by directional solidification of auxiliary material.The connection of base material and auxiliary material is completed by welding.The thermal mechanical fatigue test piece designed and prepared by the application significantly reduces cost, and the high-temperature strength of test is high, meets the requirements of thermal mechanical fatigue experiment.

The invention discloses a high-temperature fire-resistant heat-insulation carbon fiber composite material which comprises the following components in parts by weight: 35-50 parts of wollastonite-feldspar composite powder, 25-35 parts of modified porous mullite aggregate, 12-20 parts of calcium aluminate cement, 2-8 parts of modified short carbon fibers, 1.5-2.5 parts of sodium dodecyl benzene sulfonate and 1-2 parts of sodium tripolyphosphate. The preparation method comprises the following steps: S1, weighing the wollastonite-feldspar composite powder, the modified porous mullite aggregate, the calcium aluminate cement and the modified short carbon fibers in proportion, and carrying out dry mixing; s2, adding water into sodium dodecyl benzene sulfonate and sodium tripolyphosphate, and stirring to obtain an auxiliary agent aqueous solution; s3, adding the auxiliary agent aqueous solution into the dry powder mixture, and stirring; s4, transferring the slurry into a mold for hydraulic forming; s5, the formed blank is subjected to curing, demolding, drying, high-temperature sintering and cooling, and the high-temperature fire-resistant heat-insulation carbon fiber composite material is obtained. The fire-resistant and heat-insulating carbon fiber composite material produced by the invention can improve the high temperature resistance and compression strength.

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 discloses an aluminum-silicon carbide-carbon castable special for a metal silicon refining ladle. The aluminum-silicon carbide-carbon castable is prepared from 66-70 parts of tabular corundum aggregate, 0-4 parts of silicon carbide particles, 5-10 parts of silicon carbide powder, 5-8 parts of kyanite, 3-6 parts of corundum powder, 3-5 parts of activated aluminum oxide micro powder, 2-4 parts of silicon micro powder, 2-4 parts of pure calcium aluminate cement, 1-2 parts of metal silicon powder and 1-2 parts of spherical asphalt. The castable is used as an integral lining of the metal silicon refining ladle, has the excellent properties of high strength, high temperature resistance, scouring resistance, thermal shock resistance, slag erosion and permeation resistance and the like, eliminates brick joints, is convenient to construct, and prolongs the service life of the metal silicon refining ladle.

The invention relates to the technical field of alloys, in particular to a molybdenum-based alloy with medium-high temperature oxidation resistance and a preparation method of the molybdenum-based alloy. The molybdenum-based alloy material comprises, by mole, 38%-45% of Ti, 8%-15% of Si, 5%-10% of C, 5%-10% of Cr, 3%-8% of Al and the balance Mo, the problem of catastrophic oxidation'pest 'of other molybdenum-based alloys in the medium-temperature area of 800 DEG C is solved, the low oxidation rate is shown in the air atmosphere of 1100 DEG C, and good medium-high temperature oxidation resistance is achieved; the alloy is composed of a ductile phase Moss, a strengthening phase Ti5Si3 and TiC, and particularly, the volume fraction of the ductile phase Moss exceeds 50%, so that the alloy has good room-temperature fracture toughness and high-temperature strength at the same time.

The invention discloses a piercing plug for rolling a high-alloy steel pipe and a preparation method of the piercing plug. The piercing plug for rolling the high-alloy steel pipe comprises a plug base body, a high-strength alloy layer arranged on the plug base body and an oxidation film layer arranged on the high-strength alloy layer. The high-strength alloy layer is made of cobalt-based alloy; the oxidation film layer is made of iron-based alloy. According to the piercing plug for rolling the high-alloy steel pipe, the high-strength alloy layer is designed on the plug base body, the problem that an oxidation film on the surface of the plug falls off due to high-temperature softening of a supporting part is solved, the problem that steel is bonded due to large temperature rise of the surface of the plug is solved by designing the oxidation film layer, and the piercing plug for rolling the high-alloy steel pipe has good high-temperature strength; and the service life is further prolonged.

The invention discloses a preparation method of a transparent high-temperature-resistant PVC crystal plate, and relates to the technical field of plastic processing. According to the invention, the N-phenylmaleimide cross-linking agent is added during the emulsion polymerization of the acrylate and the 2-phenyl-1, 3-butadiene monomer, and the cross-linking agent can improve the heat resistance of the polymer; after acrylic elastomer colloid is obtained, glycidyl methacrylate and styrene are grafted step by step to form a polymer, and the polymer is added into PVC resin as a heat-resistant cross-linking agent to improve the high temperature resistance of the PVC resin and effectively ensure the light transmission of the resin; secondly, hydroxyl-terminated polydimethylsiloxane and a POE resin matrix are subjected to graft modification through maleic anhydride, the heat resistance of the POE resin subjected to modified melting granulation is optimized, and then the POE resin is blended with PVC resin to form a compact network structure, so that a very excellent heat-resistant effect is achieved; in addition, the transparency of the prepared crystal plate is also ensured. The prepared crystal plate has the effects of high temperature resistance and high transparency.