11results about How to "High green strength" patented technology

The invention discloses a method for preparing a conductive ceramic with controllable resistivity, and relates to the technical field of conductive ceramics. The invention adopts three different particle sizes of aluminum oxide, titanium nitride, and silicon dioxide to form a ceramic slurry, which reduces the possibility of deformation, and adjusts the amount of titanium nitride added to adjust the ceramic resistivity, thereby realizing the controllable resistivity of the ceramic; the invention adopts methacrylic acid glycidyl ether and starch to form a gel skeleton, and uses amino-treated nanographite sheets as a support to ensure the mechanical strength of the ceramic; the ceramic slurry is used as a core material, and then a layer of gel is wrapped around the outer layer of the core material, and a three-stage high-temperature sintering treatment is performed to optimize the strength of the ceramic, while making the zirconium ions and nickel ions doped with the gel combine with the lanthanum ions in the atomized liquid, and form a zirconium-nickel-lanthanum-carbon crystal structure under a H2O / O2 atmosphere, which greatly improves the conductivity of the gel layer, thereby forming a uniform and continuous conductive path on the surface and inside of the ceramic.

The invention belongs to the field of ceramic substrate manufacturing, and particularly relates to a ceramic substrate tape casting method based on a light-humidity dual-curing system, which comprises the following steps: S1, preparing raw materials; s2, preparing slurry; s3, adding a cross-linking agent; s4, defoaming treatment is carried out; s5, carrying out tape casting; s6, primary curing; s7, carrying out drying treatment; and S8, sintering treatment. According to the ceramic substrate tape casting method based on the light-humidity dual-curing system, ethyl acetate and butyl acetate are used as solvents and are harmless to human bodies and the environment, organic solvents such as ethyl acetate have small surface tension, capillary force caused in the drying process is small, a tape casting green body can be effectively prevented from being dried and cracked, and the service life of the tape casting green body is prolonged. The EBECRYL series acrylic acid cross-linking agent is used as the curing agent, the addition amount of effective components is small (smaller than 5%), good flexibility is achieved after preliminary curing, safe cutting of the tape-casting green body can be achieved, and the tape-casting green body can be stored easily.

The invention belongs to the technical field of ceramic production assistants, and particularly relates to a building ceramic slurry dispersion-enhanced admixture as well as a preparation method and application thereof. The invention discloses a ceramic slurry dispersion-enhancement type additive. The ceramic additive is prepared from the following raw materials: a modified silicate material, a carboxylic acid grafted ester amine copolymer, modified polymethacrylate and a charge shielding agent. When the ceramic slurry dispersion-enhanced admixture is applied to ball-milling dispersion and sintering links in ceramic production, the dispersion performance of ceramic slurry can be further improved, the water demand in the ball-milling process and the energy consumption in the subsequent sintering process can be reduced, the strength of green bodies can be improved, the subsequent processing stability is facilitated, the rejection rate is reduced, and the production cost is reduced. The ceramic production efficiency is improved.

The invention discloses a ceramic pug for 3D printing direct-writing molding by using waste porcelain as a raw material, and a preparation method and a product thereof. Waste porcelain particles, Longyan kaolin, potassium feldspar, quartz, ulexite, water, a sodium silicate aqueous solution and a sodium tripolyphosphate aqueous solution are used as raw materials; the formed ceramic pug is prepared into a 3D printing direct-writing molded ceramic product through 3D printing direct-writing molding. According to the invention, the large-particle waste porcelain is used as a raw material, so that the recycling and crushing cost of the waste porcelain is reduced, the recycling proportion of the waste porcelain is increased, and the additional value of the product is increased by utilizing the unique appearance mechanism of the waste porcelain particles, so that a new technology and a new way are provided for the preparation of the ceramic pug for 3D printing direct-writing molding and the utilization of the large-particle waste porcelain.

The present application discloses a fiber-reinforced ceramic roller and a preparation method thereof, and relates to the technical field of ceramic rollers. The present application firstly compounds silica fibers having a specific aspect ratio and length, and a nanoporous structure with aluminum sol to form a silica fiber-aluminum sol composite material, and then mixes it with other raw materials such as alumina micropowder, kaolin, corundum sand, a binder, a solvent, etc., and obtains an alumina ceramic mud material through ball milling, spray granulation, etc.; preforms an alumina ceramic roller green body through a vacuum extrusion molding process; prepares an alumina ceramic roller green body through a cold isostatic pressing secondary molding process, and further improves the green body strength; generates continuous mullite fibers through high-temperature sintering in-situ reaction to obtain a fiber-reinforced alumina ceramic roller, and the obtained ceramic roller mullite fibers have good bonding and good dispersibility with the alumina matrix, and have excellent strength, thermal shock resistance, etc., and have a longer service life in a high-temperature kiln.

The invention discloses a method for preparing a ceramic water permeable brick through extrusion molding by taking waste porcelain as a raw material and a product prepared by the method. Waste porcelain particles, Longyan kaolin, ulexite and straw powder are taken as raw materials, and a peptizing lubricating solution is prepared from a sodium tripolyphosphate aqueous solution and a sodium silicate aqueous solution; through grain composition and kaolin peptization, plasticity and slippage effects are provided for the pug, and through extrusion molding, drying and calcination, the high-permeability ceramic water permeable brick is obtained. According to the invention, the ceramic water-permeable brick with excellent performance can be obtained through extrusion molding by taking the waste ceramic as the raw material without adding an organic plasticizer and a lubricant, the production efficiency of the ceramic water-permeable brick is improved, and the preparation cost of the water-permeable brick product is reduced, so that high-added-value recycling of the ceramic solid waste is realized.

The invention discloses a silicon nitride ceramic substrate and a preparation method thereof, and a preparation method of tape casting slurry, and the preparation method of the tape casting slurry comprises the following steps: step 1, slurry preparation: adding an organic solvent into pretreated silicon nitride powder, mixing, then adding a sintering aid, a binder, a flexibilizer and a dispersant, and carrying out ball milling in a ball mill for 12-24 hours to obtain slurry; uniform and stable slurry is prepared; and step 2, tape casting. By optimizing the preparation method of the silicon nitride tape-casting slurry, the stability and dispersity of the slurry are improved, so that the quality of a tape-casting film is ensured, and silicon nitride powder is uniformly dispersed in the slurry by adopting a specific sintering aid, an organic solvent, a binding agent and a dispersing agent and controlling parameters such as stirring speed and ball-milling time in the preparation process, so that the silicon nitride tape-casting slurry is prepared. Consistency and stability are high, the casting thickness is easy to control, the drying system is simple, and the green body strength and toughness are high.

The utility model discloses an aluminum oxide ceramic sealing test standard part green body dry pressing forming die which comprises a variable-diameter cylindrical positioning rod fixing die, a variable-diameter cylindrical positioning rod, a circular ring inner concave petal die, a cylindrical outer die, a circular ring gasket die, a circular ring column ejector rod and a die withdrawing groove. The variable-diameter cylindrical positioning rod fixing mold is used for fixing, supporting and positioning the variable-diameter cylindrical positioning rod; the variable-diameter cylindrical positioning rod has the functions of positioning, blank inner supporting and filler guide mold; the circular ring inner concave petal die consists of two petal dies and is positioned through a variable-diameter cylindrical positioning rod and a cylindrical outer die; the circular ring gasket die is positioned by a variable-diameter cylindrical positioning rod and a cylindrical outer die; the ceramic blank is filled between the circular ring inner concave petal die and the circular ring gasket die; the annular column ejector rod is positioned through the variable-diameter cylindrical positioning rod and the cylindrical outer mold; and demolding through the demolding groove. The forming die disclosed by the utility model can realize dry-pressing forming and convenient demolding of special-shaped ceramic green bodies, is simple and convenient to operate, and the obtained green bodies are high in strength and small in firing shrinkage.

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 rubber composition for duckbilled valve cord fabric rubber as well as a preparation method and application thereof, belongs to the technical field of rubber products, and solves the technical problems that bubbles formed in first-stage mixing of existing masterbatch continue to enter second-stage mixing, so that the bubbles are difficult to defoam, the performance of the rubber products is reduced and the like. The rubber composition is prepared from rubber, a reinforcing agent, zinc oxide, stearic acid, a vulcanizing agent, an accelerant, operating oil, resorcinol, an adhesive and molybdenum polybutadiene rubber (CVBR) according to the mass part ratio, and the rubber is prepared by combining natural rubber and butadiene-styrene rubber through a two-stage process. The preparation process disclosed by the invention has the advantages of improving the performance and quality of the rubber mixture finished product and the like.