2457results about How to "Improve mechanical properties" patented technology

The invention relates to a zirconia-based all-ceramic false tooth and a preparation method thereof. A core layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 90 to 94 parts of ZrO2, 5 to 9 parts of Y2O3, 0.1 to 0.5 part of Al2O3, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2, and a shell layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 24.5 to 49.5 parts of CaCO3, 45 to 50 parts of SiO2, 0 to 25 parts of MgO, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2. The preparation process comprises the following steps: performing dry pressing and isostatic pressing on raw materials of the core layer, presintering, and carving to obtain a zirconia-based false tooth biscuit; meanwhile, calcining raw materials of a shell layer, then adding deionized water, a dispersing agent and an adhesive, and carrying out ball milling and mixing to obtain calcium-magnesium-silicon-based ceramic slurry; and coating the calcium-magnesium-silicon-based ceramic slurry on the surface of the zirconium oxide-based false tooth biscuit, and sintering to obtain the zirconium oxide-based all-ceramic false tooth provided by the invention. The zirconia-based all-ceramic false tooth has good jade texture and is closer to the natural color of natural teeth.

The invention discloses a high-resilience eTPU foaming material and a preparation process thereof, and belongs to the technical field of foaming materials. The process comprises the steps of raw material premixing and TPU chain extension reaction, precursor system injection, in-situ phase change energy storage core-shell particle generation, supercritical two-fluid foaming and molding post-treatment. Wherein the SiO2-coated TiO2 core-shell particles are prepared by a non-hydrolytic sol-gel method, the porous SiO2 core adsorbs and fixes the micro-crosslinked polyurethane-based phase change material, the TiO2 shell provides sealing and supporting, the particles are combined with the TPU matrix through covalent bonds, and the micro-crosslinked polyurethane-based phase change material has a unique micro-crosslinked network structure, so that the thermal conductivity of the TPU matrix is improved, and the thermal conductivity of the TPU matrix is improved. The hidden danger of leakage of the phase change material in the using process can be effectively eliminated, and meanwhile the interface bonding effect between the inorganic particles and the TPU matrix is synchronously enhanced. The eTPU foaming material prepared by the invention has the characteristics of high resilience, strong interface bonding, excellent energy storage stability and low compression set, and is suitable for shoe materials, automotive interiors and other scenes.

The invention discloses an assembly type building stair mold, and relates to the technical field of stair molds, the assembly type building stair mold comprises a mold mechanism, the side face of the mold mechanism is provided with a transverse steel bar limiting mechanism, and the transverse steel bar limiting mechanism is used for limiting and fixing transverse steel bars in a prefabricated stair. According to the longitudinal reinforcement limiting mechanism, the height of a clamping head is accurately adjusted through a third mounting bolt, the clamping head can be flexibly selected according to the diameter of a longitudinal reinforcement, the mounting height and position of the longitudinal reinforcement can be accurately controlled, the overall positioning accuracy of a reinforcement framework is guaranteed, and then the mechanical property of the prefabricated stair is improved; the sleeve plays a role in protecting the end, inserted into the mold mechanism, of the third mounting bolt, it is avoided that concrete adhesion affects bolt disassembly, meanwhile, due to the detachable design of the third mounting bolt and the modular structure of the steel bar limiting mechanism, the demolding difficulty is lowered, damage to stairs after a component is formed is reduced, and the demolding efficiency and the finished product quality are improved.

The invention belongs to the technical field of ceramic materials, and particularly discloses whisker toughened zirconium oxide-aluminum oxide composite ceramic and an additive manufacturing method thereof, the composite ceramic comprises the following components by mass: 94 parts of zirconium oxide toughened aluminum oxide ceramic and 5 parts of silicon carbide whisker; the zirconium oxide toughened aluminum oxide ceramic is prepared from the following components in parts by mass: 76 parts of aluminum oxide and 24 parts of zirconium oxide, and 3mol% of yttrium oxide is added into the zirconium oxide. According to the whisker toughened zirconium oxide-aluminum oxide composite ceramic and the additive manufacturing method thereof, the preparation method has unique design of components and process, and the preparation of a high-density and high-performance ceramic-based composite material part based on a fused deposition modeling technology is successfully realized. Further, the prepared silicon carbide whisker toughened zirconium oxide-aluminum oxide-based composite ceramic has relatively high density and excellent obdurability.

The invention relates to the technical field of biological medicines, in particular to a soluble skin-adhering microneedle for delivering an inactivated enterovirus vaccine as well as a preparation method and application of the soluble skin-adhering microneedle. Sodium hyaluronate is adopted as a film forming material to wrap an enterovirus 71 type (EV71)-coxsackie virus A16 (CA16) type bivalent inactivated vaccine antigen, and a needle body layer of the soluble microneedle is formed; the substrate layer is prepared from a pullulan material, so that the microneedle patch with a stable overall structure is formed. The technology provided by the invention is completed in a clean environment, and the vaccine patch which is qualified through sterility detection is obtained. The soluble microneedle disclosed by the invention has good antigen stability under the condition of 2-8 DEG C. In animal experiments, the microneedle is attached to the skin surface of a mouse for skin-adhering immunization, a strong immune response reaction can be induced, good immunogenicity is shown, and a novel, safe and effective vaccine delivery way is provided for prevention and control of the infantile hand-foot-and-mouth disease.

The invention discloses a method for preparing a C / C-SiC composite material through multi-stage recovery of carbon / carbon composite material processing waste, and belongs to the technical field of C / C composite material preparation. The method comprises the following steps: carrying out multi-stage screening treatment on the carbon / carbon composite material processing waste, and screening and separating short carbon fibers and pyrolytic carbon powder; mixing the screened short carbon fibers and pyrolytic carbon powder with phenolic resin, industrial silicon powder and SiC powder, and preparing a fiber reinforced resin block in a mold pressing manner; and carrying out one-step continuous carbonization and ceramic heat treatment on the fiber reinforced resin block to finally obtain the C / C-SiC composite material. According to the method, high-added-value recycling of the C / C processing waste is achieved, the process is simple, the cost is low, operation is convenient and fast, the problems of resource waste and environmental pollution caused by existing waste treatment are solved, and the prepared C / C-SiC composite material is excellent in performance and can be widely applied to the fields of aerospace, high-end manufacturing and the like.

The invention discloses a microalloyed high-toughness martensitic stainless steel cutter head as well as a preparation method and a preparation mold thereof. Stainless steel comprises the following components in percentage by weight: 0.3%-0.7% of C, 0.3%-1.0% of Si, 0.5%-1.5% of Mn, 16%-18.5% of Cr, 1%-2% of Ni, 0.3%-0.8% of Mo, 0.1%-0.35% of V, 0.1%-0.25% of Nb, less than or equal to 0.02% of S, less than or equal to 0.02% of P and the balance of Fe. Firstly, raw materials are smelted into molten iron; then adding a deoxidizing agent and precoated sand into the molten iron for molding, and performing sand mold casting and pouring to obtain a cutterhead blank; carrying out heat treatment on the cutter head blank; and finally, shot blasting and polishing are conducted on the cutterhead subjected to heat treatment. The martensitic stainless steel cutterhead has a metallographic structure which takes a martensitic structure as a main structure, takes austenite as an auxiliary structure and dispersedly distributes CrC, VC and NbC particles, the hardness of the martensitic stainless steel cutterhead is 40-45 HRC, the impact toughness of the martensitic stainless steel cutterhead reaches 92-95 J / cm < 2 >, the abrasion resistance of the cutterhead is longer, the service life of the cutterhead is longer, and the abrasion loss of the martensitic stainless steel cutterhead is reduced by 70% compared with a cutterhead without alloy elements.

The invention relates to the technical field of preparation of silicon carbide ceramics, in particular to an in-situ reaction sintered silicon carbide ceramic and a preparation method thereof.The preparation method comprises the following technological stages which are conducted in sequence: S1, preparation of silicon carbide slurry, specifically, organic matter precursor raw materials are weighed according to the mass content percentage to form the silicon carbide slurry; s2, vacuum grouting: injecting the silicon carbide slurry in the vacuum grouting tank into the shaping mold from the bottom of the shaping mold to form a silicon carbide green body; and S3, in-situ reaction sintering is conducted, specifically, the silicon carbide green body is placed in a sintering furnace, heating, heat preservation and cooling are conducted on the silicon carbide green body in the argon atmosphere through a segmented temperature control technology, and the silicon carbide ceramic is obtained. The silicon carbide ceramic prepared by the method disclosed by the invention has relatively high density and excellent mechanical properties.

The invention relates to the technical field of composite materials, in particular to a silicone rubber composition and a preparation method thereof. The silicone rubber composition is prepared from the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 25-35 parts of white carbon black, 2.8-3.0 parts of hydroxyl silicone oil, 1.1-1.2 parts of hydrogen-containing silicone oil, 0.8-1 part of a cross-linking agent, 20-30 parts of an additive A, 6-8 parts of an additive B and 1.5 parts of a silane coupling agent KH-550. The additive in the additive A is carbonized and forms an intumescent flame-retardant system in the reaction under the combined action of mannitol and bamboo fiber, and generates a flame-retardant gas during decomposition, so that the fire resistance and flame retardance of the silicone rubber composition can be effectively improved, and meanwhile, the additive B is capable of effectively improving the flame retardance of the silicone rubber composition based on the loading of blumea oil and chitosan quaternary ammonium salt. The blumea oil endows the material with an anti-aging function through the good anti-oxidation characteristic, so that the thermal stability and durability of the silicone rubber composition are effectively improved under the combined action of the additives.

The present application aims at the problems of excessive consumption of traditional cement limestone resources, excessive energy consumption and high carbon emission, and provides a carbonated hardened low-calcium cement and a preparation and hardening method thereof, which is a hardening method for curing low-calcium cement by CO2 carbonation. The mass percentage composition of cement raw material components is: limestone: 60-70%, sandstone or clay or silica ash: 15-25%, phosphogypsum, fluorogypsum or desulfurization gypsum: 5-25%, component A: 0.5-2%. Component A is composed of the following raw material components in mass percentage: fluorite 0-50%, barium slag: 0-50%, lithium slag 0-50%, wood ash 0-50%, industrial sodium carbonate 0-30%. The composition design of carbonated hardened cement clinker minerals is C2S: 10-90%, C5S2$: 10-90%, C$: 0-5%, C4A3$: 0-10%, etc. In the present application, the limestone required for the cement clinker is lower than that of ordinary Portland cement clinker, the calcination temperature is reduced by 200-350 DEG C than that of ordinary Portland cement clinker, and the energy consumption and carbon emission are significantly lower than those of Portland cement; the low-calcium cement is hardened by CO2 carbonation curing, which can make the cement obtain excellent mechanical properties within 2 hours.

The invention discloses a polypropylene composite material with high dielectric constant, high strength and high modulus as well as a preparation method and application thereof, and belongs to the technical field of polymer composite materials. According to the composite material, homo-polypropylene is used as a matrix and matched with a high-dielectric-constant composite filler, a modified reinforcing filler and a functional additive, and through reasonable component design and process optimization, the dielectric property and the mechanical property are synergistically improved. Wherein the barium titanate-graphene with the core-shell structure is used as a high-dielectric-constant composite filler, and an efficient dielectric path can be constructed in a polypropylene matrix; the epoxy resin modified chopped glass fiber can significantly enhance the mechanical strength and modulus of the material; the maleic anhydride grafted polypropylene effectively improves the interfacial compatibility of the filler and the matrix. The dielectric constant (10GHz) of the prepared composite material is greater than or equal to 8, the tensile strength is greater than or equal to 60 MPa, and the bending modulus is greater than or equal to 4000 MPa. The composite material has excellent dielectric properties and mechanical properties, and can be widely applied to the fields of electronic appliances, high-frequency communication, new energy automobiles and the like.

The invention relates to a novel migration-resistant PVC sealing material and application thereof. The PVC sealing material is prepared from, by weight, 40-50 parts of PVC resin, 20-40 parts of a plasticizer, 10-25 parts of filler, 1-5 parts of a stabilizer and 2-10 parts of a microsphere modifier. The sealing material not only has excellent migration resistance and low temperature resistance, butalso has excellent mechanical properties and good resilience, and ensures good sealing of refrigeration equipment such as refrigerators and the like; and meanwhile, the price is relatively low, costcontrol is facilitated, and the sealing strip is very suitable for being widely popularized as a refrigeration equipment sealing strip.

The invention discloses a self-powered flexible sensor and a preparation method thereof, and belongs to the field of electronic skin, man-machine interaction, flexible electronic devices and sensors. The invention relates to a cellulose acetate-based ionic gel self-energized flexible sensor which is prepared from cellulose acetate, ionic liquid, a polymer monomer, a cross-linking agent and an initiator and has good mechanical property and antibacterial property, the cellulose acetate enhances the mechanical property of the gel through non-covalent crosslinking, and the ionic liquid plays a conductive role. The flexible sensor has good conductivity, high sensitivity and stability, and can be stretched, twisted and bent. Meanwhile, the high transparency and excellent biocompatibility can be realized, so that the electronic skin can be used as the electronic skin for multifunctional perception and integrated application. The material is environment-friendly, the preparation method is simple, the operability is high, the application field is wide, and the prospect is wide.

The invention discloses heat-resistant modified epoxy resin and a preparation method thereof, and belongs to the technical field of high polymer materials. The heat-resistant modified epoxy resin is prepared from the following components in parts by mass: 45 to 55 parts of matrix epoxy resin, 10 to 20 parts of methyl phenyl silicone resin, 8 to 12 parts of nano silicon dioxide, 0.8 to 2.0 parts of a silane coupling agent, 6 to 10 parts of a curing agent, 0.3 to 0.8 part of an accelerant, 15 to 30 parts of silica fume powder and 0.5 to 1.2 parts of an antioxidant. By introducing components such as methyl phenyl silicone resin and nano silicon dioxide with a specific particle size, and combining the synergistic effect of the silane coupling agent, the heat resistance of the epoxy resin is effectively improved; the antioxidant with a specific structure is used, and the performance retention rate of the modified epoxy resin under a thermo-oxidative aging condition is remarkably improved, so that the service life of the material is prolonged, and the long-term stability of the material in a high-temperature environment is enhanced.

The application belongs to the technical field of polymer materials, and particularly relates to a high-performance fiber composite material and a preparation method thereof. The preparation method of the high-performance fiber composite material comprises the following steps: adding pretreated aluminum oxide whiskers into a solvent, then adding pretreated carboxymethyl cellulose and gallic acid, and heating to reflux to obtain modified aluminum oxide whiskers; then mixing epoxy resin, the modified aluminum oxide whiskers, a curing agent and an accelerator uniformly to coat a film to obtain a resin adhesive film; and compounding the resin adhesive film and carbon fibers through hot pressing to obtain carbon fiber prepreg, and heating and curing the obtained prepreg to obtain the high-performance fiber composite material. The fiber composite material obtained by the application not only has high strength and rigidity, but also has excellent toughness, can effectively resist the impact of the external environment, has oxidation resistance and long-term stability, and has a wide application prospect in the fields of aerospace and new energy equipment.

The invention provides an MXene / CNF composite mesoporous fiber material as well as a preparation method and application thereof. The preparation method comprises the following steps: injecting an MXene / CNF spinning solution into an acetic acid coagulating bath, fishing out the MXene / CNF spinning solution, and air-drying the MXene / CNF spinning solution to obtain the MXene / CNF composite mesoporous fiber material, the MXene / CNF spinning solution is a dispersion liquid of nano cellulose and MXene in water. According to the MXene / CNF composite mesoporous fiber material with high conductivity and narrow distribution, the mesoporous structure not only effectively transfers stress, but also contributes to rapid transmission of electrons and ions, has a relatively high application prospect in the fields of electromagnetic shielding, wave absorption, energy storage device electrodes and flexible sensors, and can be widely applied to the fields of electromagnetic shielding, wave absorption, energy storage device electrodes and flexible sensors. And a novel multifunctional platform is expected to be provided for wearable electronic equipment, electronic skin, human body motion monitoring equipment and the like.

The present application provides a kind of cellulose fiber and its preparation method, first NMMO aqueous solution is heated and stirred, and cellulose raw material is added to the prepared NMMO aqueous solvent, and heated and stirred;Then the blend after swelling is dissolved by stirring and vacuumizing, and then the obtained cellulose solution is continuously heated and stirred, while adding spinning aid, after stirring, centrifugal spinning dope is obtained, finally the obtained spinning dope is injected into syringe, and cellulose filament is spun at low temperature by push pump.The method can reduce the temperature of cellulose spinning relative to the spinning method of NMMO water system, and can effectively reduce the energy consumption of industrial production of cellulose fiber, and the method is obvious at low cellulose concentration, which has great economic advantage in the differentiation production of lyocell fiber.

The present application belongs to the technical field of glass fiber sizing agent, and particularly relates to an anti-creep glass fiber sizing agent and a preparation method thereof. The anti-creep glass fiber sizing agent comprises effective components and water, and the solid content of the anti-creep glass fiber sizing agent is 3-12%. The effective components comprise the following components according to weight percentage: maleic anhydride modified long-chain branched polyolefin wax 65.5-86.9 wt.%, coupling agent 5-10 wt.%, nucleating agent 1-8 wt.%, physical cross-linking component 5-12 wt.%, initiator 0.1-0.5 wt.%, and surfactant 2-4 wt.%. The present application can effectively solve the problem of insufficient anti-creep ability of the glass fiber reinforced polypropylene material in the prior art, and at the same time, the material has good mechanical properties and fatigue resistance, which plays an important role in improving the long-term dimensional stability of the polypropylene material.

This invention discloses a method for preparing high-purity oxygen-free copper, relating to the field of metallurgical technology. The method includes multi-stage electrolytic refining, gradient-heating vacuum melting, inert gas-protected refining, electron beam melting, hydrogen plasma arc melting, directional solidification, and post-treatment steps. The multi-stage electrolytic refining utilizes a specific component electrolyte and periodically commutated current; vacuum melting is combined with bidirectional electromagnetic stirring; inert gas-protected refining is combined with a gradient reduction composite covering agent; electron beam and hydrogen plasma arc melting achieve deep purification and deoxidation; and directional solidification and two-stage annealing ensure product performance. The high-purity oxygen-free copper prepared by this invention has a conductivity of 102.3% IACS, a copper content ≥99.9999%, and an oxygen content <1.0 ppm. It exhibits high purity, low oxygen content, and excellent conductivity. The process is stable and controllable, making it suitable for high-end electronics applications.

This invention provides a plasma-modified glass fiber reinforced polyetheretherketone (PEEK) composite material and its preparation method, belonging to the field of glass fiber reinforced materials. The composite material is prepared by treating a PEEK film and glass fiber cloth with glow discharge plasma, followed by hot pressing, resulting in a composite material with good compatibility between PEEK and glass fiber. This method can significantly improve the interfacial bonding strength between glass fiber and PEEK resin, thereby improving the mechanical properties of the composite laminate. The interlaminar shear strength of the composite material is increased by 43% compared to the untreated composite material. Furthermore, this method also has the advantages of energy saving, environmental protection, short processing time, and high efficiency.

The present application relates to the low temperature curing high-strength benzoxazine type silicone adhesive formula and use method, the formula includes the benzoxazine group containing organic silicon compound and organic alkali compound, the mass ratio of benzoxazine group containing organic silicon compound, organic alkali compound is 100:0.1-20.The adhesive of the present application is based on the cooperation between the benzoxazine group containing organic silicon compound and the basic catalyst, can be cured at low temperature, realize the higher strength bonding.The benzoxazine type silicone adhesive formula provided by the present application can be directly used as adhesive, and the bonding strength is high;It can also be used as a basic formula, used as an adhesive after adding other fillers, to meet the different needs of various special occasions.

The application discloses an anti-ultraviolet aging polycarbonate modified material and application thereof, and belongs to the technical field of polymer material modification. The material comprises synergistically modified polycarbonate, an organic small-molecule functional regulator, an antioxidant, a light stabilizer, a lubricating dispersant and an inorganic filler, wherein the synergistically modified polycarbonate is constructed into a multiple synergistic network by introducing a borate dynamic covalent structure, a Schiff base structure and a rare earth coordination structure, and the organic small-molecule functional regulator is p-hydroxybenzophenone. The preparation method comprises preparation of the synergistically modified polycarbonate and a subsequent melt blending and extrusion process. Through the technical scheme, the synergistic effect of ultraviolet absorption, energy transfer and free radical inhibition is realized, the yellowing degree of the material is significantly reduced, the mechanical property retention rate and the optical stability are improved, and the material is suitable for the fields of automobile transparent parts, outdoor optical materials and electronic and electrical shell.

The application relates to the technical field of cables, and discloses an insulated high-temperature superconducting cable and a preparation method thereof. The insulated high-temperature superconducting cable comprises, from inside to outside, a lining core, a superconducting conductor, an insulation layer, a shielding layer, a heat insulation pipe and a sheath layer. The raw material of the sheath layer comprises the following components in parts by weight: 100 parts of polyvinyl chloride, 10 to 15 parts of ethylene-vinyl acetate copolymer, 4 to 6 parts of silicone rubber, 20 to 30 parts of composite filler, 5 to 8 parts of compatilizer, 2 to 5 parts of stabilizer and 6 to 10 parts of plasticizer. The raw material of the composite filler comprises the following components in parts by weight: 40 parts of palygorskite powder, 2 to 5 parts of chitosan and 4 to 8 parts of vinyl chloride-methyl methacrylate copolymer. The palygorskite powder, the chitosan and the vinyl chloride-methyl methacrylate copolymer are compounded to form the composite filler, and the composite filler is added into the cable sheath layer, so that the mechanical properties of the cable sheath layer can be effectively improved.

This invention relates to hot-stamped components and a method for manufacturing the same. The hot-stamped component comprises a steel plate and an Al-Si based coating layer formed on at least one surface of the steel plate. Residual stress exists in the steel plate of the hot-stamped component, and the peak position of the diffraction lines is changed by altering the incident angle φ while irradiating the steel plate with X-rays. The slope M is obtained by linear regression using the least squares method, and the slope M is multiplied by the residual stress value calculated from the stress constant K obtained from the Young's modulus and Poisson's ratio of the steel plate according to Equation 1, which is between 5 MPa and 70 MPa. [Equation 1] K = -E / 2(1+v)*cotθ*π / 180, where E is the Young's modulus in MPa, v is the Poisson's ratio, and M is the slope of the regression line 2θ-sinθ. 2 θ and 2θ are the diffraction angles in ° without strain, and K is the stress constant in MPa.

The application relates to the field of adsorbents, and discloses a LiLSX molecular sieve adsorbent and a preparation method thereof. The method comprises the following steps: 1) sequentially performing molding treatment, first drying and first calcination on a mixture of kaolin and NaLSX molecular sieve powder to obtain a first calcination product; 2) performing pre-wetting treatment on the first calcination product to obtain a pre-wetting product; 3) contacting the pre-wetting product with alkali and a silicon source or contacting the pre-wetting product with alkali and an aluminum source in the presence of water to obtain a contact product; 4) performing second drying and second calcination on the contact product to obtain a second calcination product; and 5) performing lithium ion exchange on the second calcination product by using an exchange solution containing lithium ions, and the amount of the NaLSX molecular sieve powder is 85% or more in weight based on the total weight of the mixture. The method can make the prepared LiLSX molecular sieve adsorbent have excellent adsorption performance and mechanical strength.

This application relates to the field of functional polymer materials technology, and provides a photoresist, a photoresist-cured film, and a method for patterning the photoresist. The photoresist comprises a polyamic acid-polyamide ester resin, an alkaline catalyst, a crosslinking agent, a coupling agent, a photoresist, and a first organic solvent. The photoresist can simultaneously achieve imidization and curing of the polyimide resin therein at a relatively low temperature, and the cured photoresist-cured film exhibits warp resistance and high mechanical strength.

This invention relates to the field of polymer materials, specifically to an automotive interior material and its preparation method, comprising PVC resin and a composite heat stabilizer; the composite heat stabilizer comprises a calcium-zinc heat stabilizer, a polyol phosphate ester, and amino POSS, wherein the mass ratio of the PVC resin to the composite heat stabilizer is 20-40:1, and the mass ratio of the calcium-zinc heat stabilizer, the polyol phosphate ester, and the amino POSS is 1-5:1-5:1-5. The automotive interior material prepared by this invention has good thermal stability and mechanical properties, and excellent heat aging resistance.

The application belongs to the technical field of high polymer materials, and particularly relates to an anti-static polycarbonate composite carrier tape and a preparation method thereof. The application provides an anti-static polycarbonate composite carrier tape which is composed of the following components in parts by weight: 70-80 parts of silicon-containing polycarbonate, 8-10 parts of carbon black material, 6-8 parts of polyethylene terephthalate, 4-6 parts of polyolefin, 0.4-0.6 parts of antioxidant, and 0.4-0.6 parts of heat stabilizer. The preparation method of the silicon-containing polycarbonate comprises the following steps: first, performing a temperature rising reaction by taking hydrogen-terminated silicone oil and eugenol as raw materials to obtain phenolic hydroxyl silicone oil; and then mixing diphenyl carbonate, bisphenol A and the phenolic hydroxyl silicone oil to perform a copolymerization reaction to obtain the silicon-containing polycarbonate. The composite carrier tape can achieve good anti-static effect, and can also improve the thermal deformation temperature and mechanical properties of the material.

The invention relates to the field of metallurgy, and discloses a large-size maraging stainless steel bar and a preparation method thereof, the diameter of the bar is larger than or equal to 300 mm, and the method comprises a vacuum induction melting stage, a vacuum consumable remelting stage, a fast forging cogging stage and a precision forging forming stage; wherein the vacuum consumable remelting stage comprises an arcing stage, a stable smelting stage and a filling smelting stage; in the arc starting stage, a molten pool is formed by adopting a current of 8-12 kA; in the stable smelting stage, the smelting speed is 4.2-4.8 kg / min, the molten drop is 3-5 s <-1 >, the molten drop short-circuit time is 0.6-0.8 s, and inert gas is started to be filled for cooling after smelting is conducted by the preset weight; and in the filling smelting stage, inert gas filling is stopped, and the current and the melting speed are controlled to descend in a stepped mode. According to the method, the uniformity of components and structures can be improved, so that the mechanical property of the large-size maraging stainless steel bar is improved.

The invention relates to the field of refractory materials, in particular to a high-strength refractory material and a preparation method thereof, which are used for solving the problem that the existing traditional refractory material is low in strength and difficult to meet the high-standard requirement of modern industry on equipment. The high-strength refractory material comprises the following components: silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, titanium diboride and a phosphorus-containing phenyl multi-epoxy-group binding agent, according to the preparation method, silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide and titanium diboride are taken as main raw materials, the main raw materials are endowed with excellent mechanical properties, and after a phosphorus-containing phenyl polyepoxy binding agent is added, the mechanical properties of the main raw materials can be further remarkably improved, so that the prepared refractory material has the characteristics of high strength, high temperature resistance and the like. The composite material shows high durability and reliability in a high-temperature environment, and is suitable for thermal protection in the high-temperature environment and internal construction of high-temperature equipment.