3327 results about "Silicon nitride" patented technology

A method for creating polycrystalline silicon nitride fibers is discussed. The method includes dispersing silicon nitride powder to create dispersed silicon nitride powder. The dispersed silicon nitride powder is classified to create classified fine silicon nitride powder. Likewise, a sintering aid is dispersed to create a dispersed sintering aid and then classified to create a classified sintering aid. A plasticizer, a binder, and the classified sintering aid are added to the classified fine silicon nitride powder to define a compound. The compound is mixed to create a mixed slurry, which is then dried to create a material. The material is extruded through a nozzle that is less than 40 micrometers in diameter to create a preform, which is then sintered to create the polycrystalline silicon nitride fibers.

The invention discloses a lithium battery diaphragm coating based on a nano material and application thereof, and relates to the technical field of lithium battery diaphragms. The coating comprises the following raw materials in parts by weight: 15-25 parts of polystyrene maleic anhydride copolymer modified polyvinylidene fluoride, 10-20 parts of polystyrene, 2-4 parts of nano silicon nitride, 3-6 parts of a boehmite / aluminum oxide and silicon dioxide composite material, 1-2 parts of a dispersing agent and 65-90 parts of a solvent, according to the lithium battery diaphragm coating provided by the invention, the wettability and absorptivity of a diaphragm to an electrolyte are remarkably improved, meanwhile, the lithium battery diaphragm coating also has excellent thermal stability, and the diaphragm can be effectively prevented from thermal shrinkage or melting under a high-temperature condition, so that the safety performance of a battery is remarkably enhanced.

The invention discloses a preparation method of a textured silicon nitride ceramic substrate, and belongs to the technical field of ceramic products. Beta-silicon nitride whiskers with the long diameter of 4-15 microns and the short diameter of 1-3 microns are added into silicon nitride ceramic slurry according to the design, and when the whiskers containing beta-silicon nitride pass through a scraper of a casting machine, the whiskers tend to be directionally arranged in the casting direction, so that a textured structure is generated in the silicon nitride ceramic substrate. The textured structure is beneficial to improving the three-point bending strength, the fracture toughness and the thermal conductivity in the horizontal direction of the ceramic substrate.

The invention relates to the technical field of solar cells, and particularly discloses a back contact solar cell and a preparation method thereof, a cell assembly and a photovoltaic system, the back contact solar cell comprises a silicon substrate, the silicon substrate is provided with a first surface, a second surface and a side surface, the first surface and the second surface are oppositely arranged, and the side surface is respectively connected with the first surface and the second surface; the anti-reflection passivation composite layer comprises a first branch part arranged on the first surface and a second branch part extending from the edge of the first branch part to the outside of the side surface; the anti-reflection passivation composite layer comprises an ultrathin silicon oxide layer, an aluminum oxide layer, a silicon nitride layer, a silicon oxynitride layer and a silicon oxide layer which are sequentially arranged in the direction away from the silicon substrate, and the refractive indexes of the silicon nitride layer, the silicon oxynitride layer and the silicon oxide layer are sequentially decreased. Influences brought by defects on the side face of the silicon substrate can be effectively solved, parasitic absorption on the edge of the cell can be reduced, the anti-reflection and passivation effects of the anti-reflection and passivation composite layer can be effectively improved through mutual cooperation of the multiple material layers, the stress problem can be improved, the conversion efficiency of the cell can be integrally and effectively improved, and the service life of the cell can be prolonged. And the long-term reliability of the battery is ensured.

The invention belongs to the technical field of ceramic preparation, and particularly relates to silicon nitride ceramic and a preparation method thereof. The silicon nitride ceramic is prepared from the following raw materials in parts by weight: 80-99.5 parts of silicon nitride powder and 0.5-20 parts of a sintering aid, the silicon nitride powder is alpha-Si3N4 powder; the sintering aid comprises at least two of CaF2, Y2O3, MgO, Mg (OH) 2, Al (OH) 3, Al2O3, AlN, MgCO3, Mg (NO3) 2, Y (NO3) 3 and Al (NO3) 3. On the basis of an existing silicon nitride dissolution-precipitation sintering mechanism, by adding sintering aids such as low-cost calcium fluoride, introducing a gas-phase mass transfer mechanism and combining a low-cost direct-current electric field assisted sintering technology, low-cost and rapid preparation of the high-performance silicon nitride ceramic is achieved, the process is simple and efficient, and operation is easy to control.

The invention provides a metal matrix composite microstructure strengthening simulation method and system, and relates to the technical field of composite mechanical property simulation, and the method comprises the following steps: establishing a polycrystalline aluminum matrix atomic model and a spherical silicon nitride particle strengthening phase atomic model unit; embedding the spherical silicon nitride particles into the polycrystalline aluminum matrix according to the target embedding position coordinates, and integrating to generate an atomic scale structure model; according to the method, an embedded atom potential function is adopted to describe interaction among atoms in a polycrystalline aluminum matrix, a Tersoft potential function is adopted to describe covalent bond interaction among atoms in spherical silicon nitride particles, and a Lennard-Jones potential function is adopted to describe interaction among heteroatoms at a Si3N4 / Al interface; based on the interaction potential between atoms, molecular dynamics simulation is adopted for conducting uniaxial stretching simulation on the atomic scale structure model, mechanical property parameters of the particle reinforced metal matrix composite are obtained through calculation, and a visualization method is combined for analyzing the microcosmic strengthening mechanism of the particle reinforced metal matrix composite.

The invention relates to the technical field of radio frequency integrated circuits and advanced semiconductor packaging, in particular to a multilayer spiral inductor structure based on an RDL process and a preparation method. The preparation method comprises the steps of seed layer deposition, gradient line width coil formation through photoetching and electroplating, alternate dielectric layer deposition, through hole etching to form vertical interconnection copper columns, air bridge forming through a photoresist sacrificial layer process and silicon nitride passivation packaging. Through fan-shaped topological layout, dielectric material collaborative optimization and three-dimensional interconnection structure design, the self-resonant frequency bandwidth is effectively improved, conductor and dielectric loss is reduced, and miniaturization integration and high reliability of high-frequency inductance elements are achieved.

The invention relates to the technical field of sole processing, in particular to a sole composite processing method, which comprises the following steps: according to the rigidity requirement of an arch support area, preparing high-density slurry in which silicon nitride ceramic powder accounts for 30-40%, forming # imgabs0 # crystal phase through microwave-assisted sintering, and controlling the porosity to be 10-20%; according to the energy rebound requirement of the forefoot buffer area, graphene oxide / carboxymethyl cellulose aerogel powder is added into the slurry until the concentration is 25%, and the porosity is increased to 40-60% by combining the honeycomb porous network design; a nano silicon dioxide reinforcing agent is introduced into a wear-resistant area of the heel to 15%, a diamond-like carbon coating is formed through plasma surface treatment, and the porosity is limited to be 5-15%. According to the invention, silane is encapsulated by adopting polyurea microcapsules, and is released only when the material is damaged, so that dynamic self-repairing is realized, the shoe sole is endowed with dynamic repairing capability, and the service life is prolonged.

The invention discloses a gel solid electrolyte, a preparation method thereof and a lithium ion battery, and relates to the technical field of batteries. The gel solid electrolyte comprises the following components: a solvent, a lithium salt, an inorganic salt or an organic small molecule additive, an ester cross-linking agent polymeric monomer, a silazane polymeric monomer, a diluent and an initiator, the invention also provides a lithium ion battery comprising the gel solid electrolyte and a preparation method of the lithium ion battery. The preparation method has the beneficial effects that by introducing the silazane polymeric monomer and the ester cross-linking agent polymeric monomer, the silazane polymeric monomer and the ester cross-linking agent polymeric monomer can be subjected to a copolymerization reaction, so that in-situ curing of the electrolyte is realized. The silazane fragment in the high-molecular polymer skeleton can effectively realize the constraint on strong Lewis acid substances such as PF5 and can also remove hydrofluoric acid and trace water so as to realize the protection of positive and negative active materials.

The invention provides a polysilazane green special refractory ceramic coating and a preparation method thereof, and belongs to the field of ceramic coatings. The ternary core material composed of titanium carbide, zirconium boride and silicon nitride provides high hardness, oxidation resistance, thermal shock resistance and excellent thermal stability; the silicon dioxide-aluminum oxide composite shell layer remarkably improves the oxidation resistance and reliability of the coating through the synergistic oxidation resistance and crack self-repairing function; the multi-metal oxygen cluster network endows the coating with excellent electrical conductivity, thermal conductivity and corrosion resistance; the intercalated montmorillonite enhances the crack resistance and oxidation resistance through a layered structure and embedded active ions; and the boron nitride coated vanadium carbide particles provide lubricity, oxidation resistance and wear resistance. Through collaborative optimization of multiple components, the comprehensive performance of the coating is comprehensively improved in the aspects of oxidation resistance, thermal conductivity, interface stability, high-temperature performance, mechanical performance and the like, so that the coating shows excellent long-term stability and functionality in an extreme environment.

The utility model relates to the technical field of power semiconductor devices, and discloses a super-junction VDMOS device resistant to static breakdown, which comprises a drain electrode and a grid electrode, an N + substrate is deposited on the upper surface of the drain electrode, a buffer layer is arranged above the N + substrate, a first N-epitaxial layer grows on the upper surface of the buffer layer, and a second N-epitaxial layer grows on the lower surface of the buffer layer. A first N-epitaxial layer is grown on the substrate, a P-region is formed in the first N-epitaxial layer through ion implantation diffusion, a second N-epitaxial layer grows on the first N-epitaxial layer, highly-doped P columns are arranged on the two sides in the second N-epitaxial layer, a heavily-doped region hole potential barrier region is arranged on one side of each P column, and a lightly-doped region hole potential well region is arranged on the lower side of one side of each P column. According to the VDMOS device, the thickness of the gate dielectric layer is increased, the total thickness of the gate dielectric layer is 100 nm, the single-particle shrinkage-through effect of the VDMOS device can be effectively improved, the gate dielectric layer is composed of 20 nm silicon dioxide and 80 nm trisilicon nitride, the single-particle shrinkage-through resistance characteristic of the device is further improved, and under the same gate voltage, gate-source electric leakage is reduced.

The invention discloses a combined passivation back contact battery which comprises an N-type silicon wafer, a second intrinsic amorphous silicon layer, a microcrystalline silicon layer, an anti-reflection layer, a second semiconductor opening region, a first semiconductor opening region and a transition region, the anti-reflection layer is a single-layer amorphous silicon carbonitride layer or a laminated structure composed of an amorphous silicon carbide layer and an amorphous silicon carbonitride layer, and the second semiconductor opening area is composed of a first intrinsic amorphous silicon layer, a P-type amorphous silicon layer, a transparent conductive film and a metal electrode which are sequentially arranged on the back face of the silicon wafer. The first semiconductor opening area is composed of a tunneling oxide layer, an N-type polycrystalline silicon layer, a transparent conductive film and a metal electrode which are sequentially arranged on the back face of the silicon wafer, and an opening is etched in the transparent conductive film on the surface of the transition area to form an insulation groove. Amorphous silicon carbonitride or amorphous silicon carbide / amorphous silicon carbonitride laminated layers are adopted as the anti-reflection layers, so that reflection loss is reduced, the reliability and durability of the cell are improved, and the conversion efficiency of the cell is improved.

The invention relates to the technical field of high-performance ceramic preparation, in particular to a partial pressure sintering method of a silicon nitride ceramic chip, which comprises the stages of charging, negative pressure degreasing, partial pressure sintering, pressure sintering and rapid cooling: during charging, charging a green body containing a silicon nitride raw material and Y2O3 and MgO auxiliaries into a furnace, and exhausting air; in the negative-pressure degreasing stage, low-pressure nitrogen and staged heating are used for promoting formation and volatilization of an auxiliary liquid phase; volatile matters are released through stepped nitrogen partial pressure in the partial pressure stage; in the pressurizing stage, gradient increase of pressure from low pressure to 35 bar is achieved through phase change buffering, high-temperature densification, ultra-high-temperature homogenization and slow cooling, and precise pressure control is achieved by combining dynamic pressure-static pressure mode switching; according to the method, the problems of cracking, uneven density and the like of a traditional process are effectively solved, the ceramic chip yield and the dimensional precision are improved, the microstructure and the mechanical property are optimized, the high-temperature applicability and the thermal property are enhanced, meanwhile, the use amount of auxiliaries is reduced, energy consumption is reduced, and practicability and economical efficiency are achieved.

The invention discloses a composite modified material for a lithium niobate wafer, and relates to the technical field of nano materials. The material is composed of an anti-corrosion passivation matrix and a function enhancement component, wherein the anti-corrosion matrix adopts a silicon nitride / SiO2 multi-layer composite layer, atomic layer deposition titanium dioxide and magnetron sputtering aluminum oxide to form cascade protection; the functional layer comprises lead sulfide nanoparticles and nano silicon dioxide, and is directionally modified by a silane coupling agent and a perfluoropolyether surfactant. During preparation, PbS nano-particles are synthesized by combining a PECVD-ALD-magnetron sputtering stepped deposition process (200-150 DEG C) with a solvothermal method, and finally, the PbS nano-particles are formed through spin coating-annealing (300-400 DEG C). The optical loss of the material under the wavelength of 1550 nm is smaller than 0.2 dB / cm, the acid and alkali corrosion resistance is larger than 240 h, the lead dissolution rate is smaller than 0.1 ppm, the interface state density is reduced by 2 orders of magnitude, the contradiction between lithium niobate wafer surface degradation, photoelectric property degradation and lead-containing material environment risk is solved, and the material is suitable for 5G optical waveguide and quantum integrated device packaging.

The invention discloses a silicon nitride ceramic based on a Yb2O3-MgSiN2 composite sintering aid and a preparation method of the silicon nitride ceramic, the silicon nitride ceramic comprises 93wt% of a Si3N4 matrix, 1-7wt% of Yb2O3 and the balance of MgSiN2, and the total mass of the Yb2O3 and the MgSiN2 as the composite sintering aid is 7wt%. The preparation method comprises the following steps: mixing the raw materials with absolute ethyl alcohol, then adding grinding balls, pouring the mixture into a polyethylene ball milling tank for ball milling, carrying out forced air drying treatment and grinding and sieving treatment on obtained slurry, and then putting sieved powder into a mold for SPS sintering. The problems that traditional silicon nitride ceramic is too high in sintering temperature, insufficient in grain boundary stability and the like are solved, and performance balance of low-temperature sintering, low oxygen content and high grain boundary stability of the silicon nitride ceramic is achieved under the industrial-grade production condition through the synergistic effect of material component innovation and process optimization; and a key material solution is provided for preparing the silicon nitride ceramic with good performance.

The invention relates to the technical field of optoelectronics, and discloses a compact mixed optical path high-density integration method of a multi-level waveguide composite structure, which comprises the following steps: S1, preparing a multi-material layer: sequentially depositing a silicon layer, a silicon nitride layer and a lithium niobate layer, preparing the silicon layer and the silicon nitride layer through a chemical vapor deposition process, preparing the lithium niobate layer through direct current magnetron sputtering, and preparing the multi-material layer; the refractive indexes of the silicon layer, the silicon nitride layer and the lithium niobate layer meet gradient distribution; s2, designing an interlayer coupling structure: forming a gradient waveguide coupler at an interface of adjacent material layers to realize interlayer light field transmission; and S3, stress regulation and control layer integration: arranging a buffer layer with a matched thermal expansion coefficient between the silicon layer and the silicon nitride layer. According to the invention, the silicon layer, the silicon nitride layer and the lithium niobate layer are sequentially deposited, and the refractive index of each layer satisfies gradient distribution, so that the problems of large light field reflection and scattering loss and low coupling efficiency caused by the fact that most of the traditional multilayer waveguide structures adopt single material layers are solved.

The invention discloses high-toughness ultrathin flexible glass and a preparation method thereof, and relates to the technical field of glass manufacturing. The ultrathin flexible glass is prepared from the following raw materials: silicon dioxide, aluminum oxide, lithium oxide, sodium oxide, magnesium oxide, a modified nano reinforced phase, a high-temperature melting regulator and cerium dioxide. The modified nano reinforced phase is prepared by the following steps: pre-treating silicon carbide and silicon nitride with hydrochloric acid, and mixing with nano zirconium oxide to obtain a mixture; and modifying the mixture with a silane coupling agent to obtain the modified nano reinforced phase. The high-temperature melting regulator is a mixture of lithium borate, sodium sulfate and lithium fluoride. The preparation method of the ultra-thin flexible glass comprises the following steps: preparing the modified nano reinforced phase, melting and homogenizing the glass, forming the glass substrate, and preparing the ultra-thin flexible glass. The ultra-thin flexible glass prepared by the invention has relatively high fracture toughness and structural rigidity, excellent flexibility and bending fatigue durability, and excellent thermal shock resistance.

The invention discloses a passivation contact cell structure and a preparation method thereof, the structure comprises a silicon substrate, and the back surface of the silicon substrate comprises a metal contact area and a non-metal contact area; a metal contact area on the back face of the silicon substrate is of a suede structure, and the suede structure is sequentially provided with a back face first tunneling oxide layer, a back face first doped polycrystalline silicon layer, a back face second tunneling oxide layer, a back face second doped polycrystalline silicon layer, a back face aluminum oxide layer, a back face silicon nitride layer and a back face electrode in a stacked mode from inside to outside. A non-metal contact area on the back face of the silicon substrate is of a polished face structure, and a first back face tunneling oxide layer, a first back face doped polycrystalline silicon layer, a back face aluminum oxide layer and a back face silicon nitride layer are sequentially arranged on the polished face structure in a stacked mode from inside to outside. According to the battery structure, parasitic absorption can be reduced, current gain is brought, diffusion of silver ions in electrode slurry can be inhibited, and metal recombination is improved; the interface contact resistance can be obviously improved, and the cell efficiency can be improved.

The invention belongs to the technical field of silicon nitride ceramic substrates, and particularly relates to a high-thermal-conductivity and high-breaking-strength silicon nitride substrate and a sintering method and application thereof. In order to simultaneously improve the thermal conductivity and the breaking strength of the existing silicon nitride ceramic substrate and ensure the stability and the consistency of the performance during the production of the silicon nitride substrate, the method comprises the following steps: coating the surface of a silicon nitride ceramic biscuit subjected to tape casting with isolation powder, carrying out nitrogen or air atmosphere glue removal treatment, and then sintering; in the sintering process, the cooling process is optimized, a multi-temperature heat preservation platform is arranged above the liquid phase conversion temperature, grain growth and grain boundary composition of the silicon nitride ceramic are regulated and controlled, grain size distribution of the silicon nitride ceramic is made to be more uniform, the grain boundary structure is made to be more optimized, and the heat conductivity coefficient and breaking strength of the substrate are remarkably improved. Meanwhile, the uniformity of a temperature field in the sintering furnace can be greatly improved through the sintering method, it is ensured that the product can reach the consistent performance standard in different areas, and the stability and reliability of the product are improved.

The invention relates to the technical field of stainless steel pneumatic cylinder barrels, and particularly discloses a wear-resistant stainless steel pipe for a pneumatic cylinder barrel and a preparation process thereof.The wear-resistant stainless steel pipe for the pneumatic cylinder barrel comprises the steps that firstly, a powder metallurgy method is adopted, tungsten carbide, cerium oxide, chromium nitride and other components are added into stainless steel powder, and the performance of a steel pipe base body is enhanced; the corrosion-resistant alloy layer is deposited on the surface of the steel pipe, so that the corrosion resistance, wear resistance and other properties of the steel pipe are enhanced, finally, a silicon nitride wear-resistant ceramic layer is sintered on the surface of the corrosion-resistant coating, and two lubricants of graphite and molybdenum sulfide are synthesized in gaps and holes of the wear-resistant ceramic layer. The defects on the ceramic surface are blocked; and the ceramic coating is endowed with a self-lubricating function.

The present invention features a micrometer-scale torsion balance device comprising a rigid mass and two or more nanoribbons attached to the rigid mass. The rigid mass may be suspended by the two or more nanoribbons. The two or more nanoribbons may be placed under tensile stress. A local acceleration value may be derived from a torsional stiffness of the two or more nanoribbons. In some embodiments, the rigid mass may comprise silicon. In some embodiments, the two or more nanoribbons may comprise silicon nitride. In some embodiments, the rigid mass may have a polygon shape, the polygon shape having four or more sides. A side of the four or more sides may be longer than all others.

The invention belongs to the technical field of silicon nitride ceramic preparation, and particularly relates to a method for preparing silicon nitride ceramic through lifting type LCD photocuring technology 3D printing, and the method comprises the following steps: carrying out oxidation pretreatment on silicon nitride powder; mixing a sintering aid silicon nitride powder to obtain mixed powder; mixing the mixed resin, a reactive diluent, a photoinitiator and a coloring agent to obtain photosensitive resin; mixing and ball-milling a dispersing agent, the mixed powder and photosensitive resin to obtain light-cured ceramic slurry; 3D printing is conducted on the photocuring ceramic slurry through a lifting type LCD photocuring technology, and a ceramic green body is obtained; dumping the ceramic body to obtain a ceramic green body; sintering the ceramic green body to obtain the silicon nitride ceramic. Compared with the prior art, the problems of low curing depth, curing efficiency and precision of the silicon nitride ceramic slurry formed by photocuring in the prior art are solved. According to the scheme, the silicon nitride ceramic is formed by using the lifting type LCD printing technology, so that the performance of the ceramic is ensured, the production efficiency is improved, and the production cost is reduced.

The invention provides a low-compression-stress low-density heat-conducting gasket and a preparation method thereof.The heat-conducting gasket is prepared from, by weight, 100-300 parts of vinyl silicone oil, 1-3 parts of end chain hydrogen-containing silicone oil, 2-6 parts of side chain hydrogen-containing silicone oil, 0.2-0.6 part of platinum catalyst, 300-700 parts of heat-conducting filler, 0.1-0.5 part of coupling agent and 0.1-0.5 part of inhibitor. Wherein the vinyl silicone oil is prepared by matching two kinds of vinyl-terminated polydimethylsiloxane with different viscosities and vinyl contents; and the heat-conducting filler is a ternary combination of spherical aluminum oxide, spherical boron nitride and beta-type silicon nitride with a lubricating function. The preparation method comprises the following steps: adding the raw materials into stirring equipment, controlling the vacuum degree during stirring by adopting staged negative pressure, stirring under the conditions that the negative pressure is less than or equal to-0.095 MPa,-0.06 to-0.07 MPa and less than or equal to-0.095 MPa in sequence, fully mixing the materials, clustering, transferring to a calender, and carrying out high-temperature vulcanization molding at 120-140 DEG C. The heat-conducting gasket has the characteristics of low compression stress and low density, and the production efficiency is remarkably improved.

The invention provides a sidewalk antiskid terrace material and a construction process thereof, and belongs to the technical field of terrace material manufacturing. The sidewalk antiskid terrace material is prepared from the following components: epoxy resin, polysiloxane elastic resin, fluorocarbon resin, modified covalent organic framework nanosheets, boron nitride nanotubes, nano silicon nitride particles, nano silicon dioxide, nano zinc oxide, a modified flame retardant, attapulgite, a curing agent, an accelerant, a flatting agent, a coupling agent and a dispersing agent. According to the sidewalk antiskid terrace material, various high-performance resins are compounded with the nano filler to form a coating with a compact and uniform structure, so that the mechanical strength and wear resistance of the terrace are remarkably improved. In addition, due to the application of the modified flame retardant, the floor has a good flame-retardant effect, and the safety is improved. The whole formula and the construction process are scientific and reasonable, strong adhesion of the coating is ensured, construction is simple and convenient, curing is sufficient, and the coating is suitable for long-term use of outdoor sidewalks and has attractive appearance and practicability.

The invention belongs to the technical field of glass materials, and discloses thermal shock resistant transparent high borosilicate glass which comprises the following components in percentage by weight: 60-70% of silicon dioxide, 18-22% of diboron trioxide, 4-7% of aluminum oxide, 3-5% of magnesium oxide, 2-4% of alkali metal oxide, 0.5-1.5% of nano silicon nitride and 0.5-1% of nano aluminum titanate. The thermal shock temperature difference of the glass within the temperature change range of 20-200 DEG C is larger than or equal to 180 DEG C, the light transmittance within the visible light range of 400-760 nm is larger than or equal to 85%, the alkali metal oxide is composed of sodium oxide and potassium oxide, the weight ratio of the sodium oxide to the potassium oxide is 1: 1-3: 1, the average particle size of the nanometer silicon nitride is smaller than or equal to 100 nm, and the nanometer silicon nitride is evenly dispersed in the glass matrix; according to the thermal-shock-resistant transparent high borosilicate glass and the preparation method thereof, the thermal shock resistance and light transmittance of the glass are improved by optimizing the chemical components of the glass and adding the special nanoparticles in cooperation with a specific preparation process, and the thermal shock resistance of the glass is improved. The problems that existing high borosilicate glass is insufficient in thermal shock resistance and low in light transmittance in a high-temperature environment are solved.

The invention discloses a silicon nitride ceramic-based composite material and a preparation method thereof, and relates to the technical field of silicon nitride ceramics. The silicon nitride ceramic-based composite material is prepared from silicon dioxide coated modified boron nitride and resin composite phase change microcapsules, Si3N4-C coated Al2O3 core-shell fiber aerogel, nano yttrium oxide and polyvinyl butyral, the silicon dioxide coated modified boron nitride and resin composite phase change microcapsules are stably attached to the surface of the Si3N4-C coated Al2O3 core-shell fiber aerogel in a chemical bonding and mechanical interlocking mode, the interface bonding strength is enhanced, the risk of phase separation is reduced, the combination effect of the silicon dioxide coated modified boron nitride and resin composite phase change microcapsules and the Si3N4-C coated Al2O3 core-shell fiber aerogel is better exerted, and the composite phase change effect of the silicon dioxide coated modified boron nitride and resin composite phase change microcapsules is improved. According to the present invention, the fracture toughness can be improved through fiber toughening, aerogel pore and microcapsule stress dispersion, the high temperature resistance can be improved through the low thermal conductivity of the aerogel and the heat absorption effect of the microcapsule, the mechanical property of the silicon nitride can be significantly improved through multiple ways and multiple modes, and the high temperature resistance can be effectively enhanced.

The invention provides titanium-containing anhydrous stemming for a blast furnace and a preparation method of the titanium-containing anhydrous stemming, and belongs to the technical field of refractory materials for the blast furnace. The titanium-containing anhydrous stemming for the blast furnace comprises the following raw materials: 40-60 parts of titanium corundum, 5-15 parts of silicon carbide, 10-20 parts of ferro-silicon nitride fine powder, 5-15 parts of titanium dioxide fine powder, 5-15 parts of vanadium-titanium slag fine powder, 5-10 parts of coke fine powder, 1-5 parts of monatomic silicon fine powder, 1-5 parts of ball clay micro powder, 1-5 parts of aluminum nitrate micro powder and 1-2 parts of magnesium alon micro powder. Gas-phase substances of Si (g), Al (g) and Mg (g) can be formed in the stemming at high temperature by the monatomic silicon fine powder and the MgAlON micro powder in the raw materials and react with CO and N2 in the environment to generate ceramic whiskers such as SiC, Si3N4, AlN and MgAl2O4, and the generated ceramic whiskers are distributed in a staggered manner and are filled in pores of the stemming, so that the high-temperature strength and the volume stability of the stemming are remarkably improved.

The invention relates to the field of architectural ceramics, and discloses a sapphire effect dry particle, a ceramic tile with a sapphire imitation effect and a preparation method of the ceramic tile. The sapphire effect dry granules comprise blue dry granules and transparent dry granules, wherein the blue dry granules are prepared from the following raw materials: 1.5 to 3.5 parts of superfine tin dioxide, 15 to 19.5 parts of cobalt oxide, 4.5 to 7.5 parts of titanium oxide, 8 to 14 parts of zinc oxide, 32 to 43 parts of calcined aluminum oxide, 8 to 13 parts of quartz, 10 to 16 parts of potassium feldspar and 2.5 to 4.5 parts of boric acid; the transparent dry particles comprise the following raw materials in parts by weight: 8-15 parts of zinc oxide, 5-10 parts of aluminum oxide, 24-28 parts of quartz, 1-2.5 parts of nano silicon nitride and 7-11 parts of cryolite. By mixing the two dry granules, the frit dry granules which have a three-dimensional effect and an ice crack texture and imitate the texture of sapphire crystals can be prepared. The ceramic tile with the sapphire-like effect can be prepared by adopting the dry particles with the sapphire effect.

The invention relates to the technical field of metal wire processing, and discloses a high-performance metal wire plastic coating process for aerospace engineering, which comprises the following steps: carrying out base material type selection on a metal wire, and carrying out surface treatment of precise cleaning, etching and depth gradient activation; a Ti-Cr alloy and graphene-copper composite transition layer is deposited through a magnetron sputtering technology, and a multi-layer coating structure is formed through electrostatic spraying of a base coating, a fluidized bed dipping function layer and high velocity oxy-fuel spraying of a nano composite coating in sequence; the molybdenum-gold composite sealing layer is prepared by adopting an electric arc spraying technology, and is subjected to vacuum ultraviolet curing enhancement, high-temperature gradient annealing, gradient sintering and vacuum curing treatment; and heat radiation on the surface of the coating is enhanced through laser-induced micro-nano structure regulation and silicon nitride film sputtering. Through collaborative optimization of base material treatment, coating construction, function strengthening and quality control, the interface bonding strength, the comprehensive performance and the environmental adaptability of the spaceflight metal wire coating are remarkably improved, and the service life of the spaceflight metal wire coating is remarkably prolonged.

The invention relates to the technical field of polymer composite materials, and discloses a nano-ceramic-based composite insulating coating and a preparation method thereof, and the coating is prepared from a composite resin matrix, a composite functional ceramic filler, a double-reactivity organosilicon linker and an initiator. Wherein the composite resin matrix is composed of vinyl-terminated polydimethylsiloxane and a vinyl ether functionalized fluorocarbon copolymer, and a soft and rigid interpenetrating network structure is formed. The composite functional ceramic filler is prepared from needle-shaped silicon nitride, flaky hexagonal boron nitride, nano silicon dioxide, nano cerium oxide and nano barium titanate. According to the invention, a chemical bonding interface is constructed between the inorganic filler and the organic resin, and the synergistic effect of the composite matrix and the multifunctional filler is optimized, so that the coating has excellent adhesive force, flexibility and thermal shock resistance, obtains high volume resistivity and breakdown strength, and meets the insulation protection requirements under harsh working conditions.