44results about How to "Enhanced ceramic performance" patented technology

A ceramic drill bit comprising a cylindrical shank and a shaped portion extending axially in line with the shank and having a free end forming the tip of the bit, a relief face extending from each main cutting edge with a relief angle lying in the range 4° to 10° approximately relative to a plane perpendicular to the axis of rotation of the bit, and two notches forming two secondary cutting faces extending from the central edge with positive cutting angles lying in the range 10 to 70 approximately relative to the axis of rotation of the bit.

The invention discloses porcelainized fireproof and heat insulation foamed silicone rubber and a preparation method thereof. The rubber comprises the following raw materials in parts by weight: 100 parts of base rubber, 10 to 60 parts of porcelain forming filler, 0.1 to 0.5 part of a platinum catalyst, 0.5 to 1.5 parts of silicone oil, 2 to 10 parts of a foaming agent, 0.1 to 0.5 part of a vulcanizing agent, and 0.1 to 0.4 part of a vulcanization accelerator. The foamed silicone rubber has good ceramic effect, does not have surface cracks, is hard in texture, keeps a complete foam structure, ensures that the volume retention rate is 85% or higher, and is excellent in fireproof performance.

The invention belongs to the technical field of ceramic materials, and particularly relates to silicon nitride ceramic slurry, silicon nitride ceramic and a preparation method and application thereof.The preparation method for the silicon nitride ceramic slurry provided by the invention comprises the following steps: step one, heating silicon nitride powder, to obtain thermal-oxidized silicon nitride powder; step two, mixing the thermal-oxidized silicon nitride powder and a sintering aid, and drying, to obtain dry powder; step three, enabling the dry powder to mix with a resin, a dispersing agent, a defoaming agent and a photoinitiator, to obtain the silicon nitride ceramic slurry. The advantage of the preparation method is that the surface oxidation treatment cost of the silicon nitridepowder is low, the solid content of the silicon nitride ceramic slurry is apparently improved, a scattering phenomenon of the silicon nitride ceramic slurry in a photocuring forming process is reduced, the needed exposure time of the silicon nitride ceramic slurry in the photocuring forming process is reduced, a forming efficiency is improved, and the thermal-oxidized silicon nitride powder can promote sintering densification and improve ceramic performance.

The invention belongs to the technical field of paints, and particularly relates to a high-temperature ceramic organosilicon-phenolic epoxy anticorrosive paint and a preparation method thereof. The paint is characterized in that organosilicon-phenolic epoxy resin is synthesized through a chemical grafting method, and the resin simultaneously has an organosilicon chain segment and a phenolic epoxy chain segment. On the one hand, the resin has the characteristics of heat resistance, weather resistance, wear resistance, flexibility and the like of the organosilicon chain segment, the phenolic epoxy chain segment on the resin molecule has a higher metal base material adhesive force than the organosilicon chain segment, and the corrosion resistance effect after the phenolic epoxy chain segment is crosslinked with a curing agent is higher than that of the organosilicon chain segment, thereby solving the problems of low adhesive force and poor anticorrosive effect of the organosilicon paint; and on the other hand, the carbon residue rate of the phenolic epoxy chain segment in a high-temperature environment is high, and the phenolic epoxy chain segment and a thermal degradation product of the organosilicon chain segment in the high-temperature environment can form secondary film forming action, thereby improving the ceramic effect of a coating in the high-temperature environment.

The invention relates to a low-smoke zero-halogen ceramic fireproof cable material and a preparation method thereof. The low-smoke zero-halogen ceramic fireproof cable material is prepared from the following materials in parts by weight: an ethylene-vinyl acetate copolymer, an ethylene-alpha-olefin copolymer, maleic anhydride-grafted amorphous polyolefin, mica powder, ceramic powder, glass powder, magnesium hydroxide, calcium oxide, zinc oxide, melamine cyanurate, an antioxidant 1010, a silane coupling agent A-172, and lubricant silicone master batch; the ethylene content of the ethylene-vinyl acetate copolymer is 28-40%, and the melt flow rate is 3-5g/10min; the ethylene-alpha-olefin copolymer is a mixture of one or two of an ethylene-alpha-propylene copolymer and an ethylene-alpha-octene copolymer which are mixed according to any ratio by weight; the glass powder is low-melting-point glass powder having the melting point of 500-800 DEG C. The low-smoke zero-halogen ceramic fireproof cable material is porcelainized to change into a hard ceramic protection layer after ignition at high temperature and has certain mechanical strength, thereby ensuring normal operation of a wire and cable line.

The invention belongs to the field of non-oxide ceramic materials and discloses a high-performance silicon nitride ceramic mobile phone rear cover material as well as a preparation method and application thereof. The preparation method disclosed by the invention comprises the following steps: mixing and drying Si3N4 and MgO-Re2O3 to obtain powder A; performing the same mixing process on the pure Si3N4 powder, drying to obtain the powder B, sequentially filling the powder A and the powder B into a sintering furnace, and preparing the high-performance Si3N4 ceramic gradient material which is hard in surface and tough in interior in a nitrogen atmosphere, wherein the nitrogen pressure is a negative pressure. The relative density of the prepared Si3N4 ceramics is higher than 95%, the surface hardness is 18-30GPa, the breaking tenacity of the inner layer is 10-20MPa.m<1/2>, and the overall bending strength is 1200-1500MPa. According to the method disclosed by the invention, preparation of the high-performance Si3N4 gradient ceramics is realized. Finally, the high-performance silicon nitride ceramic mobile phone rear cover product is prepared by cutting, coarse grinding, accurate grinding and polishing.

The present invention relates to a ceramic powder and special raw material and use thereof. The raw material of the ceramic powder comprises 20-80 mass parts of SiO₂, 10-50 mass parts of AlF₃ and 0-30 mass parts of regulator. The raw material for preparing the ceramic powder is mixed and crushed, followed by melted into liquid glass at 1200-1400° C., quenched to obtain the ceramic powder. The low temperature co-fired ceramic powder has the following advantages: low sintering temperature (750-850° C.) and controllable sintering shrinkage rate; the dielectric constant of the ceramic block prepared with the ceramic powder is adjustable between 4.5 and 10 (1 MHz), the dielectric loss is less than 0.002, the mechanical strength is high and the preparation process is simple. The ceramic powder may be used for electric devices such as ceramic substrate, resonator, etc. as well as in other microelectronic packaging.

The invention provides a high-strength flame-retardant cable special material and a preparation method thereof, and relates to the technical field of cable special materials. The cable special material comprises the following raw materials in parts by weight: 100-120 parts of methyl vinyl silicone rubber, 1-5 parts of boron oxide, 15-20 parts of a reinforcing filler, 20-30 parts of low-melting-point glass powder, 15-20 parts of magnesium hydroxide, 5-10 parts of aluminum hydroxide, 1-5 parts of a modified flame retardant, 5-8 parts of a structure control agent, 3-5 parts of a vulcanizing agent and 15-20 parts of decabromodiphenyl ether. The prepared high-strength flame-retardant cable special material effectively reduces the ceramization temperature of a silicone rubber fireproof composite material, improves the ceramization conversion rate and the ceramization strength, has excellent flame retardancy and high resistivity, can meet the requirements of the industry, and has a good application prospect.

The invention discloses a preparation technology of a low-smoke and halogen-free ceramic polyolefin refractory insulation material. The technology includes the steps of: 1. putting metallocene polyethylene, an ethylene-alpha-octene copolymer, high density polyethylene resin, maleic anhydride grafted amorphous polyolefin, pentaerythritol, boron carbide, silicon carbide, nano-aluminum hydroxide, brucite, talcum powder, an antioxidant, a silane coupling agent, sodium dodecylbenzene sulfonate and lubricant silicone masterbatch all into an internal mixer at one time for mixing, and performing discharging when the temperature of the mixed materials reaches 140-145DEG C; and 2. sending the material obtained in step 1 into a tapered feeding hopper, and conducting plasticizing extrusion by a twin-screw extrusion set. The polyolefin refractory insulation material obtained by the technology provided by the invention has good ceramic performance, the sintered ceramic shell has high bending strength, the crust is very hard and dense, no secondary fire is caused, and the refractory insulation material can be fired into a hard ceramic armor to reach very good heat insulation, cooling and refractory effects, has low smoke during combustion, is halogen-free, non-toxic and odorless, and passes the ROHS inspection standards.

A ceramic electronic component includes a first internal electrode that includes a first opposed section and a first extraction section. The first opposed section is opposed to a second internal electrode with a ceramic layer interposed therebetween. The first extraction section is located closer to a first end surface than the first opposed section. The first extraction section includes a first thick section. The first thick section is thicker than a first central section of the first opposed section. The first opposed section includes a first base end section opposed to a second tip section of the second internal electrode closer to the first end surface, with the ceramic layer interposed therebetween, and the first base end section includes a first thin section. The first thin section is thinner than the first central section.

The invention discloses a stoving varnish coating with a ceramic-imitating effect for a glass wine bottle, and relates to the field of coatings. The stoving varnish coating with the ceramic-imitating effect for the glass wine bottle is a double-component stoving varnish coating and comprises the following raw materials in parts: a component A: 30-40 parts of modified silica sol, 25-35 parts of a water-based acrylic dispersion, 0.2-0.3 part of a defoaming agent, 0.1 part of fumed silica, 0.2 part of an anti-sagging auxiliary agent, 1.2-2 parts of a dispersing agent, 0.3-0.5 part of a neutralizing agent, 7-8 parts of amino resin, 6-8 parts of titanium dioxide, 3-4 parts of ceramic micro powder, 8-12 parts of a cosolvent and 26-32 parts of deionized water. According to the stoving varnish coating with the ceramic-like effect for the glass wine bottle, the appearance and touch feeling of a glass stoving varnish coating film can be consistent with the ceramic effect, so that the acceptance degree of consumers is increased; in addition, a glassware is arranged inside, the sealing degree of the glassware and the safety of wine products can be guaranteed after wine is contained; meanwhile, the prepared coating is good in stability and the alcohol resistance after baking is excellent.

The invention provides a high-activity submicron boron carbide ceramic powder and a low-temperature in-situ preparation method thereof, and belongs to the field of preparation of boron carbide powder.The preparation method comprises the following steps: proportioning boric acid, petroleum coke and a rare earth oxide additive, drying, carrying out high-energy ball milling, crushing, and dry-pressmolding, and carrying out low-temperature carbon thermal reduction in an ultralow-frequency heating furnace to in-situ prepare the high-activity submicron boron carbide ceramic powder. According to the method, preparation and crushing are integrated, submicron B4C powder can be directly prepared, and subsequent tedious crushing and purifying are not needed. The rare earth oxide can reduce the carbon thermal reduction temperature, inhibit the growth of B4C grains and prevent the coarsening of grains. Meanwhile, due to the addition of the rare earth oxide, a second phase for promoting subsequentB4C ceramic sintering can be generated through an in-situ reaction, and the sintering activity of the ceramic powder is greatly improved. Compared with the prior art, the method has the advantages oflow reaction temperature, short reaction time, low cost, environment friendliness, energy conservation, consumption reduction and the like, and the process is simple and feasible and can be suitablefor industrial large-scale popularization.

The invention belongs to the technical field of ceramic materials, and discloses high-hardness hafnium-based ternary solid solution boride ceramic as well as a preparation method and application thereof. The molecular formula of the boride ceramic is (HfaMe1bMe2c)B2, 0.1</=a</=0.9, 0<b<0.9, 0<c<0.9, and a+b+c=1; Me1 and Me2 are Zr, Ta or Ti. The ceramic is prepared by the following steps of adding HfO2, Me1 and Me2 oxides, B4C and carbon powder into a solvent, carrying out ball milling to obtain mixed powder, carrying out die pressing to obtain a blank, putting the blank into a graphite crucible, heating to 1400-1600 DEG C, carrying out heat preservation, and carrying out vacuum heat treatment to obtain hafnium-based ternary solid solution boride powder, and heating the ternary solid solution boride powder to 1000-1400 DEG C by adopting spark plasma sintering, introducing a protective atmosphere, heating to 1900-2100 DEG C, and calcining at the pressure of 10-100 MP to obtain the ternary solid solution boride powder.

The invention relates to a ceramic firing kiln with controllable firing atmosphere, and belongs to the technical field of the ceramic firing. The ceramic firing kiln comprises an air passage between the firing area and the atmosphere control area. The air passage mainly comprises an air passage between the areas, a fresh air inlet passage, an air exhaust passage, an airflow internal circulation passage, an airflow external circulation passage and so on. The ceramic firing kiln with the controllable firing atmosphere is capable of solving the problem that an electrical kiln cannot generate the stable controllable reducing atmosphere internally. Compared with the traditional wood-fired kiln, only a small quantity of the wood charcoal or other carbon component reactants is used for once-firing, the energy loss is controlled, the discharge of a lot of the carbon dioxide or other harmful gases is reduced, the interior of the kiln can reach the higher temperature, the ceramic performance is increased, and the craft art characteristics is improved. Compared with the current common gas kiln in the market, not only the safety is improved, but also the exhaust emission is reduced, the atmosphere generation and the internal temperature control of the kiln are independent mutually, the user operation is simple and convenient, and the rate of the ceramic finished products is greatly improved.

The invention relates to a preparation method of foamed silicone rubber, and belongs to the field of material preparation. The preparation method is characterized by comprising the following steps of:weighing 100g of rubber compound prepared from methyl vinyl silicone rubber, carrying out mill mixing in a two-roll mixing mill at a room temperature, wrapping rolls with silicone rubber, then adding10-60g of glass fiber powder, a platinum catalyst, 0.2-1.0g of hydrogen-containing silicone oil, and 0-0.8g of hydroxy silicone oil; mixing evenly, and discharging a sheet; and flatly paving, puttingin an aging testing machine for vulcanization, simultaneously foaming, setting the temperature to be 240 DEG C and time to be 5 minutes, and completing the preparation of the foamed silicone rubber.The fire-retardant foamed silicone rubber which can be ceramized at a high temperature is prepared by vulcanization carried out through hydrosilylation reaction and foaming carried out through siliconhydrogen dehydrogenation reaction. After the foamed silicone rubber is fired at the temperature of 1000 DEG C for 30rain, the foamed silicone rubber has good ceramicization effect and hard texture without surface cracks, the cellular structure is kept perfectly, the volume retention rate is above 85%, and the fireproof performance is excellent.

The invention discloses a Ti(C, N) based metal ceramic, which comprises: C black, WC, Ni, Ti, Mo, Cr3C2, N, and Cr. The Ti(C, N) based metal ceramic provided by the invention improves the performance of metal ceramic, makes the metal ceramic have stronger market competitiveness, and broadens the application field of metal ceramic hard alloy.