27results about How to "Promote densification" patented technology

The application provides a preparation process of high-strength concrete, and belongs to the technical field of concrete, and comprises the following steps: step S1, Mg-Al-LDH-NO2 powder is prepared; step S2, microcapsules are prepared; step S3, machine-made sand, granite crushed stone, Portland cement, slag powder, limestone powder, metakaolin, microcapsules, water, a water reducing agent and Mg-Al-LDH-NO2 powder are mixed and stirred to obtain high-strength concrete. The application can achieve the purpose of improving the strength and durability of concrete.

This invention discloses a method for preparing silicon carbide fibers with an in-situ boron nitride coating. The method involves melt spinning a metal-doped polycarbosilane precursor to obtain doped polycarbosilane precursor fibers. These precursor fibers are then subjected to a non-melting treatment in an oxidizing atmosphere to obtain non-melting fibers. The non-melting fibers are then subjected to inorganic pyrolysis to obtain inorganic fibers. These inorganic fibers are then densified and sintered to obtain boron-containing SiC fibers. Finally, the boron-containing SiC fibers are subjected to high-temperature treatment in a nitrogen atmosphere to obtain silicon carbide fibers with an in-situ boron nitride coating. This invention provides a simple preparation method, resulting in an in-situ self-grown BN coating with high crystallinity, good stability, and excellent uniformity. The coating is tightly bonded to the SiC fibers, is low-cost, and can be mass-produced. Furthermore, it significantly improves the fiber's temperature resistance and high-temperature creep resistance, allowing the fiber to serve for extended periods at higher temperatures.

The application discloses a preparation method of a high-strength aluminum nitride substrate and relates to the technical field of aluminum nitride substrate preparation. The method comprises the following steps: preparing modified aluminum nitride powder; adding a non-oxygen composite sintering aid composed of fluorides and borides to the modified aluminum nitride powder to obtain a mixture; the adding amount of the composite sintering aid is 0.5wt%-5wt% of the total mass of the modified aluminum nitride powder; the mixture, a binder and a dispersant are mixed in a planetary ball mill to obtain a uniform slurry; the slurry is subjected to flow casting to form a green porcelain embryo, and then, glue removal treatment is performed under the protection of flowing inert gas to remove the binder; the green porcelain embryo after glue removal is placed in an atmosphere sintering furnace to perform a multi-stage temperature rising sintering procedure to form a ceramic body; and the sintered ceramic body is subjected to heat treatment and then cooled to obtain the aluminum nitride substrate. The application reduces the lattice thermal resistance of the aluminum nitride substrate and improves the mechanical strength of the aluminum nitride substrate.

The application relates to the technical field of special functional coating materials for lost foam casting, and particularly discloses a cast iron lost foam and universal coating for full mold casting and application thereof. The cast iron lost foam and universal coating for full mold casting comprises quartz powder, calcined bauxite, modified fly ash microbeads, microcrystalline graphite and an additive; the modified fly ash microbeads comprise fly ash and a composite coating layer coated on the surface of the fly ash, and the composite coating layer comprises aluminum oxide nanosheets and magnesium ion doped amorphous substances. Through functional design of key components, the coating can dynamically adjust its performance according to the temperature and chemical environment of the contact interface, can meet the high air permeability requirement of the lost foam process, can take into account the differentiated requirements of different cast iron materials on high-temperature strength, permeability resistance and interface purity, and can be compatible with both conventional negative pressure and non-negative pressure conditions, so that the universal coating is realized, and production management and supply chain processes are greatly simplified.

The invention relates to the technical field of silicon carbide ceramics, in particular to an in-situ induced low-temperature eutectic silicon carbide porous ceramic and a preparation method thereof. The material is prepared by mixing and sintering the following materials: silicon carbide, a synergistic sintering system, a dispersing agent, a plasticizer and water, wherein the synergistic sintering system comprises the following components: pregelatinized starch, a silicate mineral material, aluminum oxide, calcium carbonate, glass powder and rare earth oxide; the pregelatinized starch is adopted as an adhesive, the thermal decomposition behavior of the pregelatinized starch and the chemical reaction activity of the glass powder and the calcium carbonate form synergy in the process, seamless connection of the whole process from the room temperature to the sintering temperature is achieved, the sintering temperature is greatly reduced, meanwhile, the glue discharging step is omitted, and the silicon carbide porous ceramic product with good performance and few defects is obtained.

The invention discloses a viscosity modified material for keeping the homogeneity of self-compacting concrete, a preparation method and application. The material comprises the following components in parts by mass: fly ash, slag powder, metakaolin, cellulose ether, limestone powder, zeolite powder, an air entraining agent, a functional component A and a functional component B, wherein the functional component A is prepared by compounding and drying nano silica fume, modified carbon nanotubes subjected to ultrasonic dispersion by sodium dodecyl benzene sulfonate / absolute ethyl alcohol and tungsten disulfide subjected to activation-silanization-polycarboxylic acid modification treatment, and the functional component B is prepared by shearing and uniformly mixing magnesium oxide and a calcium expanding agent at a high speed. The material can improve the viscosity, delay segregation and bleeding and reduce the water use sensitivity under the condition that the yield stress is not obviously improved, meanwhile, the early strength development is promoted, the volume stability is improved, and the durability such as chloride ion permeation resistance is improved, so that the homogeneity and quality consistency of a component in the pouring process and after hardening are guaranteed.

The application discloses a preparation method of a titanium nitride coating and application of the titanium nitride coating. The preparation method of the titanium nitride coating comprises the following steps: adopting a coaxial magnetron plasma acceleration method, taking industrial pure titanium as an acceleration electrode material, performing pulse discharge, and generating titanium plasma of the acceleration electrode material; under the action of electromagnetic force, the titanium plasma forms a titanium plasma jet at an outlet of the acceleration electrode; the titanium plasma jet reacts with nitrogen-containing gas to deposit and form the titanium nitride coating on a substrate surface. The coaxial magnetron plasma acceleration method is adopted, industrial pure titanium is used as an acceleration electrode, and nitrogen-containing gas is used as a specific material input source to form the titanium plasma jet. The high-speed and high-reactivity titanium plasma jet is beneficial to enhancing the impact, spreading, diffusion and reaction process of the deposition particles on the substrate surface, promoting the densification of the coating and the stable combination between the coating and the substrate, and the titanium nitride coating with high bonding strength and good wear resistance can be obtained.

The invention relates to the technical field of waste liquid treatment, in particular to a self-adaptive pH amphoteric polymer-calcium salt compounded bentonite slurry rapid sedimentation treatment method. According to the method, a calcium salt working solution, a buffer working solution, an amphoteric polymer working solution and a functionalized calcium carbonate micro-powder dispersion solution are added in stages, and the stirring speed and time are accurately controlled, so that rapid sedimentation of the slurry is realized. The amphoteric polymer is formed by copolymerizing a plurality of monomers and has wide pH adaptability; the functionalized calcium carbonate micro powder is used as a weighting carrier to enhance the floc density. The method solves the problems of slow sedimentation, high supernatant turbidity and poor adaptability to water quality fluctuation in the traditional method, has the advantages of high sedimentation speed and high supernatant clarity, can be directly reused, and is suitable for bentonite slurry treatment in the fields of electric power engineering and the like.

The invention discloses a zirconia ceramic matrix with high thermal shock resistance as well as a preparation method and application thereof. The zirconia ceramic matrix comprises a matrix and a coating layer a; the matrix comprises the following components: 90-98 wt% of zirconium oxide; 1.5 to 8 wt.% of a stabilizing agent; % of a grain boundary regulating agent; the stabilizing agent is prepared from the following components in percentage by weight: 2.0 to 4.0 percent of Sc2O3, 0.5 to 1.5 percent of Yb2O3 and 0.3 to 1.0 percent of Er2O3; the grain boundary regulating agent is a composition of a boron source and an aluminum source; in the coating layer a, the molar ratio of zirconium to aluminum is (2-3): 1; and the component 1 is polyvinyl alcohol or polyvinylpyrrolidone. The fracture toughness, bending strength and thermal shock resistance of the ceramic matrix are effectively improved, and the overall mechanical property is remarkably improved. When the material bears thermal shock, the thermal shock resistance of the material is improved, and the application scene of the zirconia ceramic material is expanded.

The invention discloses a modified aramid nanofiber / rubber composite material and a preparation method thereof.Aramid nanofibers with good water dispersibility are prepared through epoxy modification, the in-situ polycondensation effect of a silicate ester compound on the surfaces of the nanofibers is improved through a nucleophilic substitution reaction of epoxy groups and amino groups, ANFs (at) SiO2 is formed, and the modified aramid nanofiber / rubber composite material is prepared. The composite material with excellent physical and mechanical properties and ablation resistance can be obtained by using the ANFs (at) SiO2 reinforced rubber with lower parts by weight. In the ablation process, the nano silicon dioxide is firstly melted to form a protective film to coat the surface of the aramid nano fiber, so that the aramid nano fiber is prevented from being corroded and decomposed by heat flow, ceramic structures such as SiC and Si3N4 are generated in situ to promote densification of a carbon layer, and the ablation resistance of the rubber is remarkably enhanced.

The invention discloses a high-strength low-thermal-conductivity refractory castable and a preparation method thereof, and belongs to the technical field of refractory materials. The high-strength low-thermal-conductivity refractory castable comprises the following raw materials in parts by weight: 50-75 parts of refractory aggregate, 10-30 parts of matrix fine powder, 5-10 parts of a binding agent, 0.5-1 part of a dispersing agent, 0.3-0.5 part of a water reducing agent and 5-10 parts of deionized water. The high-strength low-heat-conductivity refractory castable prepared by the invention has a low heat conductivity coefficient and good compressive strength.

The application relates to the field of heat-sensitive ceramic materials, in particular to a high-stability rare earth-containing six-component low-resistance high-B-value NTC heat-sensitive ceramic material and a preparation method thereof. The raw material scheme of the NTC heat-sensitive ceramic material comprises trimanganese tetraoxide, nickel protoxide, reinforcing material, lanthanum trioxide, combined functional material and trimolybdenum tetraoxide. The final heat-sensitive ceramic material prepared by the application successfully breaks the technical bottleneck that the resistivity and the B value are restricted to each other in traditional NTC heat-sensitive ceramic materials, realizes good unification of low resistance and high sensitivity, significantly improves the accuracy and response speed of temperature detection; meanwhile, the long-term stability of the material under harsh service conditions such as high-temperature storage, humid heat environment and cold and hot impact is greatly improved, the resistance value drift is effectively inhibited, and the strict requirements of high-reliability scenes such as automobile electronics, industrial control and new energy battery management systems on long-term precise monitoring of temperature sensors can be met.

The application discloses high-strength low-thermal-conductivity refractory castable and a preparation method thereof, and belongs to the technical field of refractory materials. The high-strength low-thermal-conductivity refractory castable comprises the following raw materials in parts by weight: refractory aggregate 50-75 parts, matrix fine powder 10-30 parts, binding agent 5-10 parts, dispersing agent 0.5-1 part, water reducing agent 0.3-0.5 part, and deionized water 5-10 parts. The high-strength low-thermal-conductivity refractory castable prepared by the application has low thermal conductivity and good compressive strength.

This invention discloses a samarium-based rare-earth permanent magnet bulk material, its preparation method, and its application. (The last part, "ThMn," appears to be an incomplete sentence or fragment and is left untranslated.) 12 A uniform metallic T coating is formed on the surface of the magnetic powder. The composite magnetic powder is then oriented, pressed into blocks, and heat-treated to create a double-layered non-magnetic shell around the grains. This shell hinders domain movement, effectively improving the material's coercivity. Furthermore, compared to doping or melting, the coating process requires less T and allows for more precise control, preventing excessive T from entering the crystal lattice and negatively impacting the material's intrinsic magnetic properties, thus significantly improving the coercivity of ThMn. 12 Density and overall performance of rare earth permanent magnets.

The application discloses a composite reinforced tungsten wire base material and a preparation method thereof, and the composite reinforcement is realized through integrated reinforcement of fine-grain reinforcement, solid solution reinforcement and second-phase reinforcement. The fine-grain reinforcement is realized through high and low two-stage sintering processes based on high grain boundary migration activation energy inflection point temperature and nanometer dispersion phase grain growth inhibition synergy of a base phase; the solid solution reinforcement is realized through tungsten-molybdenum solid solution formation; and the second-phase reinforcement is realized through zirconium-containing nanometer dispersion phase and rare earth oxide nanometer dispersion phase synergy. The nanometer dispersion phase in the tungsten wire base material has a particle size of less than 50 nm, the tungsten-molybdenum solid solution base phase has a grain size of less than 1 micrometer, and the tungsten wire base material has the remarkable characteristics of high wire drawing production efficiency, high product yield, high wire strength and low production cost.

The application belongs to the technical field of ion sieve adsorption, and particularly relates to a manganese-based ion sieve composite hydrogel and a preparation method thereof. 1.6 Mn 1.6 O4 precursor, and further processing obtains H 1.6 Mn 1.6 O4 ion sieve. The H 1.6 Mn 1.6 O4 ion sieve is mixed with a photo-thermal agent and a surfactant to obtain an HMO suspension; the HMO suspension is mixed with a gelatin aqueous solution, acrylamide and a pore-forming agent to obtain a hydrogel premix; the hydrogel premix is subjected to low-temperature initiation and high-temperature curing, and then is soaked in deionized water to obtain the manganese-based ion sieve composite hydrogel. The composite hydrogel prepared by the application has strong lithium ion adsorption force and can effectively complete the function of lithium extraction from salt lake brine.

The invention relates to the technical field of aluminum-based composite material preparation, in particular to a ceramic reinforced aluminum-based workpiece and a preparation method. The ceramic reinforced aluminum-based workpiece is prepared by the method. The method comprises the steps that a forming die is assembled and filled with aluminum-based composite powder; sintering the forming die filled with the aluminum-based composite powder in an inert atmosphere to obtain a sintered green body; performing die forging treatment on the sintered green body to obtain a prefabricated green body; and after the prefabricated blank is machined to the size of a finished product, the prefabricated blank is sequentially subjected to solution treatment and aging treatment, and the ceramic reinforced aluminum-based workpiece is obtained. By means of the method, the ceramic reinforced aluminum-based workpiece with the large length-diameter ratio can be prepared, and the problems that cracks are generated when a formed blank is not separated from the female die, and layering and fragmentation are generated in the demolding process are solved.

This invention provides a high-pressure compacted sodium iron pyrophosphate cathode material, its preparation method, and its application. The preparation method of the high-pressure compacted sodium iron pyrophosphate cathode material includes: weighing sodium, iron, and phosphorus sources according to the stoichiometric ratio of sodium iron pyrophosphate, adding carbon source and solvent, and mixing and grinding to obtain a precursor slurry; spray drying the precursor slurry to obtain precursor powder; compacting and granulating the precursor powder under a pressure of 10 MPa to 80 MPa to obtain denser precursor particles; and finally sintering at 500℃ to 650℃ for 6 to 15 hours under an inert atmosphere. This invention effectively eliminates internal cavities and interparticle gaps in the precursor through compaction and granulation, and controls the pressure within the range of 10 MPa to 80 MPa. The subsequent sintering process improves the density of the cathode material while controlling the impurity phase content to below 1 wt% and maintaining good electrochemical performance.

This invention discloses a tungsten-titanium cemented carbide and its manufacturing method, relating to the field of cemented carbide materials technology. Through specific raw material ratios and preparation processes, this invention achieves excellent properties such as a Rockwell hardness ≥81 HRA and fracture toughness ≥10 MPa・m¹ / ². This high hardness and good fracture toughness enable the alloy to exhibit better wear resistance and impact resistance when preparing various cemented carbide products, thereby extending the service life of the finished products and improving production efficiency. Simultaneously, its preparation method, through precise batching, wet grinding, drying granulation, molding, and low-pressure sintering steps, ensures the uniformity of the alloy composition and the compactness of the structure. In particular, the introduction of argon gas to pressurize to 1 MPa~6 MPa during low-pressure sintering effectively promotes densification during the sintering process, further enhancing the overall performance of the alloy. This optimized preparation process not only improves production efficiency but also reduces production costs, providing strong support for industrial production.

The application discloses a kind of nanometer silicon-based powder material surface modification material and preparation method and application, structure includes from inside to outside nanometer silicon, first silicon oxide layer, second silicon oxide layer, carbon coating layer or oxide coating layer, wherein the size of nanometer silicon is 30-200nm;Wherein the thickness of first silicon oxide layer is 2-4nm, oxygen content is 2-6wt%;Wherein the thickness of second silicon oxide layer is 1-3nm, oxygen content is 1-4wt%;Wherein the carbon content in carbon coating layer is 1-5wt%, the content of oxide in oxide coating layer is 0.1-1wt%.The application utilizes the diffusion and flow characteristics of supercritical carbon dioxide, modifies nanometer silicon-based material, can control superfine powder material surface structure by this modification method, and can realize nanometer silicon-based material surface uniform coating, improve the utilization ability of nanometer silicon-based material.

The application discloses a preparation method of an air absorption composite material with high adsorption capacity, belongs to the field of adsorption material preparation, and aims at solving the technical problem that the adsorption capacity and structural stability of the air absorption composite material in the prior art need to be further improved, and specifically comprises the following steps: stirring hybrid sol, epoxy-based silane grafted UiO-66 and modified polyether amine curing agent in a reaction kettle, heating the reaction kettle to 25-35 DEG C, and keeping the temperature and stirring for 30-60 min; and obtaining air absorption composite slurry through post-treatment; the hybrid sol, the epoxy-based silane grafted UiO-66 and the modified polyether amine curing agent are blended, then an organic-inorganic interpenetrating network is formed through epoxy-amine ring-opening addition curing, and the air absorption composite material with high adsorption capacity is obtained through segmented temperature rising activation.

The application discloses a kind of fire-retardant lignin-based formaldehyde-free adhesive and preparation method thereof, belong to adhesive preparation technical field, for solving in prior art, adhesive bonding strength and flame retardant performance need to be further improved technical problem;The present application is with lignin as main body, sequentially through triazine, phosphonate and nitrogenization modification, introduce nitrogen, phosphorus and polar group, prepare fire-retardant glue precursor, then combine catechol polyol and boric acid reaction generated borate polyol, and the hybrid prepolymer obtained by the action of amino POSS sol and glycerol carbonate, synergistic curing under the action of initiator, construct dense stable crosslinking network, the system has the environmental protection of lignin and the stability of organic-inorganic hybrid material, give adhesive high strength, excellent water resistance and flame retardant performance, and formaldehyde release is zero, suitable for green environmental protection field application.

The invention discloses a core-shell structure mineralizer modification-based photocuring 3D printing aluminum-based ceramic core and a preparation method thereof. The aluminum-based ceramic core comprises the following substances in percentage by weight: 65-75% of aluminum-based ceramic powder, 5-15% of a core-shell structure mineralizer component and 15-25% of a photosensitive resin component. The preparation method comprises the following steps: preparing aluminum-based ceramic core slurry, and vacuumizing the aluminum-based ceramic core slurry; injecting the aluminum-based ceramic core slurry into a trough of 3D printing equipment, and printing an aluminum-based ceramic core blank; the aluminum-based ceramic core green body is subjected to ultrasonic cleaning and drying treatment; and the aluminum-based ceramic core blank is subjected to degreasing treatment and sintering treatment, and the photocuring 3D printing aluminum-based ceramic core based on core-shell structure mineralizer modification is prepared. According to the method, the sintering temperature of the 3D printing aluminum-based ceramic core blank can be effectively adjusted, generation of interlayer cracks in the degreasing and sintering process is reduced, and the aluminum-based ceramic core with excellent comprehensive performance is obtained.

This invention belongs to the field of cemented carbide materials technology, and specifically relates to a high-entropy alloy binder phase gradient cemented carbide tool material and its preparation method. This invention uses a high-entropy alloy as a Co-binding phase in the cemented carbide, and introduces nano-ZrO. 2 To achieve phase transformation toughening, a graphene gradient (with decreasing content from the surface inwards) is introduced as a stable phase in the binder phase during liquid-phase sintering. Silicon carbide nanowires are introduced on the surface as a graphene dispersed phase, significantly improving the densification of WC materials. Carbon nanotubes are introduced in the transition layer as a graphene dispersed phase, coupling the atomic topological disorder of high-entropy alloys with the macro-micro ordered phase of the graphene gradient structure. The controllable distribution and preferred orientation of graphene are correlated with the gradient structure evolution of the high-entropy alloy binder phase cemented carbide. Through two-step liquid-phase + solid-phase sintering, a high-hardness, high-strength, high-toughness high-entropy alloy binder phase gradient cemented carbide tool material is obtained.

The application provides a well plate overturning device and a liquid automatic processing equipment with the same. The well plate overturning device comprises a fixed plate, a rotating shaft, a right-angle stop structure and a well plate clamping part. The fixed plate has a first side upward well plate taking and placing state and a first side downward well plate using state. The rotating shaft drives the fixed plate to rotate and switch between the well plate taking and placing state and the well plate using state. The well plate clamping part has a clamping end. During the switching of the fixed plate from the well plate taking and placing state to the well plate using state and when the fixed plate is in the well plate using state, the well plate clamping part can be driven to rotate so that the clamping end is close to a first corner of the well plate to form a diagonal clamping of the well plate together with the right-angle stop structure. When the fixed plate is in the well plate taking and placing state, the well plate clamping part can be driven to reversely rotate so that the clamping end is away from and separated from the first corner. The application synchronously realizes the clamping or unclamping of the well plate clamping part to the well plate during the overturning of the fixed plate, and the structure is simple and compact.

The application discloses a kind of high stability alkali erosion resistant low-grade bauxite-coal gangue based corundum-mullite system of preparation application technology of complex refractory material.Electrofusion magnesia is innovatively introduced into low-grade bauxite-based corundum-mullite system in the application, effectively improving the overall structural stability of the composite material, and a high-performance erosion-resistant composite material with a compressive strength of 89.88 MPa and a bulk density of 3.16 g / cm³ is obtained. And through the modification of zirconium silicate and yttrium oxide, the alkali erosion resistance of the composite material can be greatly improved, so that the material can adapt to the strong alkali working environment of sodium ion battery positive electrode material synthesis, and has excellent comprehensive performance. The application realizes the efficient utilization of low-grade bauxite and coal gangue resources, and the prepared composite material has structural stability and alkali erosion resistance, and can be widely used in high-performance kiln car, furnace lining, crucible and furnace lining, etc. Refractory scene, has good practical value and industrial application prospect.

This utility model discloses a bundled, high flame-retardant, low-smoke, halogen-free, unshielded Category 6 network cable, comprising a cross-shaped frame, twisted pairs, a flame-retardant and heat-insulating sheath, a flame-retardant filling layer, a protective outer jacket, and a thermally conductive layer. Several twisted pairs are twisted together around the side of the cross-shaped frame. The protective outer jacket is fitted over the outside of the flame-retardant filling layer. The thermally conductive layer is embedded within the flame-retardant filling layer. By embedding a tubular thermally conductive layer within the flame-retardant filling layer, when an external flame burns a portion of the network cable, the heat is transferred radially through the thermally conductive layer. This prevents the flame-retardant filling material in that area from being consumed too quickly during heat absorption and decomposition. Furthermore, the heated thermally conductive layer preheats the flame-retardant filling material in the vicinity of that area to its decomposition temperature, thus pre-decomposing, absorbing heat, and cooling it to form a continuous, dense, and stronger residual heat-insulating layer. This provides better flame retardancy and heat insulation, increasing the service life of the network cable in a fire.