25 results about "Sintered ceramic" patented technology

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.

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.

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.

A low-temperature fired ceramic that contains a fired glass component represented by RO—ZnO—Al2O3—B2O3—SiO2, wherein RO is at least one selected from the group consisting of MgO, CaO, SrO, and BaO, a percentage of RO, a percentage of ZnO, and a percentage of Al2O3 in the fired glass component are each 0.1 mol % to 10 mol %, a sum of the percentage of RO, the percentage of ZnO, and the percentage of Al2O3 in the fired glass component is 15 mol % or less, and a ratio of a percentage of SiO2 to a percentage of B2O3 (SiO2 / B2O3) in the fired glass component is less than 3.4; and one or more oxides of ceramic crystalline components that include at least one selected from the group consisting of SiO2, BaAl2Si2O8, ZnAl2O4, and Zn2SiO4.

This application provides a method for preparing a 3D-printed ceramic core, comprising: providing a photocurable 3D-printed ceramic slurry; performing a DLP photocurable 3D-printed ceramic core preform based on the ceramic slurry; debinding and first-time sintering the ceramic core preform to obtain a pre-sintered ceramic core; providing an alumina sol; performing a vacuum impregnation treatment on the pre-sintered ceramic core using the alumina sol; and performing a second-time sintering on the vacuum-impregnated ceramic core to obtain the 3D-printed ceramic core. This application achieves a good balance between high strength, high porosity, good surface quality, and controllable performance in the ceramic core.

Air treatment device comprising: - a sintered ceramic part (2) having a total porosity greater than 40%, - an air circulator (3) configured to generate an airflow to be treated through the ceramic part.

A low-temperature fired ceramic substrate 1 comprises: a low-temperature fired ceramic 11 containing a fired glass component (A1) and an oxide (C1) of a ceramic crystal component; and pores 17. The oxide (C1) of the ceramic crystal component contains a ZnAl2O4 crystal. When subjected to measurement at 6 GHz by a perturbation method, the low-temperature fired ceramic substrate 1 demonstrates a relative dielectric constant of 3.8 or less and a Q value of 1500 or more.

A method for making a covering element (1) comprising the phases of: preparing a geopolymerizable composition having a precursor (12) of sintered ceramic material, preferably obtained from a ceramic production process, and an activator (14); forming said composition to obtain a body (2); activating the geopolymer reaction of the composition; and optionally making a top layer (3) on said body (2), said top layer having at least one decorative layer (6).

The present invention relates to the technical field of the preparation of ceramic rollers. Disclosed are a microwave sintering method and microwave sintering equipment for a ceramic roller. The microwave sintering method of the present invention comprises the following steps: conducting microwave sintering by using a microwave sintering kiln, wherein the microwave sintering kiln comprises a sintering cavity and an outer cavity surrounding the sintering cavity, the outer cavity is provided with a focusing reflector, and a heating zone, a sintering zone and a cooling zone are sequentially formed in the sintering cavity from top to bottom; starting a microwave source, and adjusting the working frequency and power of the microwave source to make the temperature of the sintering zone be 1200-1600ºC; placing an auxiliary heating base in the sintering cavity; and enabling the ceramic roller to enter and pass through the sintering cavity at the speed V1 to undergo microwave sintering while maintaining a rotary motion, so as to obtain a microwave sintered ceramic roller. The microwave sintering method and microwave sintering equipment for a ceramic roller of the present invention can achieve effective microwave sintering of an aluminum oxide ceramic roller, the temperature for the microwave sintering of the ceramic roller reaches 1200ºC or higher, and the ceramic roller can be heated more evenly by means of dynamic continuous sintering.

The application belongs to the technical field of ceramic dielectric, and discloses a preparation method of calcium-doped barium titanate powder and ceramic and application of the calcium-doped barium titanate powder. The preparation method of the calcium-doped barium titanate powder comprises the following steps: adding a calcium source, a barium source and a titanium source into water to obtain a precursor mixed solution; adding a mineralizer into the precursor mixed solution to adjust the pH value of the precursor mixed solution to be greater than 14; sequentially performing first-step hydrothermal reaction and second-step hydrothermal reaction on the precursor solution after the pH value is adjusted to obtain calcium-doped barium titanate precipitate; and performing suction filtration, washing, drying and grinding on the calcium-doped barium titanate precipitate to obtain the calcium-doped barium titanate powder. The calcium-doped barium titanate powder prepared by the application has the characteristics of good dispersibility and high tetragonal phase content, and the sintered ceramic not only has a high Curie temperature, but also has a high dielectric constant and low dielectric loss, which can well meet the development requirements of the dielectric layer in the multilayer ceramic capacitor product.

This invention belongs to the field of powder preparation technology, and relates to a hydrothermal synthesis method for sintering rod-shaped magnesium-aluminum spinel transparent ceramics. The method includes: dissolving Mg(NO3)2·6H2O, Al(NO3)3·9H2O, and a precipitant in water, and adding ammonia and ethylene glycol to form a mixed solution; transferring the mixed solution to a hydrothermal reactor for reaction to obtain rod-shaped MgAl2O4 powder; adding a composite sintering aid of CaF2 and Y3Al5O4 to the rod-shaped MgAl2O4 powder, ball milling and drying to obtain the powder to be sintered; pouring the powder to be sintered into an SPS graphite mold with radial constraint, compacting the powder, and then sintering it in an SPS sintering furnace to obtain the sintered ceramic; annealing and polishing the sintered ceramic to obtain a MgAl2O4 transparent ceramic sample. This invention achieves a synergistic improvement in the optical transmittance and mechanical properties of transparent ceramics.

This ceramic substrate comprises a base material that contains a sintered body of ceramic particles (A) and a covering material that contains a sintered body of α-alumina particles (B). The base material has a support surface. The covering material covers the entire support surface of the base material. The average particle diameter of the α-alumina particles (B) is smaller than the average particle diameter of the ceramic particles (A).

This ceramic substrate has a support surface. The ceramic substrate comprises: a base material that is a sintered body of ceramic particles (A); and a covering that is a sintered body of ceramic particles (B). The support surface has a covered portion and a margin portion. The margin portion has a first margin portion and a second margin portion. The first margin portion and the second margin portion are respectively disposed on the support surface at end portions on both sides in one direction along the support surface so as to sandwich the covered portion. A first electrode is disposed on the support surface so as to cover the first margin portion. A second electrode is disposed on the support surface so as to cover the second margin portion.

This invention belongs to the field of ceramic slurry pump technology, specifically relating to a ceramic pump impeller and its installation method. It includes an impeller body, a hub insert, and a hub seal. A flow channel is provided on the front cover plate of the impeller body, and an insert groove and a seal groove are sequentially formed on the rear cover plate. The inner circle of the hub insert is mounted on the pump's main shaft, and the outer circle of the hub insert is mounted in the insert groove. The hub seal is mounted in the seal groove and covers the hub insert. Both the hub insert and the hub seal are provided with radial facets. One set of adjacent radial edges in the insert groove and the seal groove are aligned. The forward tilt angle of the front cover plate on the impeller body gradually increases near the shaft hole. The impeller body and hub seal are made of sintered ceramic. The mating surfaces between the impeller body, hub insert, and hub seal are filled with structural adhesive and a curing agent. The beneficial effects of this invention are: improved wear resistance and corrosion resistance of the ceramic pump impeller, increased strength, and increased service life under harsh working conditions.

A sputtering target material includes a sintered ceramics of an oxide containing potassium, sodium, niobium, and oxygen, wherein when a volume resistivity at 25° C. is less than 6.0×1011 Ω·cm, a Vickers hardness is 460 or more, and a flexural strength is 90 MPa or more, or wherein when a volume resistivity at 25° C. is 6.0×1011 Ω·cm or more, a Vickers hardness is 250 or more, and a flexural strength is 90 MPa or more.

This utility model discloses a high-temperature sintered ceramic ball forming mold, relating to the technical field of high-temperature sintered ceramic ball forming molds. It includes a lower mold and an upper mold located vertically above the lower mold. Both the lower and upper molds have internal cavity structures, and multiple mold openings are equidistantly spaced between them. A spherical mold is installed in each mold opening, and a semi-circular mold groove is formed in each spherical mold. A blocking ring is fixedly connected between the mold grooves at the upper and lower ends of the spherical mold. This utility model uses a connecting column threadedly connected to the spherical mold, facilitating timely replacement when the spherical mold malfunctions, improving the convenience of mold use and enabling mold replacement. Furthermore, the use of an air pump and an electric telescopic rod facilitates the upward ejection of ceramic balls via a push rod, improving the efficiency of ceramic ball forming and discharging, thus achieving rapid ceramic ball discharge and solving the problem of low ceramic ball forming efficiency.

This invention discloses a silicon nitride-bonded silicon carbide sintered ceramic material for pumps and its preparation method. The ceramic material comprises the following raw materials in the following weight proportions: 55-70 parts silicon carbide particles; 10-15 parts silicon powder; 5-15 parts ferrosilicon-chromium alloy powder; 5-10 parts water-soluble phenolic resin powder; 5-10 parts purified water; 0.5-3 parts defoamer; 3-5 parts sintering aid; and 3-5 parts dispersant. The preparation method involves: uniformly mixing the raw materials and injecting the mixture into a mold for room temperature curing; then drying at 50-180℃ for 1-7 days before demolding; reheating to 1350-1450℃ for sintering; and finally repeating the vacuum impregnation and drying process 2-3 times to obtain the target product. The ceramic material prepared by this invention significantly improves the surface hardness of ceramic parts, thereby enhancing their wear resistance.

This invention provides a ceramic component in which the surface of the ceramic component is left as is after firing (fired surface), and the surface roughness of the ceramic component is increased to make it difficult for fired particles to peel off from the surface, thereby suppressing particle generation. [Solution] The ceramic member 1 according to the present invention is a fired ceramic member 1 having ceramics as its main component and further containing silica, wherein the surface 1a of the ceramic member is the as-fired surface, and in a 1000 μm square region at any point on one main surface of the as-fired ceramic member, there are 21 to 160 recesses 2, the average diameter of the openings 2a is 1 μm or more and 35 μm or less, and the maximum depth 2b is 1 μm or more and 35 μm or less, and the arithmetic mean height Sa of the region is 2 μm or more and 5 μm or less.

The application provides a high-reliability DPC ceramic substrate and a preparation method thereof, and the preparation method comprises the following steps: (1) after an active metal seed layer is arranged on the upper and lower surfaces of a ceramic substrate, sintering treatment is performed to obtain a sintered ceramic substrate; (2) a patterned mask layer is formed on the surface of the active metal seed layer of the sintered ceramic substrate, and copper layer thickening treatment is performed on the exposed surface of the active metal seed layer; (3) the patterned mask layer is removed, and the active metal seed layer not covered by the copper layer is etched and removed to form an independent circuit pattern, thereby obtaining the high-reliability DPC ceramic substrate. Through the sintering treatment after the introduction of the active metal seed layer, the stress concentration of the thickened copper layer and the ceramic substrate during the cold and hot cycle is effectively slowed down, and the reliability of the DPC ceramic substrate is greatly improved.

The invention relates to a dental furnace for firing dental-ceramic compounds, comprising a combustion chamber (20) for receiving ceramic elements (14) to be fired. The heating of the combustion chamber (20) is carried out using a heating device (24). The heating device (24) is connected to an evaluation device (26) via a resistance measuring device (25). The temperature in the combustion chamber (20) and / or an operating state of the dental furnace can be determined using the evaluation device (26).

This application provides an automatic detection method and system for the branch circuit of the metallization process of ceramic wafer capacitors, belonging to the field of semiconductor technology. Specifically, it includes setting up a detection branch circuit on the main production line of ceramic wafer capacitors, and equipping the detection branch circuit with a sorting and sampling unit, a branch circuit detection unit, and a central control unit. The main production line continuously transports sintered ceramic wafers to the metallization process. Based on a preset sampling strategy, the central controller controls the sorting and sampling unit to dynamically extract ceramic wafer samples from the main production line without interrupting the main production line, and sends the ceramic wafer samples to the branch circuit detection unit for detection. The detection results are uploaded to the central control unit in real time for quality analysis and dynamic response judgment. Based on the judgment results, a fault alarm is issued or a hard-wired shutdown signal is sent to the main production line control unit. This application improves the efficiency and accuracy of quality inspection and effectively avoids the production stoppage problems caused by traditional sampling inspection methods.

The application provides sintered aeolian sand ceramic sand and a preparation method thereof. The sintered aeolian sand ceramic sand of the application uses aluminum slag as aluminum material and steel slag powder as a fluxing component to prepare sintered ceramic sand, and turns industrial waste into treasure. The application uses aeolian sand powder as silicon material to prepare sintered aeolian sand ceramic sand with a large amount of aeolian sand powder, which plays a positive role in the sustainable development of mineral resources and the resource utilization of aeolian sand. The sintered aeolian sand ceramic sand prepared by the application has a bulk density less than 1200kg / m 3 , a cylinder compressive strength more than 22MPa, a 1h water absorption less than 10%, and belongs to high-strength light aggregate. The product has excellent performance by reasonably controlling the formula ratio.

Specifically, a ceramic substrate comprising a core / shell structure material as a coating layer is disclosed. The core / shell structure material, containing various physical properties such as plasma resistance and durability, and comprising materials similar to or identical to the substrate, is coated onto a sintered ceramic substrate exhibiting excellent volume resistivity at high temperatures and excellent thermal conductivity at room temperature. This improves plasma resistance, durability, particle resistance, volume resistivity, and thermal conductivity. The ceramic substrate comprises a ceramic plate layer; and a coating layer located on the ceramic plate layer and formed by sintering the core / shell structure material. The ceramic plate layer comprises alumina (Al₂O₃) and aluminum nitride (AlN) but not a second phase of aluminum oxynitride (AlON). The coating layer has a structure in which the granular phase constituting the shell forms a continuous phase along the particle boundaries of the core granular phase.

The application discloses a boron nitride supporting furnace for sintering ceramic substrates, which comprises one or more ceramic substrate supporting assemblies which are sequentially nested and stacked from bottom to top; each of the ceramic substrate supporting assemblies comprises a groove type supporting plate and a pressing plate arranged in the groove type supporting plate; the middle part of the groove type supporting plate is a first groove part for placing a ceramic substrate; and the shape and size of the pressing plate are matched with those of the first groove part, and the pressing plate is arranged on the ceramic substrate in the first groove part. The application provides the boron nitride supporting furnace which can greatly improve the yield of the ceramic substrates.

The application relates to the technical field of ceramics, and particularly discloses a kind of green special refractory ceramic slurry and a preparation method and application thereof.The green special refractory ceramic slurry comprises alumina, methyltrimethoxysilane-phosphoric acid modified polysiloxane, fluorocarbon emulsion, expanded vermiculite powder, silane coupling agent modified feldspar tailings powder, dispersant, organic silicon defoaming agent, polyurethane curing agent and deionized water.The green special refractory ceramic slurry provided by the application has excellent high-temperature stability, corrosion resistance, thermal shock resistance and mechanical strength after sintering, solves the problems of low high-temperature upper limit and poor corrosion resistance of traditional slurry, makes the sintered ceramic adapt to severe high-temperature working conditions such as the inner lining of converter in a steel plant and the inner wall of a high-temperature reaction kettle in a chemical plant, and meets the long-term protection needs of industrial equipment.