441 results about "Ceramic sintering" patented technology

The present invention relates to the technical field of porous conductive ceramics. Disclosed are a selective laser sintering porous conductive ceramic 3D printing consumable and a preparation method. The selective laser sintering porous conductive ceramic 3D printing consumable comprises the following components in percentage by weight: 30-60 wt% of modified silicon carbide powder, 10-40 wt% of conductive phase powder, 10-30 wt% of a polymer binder, and 0.1-5 wt% of a lipid. The selective laser sintering porous conductive ceramic 3D printing consumable is obtained by means of a direct mixing ball milling method or a xylene solution mixed washing method. A porous conductive ceramic green body is printed by means of a laser 3D printer, and is subjected to thermal debinding and sintering to obtain a ceramic sintered part.

The invention belongs to the field of ceramic material production, and relates to a high-thermal-conductivity silicon carbide ceramic material and a preparation method thereof. The preparation method comprises the following steps: mixing silicon carbide powder, cane sugar, boric acid, a dispersing agent and water to prepare slurry; on the basis that the total mass of the silicon carbide powder, the carbon element obtained after cane sugar is debonded, the boron element in the boric acid and the dispersing agent is 100 wt.%, the adding amount of the carbon element obtained after cane sugar is debonded is 1.0 wt.%-2.5 wt.%, and the adding amount of the boron element in the boric acid is 0.1 wt.%-0.3 wt.%; drying, sieving, forming and debonding the slurry to obtain a ceramic body; and sintering the ceramic green body at normal pressure to obtain the high-thermal-conductivity silicon carbide ceramic material. The water-soluble sucrose and boric acid are added as sintering aids to be mixed with the silicon carbide powder, so that the uniform dispersity of the sintering aids is improved, and finally, the use amount of the sintering aids is effectively reduced while the sintering densification of the ceramic is ensured, thereby reducing the adverse effect of a second phase and internal impurities on the thermal conductivity of the silicon carbide ceramic as much as possible.

The invention relates to an MPC-based high-precision ceramic sintering process improvement method, and belongs to the technical field of ceramic material manufacturing processes. The MPC-based high-precision ceramic sintering process improvement method comprises the following steps: data acquisition and modeling: acquiring temperature data in a sintering furnace in real time by a plurality of temperature sensors, and establishing a dynamic model of the sintering furnace; a model prediction control algorithm is designed, an MPC controller is designed according to the established dynamic model, and the controller can predict the temperature change trend in a period of time in the future; by optimizing the control strategy, the energy consumption can be reduced, the production cost can be reduced, the temperature sensors can comprehensively cover the whole sintering area, the multiple temperature sensors are used for collecting temperature information of different positions in the sintering process in real time, accurate data are improved, and quick response of the system is achieved. And meanwhile, the quality consistency of ceramic products can be improved, and the requirements of high-end markets are met.

The invention discloses a simulation test method for ceramic sintering stress and a method for reducing the ceramic sintering stress. The simulation test method comprises the following steps: 1, measuring the grain size, the relative density and the geometric size before and after sintering; 2, establishing a ceramic geometry by using Abaqus, and constructing a transient heat conduction model; 3, establishing a viscoelastic constitutive equation of sintering shrinkage deformation of the zirconia ceramic, and constructing a sintering shrinkage model; and 4, sequentially coupling the transient heat conduction model and the sintering shrinkage model, and implementing joint simulation of solid-phase sintering simulation to obtain a sintering stress simulation result of the ceramic. The method for reducing the ceramic sintering stress comprises the following steps: 5, establishing a ceramic sintering shrinkage finite element model with grain sizes distributed in proportion, and calculating average sintering stress distribution of the grain size proportion distribution model; and 6, comparing the average sintering stress of the sintering shrinkage models with different grain size proportions, and determining a method for reducing the sintering stress. The ceramic sintering quality and the production efficiency are improved.

The invention discloses a temperature field real-time monitoring method and system based on special ceramic sintering, and relates to the field of temperature monitoring of special ceramic sintering, and the method specifically comprises the following steps: S1, processing a sensor array; s2, construction of multi-parameter data acquisition; s3, a temperature field reconstruction and prediction model based on multi-physics field coupling; and S4, temperature field real-time monitoring and abnormity early warning are carried out. According to the temperature field real-time monitoring method and system based on special ceramic sintering, the temperature sensor is preset in the green body, a three-dimensional temperature field reconstruction function is combined, discrete sensor node real-time temperature data can be converted into a continuous three-dimensional temperature field cloud picture, temperature distribution of the surface of the green body can be clearly presented, and the temperature field can be monitored in real time. And the temperature gradient change from the surface layer to the core can be more accurately restored, so that an operator can intuitively master the temperature state of the whole green body, the situation that the whole process is misjudged due to local data is avoided, and the comprehensiveness and accuracy of temperature field monitoring are fundamentally improved.

The invention relates to the technical field of ceramic intelligent manufacturing, in particular to a ceramic firing process thermal deformation intelligent prediction and self-adaptive temperature precise regulation and control system, which comprises a multi-source sensing module (a thermal infrared camera array, a temperature sensor, a laser displacement meter and a powder characteristic analyzer); a hybrid prediction model (a space-time convolutional neural network constrained by a physical mechanism); and the self-adaptive temperature control actuator comprises a partitioned burner group, a quenching / slow cooling pipeline and a gas-air volume decoupling controller. According to the scheme, through a multi-mode perception-hybrid modeling-dynamic optimization full-process closed-loop architecture, the single-point technical limitation of existing patents is broken through, and the zero-defect precise manufacturing target of ceramic firing is achieved.

The invention discloses an intelligent temperature-controlled track kiln for sintering red mud-based ceramics, and relates to the technical field of track kilns, comprising: a bracket, in which input tracks and output tracks are distributed up and down; an upper tunnel kiln, in which the input track is located, and is used for preheating ceramics and drying glaze; a lower tunnel kiln, in which the output track is located, and is used for cooling and curing ceramics; a vertical kiln, which is used for heating and sintering ceramics, and is provided with a three-dimensional spiral track inside, in which the input end of the spiral track is connected to the input track, and the output end is connected to the output track, and the upper tunnel kiln and the lower tunnel kiln are connected to the vertical kiln to realize continuous processing of ceramics from preheating to sintering and then to cooling; a plurality of connecting channels are distributed between the upper tunnel kiln and the lower tunnel kiln, and a fan is installed in each connecting channel; the invention has the beneficial effects of continuous processing flow, efficient thermal energy utilization, air flow optimization, strong adaptability, and the like.

The invention discloses a ceramic sintering optimization method and system based on dynamic monitoring, and relates to the technical field of sintering. The method comprises the following steps: synchronously obtaining a sintering data set of a ceramic sample in a sintering process under a plurality of sintering process conditions in situ; based on the sintering data set, densification kinetic models corresponding to the multiple sintering process conditions respectively are established; and determining a plurality of isodensity lines on the basis of the densification dynamic models corresponding to the plurality of sintering process conditions, and constructing a dynamic prediction model on the basis of the plurality of densification dynamic models and the plurality of isodensity lines, so as to optimize the sintering process parameters on the basis of the dynamic prediction model. The method depends on a dynamic monitoring means, the mass change rate and the size change rate in the sintering process can be synchronously obtained in situ, comprehensive dynamic monitoring data are provided, a densification mechanism in the sintering process can be accurately understood or captured, the optimization effect of sintering process parameters is improved, and therefore the performance of a ceramic material is improved.

The invention provides a ceramic device positioning mechanism of ceramic sintering processing equipment, and relates to the technical field of positioning, the ceramic device positioning mechanism comprises a feeding guide rail, the left end and the right end of the feeding guide rail are fixedly provided with transmission plates; a transmission groove is formed in the outer side of the transmission plate; a supporting piece is installed on the top of the feeding guide rail in a sliding mode. And a T-shaped push rod is fixedly mounted at the rear end of the supporting piece. When the mounting piece and the limiting piece complete mission and restore outwards, the limiting stop block can automatically retract into the mounting piece under the guidance of a corresponding mechanical structure to relieve stopping and limiting of the limiting piece, and due to the design, when the limiting piece is not in a use state, a worker can rapidly and conveniently disassemble and assemble the limiting piece, and the working efficiency is improved. The problems that a positioning contact element is often fixedly installed on a positioning mechanism, in order to ensure the positioning accuracy and stability, a plurality of contact elements are usually arranged, and the process is tedious and time-consuming once the contact elements need to be replaced are solved.

The invention discloses low-temperature sintering equipment for a ceramic material, and relates to the technical field of ceramic sintering. The equipment comprises a heating part, a graphite crucible and a heating spiral pipe connected to alternating current are used, low-melting-point ceramic powder is heated and melted, an integrated temperature management module is driven by a cooling pump through magnetic force, the low-temperature working state of the heating spiral pipe is kept, and the cooling pump utilizes a permanent magnet rotating disc and a magnetic plate; cooling liquid circulation without mechanical contact, efficient separation and cooling of high-temperature cooling liquid are achieved, heat absorbed by the heat absorption pieces is effectively dissipated through the cooling fins and the cooling fan, the system further comprises a switching assembly, an operator is allowed to flexibly switch between an internal cooling system and an external cold water source, and in addition, the system is convenient to operate. The equipment adopts the structural design of the separation barrel and the external sleeve barrel, heat loss is reduced through vacuum, and the heating efficiency is improved.

To provide an electrode-embedding member and a manufacturing method thereof, which can suppress the intrusion of oxygen between a connecting member and a ceramic sintered body, suppress deterioration of the connecting member, and extend the product life compared to conventional products.SOLUTION: An electrode-embedded member 100 includes a base 110 formed in a flat plate shape from a ceramic sintered body whose main component is AlN, an electrode 120 embedded in the base 110, and a connection member 130 made of W or Mo and electrically connected to the electrode 120 and embedded in the base 110, and a porous layer 132 made of W or Mo is formed at the interface between the connection member 130 and the ceramic sintered body.SELECTED DRAWING: Figure 1

The invention belongs to the field of preparation of nano composite materials, and mainly relates to a nano additive with a'core-shell 'structure as well as preparation and application of the nano additive. And the core-shell structure nano additive comprises three kinds of core part materials and a shell layer coating material. For example, the material of the core part comprises nano natural tourmaline powder, nano selenium and nano silver, and the material of the shell part is silicon dioxide. Wherein the three core part materials respectively have the effects of generating and releasing negative ions, releasing selenium elements and resisting bacteria. In the ceramic sintering process, the coating'shell 'layer protects the chemical composition and the phase structure of the'core' material from being damaged; and the material coated with the'shell 'layer can be diffused into the ceramic material in the ceramic sintering process, so that the selenium element and the antibacterial metal element of the'core' part are controllably released. The core-shell structure nano additive is added into the pottery clay, and the multifunctional health-care ceramic material is obtained by sintering under the condition of medium and high temperature, so that the aim of controlling the release of selenium, antibacterial agent silver and negative ions is fulfilled.

The invention discloses a ceramic firing performance prediction method based on a GA-BP neural network, and the method comprises the steps: data collection and preprocessing, gray correlation analysis and screening of key process parameters, construction of a GA-BP neural network model, model training and verification, prediction model testing, and firing performance index prediction. By means of unique intelligent algorithm fusion, the problems of high experience dependence, high experiment cost, long period, low efficiency, time consumption, energy consumption, high efficiency and the like of a method for judging the ceramic firing performance through artificial experience in actual ceramic firing production are effectively solved. The technical problem that multi-target collaborative optimization is difficult to realize at the same time in the prior art is solved, remarkable advantages are shown in the aspects of prediction precision, intelligent degree and the like, the requirements of intelligent, green and high-quality ceramic firing process optimization are met, and the method has wide application prospects and important practical value.

To provide a semiconductor substrate processing base in which even when an unintended external force is applied to the semiconductor substrate processing base, internal stress is relieved and the effect of the external force is suppressed, a substrate holding member, and a method for manufacturing the same.SOLUTION: A semiconductor substrate processing base 100 comprises a ceramic base 110 formed by a ceramic sintered body having a media flow path 118, and an Al film 120 formed on the surface of media flow path 118. This allows unintended external forces applied to the media semiconductor substrate processing base to be mitigated by the plastic deformation of the Al film, thereby suppressing the effects of stress.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of boron carbide ceramics, and relates to a preparation method of boron carbide ceramics with a rare earth silicon carbon compound as a sintering aid. The invention discloses a preparation method of boron carbide ceramic taking a rare earth silicon carbon compound as a sintering aid, which comprises the following steps: mixing the sintering aid rare earth silicon carbon compound RExSiyCz and B4C according to the mass ratio of (0.1-10): (90-99.9), drying, sieving, pre-pressing and sintering to obtain the boron carbide ceramic taking the rare earth silicon carbon compound as the sintering aid. According to the invention, the rare earth silicon carbon compound is added into B4C as a sintering aid, and a liquid phase is formed by using the rare earth silicon carbon compound, so that the particle rearrangement and mass transfer process of the ceramic raw material can be promoted, the ceramic sintering temperature is reduced, and the sintering densification degree is improved.

The invention provides a preparation method of an ErBCO superconducting target, and belongs to the technical field of oxide target materials.The preparation method comprises the steps that firstly, erbium nitrate, barium nitrate, copper nitrate, high-purity water, a dispersing agent and a binding agent are sequentially mixed, and then mixed powder is obtained through segmented ball milling and spray granulation; then the ErBCO superconducting target material is prepared through the method that the mixed powder is sequentially subjected to calcination, cold sintering and drying treatment, the effect of reducing the cost while the performance such as the density of the target material is improved is achieved through the cold sintering process, and the ErBCO superconducting target material has the advantages that the ceramic sintering temperature is remarkably reduced, and the sintering time is remarkably shortened.

To provide a technique for improving oxidation resistance of a ceramic sintered body.SOLUTION: The ceramic sintered body including first specified elements consisting of five or six types of elements selected from titanium (Ti), vanadium (V), zirconium (Zr), niobium (Nb), molybdenum (Mo), hafnium (Hf) tantalum (Ta), and tungsten (W), a second specified element consisting of one type of element selected from yttrium (Y) and aluminum (Al), and a carbon element (C), is characterized in that the sum of the first specified elements, the second specified element and the carbon element included in the ceramic sintered body is 98 atom% or greater, the amount of the second specified element included in the ceramic sintered body is 3000 atom.ppm or less, the amount of carbon included in the ceramic sintered body is 45 atom% or greater and 55 atom% or lower, and a single-phase structure with the first specified elements solid-solved therein is present in the ceramic sintered body.SELECTED DRAWING: Figure 4

The invention relates to the technical field of ceramic membranes, in particular to a ceramic sintering aid and application thereof. The ceramic sintering aid is prepared from, by weight, 2-4 parts of manganese dioxide and 4-8 parts of modified aluminum powder, the modified aluminum powder comprises aluminum particles, and the surfaces of the aluminum particles are wrapped with epoxy resin layers. The mass ratio of the aluminum particles to the epoxy resin is (2-3): 1. Based on the fact that low-valence manganese ions are not resistant to corrosion, the corrosion resistance of the manganese ion-containing ceramic is improved by wrapping the ceramic particles with the corrosion-resistant layer. Meanwhile, the melting point of aluminum oxide is extremely high, and a coating layer is very difficult to form, so that aluminum powder is coated with resin, ceramic is sintered in an inert gas atmosphere, the resin is gasified at a high temperature, and aluminum is molten to form a liquid phase to coat raw material particles; after cooling, the atmosphere is changed into an air atmosphere, so that the molten aluminum is oxidized to form a compact aluminum oxide layer, low-valence manganese oxide which is easily corroded by acid is isolated, and the high-compactness and corrosion-resistant performance of the ceramic is achieved.

To provide a manufacturing method for a multilayer electronic component in which reduction in quality caused by a mold release film is prevented and provide a mold release film used for the same.SOLUTION: A manufacturing method for a multilayer electronic component 1 includes a step for coating one surface of a mold release film 100 with a ceramic slurry and forming a ceramic green sheet 10, a step for printing an internal electrode pattern 12 on the ceramic green sheet 10, a step for laminating the ceramic green sheets 10 and obtaining a laminated body 2, a step for obtaining a ceramic sintered body 4, and a step for forming an external electrode 6. The mold release film 100 includes a substrate 102 and a mold release layer 110. A counter layer 2000 is provided on the surface of the substrate 102 on which the mold release layer 110 is not provided.SELECTED DRAWING: Figure 3

A method for manufacturing a ceramic ball material according to an embodiment, includes: a step of producing a ceramic green compact; a step of performing a plurality of times of a CIP process on the ceramic green compact to produce a CIP (cold isostatic pressing) green compact; and a step of sintering a CIP green compact produced by a final CIP process among the plurality of times of the CIP process to produce a ceramic sintered compact. In the step of producing the CIP green compact, after a former CIP process among the plurality of times of the CIP process is performed, an orientation of a CIP green compact produced by the former CIP process is changed, and a latter CIP process is performed.

The invention discloses a preparation method of a MgO-MgA12O4-ZrO2 nano ceramic eutectic composite material. The preparation method comprises the following steps: S1, preparing powder; s2, flash firing preparation; and S3, high-temperature melting preparation. According to the invention, two technologies of flash sintering and high-temperature melting are combined, the problems of high sintering temperature, easy growth of crystal grains, difficult densification and the like of the traditional eutectic ceramic are solved, and an excellent composite material with a nanoscale eutectic structure is finally obtained; a nanocrystalline blank obtained through flash sintering is crushed and then subjected to high-temperature melting, microdefects and air holes possibly existing in the flash sintering blank are eliminated, the chemical components and the microstructure of a final product are more uniform, and compared with traditional selective laser melting, the method is more convenient and faster to implement and lower in cost.

The ceramic granules are configured such that: (1) the average packing ratio is 25-60 vol%, the average disintegration strength is 0.01-0.60 MPa, and the ratio of the in-granule defect diameter to the granule diameter is 0.30 or less; or (2) the average disintegration strength is 0.01-0.60 MPa, the ratio of the in-granule defect diameter to the granule diameter is 0.30 or less, and the flow function in a ceramic granular layer formed by filling the ceramic granules and compacting the ceramic granules at a vertical stress (load) of 1-90 kPa is 3.0 or more.

The utility model relates to the technical field of ceramic production, in particular to a water-saving type ceramic firing blank grinding machine which comprises an operation table, a first clamping block is arranged above one end of the operation table, the middle of one side of the first clamping block is rotationally installed on a connecting base through a connecting shaft, and a pushing mechanism is vertically installed in the middle of the other side of the connecting base. The pushing mechanism is fixed to the operation table through a first fixing base. A second clamping block is correspondingly arranged on the side, away from the connecting base, of the first clamping block, a driving shaft is connected to the middle of the other side of the second clamping block, and the other end of the driving shaft is rotationally installed on the second fixing base. When the water-saving type ceramic sintered blank grinding machine is used and the ceramic sintered blank is ground through the elastic effect of the elastic piece, the end opening of the ceramic sintered blank can be inserted from the second clamping block, so that the elastic piece can be supported on the inner wall of the ceramic sintered blank, and the side wall of the ceramic sintered blank is supported; and the ceramic body cannot be broken due to pressure in the polishing process.

A ceramic sintered body contains a first particular element consisting of five or six elements selected from among titanium (Ti), vanadium (V), zirconium (Zr), niobium (Nb), molybdenum (Mo), hafnium (Hf), tantalum (Ta), and tungsten (W); a second particular element consisting of one element selected from yttrium (Y) and aluminum (Al); and elemental carbon (C). The total amount of the first particular element, the second particular element, and elemental carbon is 98 at % or more. The ceramic sintered body has a plurality of microstructures having respective compositions different from one another. One of the plurality of microstructures includes a solid solution containing at least three members of the first particular element.

The invention discloses a sintering furnace for preparing low-dielectric ceramic, and relates to the technical field of ceramic preparation. The sintering furnace comprises a sintering furnace body, a separation cage, a rotary switching mechanism and a collection box, the sintering furnace body comprises an outer furnace body and an inner furnace body, and the inner furnace body is fixedly installed in the outer furnace body. The separation cage is pushed into the inner furnace body, so that the low-dielectric ceramic is located in a cage cover of the separation cage, and in the glue discharging stage of low-dielectric ceramic sintering, the separation rotating plates are rotated, so that the separation rotating plates in the outer ring are converted into the mutually-attached sealing state from the interval state pointing to the axis, and the low-dielectric ceramic sintering is achieved. When gas and solid waste are generated during glue discharging of the low-dielectric ceramics, solid dust and particles fall onto the surfaces of the partition rotating plates which are tightly arranged, the gas drives powder on the partition rotating plates and powder on the low-dielectric ceramics to be discharged out of the furnace, and the situation that the powder falls onto a heating part in the inner furnace body is avoided; and the phenomena of oxidation, corrosion, non-uniform temperature distribution and the like of a heating part are avoided.

A method for producing a ceramic sintered body includes: preparing a molded body containing a nitride fluorescent material having the composition containing Si; N; at least one alkaline earth metal element M1; and a metal element M2 being at least one selected from the group consisting of Eu, Ce, Tb, and Mn, to obtain a composition as described in the disclosure; obtaining a first sintered body by performing primary calcination of the molded body; obtaining a second sintered body by performing secondary calcination of the first sintered body in contact with a solid composed of a molybdenum metal or an alloy containing molybdenum as a main component; and obtaining a third sintered body by performing third calcination of the second sintered body while being placed in a container containing a metal having a melting point higher than that of the molybdenum metal.

The present invention relates to the field of ceramic materials, specifically a high bending resistance ceramic material for 5G communication base stations and a preparation method thereof. The steps include: calcination preparation of bending resistance sintering aids; preparation of HA-coated ceramic sintering powder; composite and column sintering of ceramic particles. The present invention uses polyacrylamide / L-dopamine membrane as an organic template to induce HA mineralization, which ensures that the HA crystal forms an ordered structure, so that the crystal obtains good mechanical properties, effectively reduces the problem of porosity in ceramics caused by grain growth, and improves the density of ceramics. In addition, some pores and cracks are inevitably generated in the ceramic green body during the sintering process. When the finished ceramic is subjected to an external load, the cracks will continue to expand. At this time, the HA crystals and cracks meet to consume the energy of the external load, thereby enhancing the strength of the ceramic and greatly improving the bending resistance of the ceramic material.

The present application belongs to the technical field of silicon nitride ceramic production, and in particular, relates to a silicon nitride ceramic sintering production device and a production method thereof, comprising a sintering cylinder and a guide rail arranged inside the sintering cylinder, a moving frame is arranged inside the guide rail, two fixed connecting rods arranged in parallel are arranged on the moving frame, the fixed connecting rods are provided with clamps rotating around the fixed connecting rods, the two clamps on the two fixed connecting rods cooperate to clamp the silicon nitride ceramics, the fixed connecting rods are provided with torsion springs, the sintering cylinder comprises an upper straight section, a lower straight section and a central inclined section located between the upper straight section and the lower straight section, the partition of the sintering cylinder can divide the sintering cylinder into different sintering spaces and make each sintering space have a different sintering temperature, and the silicon nitride ceramics are sintered and produced by first installing the silicon nitride ceramics, then exhausting, and then sintering in different areas.

The invention discloses a process for improving boron carbide plate sintering qualification, and belongs to the technical field of boron carbide ceramic sintering, and the technical scheme is characterized in that the process comprises the following steps: step 1, raw material preparation: grinding a boron carbide raw material into boron carbide powder in a sand mill, adding a caking agent, a plasticizer, a dispersing agent and a defoaming agent, and mixing and stirring to obtain a raw material; 2, discharging: adding a sintering aid into the prepared raw materials, putting the raw materials into a mold, and introducing inert gas into the mold; and 3, sintering is conducted, specifically, the mold is put into a hot-pressing sintering furnace to be sintered, the temperature rising time is prolonged by 300-600 DEG C during sintering, and pre-pressing is conducted for 100 T when sintering is conducted at the temperature of 1800 DEG C. The craft ceramic product is high in sintering qualification rate, high in compactness and high in stability.

A ceramic sintered body contains a first particular element consisting of five or six elements selected from among titanium (Ti), vanadium (V), zirconium (Zr), niobium (Nb), molybdenum (Mo), hafnium (Hf), tantalum (Ta), and tungsten (W); a second particular element consisting of one element selected from yttrium (Y) and aluminum (Al); and elemental carbon (C). The total amount of the first particular element, the second particular element, and elemental carbon is 98 at % or more. The ceramic sintered body has a plurality of microstructures having respective compositions different from one another. One of the plurality of microstructures includes a solid solution containing at least three members of the first particular element.