397 results about "Composite ceramic" patented technology

The invention discloses a self-cleaning composite piezoelectric ceramic membrane as well as a preparation method and application thereof, and belongs to the field of composite ceramic membranes. The technical problem that an existing ceramic membrane separation technology is poor in biomembrane pollution resisting effect is solved. According to the preparation method, the barium titanate ceramic membrane is firstly prepared to serve as the base membrane, then the copper oxide one-dimensional nanostructure is loaded on the piezoelectric ceramic substrate, and the base membrane has a large membrane surface area and can be combined with more catalysts, so that more active sites are provided for catalytic reaction; according to the composite membrane, the hydrophilicity, the anti-pollution performance and the piezoelectric catalysis self-cleaning performance of the membrane are remarkably improved, and pollutants in water can be quickly and effectively separated, so that the flux and the anti-pollution performance of the membrane are improved.

The invention relates to a method for efficiently synthesizing a lithium difluoro bis (oxalate) phosphate solid in a continuous flow reactor, and belongs to the field of environmental protection. The method comprises the following steps: firstly, feeding a lithium hexafluorophosphate solution and a lithium oxalate solution into a static mixing module of a continuous flow reactor for mixing; then entering a reaction module of the continuous flow reactor for reaction; after the reaction is finished, the material enters a separation module of a continuous flow reactor, and after membrane separation, crude lithium difluorobisoxalato phosphate is obtained through a modified ceramic membrane adsorbent; washing the crude lithium difluoro-bis (oxalate) phosphate with absolute ethyl alcohol, and performing vacuum drying to obtain a lithium difluoro-bis (oxalate) phosphate solid; the modified ceramic membrane adsorbent is prepared from an aluminum oxide-zirconium oxide composite ceramic membrane, DMF (Dimethyl Formamide), water, isocyanate 1-trimethoxysilyl methyl ester, 3, 5-dihydroxyphenylboronic acid and stannous octoate. The lithium difluoro-bis (oxalate) phosphate prepared by the method is high in purity and high in yield, and meets the requirements of high-end lithium batteries.

The invention discloses a 3D printing photocuring forming method for a silicon nitride ceramic framework, and belongs to the technical field of advanced ceramic additive manufacturing. According to the 3D printing photocuring forming method for the silicon nitride ceramic framework, the silicon nitride framework containing a communicating hole array and a special-shaped supporting structure can be prepared through the DLP photocuring technology and customized slurry, the efficient infiltration requirement of a multiphase ceramic matrix is met, and the manufacturing efficiency is improved. The powder dispersity is improved through modification of a silane coupling agent, resin residues are thoroughly removed through cooperative control of a low-shrinkage resin system, segmented exposure, gradient degreasing and sintering, interface reaction with a complex-phase matrix at high temperature is avoided, stable complex-phase performance is guaranteed, layering does not exist after standing is conducted for 24 h through customized slurry, the process stability is extremely high, and the method is suitable for industrial production. Therefore, the problems of single skeleton structure, low dimensional precision and high impurity content in the prior art are solved, a complex three-dimensional pore structure can be prepared, the process stability is high, and the method is suitable for batch production and meets the requirements of multiple scenes such as high-temperature structural parts and multiphase ceramic reinforcement bodies.

The zirconium oxide ceramic modified by the graphene / zirconium oxide calcined composite microspheres is prepared from stable zirconium oxide powder A and the graphene / zirconium oxide calcined composite microspheres accounting for 25 wt% or below of the total ceramic powder through mixing, compression molding and sintering, the preparation method of the graphene / zirconium oxide calcined composite microspheres comprises the following steps: preparing stable zirconium oxide powder B, graphene and a solvent into slurry; and carrying out ball milling, spray drying and calcination to obtain the graphene / zirconium oxide calcined composite microspheres. According to the present invention, the graphene / zirconium oxide calcination composite microsphere and the SPS sintering are performed, such that the dispersed graphene / zirconium oxide two-phase structure region exists in the obtained zirconium oxide composite ceramic so as to consume the large amount of the crack growth energy, and the significant toughening effect is provided.

The application discloses a kind of high-temperature-resistant impact-resistant heat-absorbing heat-insulating composite ceramic brick and its preparation method and application, the ceramic composite brick includes heat-insulating layer and heat-absorbing layer;The main component of the heat-insulating layer is vacuum nanometer heat-insulating ceramic particles and alloy metal particles containing one or more of tungsten, cobalt, molybdenum or vanadium elements;The main component of the heat-absorbing layer is 3N grade and above high-purity alumina and black pigment;The components of the heat-insulating layer and the heat-absorbing layer are filled in the same mold in sections, and then are pressed to form a composite.The heat-insulating layer not only has excellent heat-insulating performance, but also has good toughness and impact resistance;The heat-absorbing layer can quickly absorb heat and accumulate heat, the temperature rising speed in the furnace is increased by more than 30%, the set temperature is quickly reached, the heat-insulating performance is increased by more than 2 times, and has good practical value and important energy-saving and environmental protection social value.

The invention discloses a three-dimensional graphene-carbon fiber network and double-phase high-entropy alloy synergistic strengthening and toughening ceramic cutter material as well as a preparation method and application thereof. The material is prepared from the following components in parts by mass: 87.8 to 90.9 parts of aluminum oxide, 8 to 10 parts of AlCoCrFeNi five-element equal-atomic-ratio high-entropy alloy, 1 to 2 parts of carbon fiber and 0.1 to 0.2 part of graphene. The preparation method comprises the steps of preparation of graphene grafted carbon fibers, preparation of AlCoCrFeNi high-entropy alloy powder, preparation of aluminum oxide-high-entropy alloy-graphene grafted carbon fiber composite ceramic powder and spark plasma sintering. The ceramic cutting tool material is used for preparing high-speed cutting tools. According to the preparation method, a plastic toughening mechanism of a double-phase high-entropy alloy is organically combined with a multi-stage toughening effect of a three-dimensional graphene-carbon fiber network, and a composite ceramic material with high hardness and high fracture toughness is obtained through spark plasma sintering, so that the adaptability of a cutter under a high-speed cutting condition is remarkably improved, and the service life of the cutter under the high-speed cutting condition is remarkably prolonged.

The invention relates to the technical field of fluid conveying equipment, in particular to a corrosion-resistant composite ceramic isolation sleeve for a magnetic drive pump, a preparation method and the magnetic drive pump. By adopting the specific compound proportion of the lithium oxide ceramic and the zirconium oxide ceramic, the magnetic drive pump isolation sleeve has excellent corrosion resistance and mechanical strength, is particularly suitable for conveying nitrogen tetroxide and other strong corrosive media, and remarkably improves the service life and the reliability of the magnetic drive pump isolation sleeve. The preparation method provided by the invention ensures that the material ratio is accurate, the structure is uniform, the performance is stable, and the method is suitable for large-scale production. The specific number of pairs of magnetic poles is adopted to be matched with the optimized isolation sleeve, so that the maximization of magnetic torque and the minimization of eddy-current loss are realized, and the transmission efficiency and the operation stability of the magnetic drive pump are integrally improved.

The application discloses a kind of preparation methods of multi-component photocuring composite ceramic, by adding tetraethyl orthosilicate in multi-component ceramic powder, obtain modified ceramic powder, then it is mixed with photosensitive resin prepolymer, dispersing agent, diluent, photo initiator uniformly, subsequently sequentially through DLP photocuring 3D printing, debinding, sintering after obtaining composite ceramic.The application utilizes the hydrolysis condensation characteristics of tetraethyl orthosilicate, makes it react on the surface of different ceramic powder, uniformly coats silica layer, can improve the phenomenon of curing uneven caused by the difference of refractive index, absorbance and reaction sensitivity of powder;The layer has low refractive index, can also solve the problem of insufficient curing depth of non-oxide ceramic.In addition, during sintering, the silica layer forms Y-Ce-Si-O ternary eutectic system with CeO2 and Y2O3, reduces the initial temperature of liquid phase, further promotes sintering densification, provides a feasible scheme for composite ceramic, high-entropy ceramic 3D printing.

The application discloses a filter core material and a preparation method thereof, and belongs to the technical field of water purification filter cores. The filter core material comprises the following components in percentage by mass: a honeycomb support matrix: 15-60%; a filter substrate: 30-40%; and a coating substrate: 0-50%. The filter core material and the preparation method thereof maintain a stable support structure during the preparation of a gamma-Al2O3 / BN composite ceramic layer through polypropylene and cellulose nanofiber. The filter substrate is obtained through gradient low-temperature sintering, effectively removes small particles and pollutants in water, and has excellent filtering performance. The active carbon fiber and polyether sulfone are coated on the filter substrate through electrospinning, which ensures good filtering performance and water permeability, improves the wear resistance and compressive strength of the filter core, and removes the honeycomb support matrix through high-temperature combustion, further improves the water permeability, and the active carbon fiber is physically activated during the combustion process, further improving the adsorption capacity.

The invention belongs to the field of new materials, and discloses B-site doped perovskite type composite wave-absorbing ceramic as well as a preparation method and application thereof. The main phase of the composite wave-absorbing ceramic is LaMnxFe1 / 2 (1-x) Co1 / 2 (1-x) O3, and Cu-Zn oxide is compounded. The composite wave-absorbing ceramic not only has an excellent wave-absorbing effect, but also meets the requirement of thin thickness of a ceramic material. According to the preparation method of some examples of the invention, a method of simultaneously completing perovskite synthesis and compounding through one-step sintering is adopted to replace a conventional method of respectively synthesizing perovskite powder and Cu-Zn oxide and then compounding, energy is saved, and the preparation cost is greatly reduced. The preparation method is simple to operate, adopts a step-by-step reaction sintering method, ensures smooth synthesis of LaMnxFe1 / 2 (1-x) Co1 / 2 (1-x) O3, realizes densification of the composite ceramic, and can prepare the high-quality LaMnxFe1 / 2 (1-x) Co1 / 2 (1-x) O3 perovskite type Cu-Zn oxide composite ceramic.

The invention aims to provide an insulating composite ceramic coating with high impact resistance and a preparation method of the insulating composite ceramic coating. The coating is based on nano-agglomerated AlO-3 wt.% TiO composite powder; a double-stage atmospheric plasma spraying process is adopted to directly prepare on a stainless steel substrate under the condition that a metal bonding layer is not prepared in advance: in the first stage, a strong bonding bottom layer is formed at relatively high power, and in the second stage, a nano-structure working layer is constructed at optimized power. In addition, a functional additive accounting for 0.5-3% of the total mass of the powder is externally doped to carry out laser remelting treatment on the coating so as to further densify the coating. Through component compounding and process gradient design, the contradiction that high insulativity and high toughness of the coating are difficult to consider at the same time is successfully solved, and the prepared coating has high hardness, high fracture toughness, high bonding strength and excellent impact resistance and insulation performance; and a long-acting and reliable solution is provided for galvanic corrosion protection of dissimilar metal connecting parts in the marine environment.

The invention discloses a wear-resistant B4C-SiC composite coating and a laser preparation method thereof, and belongs to the technical field of composite materials and coating preparation. The wear-resistant B4C-SiC composite coating is prepared by carrying out laser cladding on Si-B4C-SiC composite powder; the Si-B4C-SiC composite powder is prepared from composite ceramic powder by adopting a ball-milling turbid liquid and then adopting a spray granulation method; the composite ceramic powder is prepared from the following components in percentage by mass: 50 to 52 percent of B4C powder, 40 to 43 percent of SiC powder and 5 to 10 percent of Si powder. The method disclosed by the invention comprises the following steps: mixing B4C powder, SiC powder and Si powder with a PVA solution, deionized water and absolute ethyl alcohol, carrying out ball-milling granulation to obtain a composite ceramic powder cladding raw material, and preparing the B4C-SiC composite coating by utilizing a laser cladding method. The prepared B4C-SiC composite ceramic coating has high toughness and hardness, the wear resistance of a base material can be greatly improved, rapid preparation of the wear-resistant coating of the base material in a complex shape is met, and the B4C-SiC composite ceramic coating has remarkable application prospects in the fields of aerospace, automobile manufacturing and the like.

The application discloses a high-hardness high-strength low-temperature sintering composite ceramic material and a preparation method thereof, and comprises the following raw materials in parts by weight: active silicon-aluminum composite material 35-45 parts, modified manganese-silicon slag 20-25 parts, alpha-alumina micro powder 10-15 parts, sodium feldspar 12-18 parts, wollastonite 8-12 parts, low-temperature composite flux 10-15 parts and water 80-100 parts. The high-hardness high-strength low-temperature sintering composite ceramic material takes the active silicon-aluminum composite material as the raw material, introduces multiple solid waste derived components such as the modified manganese-silicon slag and the low-temperature composite flux in the formula, the components complement each other and have a synergistic effect in the sintering process, so that the ceramic material has high hardness and high bending strength, and the unification of solid waste reduction, resource utilization and ceramic performance improvement is realized.

A composite ceramic substrate and method for producing the same. The composite ceramic substrate includes a ceramic substrate, a circuit board, and a composite adhered structure adhered to the ceramic substrate and the circuit board. The composite adhered structure includes a first active metal layer adhered to the ceramic substrate, a second active metal layer adhered to the circuit board, and a solder layer arranged between the first active metal layer and the second active metal layer. The first active metal layer includes titanium hydride. The second active metal layer includes tin, copper, and titanium hydride. The solder layer includes tin, copper, and titanium hydride.

The utility model provides a ceramic heating device which comprises a ceramic heating body, the ceramic heating body comprises an upper ceramic chip, a heating resistor, a lower ceramic chip and a lead, the heating resistor is located between the upper ceramic chip and the lower ceramic chip, the lead is electrically connected with the heating resistor, and the heating resistor is electrically connected with the lead. The ceramic heating plate is characterized by further comprising a nano-composite ceramic coating layer, the surface of the ceramic heating body is covered by the nano-composite ceramic coating layer, one end of the lead is fixedly arranged between the upper ceramic plate and the lower ceramic plate, and the other end of the lead penetrates through the nano-composite ceramic coating layer and is led out. The technical scheme of the utility model has the beneficial effects or advantages that the nano-composite ceramic coating is sprayed on the surface of the ceramic heating body through the spray gun, and is dried and cooled to form a coating layer, so that the insulating property, the heat dissipation property and the surface uniformity are good.

The application relates to the technical field of ceramic materials, in particular to a boron carbide composite ceramic material and a preparation method and an etching component thereof. The preparation method comprises the following steps: forming granular materials containing boron carbide, titanium boride and silicon carbide, the granular materials have a spherical structure, the mass proportion of the boron carbide in the granular materials is 70%-90%, the mass proportion of the titanium boride is 5%-25%, and the mass proportion of the silicon carbide is 5%-25%; and the granular materials are sequentially subjected to pre-sintering and hot-press sintering to prepare the boron carbide composite ceramic material; wherein the temperature of the pre-sintering is 1200 DEG C-1500 DEG C. The application can promote the three-dimensional communication growth of sintering necks in the hot-press sintering process, effectively improve the material density, ensure the good uniformity of the material, and synergistically improve the etching resistance of the boron carbide ceramic material.

The invention discloses a four-phase composite ceramic heating element and a preparation method thereof, and relates to the technical field of ceramic heating materials, the composite ceramic heating element comprises the following components: 30%-40% of titanium diboride, 30%-40% of titanium carbide, 10%-28% of silicon carbide, 1%-12% of hexagonal boron nitride, 0.5%-3% of nano zirconium dioxide and 1%-4% of silicon nitride. A four-phase composite system of TiB2 (titanium diboride), TiC (titanium carbide), SiC (silicon carbide) and hBN (hexagonal boron nitride) is constructed, basic expansion reduction is achieved through the low expansion characteristic of SiC, thermal expansion mismatching stress between different phases is dispersed in combination with the interface regulation and control effect of an h-BN layered structure, compared with an existing ternary system, the minimum thermal expansion coefficient is reduced to 5.8 * 10 <-6 > K <-1 >, and the thermal expansion coefficient is reduced to 5.8 * 10 <-6 > K <-1 >. And the interfacial compatibility is remarkably improved, and thermal stress is prevented from being gathered at the interface.

The graphene / zirconia sintered composite microsphere modified zirconia ceramic is prepared by mixing, pressing and sintering stable zirconia powder A and graphene / zirconia sintered composite microspheres accounting for less than 25wt% of the total ceramic powder; the preparation method of the graphene / zirconia sintered composite microspheres is that stable zirconia powder B, graphene and a solvent are matched into a slurry; the graphene / zirconia sintered composite microspheres are obtained through ball milling, spray drying and calcination. The graphene / zirconia sintered composite microspheres and SPS sintering are used in the application, the obtained zirconia composite ceramic has dispersed graphene / zirconia two-phase structure regions in the interior, can consume a large amount of energy of crack propagation, and has a significant toughening effect.

The invention relates to the technical field of coatings, in particular to an MOFs enhanced nano ceramic coating material, a preparation method and application of the MOFs enhanced nano ceramic coating material to a heat insulation film. The preparation method comprises the following steps: firstly, coating the surface of Al2O3 / ZrO2 nano composite ceramic with ZIF-8 through an in-situ growth method to form MOFs enhanced nano ceramic composite powder with a core-shell structure; performing amino modification by using an amino silane coupling agent, and grafting polyacrylic acid by using an amidation reaction catalyzed by DCC / DMAP (dicyclohexylcarbodiimide / dimethylaminopyridine), so as to obtain surface carboxylated modified nano ceramic composite powder; and finally, mixing and dispersing the modified powder with organic silicon resin containing hydroxyl functional groups, a polyvinylpyrrolidone dispersing agent, a polyether modified polydimethylsiloxane flatting agent, a polyoxyethylene polyoxypropylene glycerol ether defoaming agent and ethanol to obtain the MOFs enhanced nano ceramic coating material. The coating has low thermal conductivity and high mechanical strength, and the powder has good dispersion stability in the coating, so that the coating can be widely applied to the field of heat-insulating films.

The invention relates to the field of surface protective coatings, in particular to a wear-resistant self-lubricating coating and a preparation method thereof.The wear-resistant self-lubricating coating is of a gradient composite structure composed of a matrix binding layer, a transition wear-resistant layer and a surface lubricating layer, the matrix binding layer is Ni-Co alloy doped with TiC nano-particles, and the transition wear-resistant layer is a Ni-Co alloy doped with TiC nano-particles. The transition wear-resistant layer is CrC-AlO composite ceramic doped with WSlubricating particles, a tough nano-composite bonding layer is prepared through magnetron sputtering on the basis of combination of matrix pretreatment optimization, the high-hardness wear-resistant ceramic middle layer is constructed through plasma spraying, and the wear-resistant ceramic middle layer is prepared through plasma spraying. Then an intelligent surface layer with an instant-reserve dual-mode lubricating function is elaborately laid through a low-temperature plasma spraying technology, and finally the coating structure is stabilized through post-treatment; the gradient design is combined with precise manufacturing, so that the coating has excellent adhesive force, extremely high wear resistance, ultralow friction coefficient and unique long-acting self-lubricating capacity at the same time, and long-acting reliable protection under severe working conditions is realized.

The invention discloses an infiltration sintering process of a ceramic skeleton reinforced silicon nitride composite ceramic, and belongs to the technical field of ceramic processing, communicated pores are reserved by pre-sintering a skeleton, a guarantee is provided for full filling of silicon nitride-based slurry, silicon powder added in the slurry is subjected to an in-situ chemical reaction with the surface of the skeleton in an integrated sintering process, and the surface of the skeleton is subjected to an in-situ chemical reaction; a stable transition phase is formed, so that the interface bonding is enhanced; the porosity, the pore size, the boundary dimension and the internal structure can be accurately regulated and controlled through 3D printing of the prefabricated framework, vacuum-pressure infiltration ensures that the slurry can uniformly and fully fill the pores of the framework, the problem of insufficient local infiltration is avoided, framework pre-sintering and matrix sintering are combined into one procedure through integrated sintering, the secondary processing step is reduced, and the production efficiency is improved. The defect generation probability caused by secondary sintering is reduced, the technological process is simplified, the controllability is high, the method is suitable for industrial batch production, the production cost is reduced, and the production efficiency is improved.

This invention relates to the field of heat exchange materials technology, and discloses a high-temperature, high-pressure nano-conductivity heat exchange material. The heat exchange material comprises a metal matrix, a linearly distributed metal-ceramic gradient transition layer, and a nano-composite ceramic surface layer. The surface layer consists of 90-95 parts of nano-alumina and zirconium oxide composite powder and 5-10 parts of cubic phase nano-titanium nitride powder. The former is fused and stacked to form a continuous ceramic matrix, while the latter is monodispersed and anchored within it, with adjacent particles in contact. The heat exchange material is prepared by gradient layer spraying with a linearly decreasing plasma current as the ceramic composition increases, followed by back-side cooling of the matrix. The surface layer is sprayed using a coaxial air knife in a reducing atmosphere combined with a low-enthalpy jet to inhibit oxidation and vacuum diffusion annealing. This invention synergistically regulates the above-mentioned structure and interface state to achieve a balance between high thermal conductivity, excellent corrosion resistance, and high bonding strength, which helps extend the service life of heat exchange components under high-temperature and high-pressure environments.

The invention relates to the technical field of lithium ion batteries, and discloses a composite diaphragm with a coating layer constructed by rodlike titanium dioxide and a preparation method of the composite diaphragm. The composite diaphragm comprises a base membrane and a composite ceramic coating coated on at least one surface of the base membrane, the composite ceramic coating is formed by coating slurry containing boehmite, modified rod-like titanium dioxide and a binder; wherein the modified rodlike titanium dioxide is rodlike titanium dioxide of which at least the surface contains oxygen vacancies. The rod-like titanium dioxide with specific morphology is directly introduced to be dispersed and bonded with boehmite to form the composite ceramic coating, so that a stable irregular porous structure is formed in the composite ceramic coating, and the irregularity is beneficial to keeping an electrolyte in the diaphragm coating and promoting ion migration; oxygen vacancies are introduced into at least the surface of the rod-shaped titanium dioxide, so that richer pore channels are formed, ion migration is further promoted, and the electrolyte preservation amount of the diaphragm can be further promoted.

The invention relates to the technical field of metal product preparation, and discloses a manufacturing process of a high-strength wear-resistant alloy cast iron pan, which comprises the following steps: respectively carrying out magnetic separation impurity removal on a basic raw material and titanium powder, then carrying out vacuum roasting, cooling and discharging to respectively obtain pre-treated pig iron, pre-treated carbon steel and pre-treated titanium powder; preheating an induction furnace, adding the pretreated pig iron, and raising the furnace temperature until the pretreated pig iron is completely molten; then adding the pretreated carbon steel and the reinforced alloy, starting electromagnetic stirring, then adding the pretreated titanium powder, and continuously stirring after adding to obtain a melt; a composite inoculant is added into the melt and stirred, then molten iron is poured into a heat preservation launder for pouring, demolding is conducted after heat preservation, and a pot blank is obtained; the pot bottom and the pot body of the pot blank are subjected to partitioned cooling, then overall cooling and vibration aging treatment are conducted, and then natural cooling is conducted to the room temperature; and after the cooled pan blank is ground and polished, the pan blank is coated with a composite ceramic coating, and the high-strength wear-resistant alloy cast iron pan is obtained.

The invention relates to a high-safety negative-electrode-free lithium battery and a preparation method and application thereof, in particular to a high-safety negative-electrode-free lithium battery which comprises a positive pole piece, a negative pole piece, a diaphragm and an electrolyte, the structure comprises a current collector and at least two positive electrode active material layers with different electrochemical potentials, wherein the positive electrode active material layers are sequentially coated on the current collector, so that a potential gradient from the current collector to the outside is formed; and / or the diaphragm is a composite ceramic diaphragm, and at least comprises a composite ceramic layer coated with AlO-coated BN on the surface; and / or the negative pole piece has a multi-layer coating structure, and the structure comprises a current collector and at least two negative active material layers with different reaction activities, and the negative active material layers are sequentially coated on the current collector. According to the invention, through multi-scale cooperation of the material and the interface, internal safety of the negative-electrode-free high-energy-density battery cell is realized from three dimensions of heat, electricity and force.

The application discloses a kind of metal composite ceramic powder material preparation's supervision system, it is related to material preparation supervision technical field, including: potential source set generation module, for according to the actual inhalation nanodose of worker, superfine powder volume fraction and actual sintering density measured value generation potential source set;Potential intensity generation module is used for respectively to inhalation nanodose and sintering density measured value carry out power law mapping, obtain exposure layer potential intensity and density layer potential intensity;Potential field generation module is used for respectively to exposure layer potential intensity and density layer potential intensity carry out weighting aggregation operation, obtain the exposure layer potential field and density layer potential field under the proportion of measured batching;Predicted value generation module is used for respectively according to exposure layer potential field and density layer potential field generation at the proportion of measured batching predicted inhalation nanodose and predicted sintering density.The application solves the shortcoming that density improvement and exposure limit value conflict need artificial trade-off.

The application discloses an antioxidant composite ceramic aerogel and a preparation method thereof, and belongs to the technical field of composite ceramic aerogels.The main body of the antioxidant composite ceramic aerogel is a silicon nitride aerogel, the nanostructure of the silicon nitride aerogel is one of one-dimensional silicon nitride nanowires and two-dimensional silicon nitride nanobands or a combination of the two nanostructures, and a mullite coating and a copper-nickel metal coating are sequentially coated on the nanostructure of the silicon nitride aerogel from inside to outside.The application can solve the technical problem that the prior art cannot prepare silicon nitride ceramic aerogels which can stably serve in a high-temperature oxygen environment at low cost and in batches.

The application relates to the technical field of high polymer composite materials, and discloses a light-weight heat-conducting engineering plastic and a preparation method thereof, which is prepared through melt blending of a polyamide resin matrix, boron-nitrogen alkane-polydimethylsiloxane hybrid polymer and a heat-conducting filler composed of a core-shell structure of graphene-liquid metal and composite ceramic microspheres with in-situ grown aluminum oxide nanowires on the surface. First, an interface compatibilizer is synthesized through nucleophilic substitution polycondensation; then, the core-shell structure filler is prepared through a mechanical chemical method, and the nanowires are in-situ grown on the surface of the microspheres through polydopamine biomimetic modification and a hydrothermal-calcination method to construct a three-dimensional heat-conducting network; finally, the light-weight heat-conducting engineering plastic is obtained through melt blending, uniform dispersion and strong interface combination of all components are realized, the engineering plastic with the characteristics of high heat-conducting coefficient, high notched impact strength and low density is obtained, and an innovative material solution is provided for fields with strict requirements on light weight and heat conduction.

This invention discloses a high-temperature resistant, heat-insulating, ceramizable fire-resistant sealing adhesive and its preparation method. The fire-resistant sealing adhesive comprises the following raw materials: base adhesive, dimethyl silicone oil, flame retardant, composite ceramic powder, additive filler, flux, silane coupling agent, crosslinking agent, functional filler, and catalyst. The functional filler is composed of fumed silica, high-temperature resistant aerogel powder, and silicon carbide powder, with a mass ratio of 40-50:20-30:20-30. Through the specific selection of multi-stage filler compounding, this invention achieves a balance between room-temperature performance and the high-temperature ceramization process that is unattainable in existing technologies. Its flame retardant rating can reach V0, its fire resistance limit is greater than 4.5 hours, and during the burning process, the highest temperature on the unexposed surface does not exceed 110°C.