21 results about "Aluminum Oxide Paste" patented technology

The invention belongs to the field of functional composite materials, and particularly relates to low-viscosity and high-dispersity aluminum oxide slurry and a preparation method thereof.The low-viscosity and high-dispersity aluminum oxide slurry is prepared from a newly-designed phosphono-carboxyl block copolymer and biquaternary ammonium salt polyether silane as composite modifiers; and efficient anchoring and stable dispersion of the surfaces of alumina particles are realized through the synergistic effect of molecular structures. The phosphono-carboxyl block copolymer is prepared through controllable polymerization and deprotection reaction, and strong chemical bonding is formed between a phosphono group and the surface of aluminum oxide; the biquaternary ammonium salt polyether silane is subjected to click chemical synthesis, and electrostatic adsorption of quaternary ammonium salt and the steric hindrance effect of a polyether chain are combined. When the slurry is prepared, the two modifiers are sequentially added into water, the aluminum oxide powder is added after the pH value is adjusted, finally, the isobutylene maleic anhydride copolymer and the defoaming agent are introduced, and the slurry is obtained through vacuum defoaming and filtering. The slurry prepared by the method has the characteristics of high solid content, low viscosity and good dispersion stability.

The invention discloses polishing powder for an automobile paint surface and a preparation method of the polishing powder. The preparation method comprises the following steps: preparing a mixed solution; preparing a roasting material from the mixed solution and pseudo-boehmite, wherein the specific surface area of the roasting material is 30-60m < 2 > / g; grinding the roasted material to obtain aluminum oxide slurry; adding a coupling agent and a dispersing agent into the aluminum oxide slurry, and reacting under a stirring condition to prepare mixed slurry; and carrying out post-treatment on the mixed slurry to obtain the polishing powder of which the particle size distribution D50 is in a range of 0.6-0.9 mu m and the particle size distribution D100 is less than 10 mu m. According to the preparation method of the polishing powder, the prepared polishing powder has good polishing performance, the surface smoothness of a polished automobile paint surface is improved, the polishing powder is easy to store and transport, and the production cost can be effectively reduced.

The invention provides a high-temperature-resistant and low-water-absorption lithium battery diaphragm and a preparation method thereof. The diaphragm is prepared by coating double surfaces or single surface of a base membrane with coating slurry, wherein the coating slurry is mainly prepared by mixing nano calcium stearate and aluminum oxide in a mass ratio of (25-38): (40-55). According to the preparation method, the surface of the base membrane is coated with a layer of aluminum oxide slurry treated by a special process, and meanwhile, the heat resistance of the diaphragm is remarkably enhanced by optimizing the raw material ratio of the coating slurry and the process flow. The coating slurry not only endows the diaphragm with excellent hydrophobic characteristics and effectively reduces the absorption of moisture, but also can maintain extremely low moisture content under extreme environmental conditions, thereby ensuring that the moisture content of the diaphragm is continuously in a low-level state. The innovative method provides a new technical approach for improving the performance of the lithium ion battery diaphragm.

This invention provides a multilayer coated low-temperature carbon capture material, its preparation method, and its application. The preparation method employs a four-layer sandwich multilayer coating process: a mixed slurry-alumina slurry-mixed slurry-alumina slurry. A mixed slurry coating (active layer), an alumina slurry coating (bonding transition layer), a mixed slurry (active layer), and an alumina slurry (protective layer) are sequentially formed on the surface of a porous honeycomb carrier. The transition layer and protective layer formed by the alumina slurry enhance the bonding strength between the active ingredient (potassium carbonate) and the carrier, while preventing the active ingredient from directly contacting external moisture, reducing potassium carbonate shedding during cycling, and ensuring stable carbon capture performance during multiple adsorption-desorption cycles. The multilayer thin-coating method ensures the effective loading of the active ingredient and avoids cracking and peeling caused by excessive internal stress in thick coatings, thus improving the overall stability of the coating.

There is provided a method for producing a coated substrate, the method comprising: forming an aluminium (oxy) hydroxide slurry by simultaneously feeding streams of an aluminium nitrate solution and a basic solution, such as an ammonia solution, into a liquid over a reaction period, while maintaining an elevated temperature and a controlled pH; allowing a substrate to contact the slurry to thereby form an aluminium (oxy) hydroxide coating on the substrate; separating the coated substrate from the liquid.

The utility model provides an aluminum hydroxide slurry grading device which comprises a base, a swirler and an electric rotary table, supporting plates are fixedly installed on the two sides of the top of the base, and a fixing plate is jointly installed on the tops of the two supporting plates. Compared with the prior art, the aluminum hydroxide slurry defoaming device has the following beneficial effects that aluminum hydroxide slurry is conveyed into the electric heating copper pipe through the liquid inlet pipe, the electric heating copper pipe is started to heat and defoam the slurry, and the heated and defoamed slurry is uniformly conveyed into the liquid conveying pipes through the bent pipes; due to the fact that the end, located in the swirler, of each liquid conveying pipe is in the bent shape, and the end opening faces the inner wall of the swirler, when the slurry is conveyed into the swirler, the slurry can flow along the inner wall of the swirler, a large number of bubbles cannot be generated, and the phenomenon that particles in the slurry are wrapped by the bubbles, and consequently the slurry particles are separated unevenly is reduced; and the grading effect of the aluminum hydroxide slurry is effectively improved.

The invention provides a high-dispersion noble metal catalyst and a preparation method and application thereof. The high-dispersion noble metal catalyst is prepared from aluminum oxide slurry, the concentration of aluminum oxide in the aluminum oxide slurry is 25-35 wt%, the particle size of the aluminum oxide in the aluminum oxide slurry is 0.5-20 microns, the D50 of the aluminum oxide in the aluminum oxide slurry is 4-6 microns, and the D90 of the aluminum oxide in the aluminum oxide slurry is smaller than or equal to 10 microns; the aluminum oxide is gamma aluminum oxide, and a solution in the aluminum oxide slurry is water. In the preparation process of the noble metal catalyst, the dispersity of the noble metal is remarkably improved, sintering of the alumina carrier and agglomeration of the noble metal are reduced, and the activity and thermal stability of the catalyst are improved. Meanwhile, the consistency of the product is improved through particle size regulation and control in the preparation process, and the method has a good industrial application prospect.

The invention discloses diamond reinforced alumina slurry suitable for DLP printing and a preparation method thereof.The slurry is grafted with modified diamond particles through a coupling agent and a polymer, polar groups such as hydroxyl groups and epoxy groups are introduced to the surfaces of the diamond particles through hydrolysis and combination reactions, and the interface bonding force with alumina particles is enhanced; the problem of interfacial compatibility of diamond particles and aluminum oxide is solved, uniform dispersion of the particles and resin is ensured by adopting a three-step composite dispersion process, namely a ball milling-vacuum stirring composite dispersion process, the overall uniformity of the diamond-enhanced aluminum oxide slurry is ensured by adopting a vacuum homogenizer, and the obtained slurry is moderate in viscosity, high in light curing speed and high in strength. The printed and formed ceramic part has excellent mechanical property and wear resistance after being sintered, and is suitable for rapid manufacturing of high-precision complex ceramic parts.

This invention discloses a method for preparing high-purity ceramic sheets for electrostatic chucks, belonging to the field of electrostatic chuck technology, including the following steps: Step S1: Preparing high-purity alumina slurry by mixing and grinding high-purity alumina micro powder, composite organic carrier, and dispersant, then adding plasticizer and continuing grinding; Step S2: Vacuum treatment and degassing of the slurry by vacuum degassing; Step S3: Casting and molding by casting the high-purity alumina slurry to obtain alumina cast blank sheet; Step S4: Processing the cast blank sheet by drilling holes in the alumina cast blank sheet; Step S5: Lower lamination by hot pressing the hole-processed alumina cast blank sheet; Step S6: Screen printing by screen printing on the hole-processed alumina cast blank sheet; Step S7: Overall hot pressing and lamination by hot pressing the lower hot pressing layer and the screen-printed alumina cast blank sheet; Step S8: Sintering by first removing the binder and then sintering.

The invention discloses a preparation method of micro-particle high-purity ceramic for an electrostatic chuck, and belongs to the technical field of electrostatic chucks. The preparation method comprises the following steps: S1, preparing high-purity aluminum oxide slurry; s2, carrying out defoaming treatment and aging on the slurry; s3, carrying out tape casting, and then drying to obtain an aluminum oxide tape casting blank piece; s4, hole machining; s5, performing lower hot-pressing lamination on the aluminum oxide tape-casting blank sheet subjected to hole processing; s6, carrying out silk-screen printing on the aluminum oxide tape-casting blank sheet; s7, performing integral hot-pressing lamination on the lower hot-pressing lamination and the aluminum oxide tape-casting blank sheet subjected to silk-screen printing to obtain an aluminum oxide blank sheet; and S8, the aluminum oxide blank piece is subjected to glue discharging and sintering, and the high-purity aluminum oxide ceramic piece for the electrostatic chuck is obtained.

The present application relates to the field of ceramics, and particularly to a high-temperature-resistant black colorant suitable for advanced ceramics, a preparation method and applications thereof, wherein the components of the high-temperature-resistant black colorant include, by mass ratio, 15-25% of Co3O4, 8-15% of Cr2O3, 2-5% of MnO2, 3-8% of SiO2, and 40-60% of Al2O3. The present application realizes the thermal expansion coefficient coordination of the colorant and the alumina matrix by introducing a combination of transition metal oxides matching the alumina lattice, thereby inhibiting cracking or peeling caused by interface stress. A composite doping strategy is adopted to make coloring ions (such as Co 2+ , Cr 3+ ) enter the interstitial space of the alumina lattice to form a stable solid solution structure, thereby significantly improving the color stability at high temperatures. Wet ball milling combined with surface modification is used to ensure uniform dispersion of the colorant particles in the alumina slurry and avoid color spot defects caused by agglomeration.

The application provides a method for 3D printing of a multi-layer heterogeneous ceramic mold shell for titanium alloy casting, which comprises the following steps: dividing a three-dimensional model of the ceramic mold shell into a surface layer, an adjacent surface layer and a back layer, and connecting the surface layer and the back layer through the adjacent surface layer; according to the three-dimensional model, simultaneously extruding and forming the surface layer, the back layer and the adjacent surface layer by using multiple barrels respectively filled with yttrium oxide slurry, aluminum oxide slurry and mixed slurry of yttrium oxide and zirconium oxide, so as to obtain an integrated mold shell; and drying, degreasing, sintering and post-processing the mold shell, so as to obtain a ceramic mold shell for titanium alloy casting. In conclusion, the ceramic mold shell is divided into the surface layer, the adjacent surface layer and the back layer, multiple barrels are used for synchronous cooperation, and multiple modeling materials with different particle sizes are extruded layer by layer to print different areas of the ceramic mold shell, so that an integrated multi-layer composite ceramic mold shell with high surface precision, high surface inertness and high strength is obtained.

The invention relates to high-solid-content aluminum oxide slurry which comprises 65-80 wt% of aluminum oxide powder, 1-3 wt% of a dispersing agent and 5-30 wt% of a solvent. The particle size D50 of the alumina powder is 200-600 nm, the particle size D90 of the alumina powder is 0.8-2 [mu] m, and the specific surface area BET of the alumina powder is 4-15 m < 2 > / g; the dispersing agent is a combination of dispersing agents containing ester groups, phosphate groups and polyoxyethylene structures; the viscosity of the aluminum oxide slurry with high solid content is 3000 to 10000 cp. The composite dispersing agent is prepared through the synergistic effect of functional groups in the dispersing agent containing an ester group, a phosphate group and a polyoxyethylene structure, good dispersity in slurry with the aluminum oxide powder content as high as 65-80 wt% is achieved, and finally the aluminum oxide ceramic material which is small in grain size, high in density and excellent in Vickers hardness and dielectric property is prepared.

The invention relates to a preparation method of a ceramic hollow fiber membrane, in particular to a preparation method of a DLP 3D printing high-energy-density aluminum oxide ceramic hollow fiber membrane, and the method comprises the following steps: preparing and modifying the particle size grading of aluminum oxide slurry, performing 3D Max modeling and Comsol simulation of a multi-tube spiral winding hollow fiber membrane, performing DLP 3D printing, and degreasing and sintering a printing device, so as to obtain the DLP 3D printing high-energy-density aluminum oxide ceramic hollow fiber membrane. And realizing characterization of the slurry and the device. Wherein the slurry is prepared by mixing aluminum oxide powder of 5 microns, 0.2 microns and 60 microns, and carrying out ball milling, centrifugation and other treatments; 3D Max software, Comsol simulation and DLP (Digital Light Processing) equipment are used for modeling and printing; according to the method, the bottleneck of a traditional process is broken through, micron-sized forming is achieved through high precision of DLP 3D printing, the structure is simulated and optimized in combination with 3D Max and Comsol, the working reaction efficiency is improved, the self-supporting mechanical strength is improved, the toughness is improved, the service life of a device is prolonged, and the high requirements of the fields of hydrogen-helium separation, aerospace and the like for high-performance membrane materials can be met.

The invention relates to the technical field of composite materials, in particular to an alumina fiber prepreg capable of being stored for a long time as well as a preparation method and an application method thereof. The invention provides a preparation method of an alumina fiber prepreg capable of being stored for a long time, which comprises the following steps: uniformly mixing a water-based solution and nano alumina powder to prepare alumina slurry; wherein the water-based solution comprises deionized water, a binding agent and a dispersing agent; uniformly brushing the aluminum oxide slurry on the surface of an aluminum oxide fiber fabric, airing and storing. According to the prepreg prepared by the invention, a stable slurry can be formed by mixing and ball-milling an aqueous solution and alumina powder, and the prepreg which can be stored for a long time can be obtained by brushing fiber cloth and then drying. During use, the adhesive property can be recovered by only carrying out reactivation treatment, and the continuous alumina fiber reinforced alumina ceramic-based composite material is prepared through a layer paving-hot pressing process. The method solves the problem of poor storage stability of the alumina fiber prepreg, and also shortens the preparation period.

The utility model discloses a drying device for aluminum oxide production, which comprises a pumping assembly, an atomizing assembly, a drying tower, a distribution assembly and a drying assembly which are sequentially connected, the pumping assembly is used for uniformly pumping aluminum oxide slurry to provide power, the atomizing assembly is used for atomizing high-pressure slurry into fine fog drops, and the drying assembly is used for drying the high-pressure slurry. The discharging end of the atomization assembly longitudinally extends into the drying chamber; the distribution assembly is used for uniformly distributing aluminum oxide slurry, the drying assembly is used for drying moisture in the slurry, and the discharging part of the atomization assembly, the distribution assembly and the drying assembly are sequentially arranged in the drying tower from top to bottom. High-pressure slurry is atomized by the atomization assembly, uniformly distributed by the distribution assembly and dried by the drying assembly, the slurry is uniformly distributed twice by the atomization assembly and the distribution assembly, and heat waste is reduced when the uniformly distributed slurry is dried.

The utility model discloses a filter for alumina production, which relates to the technical field of alumina dehydration and comprises a support frame, a feeding mechanism is arranged on the outer surface of the support frame, and a filtering mechanism is arranged on the inner wall of the support frame. The stirring shaft drives the poke rod to rotate, the poke rod pokes the baffle in the rotating process, at the moment, the baffle can drive the guide rod to move in the direction of the spring, the bottom of the discharging barrel is opened while the spring is extruded, and kieselguhr in the discharging barrel falls into aluminum oxide; therefore, the diatomite can be gradually added into the aluminum oxide while stirring, so that the diatomite and the aluminum oxide are mixed more uniformly, and the uniformly mixed diatomite can be in better contact with water in the aluminum oxide slurry, so that the water can be separated from the aluminum oxide slurry more quickly.

The invention belongs to the technical field of aluminum oxide production, and particularly relates to a settling separation device for aluminum oxide production, which comprises a settling tank, a driving pipe is rotatably arranged at the top of the settling tank in a penetrating manner, an inner spiral stirring pipe is mounted on the outer surface of the driving pipe, and an outer spiral heating pipe fixedly sleeves the outer part of the settling tank. A driving assembly works to drive a driving pipe to rotate, an inner spiral stirring pipe rotates to drive a flocculating agent and aluminum oxide slurry to be stirred, a heating assembly heats the inner spiral stirring pipe and an outer spiral heating pipe during stirring, the inner spiral stirring pipe heats the interior of a settling tank, and the outer spiral stirring pipe heats the interior of the settling tank; the outer spiral heating pipe heats the outside of the settling tank, and meanwhile, during working, the circulating conveying assembly conveys aluminum oxide slurry in the settling tank to the inner top of the settling tank again from the bottom, so that internal and external heating, stirring and circulating conveying of the aluminum oxide slurry are matched, and the mixing efficiency of a flocculating agent and the aluminum oxide slurry can be improved.

A waterproof and heat-insulating alumina coating, its preparation method, and its application are disclosed, relating to the field of coating materials technology. This invention solves the problem that existing protective coating materials cannot meet the interfacial bonding strength and thermomechanical stability requirements of high-precision chips for dense coatings. The coating comprises a loose, porous alumina paste A and a relatively dense alumina paste B. A printing process is used to print alumina paste A onto the surface of a chip preform and then dry it; alumina paste A is the first layer, sintered at high temperature. Alumina paste B is then printed onto the surface of the chip preform with the alumina coating A and dried; alumina paste B is the second layer, sintered at low temperature. This invention can be applied to the protection of zirconia ceramic chips in nitrogen and oxygen sensors and has broad application prospects.

The application discloses a preparation method of solid spherical alumina granulation powder, wherein specific anion surface active dispersants are added first to disperse and mix alumina powder and sintering aids, specific cation surface active dispersants are added later to neutralize the surface charge of the anion surface active dispersants, alumina slurry is obtained, and finally, the solid spherical alumina granulation powder is obtained through spray granulation. Through the preparation method, the uniformity of the mixture of the alumina powder and the sintering aids can be ensured, and the alumina slurry can be granulated into solid spheres.