1179 results about "Composite ceramic" patented technology

The invention discloses a carbon composite ceramic linear resistor and a preparation method thereof, and belongs to the technical field of power electronic components. The invention provides a preparation method of a carbon composite ceramic linear resistor, which comprises the following steps: uniformly mixing bentonite, silicon carbide and nano carbon black to obtain powder, uniformly mixing the powder and ethanol, drying, adding a binder solution, and carrying out green body forming to obtain a green body; carrying out heat preservation on the green body at 1150-1300 DEG C in a nitrogen-containing gas atmosphere to obtain a sample; and polishing the sample, and spraying aluminum to obtain the carbon composite ceramic linear resistor. According to the method for preparing the carbon composite ceramic linear resistor, the resistivity of the material can be reduced, and the thermal shock resistance of the ceramic resistor can be improved.

The preparation method comprises the following steps: brushing ultrahigh-temperature ceramic oxide slurry on the surface of a graphite base material, carrying out first heat treatment to obtain a porous transition layer, then brushing ultrahigh-temperature carbide slurry on the surface of the porous transition layer, and carrying out second heat treatment to obtain the high-temperature-stable and corrosion-resistant multi-layer composite ceramic coating on the surface of the graphite base material. The preparation method comprises the following steps: performing primary heat treatment on the surface of an ultra-high-temperature carbide layer, drying to obtain the ultra-high-temperature carbide layer, performing roughening treatment on the surface of the ultra-high-temperature carbide layer by adopting ultra-high-temperature carbide slurry, performing secondary heat treatment to obtain a rough carbide layer, and performing point pressure on the surface of the rough carbide layer by adopting metal carbide ceramic mixed slurry to obtain dense bulges; according to the method disclosed by the invention, not only can the bonding firmness among the layers be remarkably improved, but also the situation that the graphite base material and the surface protection layer react at high temperature, so that the coating fails and falls off is effectively avoided, the use limit of the protection layer is further enhanced, and the method has a wide application prospect.

The invention discloses a tungsten alloy material containing a silicon carbide reinforced Al2O3-SiO2-based multiphase ceramic coating and a preparation method of the tungsten alloy material, and belongs to the field of ceramic material preparation. The method comprises the following steps: ball-milling and mixing powder raw materials containing modified silicon carbide, aluminum oxide, silicon dioxide and lead oxide with a solvent, and defoaming to obtain ceramic slurry; the ceramic slurry is brushed on the surface of a tungsten alloy matrix subjected to surface pretreatment, and after drying, vacuum sintering is performed to obtain the tungsten alloy. The compact silicon carbide reinforced Al2O3-SiO2-based multiphase ceramic coating is introduced to the surface of a tungsten alloy matrix, the hardness, the high-temperature oxidation resistance and the high-temperature carburization resistance of a tungsten alloy material are remarkably improved, the stability of the coating can be improved through the silicon carbide distributed in a dispersed point shape, the thermal expansion coefficient of the coating is evenly reduced, and the hardness, the high-temperature oxidation resistance and the high-temperature carburization resistance of the tungsten alloy material are improved. The thermal expansion coefficient difference value between the multiphase ceramic coating and a tungsten alloy matrix is reduced, and the thermal shock resistance of the coating is improved.

The invention relates to the field of ceramic materials, in particular to a high-temperature-resistant composite ceramic material and a preparation method thereof.The high-temperature-resistant composite ceramic material is prepared from, by weight, 80-100 parts of zirconium oxide, 10-20 parts of silicon carbide, 5-10 parts of aluminum nitride, 1-5 parts of a sintering aid and 5-10 parts of modified silicon powder; the modified silicon powder takes nano silicon powder as a core body, the core body is sequentially coated with a transition metal organic polymer and oxidized asphalt, and the prepared composite ceramic material is good in mechanical strength and excellent in high temperature resistance and has important application value in the field of aerospace.

The invention relates to the technical field of high-entropy ceramic preparation, and particularly discloses (TiZrNbHfTaV) C-SiC high-entropy composite ceramic as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing the (TiZrNbHfTaV) C-SiC high-entropy composite ceramic consisting of double phases of (TiZrNbHfTaV) C and SiC by adopting a rapid hot pressed sintering technology. The preparation process is simple and efficient, and large-scale industrial application is facilitated; the prepared multiphase ceramic is high in density, uniform in organization structure and reasonable in component design, the multiphase ceramic shows excellent mechanical properties, and the hardness, the fracture toughness and the wear rate are 34.00 GPa, 6.4 MPa.m < 1 / 2 > and 1.8 * 10 <-6 > mm < 3 > N <-1 > m <-1 > respectively. Compared with the traditional binary carbide ceramic, the (TiZrNbHfTaV) C-SiC high-entropy composite ceramic disclosed by the invention has excellent hardness and toughness, and the friction and wear properties are remarkably improved.

The invention discloses a vacuum high-wear-resistance zirconia-based composite ceramic material as well as a preparation method and application thereof, and belongs to the technical field of ceramic material preparation. The preparation method comprises the following steps: 1) sufficiently and uniformly mixing zirconium oxide powder, a stabilizer and absolute ethyl alcohol to prepare mixed slurry; 2) adding whiskers into the mixed slurry, fully and uniformly stirring, and then drying and sieving to obtain mixed powder; 3) carrying out static pressure molding on the mixed powder to prepare a composite ceramic biscuit, and then carrying out vacuum sintering and annealing treatment to prepare composite ceramic; and 4) performing high-temperature carburizing treatment on the composite ceramic to obtain carburized composite ceramic, and performing surface treatment to obtain the vacuum high-wear-resistance zirconia-based composite ceramic material. The vacuum wear rate of the zirconia-based composite ceramic material provided by the invention is reduced by 1-2 orders of magnitude compared with that of a traditional yttria-stabilized zirconia material, and a novel high-wear-resistance ceramic material is provided for precise friction driving parts in the field of aerospace.

The invention discloses a laminated high-reliability high-power connection terminal and a manufacturing method thereof, and the method comprises the steps: providing composite ceramic as a substrate layer, carrying out the active treatment, depositing a layer of metal film on the substrate layer to form a first current transmission layer, coating a photosensitive material layer, defining a geometric figure of a multi-layer structure, and carrying out the selective etching. Forming a micro-nano channel structure; a heat dissipation material is deposited between the formed first current transmission layer and the heat dissipation channel, the deposition process is repeated, and a multi-layer stacked structure is constructed step by step; a self-healing polymer material is applied to the junction of the current transmission layer and the heat dissipation layer of the adjacent level to be solidified at the key connection node; and packaging the plurality of insulation protection layers by adopting a hot press molding process to obtain the laminated high-reliability high-power connection terminal. Through the application of a multi-layer stacked structure and advanced materials, the transmission efficiency and the thermal management capability are remarkably improved, and the requirements of high performance and high reliability of the connection terminal in a high-power application scene are met.

The invention relates to multi-element rare earth silicate / silica carbon nano composite ceramic and a preparation method thereof. The composition general formula of the nano composite ceramic is (YbaHobErcLudTmeGdfTbgYhLaiScj) 2SixO2x + 3 / SiOC, a + b + c + d + e + f + g + h + i + j = 1, at least two of a, b, c, d, e, f, g, h, i and j are not 0 at the same time, and x = 1 or 2. The preparation method comprises the following steps: reacting a rare earth metal element complex with a silicon-based polymer to obtain a single-source precursor; the single-source precursor is obtained through cross-linking and high-temperature heat treatment, or the single-source precursor is subjected to cross-linking and pyrolysis to obtain ceramic powder, and the ceramic powder is further sintered at high temperature to obtain a ceramic block. The preparation method is simple, reliable, short in period and low in cost, and the water and oxygen corrosion resistance of the material can be effectively improved.

The invention relates to the technical field of surface engineering, discloses a method and a system for preparing a yttrium fluoride composite ceramic coating through atmospheric plasma spraying, and aims to solve the problems that the yttrium fluoride coating generates a brittle aluminum fluoride layer on the surface of an aluminum substrate due to fluorine ion diffusion, so that the bonding strength is low, and the yttrium fluoride coating is easy to peel off and lose efficacy. The method comprises the following steps: sequentially carrying out mechanical polishing, ultrasonic cleaning and sand blasting roughening on an aluminum base material; preparing composite powder formed by mixing yttrium fluoride, yttrium oxide and nanometer aluminum oxide according to the mass ratio of 75: 20: 5; sequentially depositing a yttrium oxide transition layer, a composite barrier layer and a yttrium fluoride functional layer by adopting atmospheric plasma spraying; and finally carrying out vacuum post-heat treatment. According to the system, through the synergistic effect of the three layers of gradient structures, the transition layer forms an yttrium aluminate metallurgical bonding interface, the barrier layer inhibits fluorine ion diffusion through the dual mechanisms of nanometer aluminum oxide physical barrier and yttrium oxide chemical adsorption, and the functional layer guarantees the plasma erosion resistance. According to the method, the bonding strength of the coating is remarkably improved to 50 MPa or above, the porosity is lower than 3%, stripping is avoided under 500-hour high-energy plasma bombardment, the process cost is reduced by 40%, and the method is suitable for cavity protection of semiconductor etching equipment.

The invention discloses an NZP-high-entropy (Ln1 / n) PO4 monazite type multiphase ceramic solidified body and a preparation method thereof, the chemical general formula of the NZP-high-entropy (Ln1 / n) PO4 monazite type multiphase ceramic solidified body is (1-x) Sr0. 5Zr2 (PO4) 3-x (Ln1 / n) PO4, x represents molar percentage, the value range is 0.1-0.9, x represents molar percentage, and the value range is 0.1-0.9. The NZP-high-entropy (Ln1 / n) PO4 monazite type multiphase ceramic solidified body is NZP-high-entropy (Ln1 / n) PO4 monazite type multiphase ceramic solidified body. N represents the number of element types of Ln lattice sites in the high-entropy (Ln1 / n) PO4 monazite type, and n is an integer and is larger than or equal to 5 and smaller than or equal to 7; the Ln element types comprise La, Nd, Sm, Eu, Gd, Ho, Er, Sr0. 5Zr2 (PO4) 3 and (Ln1 / n) PO4, and the molar ratio of the Ln element types to the Sr0. 5Zr2 (PO4) 3 to the (Ln1 / n) PO4 can be freely regulated and controlled. The NZP-high-entropy (Ln1 / n) PO4 monazite type multiphase ceramic solidified body adopts an in-situ preparation process, and integration of crystal phase synthesis and sintering densification can be realized. The preparation method comprises the following steps: uniformly mixing the raw materials, pretreating, adding a sintering aid, mixing again, granulating and aging the obtained powder, molding, removing plastic, and sintering to obtain the NZP-high-entropy (Ln1 / n) PO4 monazite type composite ceramic solidified body. The preparation process disclosed by the invention has the advantages of flexible composition design, capability of simultaneously curing various fission products and (sub) actinide series nuclides, short preparation period, low production energy consumption, high product compactness and the like.

The invention relates to a diffusion-resistant layer enhanced high-temperature oxidation-resistant composite ceramic coating for a niobium surface and a preparation process thereof. The coating system is composed of a diffusion layer, an anti-diffusion layer and a composite ceramic coating in sequence. In the preparation process, the Al2O3 diffusion-resistant layer is accurately constructed by adopting a slurry spin-coating method, and the method can realize accurate regulation and control of the thickness of the diffusion-resistant layer, so that uniform distribution of the Al2O3 layer is ensured. The introduction of the diffusion-resistant layer significantly improves the high-temperature stability and oxidation resistance of the coating, effectively delays the oxidation process of the material under an extreme high-temperature condition, and greatly prolongs the service life of the material.

The invention discloses yttrium oxide-aluminum oxide transition layer composite ceramic and a preparation method and application thereof.The preparation method comprises the steps that quantitative aluminum oxide powder, transition mixed powder and yttrium oxide powder are sequentially laid in a forming mold of a cold isostatic pressing machine from bottom to top, and then the powder raw materials in the forming mold are evenly pressurized through the cold isostatic pressing technology; a formed ceramic green body is obtained; the formed ceramic green body is machined into a designed shape and then sintered, the composite ceramic with the aluminum oxide part as an aluminum oxide base material, the transition mixed powder as a transition layer and the yttrium oxide part as a coating is obtained, the transition layer can reduce a gap of a bonding interface of yttrium oxide and aluminum oxide, and the interface is seamlessly connected and is more compact; in addition, aluminum oxide particles and yttrium oxide powder particles in the transition layer are uniformly mixed and embedded with each other, so that the mechanical locking between materials is obviously improved, and the binding force is stronger; the problems that in the prior art, an yttrium oxide etching-resistant protective coating is poor in binding force and prone to peeling off are solved.

The invention relates to the technical field of bulletproof plugboards, in particular to a composite bulletproof plugboard and a preparation method thereof. The composite bulletproof flashboard comprises a crack arrest layer, a composite ceramic layer, a buffer layer, a tough layer and an outer packing material which are arranged in a stacked mode. All the layers are bonded by adopting polyethylene adhesive films. The overall density of the composite bulletproof flashboard does not exceed 38.9 kg / m < 2 >, the composite bulletproof flashboard is light in weight, after a shooting experiment is conducted, the sunken degree of the back of the composite bulletproof flashboard does not exceed 18.4 mm, most importantly, the composite bulletproof flashboard still has good protection performance after multiple times of dense shooting and shooting again, and soldiers can be effectively protected and casualties can be effectively reduced in actual combats.

The invention provides a plasma spraying high-temperature-erosion-resistant coating and a coating preparation method, and relates to the technical field of material surface treatment. Comprising the following components in parts by mass: 30-45 parts of tungsten carbide, 15-25 parts of chromium carbide-nickel-chromium alloy, 15-25 parts of yttria-stabilized zirconia, 5-10 parts of aluminum oxide-titanium dioxide composite ceramic, 10-20 parts of nickel-chromium-aluminum-yttrium alloy, 1-3 parts of nano aluminum oxide and 1-3 parts of lanthanum oxide. Multiphase collaborative design is adopted, tungsten carbide and chromium carbide-nickel-chromium alloy form double hard phases, the hardness is higher, aluminum oxide-titanium dioxide composite ceramic fills pores and improves compactness, rare earth and nanometer are adopted to cooperate, lanthanum oxide and nanometer aluminum oxide react to generate a LaAlO3 protective layer, oxidation weight gain is small, oxygen diffusion is inhibited, nanometer aluminum oxide refines grains, and the hardness is higher. In conclusion, the high-temperature oxidation resistance is high, and the erosion rate is low.

The invention relates to the technical field of metal material coatings, in particular to a PVD composite coating and a preparation method thereof. The preparation method comprises the following steps: pretreating a metal matrix to obtain a pretreated matrix; carrying out magnetron sputtering deposition on the surface of the pretreated matrix by using a composite target material, carrying out plasma spraying and laser texturing for multiple times, and repeating the process to form a composite coating crude product containing a third rare earth doped high-entropy alloy coating; the composite coating crude product is subjected to post-treatment, and the composite coating is obtained; wherein the composite target material is AlCoCrFeNi-Y, and the composite oxide comprises aluminum oxide, titanium oxide and cerium oxide. According to the preparation method, the bonding strength, hardness and strength of the composite coating can be remarkably improved through magnetron sputtering deposition of the rare earth doped high-entropy alloy coating, plasma spraying formation of the composite ceramic coating with the gradient content, laser texturing treatment, alternate construction of multiple layers of coatings and the like in combination with elaborately selected materials with low expansion coefficients.

The invention provides a preparation method of pressureless sintered boron nitride composite ceramic, and relates to the technical field of ceramic composite material preparation. The method comprises the following steps: carrying out surface modification on boron nitride whiskers by using ethanolamine, and activating hexagonal boron nitride powder in a ball milling tank by using an alkaline solution; the preparation method comprises the following steps: uniformly mixing the boron nitride powder and the boron nitride powder in a mixing tank, carrying out cold isostatic pressing to obtain a cold-pressed green body, and carrying out high-temperature calcination on the cold-pressed green body in an inert atmosphere to finally obtain the boron nitride composite ceramic. According to the invention, the physical property characteristics of the boron nitride whisker are fully utilized, and the boron nitride whisker can be fully combined with the hexagonal boron nitride powder subjected to surface activation during calcination through further chemical surface modification, so that relatively high mechanical strength can be realized only by using one phase of boron nitride on the premise of not introducing other sintering aids; the method has the characteristics of high product purity, low production cost and high mechanical strength.

The invention provides a diaphragm and a preparation method thereof, and a lithium ion battery, the diaphragm comprises a base membrane, a composite ceramic coating and an interface layer, the composite ceramic coating contains inorganic ceramic particles and organic microcapsule particles, the organic microcapsule particles comprise a core material with a melting point range of 55-65 DEG C and a polymer shell coating the surface of the core material, and the polymer shell is coated on the surface of the core material. The polymer shell is selected from at least one of polyurethane, polyurea, polyamide and polycarbonate, the interface layer is formed by depositing an interface modification polymer on the surface of the composite ceramic coating, and the interface modification polymer is selected from at least one of polycatechol derivatives, polyaniline, polyvinyl pyridine, polyacrylic acid and polyacrylamide. The core material in the organic microcapsule particles is melted when heated to trigger hole closing at the initial stage of thermal runaway at 60-80 DEG C, the hole closing rate can reach 92%, the hole closing response time is shortened by 30%, and the porous structure of the interface layer can enhance the liquid absorption rate.

The invention relates to a high-temperature electromagnetic functional composite coating and a preparation method thereof, belongs to the technical field of high-temperature electromagnetic functional materials, and solves the problems of narrow absorption frequency band, low absorption loss, poor temperature resistance, poor corrosion resistance, poor environmental medium resistance and poor mechanical property of the existing high-temperature electromagnetic functional coating. From the surface of the substrate from inside to outside, the high-temperature electromagnetic functional composite coating comprises a bonding layer, a protective layer, a functional layer and a surface layer, and the functional layer is made of a thermal spraying composite ceramic material; the multi-layer structure of each layer of the composite coating is mutually coordinated and matched, so that the temperature resistance, the corrosion resistance and the environmental medium resistance of the coating are improved, the electromagnetic wave absorption efficiency is improved, and the service life is prolonged; in addition, the composite ceramic material forming the functional layer has multiple loss mechanisms, the electromagnetic wave absorption frequency band is further widened, and the absorption loss is improved.

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 embodiment of the invention relates to the technical field of ceramics, in particular to conductive silicon carbide-based composite ceramic and a preparation method thereof. The conductive silicon carbide-based composite ceramic comprises the following components in parts by weight: 75-95 parts of silicon carbide and 5-25 parts of niobium diboride, the niobium diboride is generated by reaction of boron powder and niobium powder, and the mass ratio of the boron powder to the niobium powder is 1: 4. The conductivity and fracture toughness of the silicon carbide-based ceramic are improved.

The invention provides a silicon carbide fiber reinforced ceramic-based composite material as well as a preparation method and application thereof, and belongs to the technical field of ceramic-based composite materials. The composite material comprises a silicon carbide fiber reinforced phase, a boron nitride interface layer and a silicon-based multiphase ceramic matrix from inside to outside, the silicon-based multiphase ceramic matrix comprises an infiltration reaction generation phase, an introduced ceramic particle phase and a silicon-containing binary alloy phase, and the infiltration reaction generation phase comprises a water-oxygen corrosion resistant phase, a silicon phase, a silicon carbide phase and a boride phase. The water oxygen corrosion resistant phase comprises a compound of boron and any element of yttrium, ytterbium, hafnium, molybdenum and aluminum, the boride phase comprises B12 (C, Si, B) 3, the bending strength of the composite material is larger than or equal to 600 MPa, and the fracture toughness of the composite material is larger than or equal to 19 MPa.m < 1 / 2 >. According to the preparation method, the matching property among the components of the composite material is optimized, the mechanical property of the composite material is improved, and a new thought and a process method are provided for preparing the high-strength and water-oxygen-corrosion-resistant ceramic matrix composite material.

The invention provides high-energy-storage-density strontium barium calcium niobate / CaAl2Si2O8 dielectric composite ceramic and a preparation method thereof, belongs to the technical field of composite ceramic materials, and aims to solve the technical problem of low energy storage density of composite ceramic. According to the invention, high-entropy ceramic is combined with a second phase composite technology to enhance the energy storage characteristic of strontium barium calcium niobate dielectric ceramic, Sr < 1 / 3 > Ba1 / 3 > Ca < 1 / 3 > Nb < 1-0.2 x > Zr < 0.2 x > Mg < 0.2 x > Ti < 0.2 x > Hf < 0.2 x > Ta < 0.2 x > O < 3 > nano powder is prepared by a microwave sol-gel method, and the strontium barium calcium niobate / CaAl < 2 > Si < 2 > O < 8 > dielectric composite ceramic is prepared by a spark plasma sintering method. The composite dielectric ceramic prepared by the invention has relatively high breakdown-resistant field strength, relatively high dielectric property, energy storage density and good discharge efficiency, the breakdown-resistant field strength reaches 850kV / cm, and the maximum energy storage density reaches 8.23 J / cm < 3 >.

The invention relates to the field of coatings, and discloses a wear-resistant and corrosion-resistant high-entropy alloy composite coating and a preparation method thereof.The wear-resistant and corrosion-resistant high-entropy alloy composite coating is prepared by depositing functional high-entropy alloy composite powder on the surface of a base body in a laser cladding mode, the functional high-entropy alloy composite powder comprises high-entropy alloy powder, a modified additive and composite ceramic powder, the modified additive is prepared by using urea and titanium tetrachloride as raw materials, growing nano titanium nitride particles on the surface of a silicon carbide nanowire in situ to prepare a nano titanium nitride / silicon carbide nanowire composite material, and then coating a layer of nano titanium dioxide particles on the surface of the nano titanium nitride / silicon carbide nanowire composite material by using tetrabutyl titanate; and the composite ceramic powder is prepared by compounding zirconium carbide, niobium carbide, hafnium carbide and tantalum disilicide. The hardness, wear resistance and corrosion resistance of the high-entropy alloy coating are enhanced by adding the modified additive and the composite ceramic powder.

The invention discloses a preparation method of a columnar mullite-reinforced silicon carbide composite ceramic membrane support and a product prepared by the preparation method, silicon carbide powder and aluminum oxide are used as main raw materials, and a sintering aid and a pore forming agent are combined to obtain the silicon carbide composite ceramic membrane support in which columnar mullite crystals are generated in situ at the necks of silicon carbide particles. The preparation method is simple and low in cost, the silicon carbide ceramic membrane support with high porosity, good mechanical strength and water flux and excellent corrosion resistance can be prepared through normal-temperature and normal-pressure sintering, and application and development of a ceramic membrane separation technology are promoted.

The invention belongs to the technical field of ceramic materials, and discloses SiC-HfB2 composite ceramic as well as a preparation method and application thereof. The preparation method of the composite ceramic comprises the following steps: mixing HfSi2 powder, C powder and SiB6 powder, adding a solvent and a ball milling medium, mixing, drying and sieving to obtain ceramic powder, and carrying out SPS sintering at 1700-1900 DEG C under the vacuum degree of 10Pa and the pressure of 20-35MPa to obtain the composite ceramic. The SiC-HfB2 composite ceramic has good mechanical properties, the hardness at room temperature is 26-30 GPa, the fracture toughness is 3.5-4.5 MPa.m < 1 / 2 >, the bending strength is 450-600 MPa, and the SiC-HfB2 composite ceramic can be applied to an ultra-high temperature (2000 DEG C or above) environment or the field of radiation protection.

The invention discloses a preparation method of near-stoichiometric ZrB2 doped SiC fibers, which comprises the following steps: preparing a zirconium-containing multiphase ceramic precursor (PZMS) and polymethylsilane (PMS) into a PZMS / PMS mixed precursor, and blending the PZMS / PMS mixed precursor with spinning-grade polycarbosilane (PCS) to obtain a mixed precursor; the ZrB2-doped silicon carbide fiber with the C / Si atomic ratio close to an ideal value is obtained through the processes of melt spinning, electron beam / BCl3 crosslinking-heat treatment, hydrogen high-temperature pyrolysis, high-temperature sintering and the like in sequence, and regulation and control of fiber components are achieved.

The invention discloses a hafnium hybrid carbon-rich polysiloxane flexible ablation material as well as a preparation method and application thereof, and belongs to the field of advanced materials. According to the invention, a hafnium hybrid carbon-rich siloxane system is designed; in the ablation process, on one hand, a continuous stable carbon skeleton is constructed through a phenyl / vinyl carbon-rich structure; on the other hand, an Hf-O-Si structure is introduced into a polysiloxane main chain, so that formation of SiHfOC composite ceramic at high temperature is promoted, the ablation resistance of the flexible polysiloxane material is remarkably improved, and the flexible polysiloxane material can be used as a base material of a flexible thermal protection coating, a structural part and the like and has a very good application prospect in the field of thermal protection materials.

The invention relates to preparation of a ZTA composite ceramic material, and belongs to the field of inorganic nonmetal composite materials. The raw material composition formula comprises aluminum oxide, zirconium oxide, zirconium dioxide, yttrium oxide, magnesium oxide and titanium dioxide. The low-sodium microcrystalline alumina powder with the original grain size of 0.40 [mu] m is selected and ground to the original grain size in advance, so that zirconia can be more uniformly distributed between alumina grain boundaries, which is a precondition for obtaining more uniform ZTA. Zirconium dioxide is creatively introduced, and compared with a conventional method in which stable zirconium oxide is directly used, the cost of ZTA is greatly reduced. The pre-calcined granulation powder is adopted, so that a ZTA product which is uniformly mixed in the early stage is cured by adding a stabilizer, and then the uniform and stable ZTA ceramic can be obtained through later-stage forming and firing.

The present application belongs to the technical field of ceramic alloy flywheel, and particularly relates to a liquid-liquid composite ceramic inlaid high-wear-resistance flywheel and a preparation method thereof, which is suitable for high-strength impact environment such as mines and metallurgy. The flywheel realizes metallurgical bonding of ceramic-metal by step-by-step pouring and temperature control solidification of basalt melt and high-density W-Ni-Fe alloy melt in a specific mold structure. The ceramic core is composed of multiple inorganic oxides and low-melting-point glass powder, and has excellent interface compatibility and structural stability. During the preparation process, the initial setting state of basalt and the alloy flow path are accurately controlled to improve the interface bonding strength and overall density. The finally obtained flywheel has high hardness, high toughness and excellent wear resistance, and significantly prolongs the service life.

The invention belongs to the technical field of ceramic materials, and particularly relates to a composite ceramic material and a preparation method and application thereof. The eutectic ceramic is prepared by taking aluminum oxide and yttrium oxide stabilized tetragonal phase zirconium oxide powder as raw materials and adopting a laser suspension zone melting directional solidification method, the drawing speed of the laser suspension zone melting directional solidification is greater than or equal to 100 mu m / s, and the laser power is greater than or equal to 300W; the eutectic ceramic is sequentially subjected to crushing, smashing and wet screening, eutectic ceramic powder is obtained, and the particle size of the eutectic ceramic powder is 20-100 microns; mixing the eutectic ceramic powder, silicon carbide whiskers and a sintering aid to obtain mixed powder; the mixed powder is subjected to hot pressing sintering, the composite ceramic material is obtained, and the hot pressing sintering temperature is smaller than or equal to 1550 DEG C. The composite ceramic material obtained by the preparation method provided by the invention has both a large size and a fine structure and has a micro-nano eutectic structure, and the mechanical properties of the material are remarkably improved.