183 results about "Electronic ceramics" patented technology

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 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 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 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 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 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.

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.

The application belongs to the technical field of electronic ceramic materials, and particularly relates to a high-performance Y5P type barium titanate-based ceramic material sintered in air atmosphere and a preparation method thereof. The ceramic material takes BaTiO3 as a main raw material, is supplemented with MgCO3, ZnO, MnCO3, ZrO2, Nb2O5 and La2O3 as composite modification additives, and after sintering in air atmosphere, the ceramic material forms a dense and uniform microstructure, has excellent dielectric properties: a dielectric constant (ε) is 2800-3500, a dielectric loss tangent (tan δ) is as low as 1.1% or below, a volume resistivity (ρ) is 1.0*10 12 Ω·cm or above, a content temperature change rate is-9.8%-+9.1% in a temperature range of-30 DEG C to 85 DEG C, and meets a Y5P type temperature characteristic standard (ΔC / C 25 ℃≤±10%). The material can realize high insulation resistance, low loss and stable temperature characteristics by being directly sintered in air, does not need a complex reduction and reoxidation process, is suitable for preparing ceramic capacitors with high reliability and low cost, and is particularly suitable for the fields of consumer electronics and industrial electronics with medium-high voltage and high stability requirements.

The invention relates to the field of electronic ceramic substrates, provides a preparation method of a black aluminum oxide substrate, and solves the defects of low heat conductivity and low mechanical strength of the existing black aluminum oxide substrate due to the defects of a preparation process. The preparation method comprises the following steps: (1) preparing raw materials; (2) preparing slurry; (3) tape casting; (4) discharging glue; (5) sintering; (6) annealing; and (7) surface treatment.

The invention discloses a cleaning method for electronic ceramic parts, and belongs to the technical field of electronic ceramic materials. In order to improve the cleaning effect of the electronic ceramic parts, the invention provides a cleaning method which comprises the following steps: preparing a cleaning solution from EDTA (Ethylene Diamine Tetraacetic Acid), citric acid and water according to the mass ratio of (0.8-1.2): (0.8-1.2): 200; after the cleaning liquid is heated, ultrasonic cleaning is conducted at the ultrasonic power of 160 + / -40 W and the temperature of 40 + / -10 DEG C; then alkaline water or acid water is heated, and ultrasonic cleaning is conducted at the ultrasonic power of 160 + / -40 W and the temperature of 40 + / -10 DEG C; and performing primary cleaning, secondary cleaning, dewatering and drying to finish cleaning. The EDTA and the citric acid are combined, the ultrasonic synergistic effect is utilized for cleaning, the advantages of the EDTA and the citric acid are brought into full play, corrosion to cleaned objects is reduced, and the efficient and environment-friendly cleaning effect with small damage to the objects is achieved.

The utility model discloses a material receiving device for reducing impurities on the surface of a wafer type electronic ceramic green body, which comprises a strip-shaped pipeline with an upward notch and a vibration mechanism capable of driving the strip-shaped pipeline to vibrate, and is characterized by further comprising a negative pressure dust collection mechanism, the negative pressure dust collection mechanism is provided with a plurality of dust collection nozzles, a plurality of dust filtering through holes are formed in the groove bottom of the strip-shaped pipeline from front to back, the number of the dust filtering through holes is the same as that of the dust collection nozzles, the dust filtering through holes and the dust collection nozzles are in one-to-one correspondence, and dust collection openings of the dust collection nozzles are located below the corresponding dust filtering through holes. The strip-shaped pipeline is made of stainless steel. According to the utility model, the wafer type electronic ceramic green body is conveyed in a vibrating manner, and impurities in the strip-shaped pipeline are adsorbed and collected through negative pressure, so that the impurities on the surface of the wafer type electronic ceramic green body can be reduced, the surface of the ceramic green body is kept clean, and the production quality and reliability are improved.

This invention provides a method for preparing high-purity ultrafine yttrium oxide, relating to the field of ultrafine oxide powder preparation technology. The method involves removing impurities from a 5N-6N grade yttrium chloride solution to obtain a yttrium chloride solution with low non-rare earth impurities. While emulsifying and shearing an ammonia solution, the low-non-rare earth impurity yttrium chloride solution is introduced into the solution via atomization until the pH of the resulting solution reaches 8-10, yielding a yttrium hydroxide colloidal solution. While emulsifying and shearing the yttrium hydroxide colloidal solution, an oxalic acid solution is introduced into the solution via atomization until the pH of the resulting solution reaches 1.8-2.5. The solution is then filtered to obtain ammonium oxalate yttrium precipitate. Finally, calcination yields high-purity ultrafine yttrium oxide powder. This invention can prepare high-purity ultrafine yttrium oxide with a purity of 99.999-99.9999%, D... 50 The diameter is 0.3–0.5 μm, D 90 With a diameter of less than 1.0 μm, it is suitable for applications such as transparent ceramics and electronic ceramics.

The invention discloses an anti-surge ceramic capacitor material and a preparation method thereof, and belongs to the technical field of electronic ceramic materials. The material is prepared by taking high-purity barium titanate (BaTiO3) as a basic raw material and cooperatively doping lanthanide oxide (La2O3) and transition metal carbonate (MnCO3) as a grain boundary regulating agent through a solid phase method. The ceramic capacitor material is prepared from the following components in mol percent: 96 to 98 mol percent of BaTiO3, 1 to 2.5 mol percent of La2O3 and 0.5 to 2 mol percent of MnCO3, and the sum of the mol percent of all the components is 100 percent. According to the invention, La < 3 + > and Mn < 2 + > are synergistically segregated on a grain boundary, so that a compact grain boundary layer is formed, grains are refined, defects are inhibited, and the surge breakdown resistance (greater than or equal to 10 kV / mm) is remarkably improved. The material has a wide application prospect in surge frequency scenes such as an alternating current circuit and a power supply module.

This invention discloses a high-entropy aluminate-based microwave dielectric material with a near-zero temperature coefficient of resonant frequency, belonging to the field of microwave electronic ceramic materials. The chemical composition of this material is: [MgZnCa]. (1‑2x) / 3 [CoNi] x Al2O4, where 0.10≤ x ≤0.30, 1.52R≤Δ S ≤1.61R, Δ S In addition to representing the configuration entropy, this invention also discloses a method for preparing the above-mentioned material, including steps such as weighing, ball milling, drying, calcination, secondary ball milling, drying, granulation, molding, debinding, and sintering. The microwave dielectric material provided by this invention has a low dielectric constant (6.79~8.87) and a near-zero temperature coefficient of resonant frequency (~-12 ppm / ℃), thus having high application prospects in the field of next-generation mobile communications.

A preparation method of aluminum hydroxide with a high α-Al2O3 content, the aluminum hydroxide with a high α-Al2O3 content and its application, including adding α-Al2O3 seeds to a sodium aluminate solution, and inducing the precipitation and decomposition of aluminum hydroxide by the seeds, and separating and washing to obtain aluminum hydroxide with a high α-Al2O3 content. In this application, α-Al2O3 with different processing performances produced by different processes is selected as the raw material, and a series of products of ultrafine α-Al2O3 powder with high activity and narrow distribution can be prepared through grinding and sorting. Through the parameter regulation of the seed-induced decomposition process, a series of products with different particle sizes and crystal morphologies can be produced. The content of α-Al2O3 in the aluminum hydroxide product prepared in this application is 1-15%, and it can be regulated, providing high-quality raw materials for soft polishing and fine polishing, and can be applied to fields such as refractory materials, electronic ceramics, grinding and polishing materials, and catalyst carriers.

This application discloses a method for fabricating conductive lines on a multilayer co-fired ceramic substrate and the multilayer co-fired ceramic substrate itself, relating to the field of electronic ceramic multilayer co-fired manufacturing technology. The method for fabricating conductive lines on the multilayer co-fired ceramic substrate includes: providing a green ceramic film strip for multilayer stacking and co-firing; forming conductive patterns on the surface of the green ceramic film strip using nanoimprinting technology, aligning and stacking it with at least one other green ceramic film strip, and laminating it to form a stack; and performing adhesive removal and co-firing treatment on the stack to form embedded conductive lines within the stack. The fabrication method proposed in this application can fabricate conductive lines with linewidths and spacings less than 50 μm, achieving embedded forming of conductive lines in multilayer structures. It can be used in conjunction with via drilling / filling and stack alignment processes for precision packaging of three-dimensional integrated circuits such as high-density multilayer wiring, high-frequency and high-speed circuits, and power electronic integration.