149 results about "Sintered ceramic" patented technology

The invention belongs to the technical field of ceramic slurry, and particularly relates to ceramic slurry and a preparation method and application thereof.The ceramic slurry comprises inorganic components and organic components, the inorganic components comprise inorganic additives and glass powder, the inorganic additives comprise Al2O3, ZrO2 and Y2O3, and the organic components comprise modified acrylic resin, organic solvent and auxiliaries. By controlling the relative content of carboxyl and ester groups in the modified acrylic resin and utilizing the polarity difference of functional groups, selective adsorption of inorganic powder is realized, so that the dispersion uniformity of the powder in the ceramic slurry is remarkably improved, segregation of yttrium oxide is effectively inhibited, and the service life of the ceramic slurry is prolonged. Therefore, monoclinic-phase zirconium oxide, tetragonal-phase zirconium oxide and cubic-phase zirconium oxide with a proper proportion can be formed in the sintered ceramic substrate, further the bending strength of the ceramic substrate is remarkably improved, and the ceramic substrate is particularly suitable for manufacturing miniaturized and thin electronic components.

The invention relates to the technical field of ceramics, and particularly discloses green special refractory ceramic slurry as well as a preparation method and application thereof. The green special refractory ceramic slurry is prepared from aluminum oxide, methyltrimethoxysilane-phosphoric acid modified polysiloxane, fluorocarbon emulsion, expanded vermiculite powder, silane coupling agent modified feldspar tailing powder, a dispersing agent, an organic silicon defoaming agent, a polyurethane curing agent and deionized water. After being sintered, the green special refractory ceramic slurry provided by the invention has excellent high-temperature stability, corrosion resistance, thermal shock resistance and mechanical strength, and solves the problems of low high-temperature-resistant upper limit and poor corrosion resistance of the traditional slurry, so that the sintered ceramic adapts to severe high-temperature working conditions such as steel plant converter liners and chemical high-temperature reaction kettle inner walls; and long-term protection requirements of industrial equipment are met.

Proppant particles formed from slurry droplets and methods of use are disclosed herein. The proppant particles can include a sintered ceramic material and can have a size of about 80 mesh to about 10 mesh and an average largest pore size of less than about 20 microns. The methods of use can include injecting a hydraulic fluid into a subterranean formation at a rate and pressure sufficient to open a fracture therein and injecting a fluid containing a proppant particle into the fracture, the proppant particle including a sintered ceramic material, a size of about 80 mesh to about 10 mesh, and an average largest pore size of less than about 20 microns.

Disclosed is a pre-sintered ceramic block for a dental restoration, which has a low pre-sintering temperature, contains a silica main crystal phase, but does not contain or contains a small amount of lithium metasilicate crystal phase. The pre-sintered ceramic block has a low hardness, with a Vickers hardness of 0.5-3 GPa, which is significantly lower than that of a ceramic block containing a lithium metasilicate crystal phase, and same is suitable for dry machining and also wet machining when being machined into a dental restoration.

The invention discloses a high-durability multifunctional composite material for landscape architecture and a preparation method of the high-durability multifunctional composite material, and relates to the technical field of outdoor wood composite materials. Thermoplastic, plant fibers, a hydrophobic agent, a compatilizer and a composite antioxidant are blended to prepare a hydrophobic modified wood-plastic composite material, and the hydrophobic modified wood-plastic composite material is used as a core layer; the preparation method comprises the following steps: blending a wood unit, a low-temperature sintered ceramic precursor, nano titanium dioxide and an inorganic binder to prepare a photocatalyst-loaded microporous ceramic-wood composite material, and forming a functional surface layer of the photocatalyst-loaded microporous ceramic-wood composite material; according to the high-durability multifunctional composite material for the landscape architecture, synchronous co-extrusion is utilized, the surface of the core layer is coated with the functional surface layer, curing and shaping are conducted, and the high-durability multifunctional composite material for the landscape architecture is obtained and is a novel landscape material which integrates high durability, long service life, low maintenance, environment friendliness and aesthetic value and can actively keep the surface clean.

A method of manufacturing ceramic tape includes a step of directing a tape of partially-sintered ceramic into a furnace. The tape is partially-sintered such that grains of the ceramic are fused to one another yet the tape still includes at least 10% porosity by volume, where the porosity refers to volume of the tape unoccupied by the ceramic. The method further includes steps of conveying the tape through the furnace and further sintering the tape as the tape is conveyed through the furnace. The porosity of the tape decreases during the further sintering step.

The invention relates to a sintered ceramic body having a large size and a method for manufacturing the same. The method comprises the following process steps: providing a ceramic powder (5) within an internal volume of a spark plasma sintering tool (1), wherein the tool comprises: a mold (2); upper and lower punches (4, 4 ') creating a gap (3) between the punches and the inner wall when at least one of the punches moves within the internal volume; creating a vacuum condition within the interior volume; moving at least one of the punches to apply pressure to the ceramic powder while heating, and sintering; and reducing the temperature of the sintered ceramic body.

The invention provides a carbon ceramic vessel and a preparation method thereof.The preparation method of the carbon ceramic vessel comprises the steps that a ceramic body is subjected to first-time polishing treatment, and the polished ceramic body is obtained; carrying out sintering molding on the polished ceramic green body to obtain a sintered ceramic green body; carrying out liquid carburization and gas carburization on the sintered ceramic body to obtain a ceramic body of which at least part of pores contain a carbon film; and carrying out secondary polishing treatment on the ceramic green body containing the carbon film in at least part of pores to obtain the carbon ceramic vessel. According to the preparation method of the carbon ceramic vessel, through liquid carburization and gas carburization, a large number of carbon films can be formed in pores of the ceramic body, the water absorption rate of the ceramic body is greatly reduced, and the heat transfer performance is improved; and meanwhile, through two times of polishing treatment, the surface roughness and surface pores of the carbon ceramic ware can be reduced, and the carbon ceramic ware is glossy and better in appearance effect.

This invention discloses a selective roughening method for ceramic copper-clad laminates, comprising the following preparation steps: S1 printing an active solder layer between ceramic and copper foil; S2 preparing the ceramic copper-clad laminate; S3 etching copper onto the sintered ceramic copper-clad laminate; S4 removing unwanted solder layers; S5 cleaning, roughening, cleaning, acid washing, cleaning, immersion, and drying the patterned ceramic copper-clad laminate according to the following process, and filling it with nano-silicon and organosilane; S6 printing a thermosetting wet film to expose the area to be surface treated; S7 removing the surface roughening structure; S8 finally, subjecting the ceramic copper-clad laminate to nickel plating, chemical silvering, and then stripping to form the final structure. Compared with the prior art, this invention has the following beneficial effects: effectively avoiding the problem of solder voids caused by surface roughening pits, good surface weldability, and the concave structure of the welding area effectively prevents solder overflow during the welding process and reduces micropores in the chemical silver plating layer.

The invention provides a low-smoke halogen-free high-flame-retardant power cable and a preparation method thereof, and the low-smoke halogen-free high-flame-retardant power cable comprises a conductor, an insulating layer and a sheath layer. The sheath layer is prepared from the following raw materials: 25 to 40 parts of ethylene-vinyl acetate copolymer, 15 to 25 parts of linear low-density polyethylene, 5 to 15 parts of metallocene polyethylene, 8 to 15 parts of reactive phosphorus-nitrogen-silicon hybrid compatibilizer, 12 to 22 parts of low-temperature sintered ceramic composite powder, 30 to 45 parts of surface-treated magnesium hydroxide, 15 to 25 parts of surface-treated aluminum hydroxide, 3 to 6 parts of organic modified montmorillonite and 1.5 to 2.5 parts of triallyl isocyanurate. 1.0 to 2.0 parts of a composite antioxidant, 1.0 to 2.5 parts of a calcium-zinc stabilizer and 0.5 to 1.5 parts of silicone master batch. The prepared low-smoke halogen-free high-flame-retardant power cable has excellent flexibility, mechanical property, heat resistance and processability, is stable in flame retardant property and stable in size, and is suitable for safety protection of power cables.

The utility model relates to the technical field of vacuum arc extinguish chambers, in particular to a vacuum arc extinguish chamber shielding cylinder fixing structure which comprises a shell, a shielding cylinder and a plurality of movable parts, the shell is provided with a vacuum cavity, the cavity wall of the vacuum cavity is provided with a first protruding part, and the side wall of the shielding cylinder is provided with a second protruding part. The second protruding part abuts against one end of the first protruding part, and each movable part is in threaded connection with the shielding cylinder, extends out of the outer side wall of the shielding cylinder by a preset distance and abuts against the other end of the first protruding part. And the movable piece abuts against the first protruding part, so that the protrusion with the adjustable extending length is achieved, and the shielding cylinder is prevented from shaking and making abnormal sounds.

The application discloses a preparation method of a high-strength aluminum nitride substrate and relates to the technical field of aluminum nitride substrate preparation. The method comprises the following steps: preparing modified aluminum nitride powder; adding a non-oxygen composite sintering aid composed of fluorides and borides to the modified aluminum nitride powder to obtain a mixture; the adding amount of the composite sintering aid is 0.5wt%-5wt% of the total mass of the modified aluminum nitride powder; the mixture, a binder and a dispersant are mixed in a planetary ball mill to obtain a uniform slurry; the slurry is subjected to flow casting to form a green porcelain embryo, and then, glue removal treatment is performed under the protection of flowing inert gas to remove the binder; the green porcelain embryo after glue removal is placed in an atmosphere sintering furnace to perform a multi-stage temperature rising sintering procedure to form a ceramic body; and the sintered ceramic body is subjected to heat treatment and then cooled to obtain the aluminum nitride substrate. The application reduces the lattice thermal resistance of the aluminum nitride substrate and improves the mechanical strength of the aluminum nitride substrate.

This utility model discloses a demolding device for a pressing mold, including a pressure screw, a hollow demolding screw, and a screw support. The screw support includes a base, on which a hollow demolding screw support nut bracket and a pressure screw support nut bracket are fixedly installed. The hollow demolding screw is threadedly connected to the nut hole on the hollow demolding screw support nut bracket, and a pressure screw is threadedly connected to the nut hole on the pressure screw support nut bracket. A cylindrical cavity is formed in the center of the hollow demolding screw, through which the pressure screw passes. This demolding device for a pressing mold significantly reduces cracking damage to the ceramic blank after demolding. It has good demolding effects for both experiments with and without adhesive powder. The demolded blanks have high consistency and few defects, providing accurate and reliable performance evaluation of the sintered ceramic powder. Furthermore, it greatly improves the demolding success rate, efficiently obtaining high-quality blanks.

A method for enhancing mechanical properties of sintered, zirconia ceramic bodies and zirconia ceramic dental restorations is provided. A porous or pre-sintered stage of a ceramic body may be treated with a tantalum-containing composition prior to sintering. Alternatively, zirconia ceramic powder may be coated with a tantalum-containing composition prior to forming a shaped ceramic body. After sintering, the resulting ceramic bodies have enhanced mechanical properties, such as greater fracture toughness, without a significant decrease in optical properties.

Described is sintered zirconia-toughened alumina (ZTA), e.g., in the form of a sintered zirconia-toughened alumina body, and methods of preparing these sintered bodies, wherein the sintered ZTA includes silica to improve a machinability property of the sintered ZTA.

The invention provides a high-strength high-thermal-conductivity reaction-sintered SiC ceramic material and a preparation method thereof.The preparation method comprises the following steps that silicon carbide powder and carbon source powder are mixed and then subjected to ball milling treatment, and mixed powder is obtained; mixing the mixed powder with a binder, a plasticizer and a lubricant, and carrying out high-speed centrifugal stirring and rolling homogenization treatment to obtain a silicon carbide mud blank for injection molding; putting the silicon carbide mud blank for injection molding into a mold, carrying out hot-press injection molding, demolding to obtain a silicon carbide prefabricated body, and carrying out glue removal treatment to obtain a silicon carbide biscuit; and paving silicon particles on the silicon carbide biscuit, carrying out vacuum high-temperature infiltration, and cooling. According to the preparation method, the plastic deformation capacity of the silicon carbide mud blank is optimized by regulating and controlling the component proportion, in the preparation process, the movement rearrangement effect among particles is enhanced by applying reinforced shearing centrifugal stirring and rolling treatment to a mixed system, the density of a biscuit is effectively improved, residual silicon is promoted to be uniformly distributed, and the content and size of the residual silicon are reduced; and the overall performance of the material is improved.

The present invention describes a method for deforming sintered ceramic (3) by reheating it to a deformable state and adapting it to a shape (1) by means of self-gravity. The method offers an efficient and controlled method for producing complex ceramic parts such as washbasins and represents a significant improvement over conventional methods.

The invention discloses a magnetorheological elastomer self-adaptive clamping mechanism for ceramic body machining, and relates to the technical field of ceramic machining. The device comprises a base, symmetrical clamping arms, a linear driver, a self-adaptive clamping plate assembly and a main control unit, a magneto-rheological elastomer column and a micro vortex vacuum pump are arranged in the self-adaptive clamping plate assembly, and the main control unit achieves clamping force closed-loop control with + / -0.02 N precision through a PID algorithm; the miniature vortex vacuum pump forms stable pressure difference adsorption in a 5Pa vacuum environment, and the friction force of the miniature vortex vacuum pump, the nanometer silica gel anti-skid layer and the clamping force of the magnetorheological elastomer form triple synergistic fixation. The technical problems of clamping damage and adsorption failure of the ceramic green body in the vacuum environment are solved, and the vacuum spraying device is suitable for machining procedures such as vacuum spraying and fettling of the unsintered / semi-sintered ceramic green body.

The invention belongs to the technical field of fluorescent ceramic preparation, and relates to an enhanced near-infrared luminescence MgAl2O4: Cr < 3 + > fluorescent ceramic and a preparation method thereof, and the preparation method comprises the following steps: dissolving Mg (NO3) 2.6 H2O, Al (NO3) 3.9 H2O and Cr (NO3) 3.9 H2O in deionized water, then adding urea, stirring and dissolving; transferring the mixed solution into a reaction kettle for hydrothermal reaction to obtain MgAl2O4: Cr < 3 + > powder; adding a sintering aid CaF2 into the MgAl2O4: Cr < 3 + > powder, and carrying out ball milling and mixing; the ball-milled powder is poured into a mold to be compacted and then put into an SPS sintering furnace to be sintered; the sintered ceramic is subjected to annealing treatment; the surface of the annealed ceramic is sequentially subjected to coarse grinding and polishing operation, and the MgAl2O4: Cr < 3 + > fluorescent ceramic is obtained. According to the method, the luminescent property of Cr < 3 + > is remarkably promoted, and meanwhile, the high density and excellent mechanical property of the ceramic are guaranteed.

Ceramic particles for use in a solar power tower and methods for making and using the ceramic particles are disclosed. The ceramic particle can include a sintered ceramic material formed from a mixture of a ceramic raw material and a darkening component comprising MnO as Mn2+. The ceramic particle can have a size from about 8 mesh to about 170 mesh and a density of less than 4 g / cc.

This application relates to a relaxor ferroelectric piezoelectric ceramic material, its preparation method, and its application, belonging to the field of piezoelectric ceramic technology. The method includes: obtaining a ceramic precursor powder after pre-firing, grinding, and drying; preparing the ceramic precursor powder into a casting slurry to form a ceramic green sheet; printing internal electrodes on the ceramic green sheet and performing lamination pressing to obtain a laminated green sheet; hot-cutting the ceramic green sheet to obtain the ceramic green sheet, wherein the internal electrode is an Ag-Pd-Cu ternary metal system, with Ag at 80-90 wt%, Pd at 5-15 wt%, and Cu at 3-8 wt%; performing staged atmosphere co-firing treatment; and performing electrode connection and polarization treatment on the sintered ceramic to obtain a laminated piezoelectric ceramic device. This application synergistically controls the composition of the internal electrode and the sintering atmosphere path, improving the bonding performance of the ceramic-electrode interface, reducing thermal stress concentration, and enhancing the stability and reliability of the laminated piezoelectric ceramic during polarization and use.

A spark plasma sintering tool (1) is provided. The tool includes a die (2) including an inner wall having a diameter defining an internal volume configured to receive ceramic powder (5) and an upper punch (4) and a lower punch (4') operably coupled with the die, wherein each of the upper punch and the lower punch has an outer wall defining a diameter that is smaller than the diameter of the inner wall of the die, whereby when at least one of the punches moves within the internal volume of the die, a gap of 10-100 pm wide is created between each of the punches and the inner wall of the die. Also disclosed is a method of using the tool to produce a large sintered ceramic body and a computer readable medium storing processor executable instructions adapted to cause one or more computing devices to operate the tool.

The invention relates to the technical field of piezoresistors, in particular to a piezoresistor disc and a preparation method thereof.The piezoresistor disc comprises two electrodes and a ceramic substrate arranged between the two electrodes, and a plurality of transition layers are arranged at the contact positions of the ceramic substrate and the electrodes; the materials of the transition layers are obtained by doping silver powder with different mass fractions on the basis of ceramic base powder used for sintering the ceramic matrix, and the mass fractions of the silver powder in the multiple transition layers are gradually increased from the side close to the ceramic matrix to the side close to the electrode, so that gradient transition from the ceramic matrix material to the electrode material in component is formed. When the temperature changes, the thermal expansion difference between the adjacent transition layers can be obviously reduced, stress concentration generated at the interface due to the fact that the thermal expansion coefficient difference of two materials is too large in a traditional structure is avoided, and therefore the possibility that interface resistance changes after long-time use is reduced.

The present invention provides a plate-type heating device and a method of manufacturing the same, the device including a ceramic plate substrate and a heating wire embedded in the ceramic plate substrate, in which a non-sintered ceramic powder is positioned between an outer peripheral portion of the heating wire and the ceramic plate substrate. The non-sintered ceramic powder is a material having a sintering temperature that is at least 50 DEG C higher than a ceramic material constituting the ceramic plate substrate, a coefficient of thermal expansion that is less than or equal to a coefficient of thermal expansion of the ceramic material, and a coefficient of thermal conductivity that is greater than or equal to a coefficient of thermal conductivity of the ceramic material.

The application relates to the technical field of boron carbide preparation, in particular to a preparation method of a gradient boron carbide with an interlayer stress buffering structure. Main steps include the following: first, rare earth-boron carbide composite powder is prepared, then a core-shell powder is formed by wrapping the powder with an MXene dispersion liquid through electrostatic adsorption; the core-shell powder, three-dimensional carbon nanotubes and titanium and aluminum metal powder are mixed in proportion, the three-dimensional carbon nanotube content is gradually reduced from the ceramic side to the metal side, and the powder is divided into five layers of gradient composite intermediate layer powder, flow casting is carried out to obtain a gradient layer, meanwhile, boron carbide mixed powder containing a sintering aid is prepared and pre-sintered to obtain a ceramic layer, the pre-sintered ceramic layer and the gradient layer are stacked and assembled, and hot-press sintering is carried out, finally, the sintered structure is cooled, processed and surface polished to obtain an interlayer stress buffering structure, the interface is firmly combined and the impact resistance is excellent.

The invention relates to a building radiation refrigeration ceramic tile taking industrial silicon slag as a raw material and a preparation method thereof. The ceramic is prepared by molding industrial silicon slag powder with the particle size of more than or equal to 100 meshes at room temperature and sintering at high temperature. The sintered ceramic is of a porous structure and mainly comprises silicon oxide and silicate. The porous structure has a strong Mie scattering effect on a solar spectrum and does not absorb solar spectrum energy, silicon oxide and silicate components have strong infrared radiation characteristics in an atmospheric window, and the ceramic tile has a radiation refrigeration function by combining the two mechanisms. When the ceramic tile is used for building exterior wall decoration, building refrigeration energy consumption can be effectively reduced. According to the radiation refrigeration ceramic tile, the sunlight spectrum wave band reflectivity is larger than or equal to 0.85, the 8-12 micron wave band emissivity in an atmospheric window is larger than or equal to 0.82, the refrigeration efficiency under the direct solar radiation condition is larger than or equal to 83 W / m < 2 >, and the refrigeration temperature difference of 6.2 DEG C is achieved. Theoretical calculation shows that in the typical environment of the Nanchang city, by using the ceramic tile, the refrigeration energy consumption can be saved by more than or equal to 16 MJ / m < 2 > all year round. According to the invention, high-value utilization of the industrial silicon slag can be realized, and the prepared building radiation refrigeration ceramic tile has good application potential in the field of reduction of building energy consumption, so that the purpose of sustainable and green social development is achieved.

The invention relates to a heating device (10), in particular for infrared cabins, saunas, steam baths or the like, and a method for carrying out an infusion with a heating device, in particular for infrared cabins, saunas, steam baths or the like, wherein the heating device has a heating device (11) for emitting heat energy and a storage device (12), wherein the storage device has at least one storage medium (13) for storing heat energy, wherein a liquid for carrying out an infusion can be supplied to the storage device in such a way that the liquid can be applied to the storage medium, wherein the storage medium is made of a metal foam, ceramic foam, sintered metal or a sintered ceramic.

The invention discloses a preparation method of a high-strength aluminum nitride substrate, and relates to the technical field of preparation of aluminum nitride substrates. Comprising the following steps: preparing modified aluminum nitride powder; taking the modified aluminum nitride powder as a main raw material, and adding a non-oxygen composite sintering aid composed of a fluorine compound and a boride to obtain a mixture; the addition amount of the composite sintering aid is 0.5 wt%-5wt% of the total mass of the modified aluminum nitride powder, and mixing the mixture, a binder and a dispersant in a planetary ball mill to obtain uniform slurry; carrying out tape casting on the slurry to prepare a raw ceramic blank, and then carrying out adhesive removal treatment under the protection of flowing inert gas to remove the binder; placing the raw ceramic blank subjected to glue removal in an atmosphere sintering furnace, and executing a multi-stage heating sintering procedure to form a ceramic body; and carrying out heat treatment on the sintered ceramic body, and then cooling to obtain the aluminum nitride substrate. The lattice thermal resistance of the aluminum nitride substrate is reduced, and the mechanical strength of the aluminum nitride substrate is improved.

Ceramic preform assembly for use in a method of manufacturing a metal matrix composite part may be formed by 3D printing and by sintering the ceramic preform to form a sintered preform. In the method, a liquid metal is introduced into the sintered preform to form the metal matrix composite part. The ceramic preform assembly may include at least one ceramic preform and an infiltrant reservoir connected to the ceramic preform.

An electronic component that comprises a laminate in which a plurality of low-temperature fired ceramic layers are laminated, wherein: the laminate is provided with a first layer that is positioned on one main surface and a second layer that is in contact with the first layer; the first layer and the second layer are formed from a low dielectric constant ceramic that contains a post-firing glass component (A1) and an oxide (C1) of a ceramic crystal component; the post-firing glass component (A1) is RO-Zno-Al2O3-B2O3-SiO2 wherein RO is at least one selected from the group consisting of MgO, CaO, SrO, and BaO; the ratio of RO, the ratio of ZnO, and the ratio of Al2O3 contained in the post-firing glass component (A1) are 0.1 mol% to 10 mol% inclusive; the sum of the ratio of RO, the ratio of ZnO, and the ratio of Al2O3 contained in the post-firing glass component (A1) is 15 mol% or less; the ratio (SiO2 / B2O3) of SiO2 and B2O3 contained in the post-firing glass component (A1) is less than 3.4; the oxide (C1) of the ceramic crystal component contains at least one selected from the group consisting of SiO2, BaAl2Si2O8, ZnAl2O4, and Zn2SiO4; and the amount of quartz contained in the first layer is smaller than the amount of quartz contained in the second layer.