18 results about "Gel casting" patented technology

This application relates to a preparation mold and method for gel casting of reaction-bonded silicon carbide barrels, belonging to the field of silicon carbide product technology. It includes an inner cylinder, an outer tube, and an outer cylinder. The outer tube is sleeved outside the inner cylinder. One end of the inner cylinder extends out of the outer tube and is connected to a first base plate. The outer tube abuts against the surface of the first base plate. A first molding cavity is formed between the inner wall of the outer tube and the outer wall of the inner cylinder. The first molding cavity is used for pouring paraffin wax and forming the inner barrel mold. The inner diameter of the outer cylinder is larger than the diameter of the inner barrel mold. A second base plate is provided on the inner wall of one end of the outer cylinder. After the inner barrel mold is inserted into the outer cylinder, it abuts against the second base plate. A second molding cavity is formed between the inner wall of the outer cylinder and the outer wall of the inner barrel mold. The second molding cavity is used for pouring gel-based sauce and forming the silicon carbide barrel blank. This application has the effect of improving the removal efficiency of the inner mold and the forming quality of the inner wall of the silicon carbide barrel blank in the gel casting process.

The invention provides an aerogel production assembly that includes a mold with a mold base defined by a casting substrate, where the casting substrate includes a film. The invention also provides an aerogel production method that involves filling such a mold with a wet gel precursor solution. In other embodiments, the invention provides an aerogel production assembly that includes a film and a film handling system. In still other embodiments, the invention provides an aerogel production assembly that includes an advantageous aging clamp mechanism. Further, some embodiments of the invention provide an aerogel production method that involves a wet gel sheet casted to a casting substrate, where the casting substrate includes a film, and the method includes both peeling the film off the wet gel sheet and conveying the wet gel sheet onto a drying substrate.

This invention relates to the field of membrane materials technology, specifically to a biaxially stretched polyolefin film, its preparation process, and its applications. This invention solves the problem of uneven microstructure caused by non-uniform preheating and stretching of thick gel castings in existing technologies through a specific heat-setting process. It provides a gel film precursor with uniform three-dimensional properties (i.e., along the film production line's forward direction, width direction, and thickness direction) for subsequent stretching, thereby obtaining a microporous membrane with narrower pore size distribution and a more regular structure. It also solves the problem of the limiting stretching ratio restricted by the accumulation of stress within the connecting chains in existing stretching processes. By relaxing stress and widening the process safety window, it enables higher-ratio uniform biaxial stretching, thereby improving the final mechanical strength (such as tensile strength) and air permeability of the microporous membrane.

The invention discloses a method for preparing a honeycomb porous wafer thinned grinding wheel based on an in-situ gel casting method, which comprises the following steps of: placing superfine diamond micro-powder in an acidic strong oxidizing solution, heating, centrifugally cleaning until the superfine diamond micro-powder is neutral, and drying to obtain pre-oxidized diamond micro-powder; adding the modified diamond micro-powder into a silane coupling agent solution for grafting reaction to obtain modified diamond micro-powder; the method comprises the following steps: dissolving an organic monomer and a cross-linking agent in deionized water according to a predetermined mass ratio, and stirring to obtain an organic monomer premixed solution; adding microcrystalline glass binder powder, a polymeric dispersant and modified diamond micro-powder into the organic monomer premixed liquid, and carrying out dispersion treatment to obtain high-solid-content ceramic slurry; adding a macroporous pore-forming agent into the ceramic slurry, stirring, fully discharging bubbles, adding an initiator and a catalyst, pouring into a forming mold, carrying out in-situ polymerization reaction on organic monomers to form a gel network, and further forming a wet blank; and the wet blank is dried, degummed and sintered to obtain the grinding wheel block with the honeycomb structure. And cutting the honeycomb-structure grinding wheel blocks, and pasting the honeycomb-structure grinding wheel blocks in the grooves of the grinding wheel base body in an array manner to form the honeycomb porous wafer thinning grinding wheel. The problem of agglomeration of the ultrafine diamond powder is solved, and the bending strength of the prepared grinding wheel can be improved while the high porosity is guaranteed.

The invention provides a zirconia porcelain block based on gel casting, a preparation method and application. Comprising the following steps: injecting mixed slurry into a mold, adding an initiator and a catalyst in the injection process until the mixture is completely cured, demolding, and then carrying out drying and glue discharging treatment to obtain a glue-discharged green body; and carrying out mechanical processing on the degummed green body, and then carrying out rapid sintering to obtain the zirconium oxide porcelain block. Wherein the mixed slurry comprises a precursor solution and inorganic powder; the precursor solution comprises one or more of polyvinyl alcohol, chitosan and polyacrylic acid; the inorganic powder comprises the following components in parts by mass: 85-94 parts of zirconium oxide, 2-10 parts of yttrium oxide, 2-5 parts of hafnium oxide, 2-5 parts of aluminum oxide and 1-5 parts of other inorganic oxides. The preparation method disclosed by the invention is simple, convenient to operate, low in cost and easy for large-scale production and application.

The invention provides an aerogel production assembly that includes a mold with a mold base defined by a casting substrate, where the casting substrate includes a film. The invention also provides an aerogel production method that involves filling such a mold with a wet gel precursor solution. In other embodiments, the invention provides an aerogel production assembly that includes a film and a film handling system. In still other embodiments, the invention provides an aerogel production assembly that includes an advantageous aging clamp mechanism. Further, some embodiments of the invention provide an aerogel production method that involves a wet gel sheet casted to a casting substrate, where the casting substrate includes a film, and the method includes both peeling the film off the wet gel sheet and conveying the wet gel sheet onto a drying substrate.

The invention relates to the field of sheet ceramic production, in particular to an energy-saving type water-based gel casting continuous forming device for sheet ceramics, one side of a roller frame is provided with an extruder, the other side of the roller frame is provided with a plurality of groups of rotatable winding drums through a support frame, one side far away from the winding drums is provided with a guide roller, and an execution roller is slidably mounted below the guide roller; and the strip-shaped film is sequentially wound on the guide roller, the execution roller and the winding drum. According to the film cutting device, the winding drum structure can excite the oil cylinder structure to stretch out the film inserting knife in the rotary material changing process, so that a film body is cut while being inserted into an empty roll, and the film body is compacted through the execution roller reset clockwise to guarantee the subsequent winding stability; and process defects and energy waste caused by traditional shutdown roll replacement can be avoided while non-shutdown roll replacement is realized.

This invention belongs to the field of ceramic refractory materials technology, specifically relating to a method for preparing an aluminosilicate fiber crucible with an anti-erosion coating, the crucible itself, and its applications. The method involves using aluminosilicate ceramic fibers, a solvent, organic monomers, and a crosslinking agent, followed by gel casting in a mold to form a three-dimensional skeleton structure of the aluminosilicate ceramic fibers. After drying and sintering, an aluminosilicate ceramic fiber crucible matrix is ​​obtained. A coating slurry is prepared using multi-stage Y₂O₃ powder and two grinding balls of different diameters. This slurry is then coated onto the inside of the aluminosilicate ceramic fiber crucible matrix. Finally, a multi-stage heating process is used for sintering to obtain an aluminosilicate fiber crucible with an anti-erosion coating. This invention improves the crucible's strength through gel casting and enhances its resistance to melt erosion by coating the inner wall of the crucible with a yttrium oxide coating, thus preventing interfacial reactions between the crucible and the melt.

This invention relates to a catalytic material and its preparation method, addressing the problems of low design freedom in existing catalytic material preparation methods and competitive ultraviolet energy absorption between the catalyst and photosensitive resin during photopolymerization 3D printing. The preparation method of the catalytic material in this invention includes the following steps: S1, preparing a calcium oxide sacrificial mold using photopolymerization 3D printing; S2, preparing a catalyst-epoxy resin slurry; S3, gel casting: adding a curing agent to the catalyst-epoxy resin slurry, then injecting it into the calcium oxide sacrificial mold, and heating to cure to obtain a gelled wet preform; S4, demolding and drying the gelled wet preform to obtain a catalyst blank; S5, debinding and sintering the catalyst blank to obtain the catalytic material. This preparation method possesses high design freedom and realizes the preparation of catalytic materials with artificially designed ordered pore structures using catalyst slurries with high solid content.

The invention provides an aerogel production assembly that includes a mold with a mold base defined by a casting substrate, where the casting substrate includes a film. The invention also provides an aerogel production method that involves filling such a mold with a wet gel precursor solution. In other embodiments, the invention provides an aerogel production assembly that includes a film and a film handling system. In still other embodiments, the invention provides an aerogel production assembly that includes an advantageous aging clamp mechanism. Further, some embodiments of the invention provide an aerogel production method that involves a wet gel sheet casted to a casting substrate, where the casting substrate includes a film, and the method includes both peeling the film off the wet gel sheet and conveying the wet gel sheet onto a drying substrate.

The invention provides an aerogel production assembly that includes a mold with a mold base defined by a casting substrate, where the casting substrate includes a film. The invention also provides an aerogel production method that involves filling such a mold with a wet gel precursor solution. In other embodiments, the invention provides an aerogel production assembly that includes a film and a film handling system. In still other embodiments, the invention provides an aerogel production assembly that includes an advantageous aging clamp mechanism. Further, some embodiments of the invention provide an aerogel production method that involves a wet gel sheet casted to a casting substrate, where the casting substrate includes a film, and the method includes both peeling the film off the wet gel sheet and conveying the wet gel sheet onto a drying substrate.

The invention discloses a microwave dielectric filter based on an agarose-epoxy resin composite system and a preparation method of the microwave dielectric filter. Deionized water, a dispersing agent, a pH regulator and a surface modifier are taken to be prepared into a premixed liquid material, the premixed liquid material is subjected to ball milling to obtain premixed liquid, and microwave dielectric ceramic powder is added into the premixed liquid in batches to obtain slurry; carrying out ball milling on the slurry to obtain microwave dielectric ceramic slurry; deionized water, agarose powder and epoxy resin are taken to be prepared into gel, and the gel is heated, dissolved and mixed to obtain agarose-epoxy resin composite gel; mixing the microwave dielectric ceramic slurry with the agarose-epoxy resin composite gel, heating and stirring to obtain microwave dielectric ceramic slurry for gel casting, performing vacuum defoaming, injecting the microwave dielectric ceramic slurry into a microwave dielectric ceramic filter mold, putting the microwave dielectric ceramic filter mold into a constant-temperature and constant-humidity box, cooling, drying and demolding to obtain a biscuit, and performing degumming and sintering in a sintering furnace to obtain the microwave dielectric ceramic filter. The microwave dielectric filter based on the agarose-epoxy resin composite system is obtained by polishing and grinding, and the whole-process green manufacturing is realized by combining the biocompatibility of the agarose and the epoxy resin.

The utility model relates to a gel injection mold for a ceramic vacuum chuck, and effectively solves the problems that when an existing gel injection mold is applied to production of the ceramic vacuum chuck, on one hand, the sealing performance of the mold is poor, the liquid leakage phenomenon is easy to occur in the injection molding process, raw material waste is caused, the production cost is low, and the like. The forming quality of the green body is influenced, flaws and even holes appear on the surface of the sucker, and the vacuum adsorption performance is reduced; and on the other hand, the demolding design of the mold is not reasonable enough, and as the ceramic green body is tightly attached to the inner wall of the mold after gel curing, a traditional demolding mode easily causes damage to the green body. According to the ceramic vacuum chuck gel casting mold, the forming plates, the partition plates and the hydraulic rods are relatively pressed and fixed, then gaps existing between the forming plates are reduced, raw material waste is reduced, meanwhile, formed ligands are separated from the inner walls of the shaping grooves through pushing of the pushing blocks, and therefore the integrity during demolding is guaranteed.

This application relates to the technical field of superhard composite materials, specifically to a diamond-silicon carbide composite material and its preparation method using non-toxic gel casting and reactive infiltration. In this method, diamond powder and silicon carbide powder are added to a gel premix prepared using raw materials from a non-toxic gel casting system to obtain a uniformly dispersed slurry. The slurry is then degassed under vacuum to form a cast film, initiating a gelation reaction. After curing and drying, a diamond-silicon carbide cast green body is obtained. A porous preform with interconnected pores is obtained through debinding and pre-sintering. The porous preform is then contacted with silicon material via reactive infiltration, and high-temperature, pressureless infiltration is performed under vacuum to obtain a dense diamond-silicon carbide sintered body. This application achieves efficient, high-density, environmentally friendly, and near-net-shape forming of D-SiC composite materials by optimizing the non-toxic gel premix formulation, the diamond multi-scale gradation scheme, the casting process parameters, and the debinding-pre-sintering temperature window.

The invention provides an aerogel production assembly that includes a mold with a mold base defined by a casting substrate, where the casting substrate includes a film. The invention also provides an aerogel production method that involves filling such a mold with a wet gel precursor solution. In other embodiments, the invention provides an aerogel production assembly that includes a film and a film handling system. In still other embodiments, the invention provides an aerogel production assembly that includes an advantageous aging clamp mechanism. Further, some embodiments of the invention provide an aerogel production method that involves a wet gel sheet casted to a casting substrate, where the casting substrate includes a film, and the method includes both peeling the film off the wet gel sheet and conveying the wet gel sheet onto a drying substrate.

This invention discloses a method for preparing yttrium-magnesium oxide (YMO) multiphase transparent ceramics using non-aqueous gel casting, belonging to the field of ceramic preparation technology. To overcome the problems associated with water-based gel casting, this invention provides a method for preparing YMO multiphase transparent ceramics using non-aqueous gel casting, comprising: ball milling Y2O3, MgO, a dispersant, and a non-aqueous solvent; then adding epoxy resin and a curing agent and ball milling again; the resulting ceramic slurry is defoamed, cured, and dried; then subjected to debinding, sintering densification, cooling, hot isostatic pressing, annealing, and polishing to obtain the YMO multiphase transparent ceramic. This invention overcomes the difficulties in preparing large-size Y2O3-MgO nano-multiphase infrared transparent ceramics and the problem of component inhomogeneity by designing a non-aqueous solvent system and selecting a suitable gel system, and can produce complex-shaped / large-size, uniformly composed YMO nano-multiphase ceramics.

The invention provides a method for continuously preparing titanium and titanium alloy sheets in a short process, and relates to the technical field of titanium and titanium alloy sheet preparation. The method comprises the steps of raw material powder preparation, slurry preparation, plate blank forming, plate blank drying, degreasing sintering, cold rolling and aftertreatment. Wherein titanium and titanium alloy tape casting slurry is poured into a slurry tank of a tape casting machine, the slurry is conveyed to a scraper area, a thin layer is formed on a base plate through a scraper gap in a coating mode, the slurry can be cured in situ under the action of a catalyst, and a high-strength titanium and titanium alloy plate blank is formed. The technological processes of gel tape casting, degreasing sintering and cold rolling are matched with continuous production equipment, the high-temperature melting process and the complex procedures of multi-pass hot rolling-cold rolling of a traditional casting-rolling technology are effectively avoided, short-process continuous controllable preparation of the titanium and titanium alloy thin plate is achieved, the flexibility of design of components, thickness and width is high, and the production efficiency is high. The catalyst has the advantages of strong stability, wide application, low cost and excellent performance, and is suitable for large-scale industrial production.

This invention relates to a method for preparing a collapsible, high-strength composite ceramic core for hot isostatic pressing, comprising the following steps: S1: preparing a skeleton ceramic slurry; S2: designing a three-dimensional model of the core skeleton according to the required core structure; S3: forming a collapsible ceramic skeleton using 3D printing technology based on the pre-designed three-dimensional model of the core skeleton; S4: preparing a matrix ceramic slurry; S5: combining the ceramic skeleton with the ceramic matrix using a gel casting process, filling the voids in the ceramic skeleton with the matrix ceramic slurry prepared in step S4, and gel-setting to obtain a ceramic core green body; S6: drying, degreasing, sintering, and post-treatment to obtain the desired ceramic core. The ceramic core prepared by this method provides support for the ceramic matrix through the ceramic skeleton, exhibits good mechanical properties, and is suitable for the high-temperature and high-pressure working environment of hot isostatic pressing. During core corrosion and core removal, the ceramic skeleton can be easily removed, and the ceramic matrix falls off on its own after losing support, demonstrating excellent core removal performance.