269 results about "Electronic ceramics" patented technology

The invention relates to the technical field of electronic ceramic materials, and particularly discloses a high-purity aluminum oxide ceramic substrate and a preparation process thereof. The high-purity aluminum oxide ceramic substrate is prepared from the following raw materials in parts by weight: 0.20 to 0.25 part of magnesium oxide, 0.35 to 0.55 part of zirconium oxide, 1.2 to 1.5 parts of dispersing agent, 60 to 65 parts of ethanol, 99.7 to 99.8 parts of aluminum oxide, 12 to 15 parts of adhesive, 6 to 9 parts of plasticizer and 50 to 55 parts of n-butyl alcohol, the adhesive is a mixture of polyvinyl butyral, water glass and modified paraffin. The prepared high-purity aluminum oxide ceramic substrate has excellent chemical stability and mechanical strength, and the obtained aluminum oxide ceramic substrate has better density, mechanical property and thermal stability by mixing various raw material components, and is not easy to break when subjected to bending load.

The invention relates to the technical field of electronic ceramic materials, and particularly discloses a microwave dielectric ceramic material and a preparation method thereof.The microwave dielectric ceramic material is prepared from, by mass, 75-95 parts of a first main material, 0-18.4 parts of a second main material, 0.03-3.9 parts of B2O3 and 0-13.5 parts of other components, and the first main material is SiO2. When the mass ratio of the B2O3 to the SiO2 is within a specific range, the crystal phase of the SiO2 can be stably converted into a quartz crystal phase, so that the cracking possibility of the microwave dielectric ceramic material is effectively reduced.

The invention relates to the technical field of electronic ceramic green bodies, in particular to a glue discharging method of an electronic ceramic green body. Comprising the following steps: step 1, ball-milling raw materials, and carrying out tape casting to obtain a ceramic green body; 2, the ceramic green bodies are subjected to powder coating and stacked into a stack, and laminated green bodies are obtained; 3, in the nitrogen atmosphere, primary glue discharging is conducted on the laminated green body, and a primary glue-discharged green body is obtained; 4, in the nitrogen atmosphere, the primary degummed green body is subjected to secondary degummed, and a secondary degummed green body is obtained; 5, under the nitrogen atmosphere, high-temperature vacuum carbon removal is conducted on the secondary rubber-removed green body, and a high-temperature carbon-removed green body is obtained; 6, under the nitrogen atmosphere, the high-temperature carbon-removed green body is rapidly cooled; and obtaining the electronic ceramic body.

The invention belongs to the field of electronic ceramic materials, and particularly relates to a method for preparing tape-casting slurry of a silicon nitride substrate, a stirring mill instead of a traditional ball mill is adopted in the early stage of preparing the tape-casting slurry, the dispersion effect of silicon nitride powder and a sintering aid can be effectively improved, the grinding time of the silicon nitride powder is effectively shortened, and the production cost is reduced. The phenomenon that the casting effect is affected due to the fact that the main powder is ground too fine is avoided, and it can be guaranteed that the sintering aid can be evenly distributed in the main powder; a small amount of a high-boiling-point solvent is added into a solvent system, so that the phenomenon that in the tape casting process, due to the fact that the surface of the slurry volatilizes too fast and peels, volatilization of the solvent in the lower layer of the slurry is hindered and uneven is avoided.

The invention provides a preparation method of a high-thermal-conductivity 99 aluminum oxide ceramic substrate, and belongs to the field of electronic ceramic materials. The method comprises the following steps: homogenizing and grinding a high-purity aluminum-containing compound and a modifier to obtain pretreated powder; mixing the pretreated powder with a carrier gas, and carrying out melt spheroidization to obtain a submicron spherical alumina precursor raw material; homogenizing and defoaming the submicron spherical aluminum oxide precursor raw material, an inorganic sintering aid, a dispersing agent, a binder, a plasticizer and a foam inhibitor in a solvent to obtain ceramic slurry; carrying out tape casting on the ceramic slurry to obtain an aluminum oxide green body; the alumina green body is subjected to rubber discharging, pre-sintering and sintering, and the 99 alumina ceramic substrate is obtained. The submicron spherical alumina powder is prepared through a melt spheroidizing process, the surface of the powder is smooth, particle size distribution is concentrated, grain boundary resistance between the powder is remarkably reduced, sintering densification is promoted, and therefore the technical problems that existing tape casting slurry is poor in stability and high in sintering temperature, and consequently microdefects are caused are solved.

The invention discloses an electronic ceramic automatic pressing device and method, belongs to the technical field of electronic ceramic pressing, and provides the following scheme that the electronic ceramic automatic pressing device comprises a ceramic pressing mechanism, and an adjustable mold mechanism is assembled on the ceramic pressing mechanism; materials are pushed into the die cavity through the material pushing assembly to complete primary feeding, then the support and the driving rod are driven by the compaction assembly to move downwards, the driving rod drives the rotating assembly to rotate through the cambered surface of the spiral groove, the rotating assembly drives the die cavity to rotate, and the centrifugal movement of the die cavity facilitates uniform distribution of raw materials; and secondly, the adjusting assembly rotates along with the die cavity, the pressing die drives the raw materials to enter the die cavity, the capacity of the die cavity is increased, then the material pushing assembly conducts feeding again, the operation of multiple times of small-amount feeding is conducted in this way, centrifugal movement is overlapped for multiple times during feeding every time, and therefore the feeding uniformity can be kept, and the production efficiency is improved. The compactness of the raw materials is facilitated.

The invention relates to the technical field of electronic ceramics, in particular to a low-cost ultra-low dielectric microwave dielectric ceramic material and a preparation method thereof.The low-cost ultra-low dielectric microwave dielectric ceramic material comprises, by mass, 4.1% of MgO, 36.4% of H2SiO3, 31.5% of Al2O3 and 28% of talc, talcum powder and Al2O3, H2SiO3 and MgO with the purity larger than or equal to 99% serve as initial raw materials, the microwave dielectric material Mg2.15 Al4Si5O18.15 is prepared through a solid-phase sintering method, and the microwave dielectric ceramic material is prepared through a microwave sintering method. The microwave performance of the material is excellent, the dielectric constant epsilon r is 3.82-4.42, the quality factor Q * f is 36653-64628 GHz, and the temperature coefficient of resonance frequency tau f is-26.02--24.80 ppm / DEG C. The ultra-low dielectric microwave dielectric ceramic material adopts talc to replace part of a silicon raw material and a magnesium raw material, the content of the silicon raw material and the magnesium raw material is greatly reduced, compared with the silicon raw material and the magnesium raw material, the talc is extremely low in cost, and the cost is low. The raw material cost is reduced, the preparation is easy, and great commercial potential is achieved. In addition, the added value of talc is improved, and development of related industries is promoted.

The utility model relates to the technical field of electronic ceramic production, in particular to a screening device used for electronic ceramics, the screening device is composed of a rotary vibration screening machine, a conveying table, a discharging table and a stamping table, ceramic small pieces which are arranged in sequence are placed on the table top of the conveying table, a detection straight rod and an installation block are arranged in the stamping table, and the detection straight rod is connected with the discharging table. The detection straight rod is perpendicular to the table top of the conveying table and is inserted into a through hole formed in the center of the small ceramic piece in the vertical direction, the installation block is parallel to the table top of the conveying table, and a pushing column for pushing the small ceramic piece to slide is arranged at the front end of the installation block. According to the electronic ceramic screening device, unqualified ceramic products are efficiently screened out, qualified products and the unqualified products are rapidly distinguished, the labor intensity of workers can be reduced, meanwhile, the screening efficiency of electronic ceramics can be improved, and assembly line work is optimized.

The invention provides a preparation method of nano indium tin oxide powder, and belongs to the technical field of preparation of electronic ceramic transparent oxide functional inorganic materials. The preparation method comprises the following steps: in an oxygen-containing environment, performing electric arc gasification on an indium tin metal melt, and oxidizing metal steam generated by the electric arc gasification to obtain the nano indium tin oxide powder, the current applied for generating the electric arc is 500 to 1200 A, and the voltage is 50 to 120 V. The preparation method provided by the invention is simple, the oxidation reaction time is short, no exhaust gas is discharged, and meanwhile, the problems of wastewater and waste acid discharge and difficult impurity removal caused by addition of strong acid are avoided. The preparation method provided by the invention can realize continuous production and is high in production efficiency; and the particle size D50 of the prepared nano indium tin oxide powder can be kept to be less than 0.5 mu m and D90 is less than 1 mu m.

The invention belongs to the technical field of electronic ceramic substrate materials, and particularly relates to a preparation method of a microcrystalline glass composite silicon nitride ceramic substrate, which is prepared from the following raw materials: 1-5% of alpha-phase silicon nitride powder, 86-95% of beta-phase silicon nitride powder, 0.2-3% of metal silicon powder, 2.5-8% of glass powder and 1.3-8% of metal oxide. The preparation method comprises the following steps: S1, mixing and grinding raw materials to obtain ceramic slurry; s2, adding Arabic gum into the ceramic slurry as a binder, and carrying out spray granulation; granulation powder is obtained; s3, carrying out dry pressing molding and cold isostatic pressing treatment on the granulation powder to prepare a ceramic plate blank; and S4, sintering and crystallizing the ceramic plate blank. According to the invention, the glass ceramic powder is introduced as a sintering aid and a second phase, and the sintering temperature of the silicon nitride is obviously reduced from the conventional temperature of more than 1800 DEG C to 1500 DEG C by utilizing the liquid phase effect of the glass ceramic powder in the sintering process, so that two modes of air pressure sintering and normal pressure sintering can be used, and the energy consumption and the requirements on equipment are reduced.

The invention discloses polyvinyl acetal resin for electronic ceramics and a preparation method of the polyvinyl acetal resin, and belongs to the technical field of high polymer materials. The method comprises the following steps: adding a first part of butyraldehyde and aldehyde A into an aqueous solution of polyvinyl alcohol, uniformly mixing, then adding an acid catalyst, and carrying out primary aldolization reaction to obtain a mixture 1; and adding a second part of butyraldehyde and aldehyde B into the mixture 1, uniformly mixing, carrying out secondary aldolization reaction, and adding an alkali solution to adjust the pH value, thereby obtaining the polyvinyl butyral resin. In a step-by-step aldehyde feeding manner, the reaction degree and the reaction rate are controlled by using an alkyl branched chain or aldehyde A containing a benzene ring branched chain, so that the viscosity of the system is slowly increased; and long-chain aldehyde B is utilized to increase the intermolecular distance and reduce cross-linking, and meanwhile, the glass-transition temperature of PVB can be further reduced, so that the long-chain aldehyde B can interact with a plasticizer and a solvent more easily in the pulping process, the compatibility of the long-chain aldehyde B is improved, and uniform preparation of PVB is realized.

The application provides a high-strength calcium-aluminum-silicon glass-ceramics and a preparation method thereof, and belongs to the field of electronic ceramic materials. The material composition is as follows: CaO is 15-25wt%, Al2O3 is 10-15wt%, SiO2 is 50-65wt%, and ZnO+BaO is 10wt%. The high-strength calcium-aluminum-silicon glass-ceramics provided by the application has the main crystal phase of wollastonite CaSiO3, the secondary crystal phase of barium feldspar BaAl2Si2O8 and quartz SiO2. By adjusting the Zn / Ba ratio, the bending strength 193MPa and the Young's modulus 79GPa are improved, the thermal expansion coefficient 5.11ppm / ℃ is improved, and the reliability of the ultra-large scale integrated circuit package is improved. In addition, the preparation method provided by the application has the advantages of low cost, simple process and the like, is beneficial to industrialized production, and has potential application value for the ultra-large scale integrated circuit package substrate.

The present invention belongs to the technical field of the preparation of electronic ceramic components. More specifically, it relates to a preparation method of a high temperature coefficient thermosensitive material. Graphene is uniformly mixed with ceramic powder. After reduction sintering, graphene is uniformly dispersed at the grain boundaries of barium titanate ceramic grains. During the reoxidation process, graphene is oxidized and removed to form two-dimensional pores, which serve as oxygen transmission paths to promote the reoxidation of the ceramic grain boundaries to form barriers, thereby preparing a high-density, low reoxidation temperature, high temperature coefficient porous barium titanate-based thermosensitive ceramic. The present invention can be applied to the existing preparation process of barium titanate thermosensitive ceramics. By adding only a small amount of graphene, the reoxidation temperature of barium titanate thermosensitive ceramics can be reduced, and a barium titanate thermosensitive ceramic with high density, a relatively high rise-to-resistance ratio, and a high temperature coefficient can be prepared.

The application provides high-curie-temperature low-resistance lead-free thermosensitive ceramic and a preparation method thereof, and belongs to the technical field of electronic ceramic elements. 1‑x‑y La x (Bi 0.5 Na 0.5 ) y )(Ti 0.9996 Mn 0.0004 )O3; wherein the value range of x is 0.001<=x<=0.004, and the value range of y is 0.001<=y<=0.0075. The preparation method comprises the following steps: mixing (Bi 0.5 Na 0.5 )TiO3 powder synthesized by two-stage heating hydrothermal method, (Ba 1‑x La x )TiO3 powder synthesized by solid-phase reaction method, Mn(NO3)2 aqueous solution and sintering auxiliary agent AST powder, then performing granulation, molding, glue removal and sintering. The barium titanate-based thermosensitive ceramic prepared by the method has extremely low room temperature resistivity and relatively high curie temperature.

The invention discloses a manufacturing method of a high-strength low-carbon-residue silicon nitride ceramic green body for electronic ceramics, which achieves the purpose of enhancing strength by increasing the content of PVB (polyvinyl butyral) in tape casting slurry or increasing the molecular weight of PVB because a three-dimensional network structure formed by PVB in the green body can be enhanced by larger addition amount of PVB and PVB with higher molecular weight. The green body defect caused by non-uniform dispersion of silicon nitride powder can be eliminated to a certain extent through PVB with larger molecular weight and more PVB increment, the strength and mechanical property of the green body are improved, meanwhile, the effect of electrostatic repulsion brought by the surface of the coated powder is improved through reasonable proportion matching of ammonium polyacrylate and ammonium citrate, and the strength and mechanical property of the green body are improved. Meanwhile, polyethylene glycol and salmon fish oil are creatively added and reasonably matched, the steric hindrance dispersion effect of large and small molecule matching is provided, the proportion of the four dispersion effect media is adjusted to be optimal, and under the condition that the high strength of the green body is guaranteed, the carbon content of the product obtained after glue discharging is low.

The invention discloses a preparation method of a high-porosity aluminum nitride powder precursor, and belongs to the technical field of electronic ceramics, and the preparation method comprises the following steps: S1, raw material mixing: uniformly stirring and mixing water, an aluminum source, a carbon source, aluminum sol and a thickening agent in proportion to form slurry; s2, stirring and foaming: adding a foaming agent into the uniformly mixed slurry in the step S1, and stirring and foaming until the volume of the slurry is increased to 2.5 times or more; s3, injection molding and solidification: adding a curing agent into the foamed slurry in the step S2, continuously stirring, then performing injection molding and solidification on the slurry to obtain an aluminum nitride precursor, and drying to obtain a high-porosity aluminum nitride powder precursor; s4, the dried high-porosity aluminum nitride powder precursor in the step S3 is put into a vacuum sintering furnace to be subjected to a carbon thermal reduction nitridation reaction, and the aluminum nitride powder is obtained.According to the method, the gas replacement circulation effect in the nitridation process can be optimized, the situation that a gas path is blocked due to collapse of precursor blocks is effectively prevented, and then the nitridation reaction stability and the powder quality are guaranteed.

The present invention discloses an electronic ceramic slurry and a preparation method thereof, and relates to the field of electronic ceramic processing technology. The method comprises the following steps: Step 1: Sol: S1.1: Prepare silicon nitride powder, sodium lauryl sulfate, modified polyvinyl alcohol, polyethylene glycol-400, sintering aid, and ethanol aqueous solution as materials; S1.2: Under a nitrogen atmosphere, place the materials in a mixing tank in sequence for homogenization to obtain a glue solution; Step 2: Ball milling and degassing: Transfer the glue solution to a ball mill, grind and slurry, meet the particle size requirements and scraping requirements, degas, and finally filter and remove iron to obtain an electronic ceramic slurry. Advantages: The present invention provides an automated continuous preparation method for electronic ceramic slurry, during which the adhesive polyvinyl alcohol is modified accordingly; at the same time, in order to improve the dispersion effect of the sintering aid, the surface of the diatomaceous earth is chemically modified so that it acts as a carrier of the sintering aid, effectively improving the quality of the product.

The invention discloses metatitanate ceramic with high temperature stability and a preparation method thereof, and belongs to the field of microwave electronic ceramic materials, the chemical composition of the metatitanate ceramic is (Mg1 / 2Zn1 / 2) 0.4 + x (Co1 / 3Ni1 / 3Mn1 / 3) 0.6-xTiO3, x is more than or equal to 0 and less than 0.6, and x is more than or equal to 0 and less than or equal to 1. The preparation method comprises the steps of material weighing, primary ball milling, pre-sintering, secondary ball milling, granulation, primary sintering, secondary sintering and the like. The temperature coefficient of resonance frequency of the ceramic is regulated and controlled through high entropy, five kinds of ceramic with tau f being about-50 ppm / DEG C under a single condition are optimized to-17 ppm / DEG C through a high entropy effect under the condition that no positive tau f material is added, meanwhile, epsilon r is equal to 19.74, Qf is equal to 1,500 GHz, and a new thought is provided for regulation and control of tau f.

The application provides a low-temperature co-fired ceramic powder material and a preparation method and application thereof, and relates to the technical field of electronic ceramic materials.The low-temperature co-fired ceramic powder material provided by the application comprises the following raw material components in parts by weight: borosilicate glass powder 50-60 parts, quartz glass powder 30-40 parts, and powder additives 5-10 parts, wherein the powder additives comprise at least one of Al2O3, ZrO2, MgO and BaO.The low-temperature co-fired ceramic powder material prepared by compounding borosilicate glass powder, quartz glass powder and powder additives has a dielectric constant εr=3.8-4.5 after sintering, a low dielectric loss tan δ=0.001-0.0025, and a resistivity ρ=1.0-9.9*10 12 Ω*cm, the sintering temperature is in the range of 850-900 DEG C, and the density after sintering is good, and can be up to 99.8%.

This invention relates to a high-power, low-loss Li-based microwave ferrite for LTCC and its preparation method, belonging to the field of electronic ceramics technology. The ferrite, based on its respective standard components, contains the following content: Li₂CO₃ 11.80–12.24 mol%, ZnO 19.87–20.41 mol%, TiO₂ 10.78–11.08 mol%, Mn₃O₄ 0.39–2.65 mol%, Co₃O₄ 0.04–0.58 mol%, Fe₂O₃ 54.70–56.18 mol%, and Bi₂O₃ 0.09 mol%. This invention introduces high-valence Mn ions into the Li-based microwave ferrite, altering the ferrite grain size distribution, particularly increasing the proportion of fine grains, thus improving the spin linewidth. Based on grain refinement, the introduction of an appropriate amount of Co ions with rapid relaxation characteristics further enhances the ferrite's spin linewidth.

The utility model relates to the technical field of tape casting processing, in particular to a tape casting solvent volatilization auxiliary device which comprises an operation table, a cushion table is arranged on the side edge of the operation table, an air heating pump is installed on the upper side of the cushion table, an air suction pipe and an air delivery pipe are installed on the air heating pump, and a tape casting solvent volatilization mechanism is arranged on the upper side of the operation table. The tape casting solvent volatilization mechanism comprises a volatilization bin, an exhaust cavity is formed in the side edge of the volatilization bin, and through openings are formed in the front side and the rear side of the volatilization bin. Due to the arrangement of the casting solvent volatilization mechanism, when the electronic ceramic sheet passes through the inner side of the volatilization bin, the upper side and the lower side of the electronic ceramic sheet are simultaneously subjected to uniform warm air action, so that the residual casting solvent on the electronic ceramic sheet is quickly and uniformly volatilized, and the volatilized gas is quickly guided out of the volatilization bin through the exhaust cavity on the side edge; and moisture regaining in the volatilization bin is avoided, the effect of rapidly drying the electronic ceramic sheets is achieved, the bonding condition generated in the subsequent processing or rolling process is avoided, and the practicability is improved.

The invention discloses a bio-based composite activating aid for producing active calcium phosphate by utilizing renewable resources as well as a preparation method and application of the bio-based composite activating aid, and belongs to the technical field of active calcium phosphate preparation. The bio-based composite active auxiliary agent is prepared from the following raw material components in parts by mass: 20 to 40 parts of bio-based organic acid or bio-based organic acid salt, 15 to 30 parts of polysaccharide or a derivative thereof, 25 to 45 parts of alkali metal silicate and 5 to 15 parts of alkali metal carbonate. According to the invention, the bio-based composite activating auxiliary agent is prepared through synergism of multiple components, and the bio-based composite activating auxiliary agent is matched with the phosphorus-containing solid waste to prepare the active calcium phosphate, so that integration of high-valued renewable resources, high performance of the active calcium phosphate and performance upgrading of electronic ceramics is realized, meanwhile, the auxiliary agent is ensured to be green and non-toxic, and is adaptive to various scenes, and the production cost and the environmental risk are reduced.

The utility model relates to the technical field of LoRa short-range wireless communication protocols of the Internet of Things, in particular to a remote control fuming exercise device capable of being put quickly, which comprises a front cover and a rear cover, a plurality of fuming holes are uniformly formed in one side of the front cover, an electronic ceramic heating sheet fixing plate is arranged in the front cover, and a plurality of electronic ceramic heating sheets are arranged in the electronic ceramic heating sheet fixing plate. The electronic ceramic heating sheet fixing plate is provided with an electronic ceramic heating sheet, and one side of the electronic ceramic heating sheet fixing plate is provided with a cavity in which a white smoke cake is stored, the device improves the reality of drilling, can remotely adjust the smoke amount and concentration according to the drilling requirement, enables the simulated scene to be closer to the real situation, and is more practical. The drilling effect is improved; the safety drilling efficiency is enhanced, the preparation time is shortened through rapid deployment and remote control, the drilling can be performed efficiently, and manpower and material resources are saved; the cost is saved, and the overall operation cost is reduced due to the design of ultra-low power consumption and the use of environment-friendly materials.

The invention discloses a method for preparing large-specific-gravity platinum powder from crude platinum, and belongs to the technical field of platinum group metal refining. According to the method, efficient purification of platinum and preparation of large-specific-gravity platinum powder are realized by adopting a combined precipitation method through the core steps of dissolving for liquid preparation, ammonium chloride precipitation, dissolving for impurity removal, acidification precipitation, reduction and the like. The method comprises the following specific steps: dissolving crude platinum with aqua regia to prepare a crude platinum solution, precipitating with ammonium chloride to generate ammonium chloroplatinate, dissolving with a special reagent to remove platinum group metal and base metal impurities, acidifying, precipitating, further purifying, and finally reducing with a liquid phase to obtain the large-specific-gravity platinum powder. The method is short in technological process, easy in process control, simple in operation equipment and suitable for large-scale production, the product purity is higher than 99.99% of sponge platinum requirements in the national standard GB / T-1419, the tap density is larger than 3.5 g / mL, and the method has wide application value in multiple fields of jewelry, chemical engineering, medicine, electronics, ceramics and the like.

This invention discloses a conductive paste for metallization of electronic ceramics, belonging to the field of electronic materials technology. The conductive paste for metallization of electronic ceramics of this invention includes copper alloy powder, glass powder, and an organic carrier. By controlling the ratio of copper, aluminum, and zinc in the copper alloy, the thermal expansion coefficient of the alloy is adjusted, making it compatible with electronic ceramic substrates such as alumina ceramics and zinc oxide varistors, achieving metallization through sintering under air conditions. The addition of tin improves the solderability of the metallized layer, meeting the process requirements of electronic components. The glass powder added in this invention has a low initial melting temperature, high bonding strength with the copper alloy, and strong adhesion to the ceramic substrate; combined with a specific ratio of organic carrier, it effectively improves the conductivity of the metallized layer after sintering.

The utility model discloses a quick ejection device for an electronic ceramic workpiece, which comprises a first jig plate, a first placing hole is arranged on the first jig plate, an ejection plate is arranged at the bottom of the first jig plate, an ejection column is arranged on the ejection plate, a first positioning hole is arranged on the ejection column and the first jig plate, and a second placing hole is arranged on the first positioning hole. And a positioning pin is arranged on the ejector plate and is matched with the first positioning hole. The jig further comprises a second jig plate, a second containing hole is formed in the second jig plate, the diameter of an inlet of the second containing hole is larger than that of the first containing hole, a second positioning hole is formed in the second jig plate, and the second positioning hole is matched with the positioning pin. The positioning pin is arranged on the ejector plate in a sliding mode, and a reset spring is arranged between the positioning pin and the ejector plate. The problems that an existing ceramic grinding jig cannot achieve rapid discharging and is inconvenient to use are solved.

The utility model relates to a raw material mixing device for electronic ceramic production, which comprises a mixing tank, a feeding control structure, a belt pulley I, supporting legs and a cloth bag cylinder, a supporting column and a supporting plate are arranged at the top end of the mixing tank, and the feeding control structure is arranged above the supporting plate. Opening and closing of the opening and closing plates below the fixing ring can be controlled by controlling rotation of the gear ring, the mixing tank is controlled by a first belt wheel on a supporting shaft beside the mixing tank, the first belt wheel is connected with a second belt wheel through a belt to achieve driving, the cloth bag cylinder is arranged above the supporting plate, and a first connecting ring and a second connecting ring are arranged at the top end and the bottom end of the cloth bag cylinder respectively. The position distance between the first connecting ring and the second connecting ring can be controlled through the telescopic air cylinder, and the discharging barrel is connected to an additionally-arranged discharging structure. The feeding device has the advantages that the designed feeding control structure can be automatically controlled to be opened and closed, so that the feeding control structure can be automatically in butt joint with the first connecting ring and an assembly on the first connecting ring when feeding is needed, and the trouble and the labor of manual operation are avoided.

The invention discloses an industrial preparation method of nano yttrium oxide for electronic ceramics, belonging to the field of rare earth hydrometallurgy technology. The invention first dissolves yttrium oxide in nitric acid to remove anionic impurities in yttrium oxide, then removes impurities through (NH4)2S solution to obtain a high-purity yttrium nitrate solution, then precipitates yttrium carbonate crystals through ammonia water and ammonium bicarbonate solution, and finally calcines and decomposes to obtain nano yttrium oxide for electronic ceramics. The yttrium oxide obtained by the invention is nano-sized, has a high specific surface area, and is easy to disperse. It is suitable for the electronic ceramic industry, especially for industrial production, and has broad application prospects.

This invention belongs to the field of electronic ceramics and their manufacturing, and relates to a calcium aluminum borate microcrystalline glass material with a low coefficient of thermal expansion and its preparation method. This invention uses CaCO3, Al2O3, and H3BO3 as raw materials, obtaining a glass material through high-temperature melting and water quenching, followed by granulation and sintering to obtain a microcrystalline glass material with CaAl3BO7 as the main crystalline phase. The glass material, after melting and holding at 1300℃ for 1 hour and water quenching, and then sintering at 850–950℃, exhibits excellent dielectric properties and low thermal expansion characteristics: the dielectric constant is between 7.41 and 9.14; the sample sintered at 925℃ with a 10wt.% excess of H3BO3 has a Q×f value as high as 28561 GHz (@15.725 GHz), a flexural strength of 140 MPa, and a coefficient of thermal expansion of 3.08 × 10⁻⁶. ‑6 With a coefficient of thermal expansion of 1 / K, which is similar to that of silicon semiconductor materials, it can meet the thermal-electric-mechanical performance requirements of microwave dielectric ceramic substrate materials, and has the potential to be used as a packaging substrate material.

The invention belongs to the field of electronic ceramics and manufacturing thereof, and relates to a ZnO-TiO2-based microwave dielectric ceramic material and a preparation method thereof, the chemical general formula of the ceramic material is (Zn < 0.98-x > Mg < x >) < 1-y > (Mn < 1 / 2 > Ni < 1 / 2 >) < y > Ti < 1 + z > O < 3 >, y is equal to 0.01 to 0.03; z is equal to 0.06 to 0.1; the material is prepared by a sol-gel method, the principal crystalline phase of the phase is ZnTiO3, and the sintering temperature is 825-900 DEG C. By adopting a sol-gel preparation process, synthesis of a ZnTiO3 phase in a low temperature range (825-900 DEG C) is realized, and the problem that the ZnTiO3 phase is easily decomposed into a Zn2TiO4 phase and a TiO2 phase during high-temperature sintering (gt, 900 DEG C) is solved. The ceramic forming performance of the microwave dielectric ceramic material is improved, and a high quality factor and a near-zero temperature coefficient are obtained.