795 results about "Aluminium oxide" patented technology

The invention discloses a method of preparing aluminum oxide-silicon carbide compound porous ceramic by aluminum-silicon industrial waste residues. The primary raw materials comprise industrial waste residues, carbon powder, a pore forming substance and an adhesive. The aluminum oxide-silicon carbide compound porous ceramic is prepared by the following steps of mixing, drying, forming and sintering to obtain a final product. Treatment and high additional value utilization of the industrial waste residues are achieved. The prepared porous ceramic is remarkable in performance, and can be applied to the fields of filtration, sound isolation, heat isolation, fire fighting and the like. The method is simple in process flow and convenient for industrialized promotion; and the cost is good to control and the method has extreme economical value.

The invention relates to a preparation method of monodisperse spherical alumina powder with uniform granularity. The preparation method comprises the following steps: dissolving and stirring an aluminum source, a precipitator and a dispersing agent in ultrapure water to prepare an aluminum oxide precursor solution; transferring the prepared aluminum oxide precursor solution into a hydrothermal reaction kettle, carrying out heating reaction, after the hydrothermal reaction is finished, naturally cooling to room temperature, alternately and respectively washing with ultrapure water and ethanol, and drying to obtain aluminum oxide precursor powder; and sintering the prepared aluminum oxide precursor powder in a muffle furnace in an air atmosphere to obtain the spherical aluminum oxide powder. The hydrothermal method is adopted to react in a high-temperature and high-pressure environment, so that the reaction uniformity is improved, and the spherical aluminum oxide precursor with uniform granularity and consistent morphology is obtained. The bending strength of the obtained ceramic material is remarkably improved, and the highest bending strength reaches 245MPa. The method has wide application prospects in the fields of heat-conducting composite materials, integrated circuit films, substrate materials, 3D printing materials, precision polishing materials and the like.

The invention discloses a high heat storage density stable thermochemical adsorption composite heat storage material and a preparation method thereof, the high heat storage density stable thermochemical adsorption composite heat storage material comprises 54%-57% by mass of mixed salt and 43%-46% by mass of a porous material, the mixed salt comprises MgSO4 and MgCl2, the mass ratio of MgSO4 to MgCl2 is 9: 1-6: 4, and the porous material is expanded perlite modified by nano alumina or a silane coupling agent. The high-heat-storage-density stable thermochemical-adsorption composite heat storage material provided by the invention is simple in preparation method, and the modified expanded perlite is used as a carrier of the mixed hydrated salt; the obtained composite heat storage material has excellent performance: the salt-containing load rate is 114-121%, the water absorption rate is 1.2-1.28 g / g, the heat storage density is 1123.5-1208.6 kJ / kg, the heat storage temperature is 133.4-141.3 DEG C, the structural strength is 10.346-12.631 kPa, the structural stability is 99.27-99.53%, and the stability is 79.7-83.3% after circulation for 30 times, that is, the composite heat storage material is high in heat storage density, high in water absorption rate, low in heat storage temperature, high in strength and not easy to scatter and fall off, and the composite heat storage material is suitable for large-scale production. And the material also has relatively good cycling stability.

The invention discloses a blue-and-white glaze and a preparation method and application thereof, and belongs to the technical field of inorganic non-metallic materials (ceramics), the blue-and-white glaze comprises quartz, feldspar, limestone, plant ash and other basic raw materials, zinc oxide, aluminum oxide, lanthanum oxide, cerium oxide and other rare earth elements, and a modified organic additive is introduced. Compared with the prior art, the blue-and-white glaze shows excellent stability in the drying and firing process, the phenomena of cracking and glaze stripping are effectively reduced, the friction coefficient after firing is low, the breaking strength and the breaking modulus are high, the glossiness and transparency of a glaze surface are remarkably improved, and the blue-and-white glaze has important application value.

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 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 relates to the technical field of ceramic substrates, and provides a high-toughness aluminum oxide ceramic substrate and a preparation method thereof, the high-toughness aluminum oxide ceramic substrate comprises the following raw materials by weight: 100 parts of aluminum oxide, 1-3 parts of a plasticizer, 4-6 parts of an auxiliary agent, 4-6 parts of a binder, 1-3 parts of a dispersant, and 55-65 parts of water; the auxiliary agent is composed of an auxiliary agent A and an auxiliary agent B, the auxiliary agent A comprises rare earth oxide, and the auxiliary agent B is composed of molybdenum boride, scandium oxide and zirconium oxide. According to the technical scheme, the problem of low toughness of the aluminum oxide ceramic substrate in the prior art is solved.

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 belongs to the technical field of metamaterial sensors, and particularly relates to a metamaterial multi-parameter sensor for a complex environment, which comprises a dielectric substrate, a temperature sensor, a pressure sensor and a strain sensor, and is characterized in that the dielectric substrate is made of high-temperature co-fired alumina ceramic; the temperature sensor is arranged at the left end of the dielectric substrate; the pressure sensor is arranged in the middle of the medium substrate; and the strain sensor is arranged at the right end of the dielectric substrate and comprises a metal sheet structure capable of generating relative displacement. According to the invention, long-distance signal monitoring is realized by adopting a microwave scattering technology, and the problem that a traditional wired sensing transmission line is damaged at a high temperature is solved; the high-temperature-resistant aluminum oxide HTCC ceramic is used as the dielectric substrate, temperature measurement within the range of 25 DEG C to 1200 DEG C, pressure within the range of 0 kPa to 700 kPa and strain measurement within the range of-400 mu epsilon to + 400 mu epsilon are achieved, the sensor is smaller in size and higher in sensitivity, and application of a traditional sensor in the multi-metal environment is expanded.

The invention discloses a high-thermal-conductivity insulating electric power engineering material and a preparation method thereof, and relates to the technical field of insulating material preparation. The composite material is prepared from 40-60 parts of polyimide resin, 20-30 parts of boron nitride nanosheets, 10-15 parts of alumina micro powder, 5-10 parts of a silane coupling agent, 3-8 parts of a plasticizer, 2-5 parts of an antioxidant, 1-3 parts of carbon nanotube whiskers, 1-2 parts of graphene quantum dots and 0.5-1 part of rare earth yttrium oxide. The diameter-thickness ratio of the boron nitride nanosheet is 100-200, the particle size of the alumina micro powder is 1-5 [mu] m, the diameter of the carbon nanotube whisker is 5-20 nm, the length is 1-5 [mu] m, and the particle size of the graphene quantum dot is 2-10 nm; all the raw materials are synergistically matched, so that the material is expected to have high thermal conductivity and excellent insulating property and is suitable for the field of electric power engineering. The material has high thermal conductivity and excellent insulativity, the thermal conductivity coefficient is not lower than 5 W / (m.K), the volume resistivity is not lower than 1015 omega.cm, and the breakdown field strength is not lower than 30 kV / mm.

The invention provides a hierarchical porous silicon material and a preparation method thereof, and belongs to the technical field of comprehensive utilization of fly ash. The preparation method of the hierarchical porous silicon material provided by the invention comprises the following steps: mixing fly ash and an activating agent, and calcining to obtain activated fly ash; the activating agent comprises at least one of sodium salt and potassium salt; and mixing the activated fly ash with hydrochloric acid, and carrying out acid etching to obtain the hierarchical porous silicon material. According to the invention, at least one of sodium salt and potassium salt is adopted to activate the fly ash, and at least one of Na < + > and K < + > in the activation process can promote the conversion of mullite in the fly ash to different mineral phase aluminosilicate, so that a nepheline structure of Na and / or K is formed; and then hydrochloric acid is adopted for acid etching, and the alumina component can be selectively etched, so that the hierarchical pore channel is constructed, the process is simplified, and template-free preparation of the hierarchical pore silicon material is realized.

The invention belongs to the technical field of metal surface treatment, and discloses a high-uniformity metal surface silver plating process and a corrosion-resistant treatment method thereof.The high-uniformity metal surface silver plating process comprises the following steps that firstly, pretreatment is conducted; step 2, activating treatment; step 3, pre-plating a bottom layer; step 4, electrosilvering; step 5, post-processing; according to the method, pre-plating of the bottom layer and electroplating of silver are combined, a layer of thin nickel or copper is pre-plated firstly, and then electroplating of silver is performed, so that the binding force and uniformity of the silver plating layer are effectively improved, and in the electroplating process, the mode of stirring and circulating the electroplating liquid is adopted, so that silver ions in the electroplating liquid are uniformly distributed, and the uniformity of the plating layer is improved; and a thin aluminum oxide protective film is deposited on the surface of the silver plating layer by adopting a chemical vapor deposition technology, so that the corrosion resistance of the silver plating layer is further improved.

The invention discloses stable zirconia high-toughness ceramic and a preparation method thereof.The stable zirconia high-toughness ceramic comprises a base material, a reinforcing phase and an interface transition zone, the base material is Y2O3-ZrO2 nano powder, the reinforcing phase comprises compact layers and porous layers which are alternately distributed, the compact layers enable alumina whiskers to be radially distributed in the radial direction, and the porous layers enable the alumina whiskers to be evenly distributed in the radial direction; a crystal whisker-nano particle-matrix three-stage toughening network is formed, a porous layer contains beta-Si3N4 crystal whiskers generated in situ, and an interface transition region is a ZrO2-beta-Si3N4 eutectic layer. According to the invention, the whisker is added, the fracture energy is consumed through the pull-out effect, the nano-particles inhibit crack propagation through the pinning effect, the matrix phase change is toughened, the fracture toughness of the ceramic is improved, and the crack propagation path is prolonged by 3-5 times. On the other hand, the sintering temperature is reduced, so that energy consumption is reduced.

The invention belongs to the technical field of conductive ceramics, and discloses a silicon nitride conductive ceramic material and a preparation method thereof.The method comprises the steps that a yttrium oxide, aluminum oxide and magnesium oxide ternary composite system is arranged, rare earth elements are doped, and a sintering aid is formed; a resistance adjusting agent is composed of a titanium nitride-titanium dioxide core-shell structure and silicon carbide fibers, and the silicon carbide fibers are directionally distributed and arranged in a magnetic field, so that efficient composition of the silicon nitride conductive ceramic material is achieved, and the effects of high bending resistance, high conductivity and low sintering temperature are achieved; forming the slurry; performing spark plasma sintering; conducting network directional regulation and control; the preparation method comprises the steps of raw material mixing and ball milling, post-treatment and performance optimization, a convenient preparation process can be formed, too many tedious steps are not needed, a ball mill used in raw material mixing and ball milling is further provided with a pre-grinding device for pre-grinding the materials, the subsequent ball milling quality is enhanced, and the situation that the materials are not completely ground is avoided.

The invention relates to the technical field of round bin building construction, in particular to an aluminum oxide bin upside-down construction method. S1, measuring and positioning the top surface of the completed foundation; and S2, the annular bottom plate is installed and fixed to the top face of the foundation. And S3, a center cylinder temporary fixing support is arranged on the top face of the foundation. And S4, the first circle of wall plates are assembled and fixed. And S5, assembling of the silo top structure is completed. And S6, a plurality of hydraulic jacking devices are evenly distributed around the inner circumference of the foundation. And S7, the hydraulic jacking device is operated to synchronously jack the first circle of wall plate. And S8, the next circle of wall plates are assembled and welded in the new assembling space. And S9, the hydraulic jacking device is operated to enable the supporting block to descend to the bottom, and a bracket is welded to the lower portion of the next circle of wall plate. And S10, the steps of jacking, assembly welding, supporting block descending and bracket welding are repeated. According to the construction method, the construction sequence of firstly assembling the warehouse top, then jacking the warehouse top circle by circle and inversely installing the wall plates is adopted, so that the safety risk caused by erecting a high-altitude scaffold in a traditional forward installation method is effectively avoided.

The invention relates to chemical-corrosion-resistant full-polished glaze as well as a preparation method and application thereof, and belongs to the technical field of ceramic production and manufacturing. The chemical-corrosion-resistant fully-polished glaze comprises the following mineral components in percentage by mass: 5%-10% of quartz, 5%-10% of kaolin, 1%-10% of calcined talc, 20%-25% of wollastonite, 10%-20% of calcined kaolin, 1%-5% of calcined alumina, 1%-5% of calcined zinc oxide, 1%-5% of barium carbonate, 1%-3% of titanium oxide, 1%-5% of zirconium silicate and 10%-20% of boron frit. By specially designing a full-polishing glaze formula of the ceramic tile, adjusting the firing temperature and discharging or reducing defects such as air holes in a glaze layer as much as possible, the glaze layer forms a stable inert surface, and chemical substances cannot react with the glaze layer or only slightly react with the glaze layer, so that the transparency, integrity and glossiness of the surface are kept.

The invention belongs to the technical field of coatings, and discloses a preparation method and application of a low-temperature fast-curing coiled material powder coating, and the preparation method comprises the following steps: S1, adding raw materials of the low-temperature fast-curing coiled material powder coating into a high-speed mixer, and mixing for 5-8 minutes at the rotating speed of 1200-1600r / min to ensure that the components are uniformly dispersed; s2, adding the mixture into a double-screw extruder for melt extrusion, wherein the temperature of the double-screw extruder is 80-90 DEG C in a first area, 100-110 DEG C in a second area, 120-130 DEG C in a third area and 110-120 DEG C in a fourth area, and the rotating speed is 200-250 r / min; s3, tabletting and cooling to 40 DEG C or below, after coarse crushing, adopting an ACM pulverizer and a grading screen of 80-120 meshes to obtain the low-temperature fast-curing coiled material powder coating, low-temperature curing and fast film forming are achieved through component cooperation, the process adaptability is high, meanwhile, functional filler modified sericite and modified nanometer aluminum oxide are added, and the low-temperature fast-curing coiled material powder coating is prepared. The two synergistically enhance the corrosion resistance, mechanical strength and environmental adaptability of the powder coating paint film.

The invention relates to an alkali-activated solid waste cementing repair material and a preparation method thereof, and belongs to the technical field of solid waste resource utilization and building materials. The repairing material is prepared from the following raw materials in parts by weight: 30 parts of fly ash, 70 parts of blast furnace slag, 40 parts of machine-made sand, 45-50 parts of water, 7-13 parts of an exciting agent, 1-2 parts of sodium tetraborate, 1-2 parts of calcium oxide, 1-2 parts of magnesium oxide, 1-2 parts of calcium sulphoaluminate, 0.5 part of aluminum oxide, 0.2 part of aluminum potassium sulfate, 0.2 part of aluminum powder, 0.2 part of alunite and 1 part of polyethylene glycol. By optimizing the modulus of the exciting agent, the alkali content, the water-binder ratio and the admixture ratio, the material has the shrinkage-compensating and micro-expansion characteristics, the compressive strength of the material in one day reaches 25-30 MPa, the compressive strength in three days reaches 30-35 MPa, the compressive strength in seven days reaches 35-40 MPa, the compressive strength in 28 days reaches 45-50 MPa, the initial fluidity and the 30min fluidity meet the standard requirements, and the expansion rate is 0.1%. The concrete is completely prepared from industrial solid wastes, does not contain cement clinker, has excellent volume stability and durability, is suitable for repairing roads, bridges and building structures, and is particularly suitable for severe environments such as high humidity, salt mist, freeze thawing and the like.

The invention relates to the technical field of soft light bricks, in particular to an environment-friendly wear-resistant soft light brick and a preparation method thereof, and the environment-friendly wear-resistant soft light brick comprises the following components in parts by mass: 20-40 parts of quartz, 30-60 parts of waste slag micro powder, 10-25 parts of feldspar, 10-20 parts of kaolin, 5-15 parts of clay, 5-15 parts of talc, 5-15 parts of lamellar alumina, 1-5 parts of a sintering aid and 0.5-3 parts of a binder. According to the environment-friendly and wear-resistant soft light brick and the preparation method thereof, the waste slag micro powder and the lamellar alumina are combined with other components, a traditional single aggregate reinforcing mechanism is broken through, a two-time sintering process is used during preparation, a glaze surface and a green body are combined more firmly, the surface texture is more uniform, and the soft light effect controllability is high.

The present invention discloses a formula for high-temperature lightweight mullite bricks and a firing process thereof, relating to the technical field of refractory materials. According to the invention, by weight, the following components are included: 40-44 parts of alumina, 18-24 parts of cyanite, 10-15 parts of soft clay, 18-23 parts of high-temperature mullite, 25-35 parts of sawdust, 15-23 parts of burn-out polyethylene balls and a reinforcing agent; the sawdust is used to form microscopic air channels and reinforce the pores; the sintering temperature of the mixture is 1200°C-1800°C; the reinforcing agent is quartz powder; to solve the problem of the low strength of the lightweight heat-insulating refractory materials prepared by the burn-out method.

The invention discloses an enhanced high-temperature wear-resistant refractory castable. Comprising the following raw materials in parts by weight: 84.5 to 93.6 parts of high bauxite, 21.4 to 25.3 parts of andalusite, 32.5 to 37.8 parts of silicon oxide micro powder, 23.8 to 26.2 parts of silicon nitride micro powder, 6.8 to 9.2 parts of aluminum triphosphate, 6.3 to 10.5 parts of aluminum oxide micro powder, 1.5 to 3.2 parts of attapulgite clay, 11.5 to 22.4 parts of calcium aluminate cement, 15.6 to 18.4 parts of modified short-cut basalt fiber, 5.7 to 6.5 parts of a water reducing agent and 1.5 to 3.2 parts of silica sol. The invention also discloses a preparation method of the enhanced high-temperature wear-resistant refractory castable. The high bauxite and the andalusite are combined as the aggregate, the weight and the heat conductivity of the castable are reduced, the strength of the castable is improved, the modified chopped basalt fiber has the advantages of light volume weight, high temperature resistance, good heat stability, low heat conductivity, small heat capacity, good mechanical vibration resistance, small thermal expansion and good heat insulation performance, and the compactness of the castable is further enhanced.

The invention belongs to the technical field of EBSD sample preparation of heterogeneous materials, and particularly relates to an EBSD sample preparation method of an Al7075 / Al6061 bimetal composite cast ingot. According to the method, mechanical grinding and polishing and argon ion polishing are combined for EBSD sample preparation, during mechanical grinding and polishing, aluminum oxide polishing paste is selected for rough polishing, aluminum oxide or chromium oxide polishing paste is selected for fine polishing, and finally cerium oxide polishing paste is selected for fine polishing, so that crystal lattices with complete and distortionless sample surface layers are obtained as far as possible, and the defects such as trailing are reduced to the maximum extent; the optimal surface characteristics are provided for subsequent argon ion polishing, and meanwhile, the calibration rate of an Al7075 / Al6061 bimetal composite cast ingot EBSD sample prepared through the method is not lower than 90% in combination with the optimal argon ion polishing process parameters.

The invention relates to the technical field of suspension roasting, in particular to a flowing suspension roasting system and method for desiliconizing and purifying coal gangue. The system comprises a multi-stage preheating unit, a multi-stage cooling unit, a flowing suspension roasting furnace and a crystal form control device which are connected in sequence, and the method comprises the steps that coal gangue materials are subjected to multi-stage preheating, so that the materials are heated in stages; performing high-temperature roasting in a flowing suspension roasting furnace, and controlling the retention time of the material and the environment temperature in a crystal form control device so as to regulate and control the crystal form structure of the material. By accurately controlling the roasting process and optimizing material crystal form transformation, efficient removal of silicon in the coal gangue and efficient extraction of aluminum oxide are achieved, and the method has the advantages of being low in energy consumption, high in efficiency and good in environment friendliness and is suitable for large-scale industrial production.

The invention discloses a manufacturing method of a small-spacing lamp panel. The manufacturing method comprises the following steps: pressing; drilling is conducted, specifically, through holes are mechanically drilled, and the hole diameter is 0.2-0.3 mm; copper deposition: the thickness of a hole wall copper plating layer is 0.3-0.5 [mu] m; electroplating through holes, wherein the copper thickness in the holes is greater than or equal to 18 microns; the through holes are filled with epoxy resin with the shrinkage rate smaller than 0.5%, and curing is conducted; ceramic board grinding is conducted, an aluminum oxide ceramic grinding wheel is adopted for board grinding, the resin surface in the hole is flush with the surface of the outer layer copper foil of the multi-layer circuit board, the surface roughness Ra is smaller than 0.1 micrometer, and board grinding technological parameters are as follows: the pressure is 5-8 N / cm < 2 >, the rotating speed is 200-300 rpm, and the linear speed is 1-2 m / min; secondary copper deposition: copper deposition is carried out on the surface of the hole plugging resin to form a copper plating layer, and the thickness of the copper plating layer is 0.3-0.5 [mu] m; the whole board is electroplated, and the copper thickness on the resin is larger than or equal to 12 micrometers; and manufacturing an outer-layer circuit. The manufacturing method of the small-spacing lamp panel has the advantages of being low in cost, high in yield, simple in process and the like.

The invention relates to the technical field of ceramics, and discloses a high-strength anti-cracking ceramic and a preparation method thereof. According to the ceramic, through innovative material modification and process optimization, the strength and crack resistance of traditional ceramic are remarkably improved. The preparation method comprises the following steps: firstly, carrying out surface modification on nano titanium dioxide by using double-end carboxyl polyquaternium to obtain polyquaternium modified titanium dioxide; mixing and ball-milling quartz, clay, feldspar, aluminum oxide, talcum powder, modified titanium dioxide and other raw materials, molding and sintering to obtain the ceramic. Through the interface modification effect of the double-end carboxyl polyquaternium, the nano titanium dioxide is uniformly dispersed and firmly combined with a matrix, crack propagation is effectively hindered, and the obtained ceramic has excellent bending strength and compressive strength, widens the application field of ceramic products and has wide market application prospects.

A method for manufacturing a reinforced aluminum mirror for vacuum ultraviolet (VUV) optical elements includes a step of depositing a reflective coating made of aluminum metal on at least one surface of a substrate by physical vapor deposition (PVD) to produce a mirror having the substrate and the reflective coating. This method further includes a step of removing aluminum oxide from the outer surface of the reflective coating by performing atomic layer etching (ALE) within an atomic layer deposition (ALD) system to produce an etched surface of the reflective coating, and a step of depositing an ALD protective layer on the etched surface of the reflective coating by performing atomic layer deposition within the ALD system to produce the reinforced aluminum mirror. This reinforced aluminum mirror comprises a substrate, a reflective coating deposited on the substrate, and an ALD protective layer covering the etched surface of the reflective coating.

The invention relates to the technical field of ceramic-based composite material preparation, in particular to an aluminum oxide-based refractory ceramic composite material and a preparation method thereof.The aluminum oxide-based refractory ceramic composite material is prepared from, by mass, 80-90 parts of modified aluminum oxide, 5-10 parts of modified nano zirconium oxide suspension liquid and 3-5 parts of nano titanium dioxide sol, according to the invention, material component modification, interface structure design and gradient protection technology are optimized, compatibility of a matrix and a reinforced phase is cooperatively regulated and controlled, and low-temperature presintering and surface functionalization treatment technologies are improved, so that thermal shock resistance stability, high-temperature strength retention rate and chemical erosion resistance of the material are improved; the refractory material has excellent durability, provides a new solution for high-performance and engineering application of the refractory material, and has a wide application prospect.

The invention discloses a copper base-copper chromium contact composite material and a preparation method thereof, and belongs to the technical field of copper chromium contact materials. The preparation method comprises the following steps that a nanometer aluminum oxide coating layer is formed on the surface of chromium powder through a sol-gel method, and coated chromium powder is obtained; the coated chromium powder and the copper powder are subjected to vacuum induction gas atomization treatment, and spherical copper-chromium alloy powder is obtained; the spherical copper-chromium alloy powder is printed on the surface of the copper-based material, and a prefabricated body of the copper-based-copper-chromium contact composite material is obtained; and after the contact layer is subjected to hot isostatic pressing treatment, the prefabricated body is subjected to annealing treatment, and the contact is prepared. According to the method, the high conductivity of the base material and the high wear resistance of the contact layer can be coordinated, so that the arc ablation resistance is improved; through the combination of electron beam printing and hot isostatic pressing, the porosity of the material can be remarkably reduced, and the material is suitable for high-performance contact components in the fields of high-voltage switches, rail transit and the like.

The invention relates to the field of insulators, in particular to an anti-pollution flashover ceramic insulator and a preparation method thereof. The glaze layer is prepared from the following raw materials in parts by weight: 40-50 parts of potassium feldspar, 10-15 parts of Suzhou clay, 10-15 parts of calcite, 15-20 parts of quartz, 1-5 parts of aluminum oxide, 1-5 parts of magnesium oxide and 5-10 parts of modified halloysite nanotubes; the ceramic insulator is characterized in that a modified halloysite nanotube is loaded with a dialkyl dithiocarbamic acid metal salt-amino triazine copolymer, the glaze layer is the key for long-term use of the ceramic insulator in a severe environment, and the ceramic insulator is endowed with certain antifouling performance and photocatalytic performance, so that the service life of the insulator is prolonged, the service life of the ceramic insulator is prolonged, and the service life of the ceramic insulator is prolonged. The safe and stable operation of the power transmission line is ensured, and the maintenance cost of line operation is reduced.

The invention relates to the technical field of transportation equipment, in particular to an aluminum oxide production raw material conveying assembly which comprises a main conveying belt and an auxiliary conveying belt which are obliquely installed in an attached mode through a supporting assembly. The main conveying belt is located at the bottom and used for conveying crushed bauxite to the screening machine, and the auxiliary conveying belt is located at the top and used for receiving and returning over-specification materials separated by the screening machine and serves as a dustproof mechanism to cover the main conveying belt. Side eaves plates are arranged on the main conveying belt and the auxiliary conveying belt, and main push plates and auxiliary push plates are arranged on the side eaves plates of the main conveying belt and the auxiliary conveying belt at intervals; the auxiliary push plate is of a hollow structure, guide grooves are formed in the two sides of the auxiliary push plate, a pop-up sealing plate is installed in the guide grooves through a support, and the bottom of the support is connected with a pop-up piece. A magnetic base is arranged at the bottom of the auxiliary conveying belt, and when the auxiliary pushing plate rotates to the position attached to the main pushing plate along with the auxiliary conveying belt, the magnetic base triggers the closing plate to pop out and be in sealed connection with the two sides of the main pushing plate; the purpose of dynamically sealing to reduce flying dust during bauxite conveying is achieved.