108 results about "Electronic ceramics" patented technology

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 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 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 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 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 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.

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.

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.

The invention discloses a nano bismuth oxide powder preparation system, which sequentially comprises an electric arc evaporation unit, a gas phase reaction and condensation unit, a product collection and treatment unit and an intelligent control unit along a material flow direction, and is characterized in that the gas phase reaction and condensation unit adopts an integrally designed reaction settling chamber; through specific structural layout and flow field design, gas-phase oxidation of bismuth vapor and a condensation nucleation process of nanoparticles are decoupled and accurately controlled, and meanwhile, an online oxygen content and temperature monitoring and feedback control system is integrated, so that controllable preparation of the granularity and morphology of the nano bismuth oxide is realized. Through structure innovation and process reconstruction, short-process and continuous precision control of the gas phase oxidation reaction and the nano-particle condensation growth process is realized, the product purity is high, the morphology is uniform, and the method is suitable for the fields of high-end electronic ceramics, catalysts and functional materials.

1. The name of the design product: molybdenum rod tube furnace. 2. The use of the design product: for heat treatment of special ceramics, electronic ceramics, magnetic materials, glass, electronic devices, metals, etc. 3. The design points of the design product: in the combination of shape and pattern. 4. The picture or photo that best shows the design points: design 1 perspective view. 5. Design 1 is designated as the basic design.

The invention discloses a ZnO varistor uniformly doped with Y element and a sol-gel preparation method of the ZnO varistor, and belongs to the technical field of electronic ceramic materials. The preparation method comprises the following steps: (1) preparing a resistor raw material containing Y (NO3) 36H2O; (2) adding a citric acid solution into the yttrium nitrate solution to adjust the pH value to 3.0-5.0, adding polyethylene glycol, and performing ultrasonic treatment to obtain a precursor solution; (3) dropwise adding ammonia water, and pouring the Bi2O3 powder to form sol wrapping Bi2O3; (4) standing and aging to form wet gel wrapping Bi2O3 powder; (5) drying and calcining; (6) preparing total slurry; (7) preparing a green body; and (8) sintering to obtain the ZnO piezoresistor uniformly doped with the Y element. According to the preparation method, a sol-gel method is adopted, a citric acid complexing system is combined with polyethylene glycol, and the technical bottlenecks that in a traditional process, Y elements are prone to agglomeration, and the grain sizes are not uniform are solved through pH value gradient regulation and an ultrasonic dispersion process.

The invention provides a method and device for casting a metallized ceramic matrix and the metallized ceramic matrix, and relates to the field of electronic ceramic surface metallization. The method comprises the following steps: pre-punching ceramic substrates, carrying out surface treatment, and fixing a plurality of ceramic substrates in a mold cavity; then pressing the liquid metal into a mold cavity provided with the ceramic matrix through pressure, and cooling the mold cavity and an internal contained object to room temperature under the protection atmosphere of inert gas; and finally, after the mold is removed, the required multi-layer interconnected metallized ceramic matrix can be prepared. Compared with the prior art, the process is simple and convenient, the multiple layers of ceramic matrixes and the metal layers are integrally cast through the casting technology, interconnection of any layers of the multiple layers of ceramic matrixes is achieved by pressing in the liquid metal, and the metallized ceramic matrixes of any three-dimensional structure which are interconnected in a three-dimensional mode are obtained through the liquid metal.

The invention relates to the technical field of metal alloys, and particularly discloses an electronic ceramic element and a preparation method thereof. An electronic ceramic element comprises a ceramic core body and electrode layers arranged on the two sides of the ceramic core body respectively, raw materials of the electrode layers comprise copper and sacrificial elements, and the sacrificial elements comprise at least two of nickel, tin, silicon, sulfur, selenium, tellurium, titanium, phosphorus, manganese and aluminum; the weight ratio of each sacrificial element in the raw materials of the electrode layer in the electrode layer is 0.5%-2.0%; according to the invention, silicon, manganese and tin with high oxygen affinity are doped into the copper electrode material, so that the copper electrode material can preferentially react with oxygen, the binding force between the copper electrode and the ceramic core body is effectively improved, and good conductivity and oxidation resistance are maintained at the same time.

The invention discloses a green ceramic chip, a ceramic substrate and a preparation method, and relates to the technical field of electronic ceramics. According to the invention, the raw ceramic chip with a specific ratio is designed, the ceramic substrate containing multiple layers of raw ceramic chips is designed on the basis of the raw ceramic chip, and the ratio of the raw ceramic chip of each layer is controlled to enable the thermal expansion coefficient of each layer to meet gradient change, so that the problem that CTE of heterogeneous materials in system-level packaging is not matched is effectively solved; in addition, the sintering temperature of the green ceramic chip is higher, the mechanical strength is higher, and the ceramic substrate has higher impact resistance.

The application discloses a method for preparing nano yttrium oxide powder by solid phase grinding, wherein low-melting-point yttrium salt is dispersed by using molten dispersant, and yttrium element is uniformly dispersed on the dispersant matrix by vacuum heating and decomposition, so that yttrium precursor powder with high dispersity and without agglomeration can be obtained, and finally nano yttrium oxide powder can be obtained through calcination process. The particle size of the prepared yttrium oxide nano powder is 50-650nm, the specific surface area is 10-200m 2 / g, and the prepared yttrium oxide nano powder can be applied in the fields of electronic ceramic materials, fluorescent materials and other functional ceramics.

The application provides a preparation method of solid-phase nanometer barium titanate, and belongs to the technical field of electronic ceramic materials.The method comprises the following steps: mechanically activating titanium dioxide and barium carbonate respectively, wetly mixing and grinding, spray drying, thin layer calcining, and dry flexible grinding by using a grinding medium coated with a thermoplastic polymer material.The obtained powder has a D90 of less than or equal to 1.8 microns, a specific surface area of 2.0-10 m 2 / g, and a c / a of 1.008-1.011.The application solves the problems of the hydrothermal method, such as many defects, high cost, uneven particle size of the traditional solid-phase method, and impurity introduction, by using a combined process of mechanical activation-thin layer calcining-flexible grinding, so that nanometer barium titanate with high tetragonal phase, high purity and uniform particle size distribution is prepared, the miniaturization and high capacity of MLCC are met, the process is green and continuous, and the process is suitable for industrial production.

The invention discloses a green ceramic chip, a ceramic substrate and a preparation method, and relates to the technical field of electronic ceramics. According to the invention, the raw ceramic chip with a specific ratio is designed, the ceramic substrate containing multiple layers of raw ceramic chips is designed on the basis of the raw ceramic chip, and the ratio of the raw ceramic chip of each layer is controlled to enable the thermal expansion coefficient of each layer to meet gradient change, so that the problem that CTE of heterogeneous materials in system-level packaging is not matched is effectively solved; in addition, the green ceramic chip is higher in mechanical strength and heat conductivity coefficient, and the prepared ceramic substrate has higher impact resistance and can adapt to more application scenes.

This invention discloses a medium-entropy low-dielectric microwave ceramic, belonging to the field of electronic ceramic materials technology. Its preparation method includes the following steps: Step 1: Mixing MgO, CoO, and ZnO powders in an equimolar ratio to obtain mixture Z. Using deionized water as the grinding medium, mixture Z is ground in a ball mill using a wet grinding method until the particle size is less than 10 micrometers. The mixture is then dried to obtain a mixed powder. Step 2: Adding citric acid and ethylene glycol to a mixed aqueous solution of MgCl2, CoCl2, and ZnCl2, and heating and stirring, yields a mixed solution C. Step 3: Weighing whisker-based porous silica powder and adding it to the mixed solution C from Step 2, stirring, adjusting the pH with sodium bicarbonate, continuing stirring, heating, and then adding the mixed powder obtained in Step 1. After stirring, the mixture is filtered, pressed into shape, and sintered sequentially to obtain the medium-entropy low-dielectric microwave ceramic. The medium-entropy low-dielectric microwave ceramic prepared by this invention has low dielectric constant and low dielectric loss, exhibiting superior overall performance and meeting application requirements.

The utility model relates to the technical field of ceramic spraying processing, and discloses a spraying device for aluminum oxide electronic ceramics, which comprises a cabinet, a partition plate is fixedly mounted in the cabinet, a control box is arranged in the cabinet and below the partition plate, a rotating seat is fixedly mounted in the center of the top side of the partition plate, and the rotating seat is fixedly mounted in the cabinet. A supporting and positioning assembly used for positioning the cylindrical ceramic base material from the interior is arranged at the top of the rotating base, and uniform spraying assemblies used for spraying are arranged on the inner walls and the back wall of the left side and the right side of the machine cabinet correspondingly. A screw rod rotates in a lifting ring, then a supporting plate is driven to ascend and descend along with the lifting ring, namely, a rotating plate on one side is pushed and pulled, an abutting plate is supported to expand outwards, then a rubber pad is driven to abut against the inner wall of the cylindrical ceramic base material for positioning and supporting, and therefore the ceramic base material is conveniently positioned from the interior; the situation that the local part of the ceramic base material cannot be sprayed due to external clamping and positioning is avoided, and the spraying quality is improved.

The invention belongs to the technical field of electronic ceramic components and materials for wireless mobile communication and radio frequency electronic circuit systems, and particularly relates to a microwave dielectric ceramic material and a preparation method and application thereof. The prepared microwave dielectric ceramic material is excellent in comprehensive dielectric property, compact and uniform in structure, wide in preparation process temperature window and good in stability, an antenna prepared from the microwave dielectric ceramic material is excellent in performance in a target frequency band, the raw materials are easy to obtain, the cost is controllable, and the microwave dielectric ceramic material has good application prospects.