A high dielectric constant high reliability porcelain dielectric capacitor and a ceramic material and a preparation method thereof based on a particle size combination type substrate

Abstract

The application discloses a high-dielectric-constant high-reliability porcelain dielectric capacitor, a ceramic material based on a particle size combination type base for preparing the porcelain dielectric capacitor, and a preparation method of the porcelain dielectric capacitor. The ceramic material is prepared by mixing a particle size combination type barium titanate base and a modified dopant. The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, a CZ material and a BLBS material. The porcelain dielectric capacitor prepared by using the ceramic material has the following excellent performances: a high dielectric constant (≥ 3500), a smooth dielectric temperature characteristic curve (X7R requirement is met), a low loss (≤ 3.5%), a high insulation resistance (RC@25 DEG C ≥ 3000 M omega * mu F) and high reliability (MTTF@75 V 125 DEG C ≥ 350 h).

Description

TECHNICAL FIELD

[0001] The application belongs to the field of ceramic materials for capacitors, and particularly relates to a high-dielectric-constant high-reliability porcelain dielectric capacitor and a ceramic material based on a particle size combination type substrate for preparing the same and a preparation method. BACKGROUND

[0002] Multilayer ceramic capacitors (MLCC) are a kind of chip capacitors, and their main functions are bypass, decoupling, filtering and energy storage, etc. With the pursuit of high performance, miniaturization and low cost of electronic devices, high-capacity high-reliability base metal MLCC has become the mainstream product of capacitor products, and higher requirements have been put forward for the ceramic materials used by the same.

[0003] The ceramic material for multilayer porcelain dielectric capacitors as the dielectric layer in MLCC determines the final performance of the MLCC product. High-capacity MLCC requires the ceramic material used to have the characteristic of high dielectric constant, and generally adopts barium titanate material with high dielectric constant as the substrate. Barium titanate belongs to ferroelectric, and its Curie temperature is near 130 DEG C. The temperature coefficient of pure barium titanate is large, and the dielectric loss is high, which cannot meet the use requirements of multilayer porcelain dielectric capacitors. In addition, base metal MLCC needs to be co-fired in a reducing atmosphere, while barium titanate will lose oxygen to form oxygen vacancies in a reducing atmosphere, which will reduce the insulation resistance and reliability. Therefore, it is necessary to modify barium titanate by doping, and optimize its temperature characteristics, dielectric loss, insulation resistance, reduction resistance, reliability, etc. so that the ceramic material can meet the application requirements after being made into MLCC.

[0004] For the ceramic material used for large-capacity high-reliability base metal MLCC, the biggest challenge is how to obtain high dielectric constant while meeting high reliability requirements. When large-capacity MLCC requires the thickness of the dielectric layer to be thinner and thinner, the particle size of barium titanate used in the ceramic material also needs to be finer and finer to ensure the number of crystal grains and grain boundaries in the dielectric layer, so as to meet the insulation resistance and reliability requirements of the capacitor. However, the finer the particle size of barium titanate, the lower the tetragonality and the 90-degree domain, which leads to a lower dielectric constant. When the dielectric constant of the ceramic material is low, in order to meet the capacity requirements of the MLCC, the thickness of the dielectric layer needs to be designed to be thinner, and thinner dielectric layer means higher unit electric field strength during work, which is not conducive to reliability. High-dielectric-constant ceramic materials generally use barium titanate with large particle size, but the grain size is large after sintering, which is not suitable for the application of thin-layer MLCC. Therefore, how to obtain high dielectric constant while making the ceramic material have high reliability, good electrical properties and be suitable for the application of thin-layer base metal MLCC is a problem to be solved by the present application. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art, and provides a ceramic material prepared based on a particle size combination type base, and another aim is to provide a high dielectric constant and high reliability porcelain dielectric capacitor prepared based on the ceramic material and a preparation method thereof.

[0006] The present application adopts the following technical solutions:

[0007] A ceramic material prepared based on a particle size combination type base is composed of the following raw materials in parts by weight: a particle size combination type barium titanate base 100 parts, and a modified dopant 0.9-9.0 parts.

[0008] The particle size combination type barium titanate base comprises the following raw materials in parts by weight: BT1 barium titanate 50-95 parts, and BT2 barium titanate 5-50 parts.

[0009] The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, and BLBS material in a weight ratio of 0.07-0.35:0.05-0.49:0.02-0.16:0.48-3.28:0.10-2.54:0.08-0.77:0.13-1.34.

[0010] Further, the BLBS material is synthesized from barium metaborate, lithium carbonate, and silicon dioxide in a molar ratio of 0.5-2.0:0.5-2.0:0.5-2.0.

[0011] Further, the CZ material is synthesized from calcium carbonate and zirconium dioxide in a molar ratio of 0.5-2.0:0.5-2.0.

[0012] Further, the BT1 barium titanate has a particle size of 250nm-500nm, and the BT2 barium titanate has a particle size of ≤200nm.

[0013] Further, the rare earth oxide A is one or both of dysprosium oxide and holmium oxide, and the rare earth oxide B is one or both of yttrium oxide and ytterbium oxide.

[0014] A preparation method of a ceramic material prepared based on a particle size combination type base comprises the following steps:

[0015] Step one: synthesizing the CZ material by a solid phase method: calcium carbonate and zirconium dioxide are added into a sand mill in a predetermined ratio, and are sand milled for 2-8h with pure water as a medium, and then are dried and crushed, and are calcined at 1150-1250℃, and then are ground in the sand mill with pure water as a medium to a particle size of less than 200nm, and then are dried and crushed to obtain the CZ material;

[0016] Step two, solid phase synthesis of BLBS material: the barium metaborate, lithium carbonate, silicon dioxide are added into the sand mill according to the ratio, and are sand milled for 2-8h with pure water as medium, and are dried and crushed, and then are calcined at 500-700℃, and then are ground in the sand mill with pure water as medium until the particle size is less than 200nm, and then are dried and crushed to obtain the BLBS material;

[0017] Step three, modification of the dopant grinding: the magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, BLBS material are added into the sand mill according to the ratio, and are ground with pure water as medium until the particle size is less than 200nm to obtain the modified dopant slurry;

[0018] Step four, preparation of the particle size combined matrix high dielectric constant and high reliability ceramic material: the BT1 barium titanate and BT2 barium titanate are added into the modified dopant slurry in step three, and are sand milled for 2-8h, and then are dried and crushed to obtain the ceramic material.

[0019] A high dielectric constant and high reliability ceramic dielectric capacitor is made of the ceramic material in any one of the above.

[0020] A preparation method of a high dielectric constant and high reliability ceramic dielectric capacitor, the ceramic material in any one of the above is used as the dielectric material, the nickel electrode is used as the inner electrode, the copper electrode is used as the outer electrode, and the ceramic dielectric capacitor is obtained by the processes of ceramic slurry preparation, casting, printing, lamination, water pressure, slicing, degreasing, sintering, chamfering, end copper, and burning.

[0021] From the above description of the present application, compared with the prior art, the beneficial effects of the present application are:

[0022] First, the ceramic dielectric capacitor prepared by the ceramic material defined in the present application has high dielectric constant (≥3500), smooth dielectric temperature characteristic curve (X7R requirement), low loss (≤3.5%), high insulation resistance (RC@25℃≥3000MΩ·μF), and high reliability (MTTF@75V 125℃≥350h) and other excellent performances.

[0023] Second, by combining two different particle sizes of barium titanate, on the basis of 250-500nm barium titanate, adding a certain amount of fine particle barium titanate with particle size ≤200nm, the ceramic material can obtain high dielectric constant, high insulation resistance, high reliability. Among them, the particle size of 250-500nm barium titanate forms a moderate grain size after sintering, so that the system maintains a high c / a ratio and enough domains, so that the ceramic material has high dielectric constant characteristics; the addition of fine particle barium titanate with particle size ≤200nm makes the dielectric layer have more grains and grain boundaries, which has a stronger pinning effect on carriers, thereby improving the insulation resistance and reliability of the system; in addition, fine particle barium titanate can fill the gap between larger particle barium titanate particles, improve the density of the product, and also help to improve the insulation resistance and reliability. The combination of barium titanate with different particle sizes introduces a new adjustable variable, and two or more barium titanates with different particle sizes can be selected and the relative proportion can be adjusted to obtain better performance that cannot be obtained by a single particle size barium titanate, thereby widening the adjustable range of barium titanate system ceramic materials;

[0024] Third, CZ material is synthesized and added to the system as one of the modified dopants to improve the temperature stability and reduce the dielectric loss of the ceramic material. CZ material has good temperature stability, and when added to the barium titanate system, it has the effect of stabilizing the temperature and reducing the dielectric loss; compared with adding calcium carbonate and zirconium dioxide alone, synthesizing CZ material first and then adding CZ material in the form of CZ material can make Ca and Zr elements work together, realize directional design of composition and organization, and obtain higher dielectric constant, more stable temperature characteristics and lower dielectric loss. In addition, if Ca element is added in the form of calcium carbonate, the decomposition of calcium carbonate during sintering will produce micropores and other defects in the system, which is not conducive to the reliability of the capacitor, and the addition of CZ material in the form of CZ material avoids the above problems;

[0025] Fourth, BLBS material is synthesized and added to the system as one of the modified dopants to effectively reduce the sintering temperature of the ceramic material, improve the organization density, and further improve the dielectric constant, insulation resistance and reliability of the ceramic material. The B, Li and Si elements in BLBS material have a low melting point, which produces a small amount of liquid phase during sintering to aid the system; the Ba element in BLBS material has the effect of stabilizing the system, so that the ceramic material can obtain stable performance within a wide sintering temperature range, and also reduces the adverse effects of B, Li and Si elements on the barium titanate particles;

[0026] Fifth, by the particle size combination type barium titanate matrix, and by limiting the composition of the ceramic material modification dopant, a ceramic material with high dielectric constant, high insulation resistance, high reliability is obtained. The rare earth oxide A and the rare earth oxide B are two types of rare earth elements with different ionic radii, and the two types of rare earth oxides are cooperatively doped to realize A / B site directional substitution of barium titanate, thereby improving the reduction resistance and reliability of the system; the magnesium oxide cooperates with the rare earth oxide A and the rare earth oxide B to form a "shell" layer of the barium titanate, forming a "shell-core" structure to obtain a smooth temperature characteristic curve; the addition of the trimanganese tetroxide and the vanadium pentoxide has the effect of preventing the system from being reduced, reducing the generation of oxygen vacancies during sintering, and improving the reliability. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the particle size combination type barium titanate matrix of the present application;

[0028] Figure 2 It is a sample dielectric constant change curve with temperature of Example 1;

[0029] Figure 3 It is a sample capacitance change rate change curve with temperature of Example 1;

[0030] In the figure, 1-BT1 barium titanate, 2-BT2 barium titanate, 3-modification dopant. DETAILED DESCRIPTION

[0031] The present application is further described below through specific embodiments.

[0032] A high dielectric constant and high reliability ceramic dielectric capacitor, which is prepared by using a ceramic material prepared based on a particle size combination type matrix as a dielectric material, using a nickel electrode as an inner electrode, and using a copper electrode as an outer electrode, and sequentially going through the processes of ceramic slurry preparation, casting, printing, lamination, water pressure, slicing, debinding, sintering, chamfering, end copper, and affixing to obtain the ceramic dielectric capacitor.

[0033] The ceramic material prepared based on the particle size combination type matrix is composed of the following raw materials in parts by weight: particle size combination type barium titanate matrix 100 parts, modification dopant 0.9-9.0 parts.

[0034] The particle size combination type barium titanate matrix includes the following raw materials in parts by weight: BT1 barium titanate 50-95 parts, BT2 barium titanate 5-50 parts; specifically, the particle size of the BT1 barium titanate is 250-500 nm, and the particle size of the BT2 barium titanate is ≤200 nm.

[0035] The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, and BLBS material in a weight ratio of 0.07-0.35:0.05-0.49:0.02-0.16:0.48-3.28:0.10-2.54:0.08-0.77:0.13-1.34; specifically, the BLBS material is synthesized from barium metaborate, lithium carbonate, and silicon dioxide in a molar ratio of 0.5-2.0:0.5-2.0:0.5-2.0; and the CZ material is synthesized from calcium carbonate and zirconium dioxide in a molar ratio of 0.5-2.0:0.5-2.0.

[0036] The rare earth oxide A is one or both of dysprosium oxide and holmium oxide, and the rare earth oxide B is one or both of yttrium oxide and ytterbium oxide.

[0037] The preparation method comprises the following steps:

[0038] Step one: synthesizing the CZ material by a solid-phase method: calcium carbonate and zirconium dioxide are added into a sand mill in a predetermined ratio, and are sand-milled in pure water as a medium for 2-8 hours; after drying and crushing, the mixture is calcined at 1150-1250°C; after calcination, the mixture is ground in the sand mill in pure water as a medium until the particle size is less than 200 nm; and after drying and crushing, the CZ material is obtained;

[0039] Step two: synthesizing the BLBS material by a solid-phase method: barium metaborate, lithium carbonate, and silicon dioxide are added into a sand mill in a predetermined ratio, and are sand-milled in pure water as a medium for 2-8 hours; after drying and crushing, the mixture is calcined at 500-700°C; after calcination, the mixture is ground in the sand mill in pure water as a medium until the particle size is less than 200 nm; and after drying and crushing, the BLBS material is obtained;

[0040] Step three: grinding the modified dopant: magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, and BLBS material are added into a sand mill in a predetermined ratio, and are ground in pure water as a medium until the particle size is less than 200 nm, to obtain a modified dopant slurry;

[0041] Step four: preparing the particle-size-combined matrix high-dielectric-constant high-reliability ceramic material: BT1 barium titanate and BT2 barium titanate are added into the modified dopant slurry in step three, and are sand-milled for 2-8 hours; after drying and crushing, the ceramic material is obtained.

[0042] Example 1

[0043] A high-dielectric-constant high-reliability ceramic dielectric capacitor, which is prepared by using the ceramic material prepared by the particle-size-combined matrix as a dielectric material, using a nickel electrode as an inner electrode, and using a copper electrode as an outer electrode, and sequentially undergoing the processes of ceramic slurry preparation, casting, printing, lamination, water pressure, slicing, degreasing, sintering, chamfering, end coppering, and affixing.

[0044] The ceramic material prepared based on the particle size combination type base is composed of the following raw materials in parts by weight: particle size combination type barium titanate base 100 parts, modified dopant 4.847 parts.

[0045] The particle size combination type barium titanate base comprises the following raw materials in parts by weight: BT1 barium titanate 80 parts, BT2 barium titanate 20 parts; specifically, the particle size of BT1 barium titanate is 300 nm, and the particle size of BT2 barium titanate is 200 nm.

[0046] The modified dopant is composed of magnesium oxide, trimanganese tetroxide, divanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, and BLBS material in a weight ratio of 0.207:0.294:0.078:1.944:1.690:0.231:0.402; specifically, the BLBS material is synthesized from barium metaborate, lithium carbonate, and silicon dioxide in a molar ratio of 1.0:1.0:1.0; the CZ material is synthesized from calcium carbonate and zirconium dioxide in a molar ratio of 1.0:1.0.

[0047] The rare earth oxide A is holmium oxide, and the rare earth oxide B is ytterbium oxide.

[0048] The preparation method comprises the following steps:

[0049] Step one, synthesis of CZ material by solid phase method: calcium carbonate and zirconium dioxide are added to a sand mill in a predetermined ratio, and are sand milled for 6 hours with pure water as the medium, then are dried and crushed, and are calcined at 1200°C, and are ground in a sand mill with pure water as the medium to a particle size of less than 200 nm after calcination, and are dried and crushed to obtain the CZ material;

[0050] Step two, synthesis of BLBS material by solid phase method: barium metaborate, lithium carbonate, and silicon dioxide are added to a sand mill in a predetermined ratio, and are sand milled for 6 hours with pure water as the medium, then are dried and crushed, and are calcined at 550°C, and are ground in a sand mill with pure water as the medium to a particle size of less than 200 nm after calcination, and are dried and crushed to obtain the BLBS material;

[0051] Step three, grinding of the modified dopant: magnesium oxide, trimanganese tetroxide, divanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, and BLBS material are added to a sand mill in a predetermined ratio, and are ground with pure water as the medium to a particle size of less than 200 nm to obtain a modified dopant slurry;

[0052] Step four, preparation of the particle size combination type base high dielectric constant high reliability ceramic material: BT1 barium titanate and BT2 barium titanate are added to the modified dopant slurry in step three, and are sand milled for 3 hours, and are dried and crushed to obtain the ceramic material.

[0053] Example 2

[0054] The high dielectric constant high reliability porcelain dielectric capacitor is prepared from a ceramic material prepared from a particle size combination type base as a dielectric material, a nickel electrode as an inner electrode and a copper electrode as an outer electrode, and sequentially undergoes porcelain slurry preparation, casting, printing, lamination, water pressure, slicing, degreasing, sintering, chamfering, end copper and sintering processes to obtain the porcelain dielectric capacitor.

[0055] The ceramic material prepared from the particle size combination type base is composed of the following raw materials in parts by weight: 100 parts of a particle size combination type barium titanate base, 4.847 parts of a modified dopant.

[0056] The particle size combination type barium titanate base comprises the following raw materials in parts by weight: 60 parts of BT1 barium titanate, 40 parts of BT2 barium titanate; specifically, the particle size of the BT1 barium titanate is 300 nm, and the particle size of the BT2 barium titanate is 200 nm.

[0057] The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material and BLBS material in a weight ratio of 0.207:0.294:0.078:1.944:1.690:0.231:0.402; specifically, the BLBS material is synthesized from barium metaborate, lithium carbonate and silicon dioxide in a molar ratio of 1.0:1.0:1.0; and the CZ material is synthesized from calcium carbonate and zirconium dioxide in a molar ratio of 1.0:1.0.

[0058] The rare earth oxide A is holmium oxide, and the rare earth oxide B is ytterbium oxide.

[0059] The preparation method comprises the following steps:

[0060] Step one, synthesis of CZ material by solid phase method: calcium carbonate and zirconium dioxide are added into a sand mill in a predetermined ratio, and are sand milled for 6 hours with pure water as a medium, and then are dried and crushed, and are calcined at 1200 DEG C, and are ground in a sand mill with pure water as a medium to a particle size of less than 200 nm after calcination, and then are dried and crushed to obtain the CZ material;

[0061] Step two, synthesis of BLBS material by solid phase method: barium metaborate, lithium carbonate and silicon dioxide are added into a sand mill in a predetermined ratio, and are sand milled for 6 hours with pure water as a medium, and then are dried and crushed, and are calcined at 550 DEG C, and are ground in a sand mill with pure water as a medium to a particle size of less than 200 nm after calcination, and then are dried and crushed to obtain the BLBS material;

[0062] Step three, modification of dopant: magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material and BLBS material are added into a sand mill in a predetermined ratio, and are ground with pure water as a medium to a particle size of less than 200 nm to obtain a modified dopant slurry;

[0063] Step four, preparation of the ceramic material with high dielectric constant and high reliability: add BT1 barium titanate and BT2 barium titanate to the modified dopant slurry in step three, sand mill for 3h, and then obtain the ceramic material after drying and crushing.

[0064] Example 3

[0065] A high dielectric constant and high reliability ceramic dielectric capacitor, which is prepared by using the ceramic material with high dielectric constant and high reliability prepared by the particle size combination type base as the dielectric material, using nickel electrode as the inner electrode, and using copper electrode as the outer electrode, and sequentially going through the ceramic slurry preparation, casting, printing, lamination, water pressure, slicing, degreasing, sintering, chamfering, end copper, and affixing processes to obtain the ceramic dielectric capacitor.

[0066] The ceramic material prepared based on the particle size combination type base is composed of the following raw materials by weight: 100 parts of the particle size combination type barium titanate base and 4.847 parts of the modified dopant.

[0067] The particle size combination type barium titanate base includes the following raw materials by weight: 80 parts of BT1 barium titanate and 20 parts of BT2 barium titanate; specifically, the particle size of BT1 barium titanate is 300 nm, and the particle size of BT2 barium titanate is 100 nm.

[0068] The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, and BLBS material in a weight ratio of 0.207:0.294:0.078:1.944:1.690:0.231:0.402; specifically, the BLBS material is synthesized from barium metaborate, lithium carbonate, and silicon dioxide in a molar ratio of 1.0:1.0:1.0; and the CZ material is synthesized from calcium carbonate and zirconium dioxide in a molar ratio of 1.0:1.0.

[0069] The rare earth oxide A is holmium oxide, and the rare earth oxide B is ytterbium oxide.

[0070] The preparation method thereof includes the following steps:

[0071] Step one, synthesis of CZ material by solid phase method: add calcium carbonate and zirconium dioxide in a certain ratio into a sand mill, sand mill for 6h with pure water as the medium, dry and crush after calcination at 1200℃, grind in the sand mill with pure water as the medium to a particle size less than 200nm after calcination, and then obtain the CZ material after drying and crushing;

[0072] Step two, synthesis of BLBS material by solid phase method: add barium metaborate, lithium carbonate, and silicon dioxide in a certain ratio into a sand mill, sand mill for 6h with pure water as the medium, dry and crush after calcination at 550℃, grind in the sand mill with pure water as the medium to a particle size less than 200nm after calcination, and then obtain the BLBS material after drying and crushing;

[0073] Step three, modified dopant grinding: magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, BLBS material are added into the sand mill according to the proportion, and are ground in pure water medium to a particle size of less than 200 nm to obtain a modified dopant slurry;

[0074] Step four, preparation of particle size combined type substrate high dielectric constant high reliability ceramic material: BT1 barium titanate, BT2 barium titanate are added into the modified dopant slurry in step three, sand grinding for 3h, drying and crushing to obtain the ceramic material.

[0075] Comparative example 1

[0076] A high dielectric constant high reliability ceramic capacitor, the ceramic material prepared by the particle size combined type substrate is used as the dielectric material, the nickel electrode is used as the inner electrode, and the copper electrode is used as the outer electrode. The ceramic capacitor is obtained by the processes of ceramic slurry preparation, casting, printing, lamination, water pressure, slicing, debinding, sintering, chamfering, end copper, and burning.

[0077] The ceramic material prepared based on the particle size combined type substrate is composed of the following raw materials by weight: particle size combined type barium titanate substrate 100 parts, modified dopant 4.847 parts.

[0078] The particle size combined type barium titanate substrate includes the following raw materials by weight: BT1 barium titanate 100 parts; specifically, the particle size of BT1 barium titanate is 300 nm.

[0079] The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, and BLBS material in a weight ratio of 0.207:0.294:0.078:1.944:1.690:0.231:0.402; specifically, the BLBS material is synthesized from barium metaborate, lithium carbonate, and silicon dioxide in a molar ratio of 1.0:1.0:1.0; the CZ material is synthesized from calcium carbonate and zirconium dioxide in a molar ratio of 1.0:1.0.

[0080] The rare earth oxide A is holmium oxide, and the rare earth oxide B is ytterbium oxide.

[0081] The preparation method comprises the following steps:

[0082] Step one, synthesis of CZ material by solid phase method: calcium carbonate and zirconium dioxide are added into the sand mill according to the proportion, and are sand ground in pure water medium for 6h, dried and crushed, then calcined at 1200℃, and then ground in pure water medium in the sand mill to a particle size of less than 200 nm, and dried and crushed to obtain the CZ material;

[0083] Step two, synthesis of BLBS material by solid phase method: barium metaborate, lithium carbonate, and silicon dioxide are added into a sand mill in a certain ratio, and are sand milled for 6 hours with pure water as medium. After drying and crushing, the mixture is calcined at 550 DEG C, and then is ground in the sand mill with pure water as medium until the particle size is less than 200 nm. After drying and crushing, the BLBS material is obtained;

[0084] Step three, grinding of modified dopant: magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, and BLBS material are added into a sand mill in a certain ratio, and are ground with pure water as medium until the particle size is less than 200 nm, to obtain a modified dopant slurry;

[0085] Step four, preparation of particle size combination type matrix high dielectric constant and high reliability ceramic material: BT1 barium titanate and BT2 barium titanate are added into the modified dopant slurry in step three, and are sand milled for 3 hours. After drying and crushing, the ceramic material is obtained.

[0086] Comparative example 2

[0087] A high dielectric constant and high reliability ceramic dielectric capacitor, which is prepared by using the particle size combination type matrix ceramic material as dielectric material, using nickel electrode as inner electrode, and using copper electrode as outer electrode, and sequentially undergoing ceramic slurry preparation, casting, printing, lamination, water pressure, slicing, degreasing, sintering, chamfering, end copper, and burning process.

[0088] The particle size combination type matrix ceramic material is composed of the following raw materials by weight: particle size combination type barium titanate matrix 100 parts, and modified dopant 4.847 parts.

[0089] The particle size combination type barium titanate matrix comprises the following raw materials by weight: BT2 barium titanate 100 parts; specifically, the particle size of the BT2 barium titanate is 200 nm.

[0090] The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, and BLBS material in a weight ratio of 0.207:0.294:0.078:1.944:1.690:0.231:0.402; specifically, the BLBS material is synthesized from barium metaborate, lithium carbonate, and silicon dioxide in a molar ratio of 1.0:1.0:1.0; and the CZ material is synthesized from calcium carbonate and zirconium dioxide in a molar ratio of 1.0:1.0.

[0091] The rare earth oxide A is holmium oxide, and the rare earth oxide B is ytterbium oxide.

[0092] The preparation method comprises the following steps:

[0093] Step one, synthesis of CZ material by solid phase method: calcium carbonate, zirconium dioxide are added into a sand mill according to the ratio, and are sand milled for 6h with pure water as medium, dried and crushed, then calcined at 1200℃, ground in the sand mill with pure water as medium to a particle size of less than 200nm, dried and crushed to obtain the CZ material;

[0094] Step two, synthesis of BLBS material by solid phase method: barium metaborate, lithium carbonate, silicon dioxide are added into a sand mill according to the ratio, and are sand milled for 6h with pure water as medium, dried and crushed, then calcined at 550℃, ground in the sand mill with pure water as medium to a particle size of less than 200nm, dried and crushed to obtain the BLBS material;

[0095] Step three, modification of dopant grinding: magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, BLBS material are added into a sand mill according to the ratio, and are ground with pure water as medium to a particle size of less than 200nm to obtain a modified dopant slurry;

[0096] Step four, preparation of particle size combination type matrix high dielectric constant and high reliability ceramic material: BT1 barium titanate, BT2 barium titanate are added into the modified dopant slurry in step three, sand milled for 3h, dried and crushed to obtain the ceramic material.

[0097] Comparative example 3

[0098] A high dielectric constant and high reliability ceramic dielectric capacitor, the ceramic material prepared based on the particle size combination type matrix is used as the dielectric material, the nickel electrode is used as the inner electrode, and the copper electrode is used as the outer electrode, which successively undergoes the processes of ceramic slurry preparation, casting, printing, lamination, water pressure, slicing, degreasing, sintering, chamfering, end copper, and burning to obtain the ceramic dielectric capacitor.

[0099] The ceramic material prepared based on the particle size combination type matrix is composed of the following raw materials by weight: particle size combination type barium titanate matrix 100 parts, modified dopant 4.847 parts.

[0100] The particle size combination type barium titanate matrix includes the following raw materials by weight: BT1 barium titanate 80 parts, BT2 barium titanate 20 parts; specifically, the particle size of BT1 barium titanate is 300nm, and the particle size of BT2 barium titanate is 200nm.

[0101] The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, calcium carbonate, zirconium dioxide, and BLBS material in a weight ratio of 0.207:0.294:0.078:1.944:1.690:0.129:0.158:0.402; specifically, the BLBS material is synthesized from barium metaborate, lithium carbonate, and silicon dioxide in a molar ratio of 1.0:1.0:1.0.

[0102] The rare earth oxide A is holmium oxide, and the rare earth oxide B is ytterbium oxide.

[0103] A preparation method thereof comprises the following steps:

[0104] Step one, synthesizing the BLBS material by a solid phase method: adding barium metaborate, lithium carbonate and silicon dioxide into a sand mill according to a proportion, and sand milling for 6 hours with pure water as a medium; drying and crushing, and then calcining at 550 DEG C; grinding in the sand mill with pure water as a medium to a particle size of less than 200 nm after calcining; drying and crushing to obtain the BLBS material;

[0105] Step two, grinding the modified dopant: adding magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, calcium carbonate, zirconium dioxide and the BLBS material into a sand mill according to a proportion, and grinding to a particle size of less than 200 nm with pure water as a medium to obtain a modified dopant slurry;

[0106] Step three, preparing the particle size combination type matrix high dielectric constant and high reliability ceramic material: adding BT1 barium titanate and BT2 barium titanate into the modified dopant slurry in step three, sand milling for 3 hours, drying and crushing to obtain the ceramic material.

[0107] Comparative example 4

[0108] A high dielectric constant and high reliability ceramic dielectric capacitor, which is prepared from a ceramic material prepared from a particle size combination type matrix as a dielectric material, a nickel electrode as an inner electrode and a copper electrode as an outer electrode, and sequentially undergoes the processes of ceramic slurry preparation, casting, printing, lamination, water pressure, slicing, degreasing, sintering, chamfering, end copper and sintering.

[0109] The ceramic material prepared from the particle size combination type matrix is composed of the following raw materials in parts by weight: a particle size combination type barium titanate matrix 100 parts and a modified dopant 4.847 parts.

[0110] The particle size combination type barium titanate matrix comprises the following raw materials in parts by weight: BT1 barium titanate 80 parts and BT2 barium titanate 20 parts; specifically, the particle size of the BT1 barium titanate is 300 nm, and the particle size of the BT2 barium titanate is 200 nm.

[0111] The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material and silicon dioxide in a proportion of 0.207:0.294:0.078:1.944:1.690:0.231:0.077 by weight; specifically, the CZ material is synthesized from calcium carbonate and zirconium dioxide in a molar ratio of 1.0:1.0.

[0112] The rare earth oxide A is holmium oxide, and the rare earth oxide B is ytterbium oxide.

[0113] a preparation method thereof, comprising the following steps:

[0114] Step one, solid phase synthesis of CZ material: calcium carbonate, zirconium dioxide are added into a sand mill according to the ratio, and are sand milled for 6h with pure water as medium, and then are dried and crushed, and then are calcined at 1200℃, and then are ground in the sand mill with pure water as medium to a particle size of less than 200nm, and then are dried and crushed to obtain the CZ material;

[0115] Step two, modification of dopant grinding: magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, silicon dioxide are added into a sand mill according to the ratio, and are ground to a particle size of less than 200nm with pure water as medium to obtain a modified dopant slurry;

[0116] Step three, preparation of particle size combination type matrix high dielectric constant and high reliability ceramic material: BT1 barium titanate and BT2 barium titanate are added into the modified dopant slurry in step three, and are sand milled for 3h, and then are dried and crushed to obtain the ceramic material.

[0117] Comparative example 5

[0118] A high dielectric constant and high reliability ceramic dielectric capacitor, which is prepared by using the ceramic material prepared by the particle size combination type matrix as the dielectric material, using nickel electrode as the inner electrode and copper electrode as the outer electrode, and sequentially going through the processes of ceramic slurry preparation, casting, printing, lamination, water pressure, slicing, degreasing, sintering, chamfering, end copper, and burning.

[0119] The ceramic material prepared based on the particle size combination type matrix is composed of the following raw materials in parts by weight: particle size combination type barium titanate matrix 100 parts, modified dopant 4.847 parts.

[0120] The particle size combination type barium titanate matrix comprises the following raw materials in parts by weight: BT1 barium titanate 80 parts, BT2 barium titanate 20 parts; specifically, the particle size of BT1 barium titanate is 300nm, and the particle size of BT2 barium titanate is 200nm.

[0121] The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, barium metaborate, lithium carbonate, and silicon dioxide in a ratio of 0.207:0.294:0.078:1.944:1.690:0.231:0.251:0.083:0.068 by weight; specifically, the CZ material is synthesized from calcium carbonate and zirconium dioxide in a molar ratio of 1.0:1.0.

[0122] The rare earth oxide A is holmium oxide, and the rare earth oxide B is ytterbium oxide.

[0123] a preparation method thereof, comprising the following steps:

[0124] Step one, solid phase synthesis of CZ material: calcium carbonate, zirconium dioxide are added into the sand mill according to the ratio, and are sand milled for 6h with pure water as medium, and are dried and crushed, and then are calcined at 1200℃, and then are ground in the sand mill with pure water as medium to a particle size of less than 200nm, and then are dried and crushed to obtain the CZ material;

[0125] Step two, modification of dopant grinding: magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, barium metaborate, lithium carbonate, silicon dioxide are added into the sand mill according to the ratio, and are ground to a particle size of less than 200nm with pure water as medium to obtain a modified dopant slurry;

[0126] Step three, preparation of particle size combination type matrix high dielectric constant and high reliability ceramic material: BT1 barium titanate and BT2 barium titanate are added into the modified dopant slurry in step three, and are sand milled for 3h, and then are dried and crushed to obtain the ceramic material.

[0127] Comparative example 6

[0128] A high dielectric constant and high reliability ceramic dielectric capacitor, which is prepared by using the ceramic material prepared based on the particle size combination type matrix as the dielectric material, using nickel electrode as the inner electrode and copper electrode as the outer electrode, and sequentially going through the steps of ceramic slurry preparation, casting, printing, lamination, water pressure, slicing, degreasing, sintering, chamfering, end copper, and burning.

[0129] The ceramic material prepared based on the particle size combination type matrix is composed of the following raw materials by weight: particle size combination type barium titanate matrix 100 parts, modified dopant 4.847 parts.

[0130] The particle size combination type barium titanate matrix includes the following raw materials by weight: BT1 barium titanate 80 parts, BT2 barium titanate 20 parts; specifically, the particle size of BT1 barium titanate is 300nm, and the particle size of BT2 barium titanate is 200nm.

[0131] The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, and BLBS material in a weight ratio of 0.207:0.294:0.078:1.944:1.690:0.231:0.402; specifically, the BLBS material is synthesized from boron oxide, lithium carbonate, and silicon dioxide in a molar ratio of 1.0:1.0:1.0; and the CZ material is synthesized from calcium carbonate and zirconium dioxide in a molar ratio of 1.0:1.0.

[0132] The rare earth oxide A is holmium oxide, and the rare earth oxide B is ytterbium oxide.

[0133] The preparation method thereof includes the following steps:

[0134] Step one, synthesis of CZ material by solid phase method: calcium carbonate and zirconium dioxide are added into a sand mill in a certain ratio, and are sand milled for 6h with pure water as medium, and then are dried and crushed, and then are calcined at 1200℃, and then are ground in the sand mill with pure water as medium until the particle size is less than 200nm, and then are dried and crushed to obtain the CZ material;

[0135] Step two, synthesis of BLBS material by solid phase method: boron oxide, lithium carbonate and silicon dioxide are added into a sand mill in a certain ratio, and are sand milled for 6h with pure water as medium, and then are dried and crushed, and then are calcined at 550℃, and then are ground in the sand mill with pure water as medium until the particle size is less than 200nm, and then are dried and crushed to obtain the BLBS material;

[0136] Step three, grinding of modified dopant: magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material and BLBS material are added into a sand mill in a certain ratio, and are ground with pure water as medium until the particle size is less than 200nm to obtain a modified dopant slurry;

[0137] Step four, preparation of particle size combination type matrix high dielectric constant and high reliability ceramic material: BT1 barium titanate and BT2 barium titanate are added into the modified dopant slurry in step three, and are sand milled for 3h, and then are dried and crushed to obtain the ceramic material.

[0138] Comparative example 7

[0139] A high dielectric constant and high reliability ceramic dielectric capacitor, which is prepared by using the ceramic material prepared based on the particle size combination type matrix as the dielectric material, using nickel electrode as the inner electrode and copper electrode as the outer electrode, and sequentially going through the processes of ceramic slurry preparation, casting, printing, lamination, water pressure, slicing, degreasing, sintering, chamfering, end copper and burning.

[0140] The ceramic material prepared based on the particle size combination type matrix is composed of the following raw materials in weight parts: particle size combination type barium titanate matrix 100 parts and modified dopant 4.847 parts.

[0141] The particle size combination type barium titanate matrix comprises the following raw materials in weight parts: BT1 barium titanate 80 parts and BT2 barium titanate 20 parts; specifically, the particle size of BT1 barium titanate is 300nm, and the particle size of BT2 barium titanate is 200nm.

[0142] The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material and BLBS material in a weight ratio of 0.207:0.294:0.078:1.944:1.690:0.231:0.402; specifically, the BLBS material is synthesized from boric acid, lithium carbonate and silicon dioxide in a molar ratio of 1.0:1.0:1.0; and the CZ material is synthesized from calcium carbonate and zirconium dioxide in a molar ratio of 1.0:1.0.

[0143] The rare earth oxide A is holmium oxide, and the rare earth oxide B is ytterbium oxide.

[0144] A preparation method thereof comprises the following steps:

[0145] Step one, synthesizing the CZ material by a solid phase method: calcium carbonate, zirconium dioxide are added into a sand mill according to a proportion, and are sand milled for 6 hours with pure water as a medium, and are dried and crushed, and then are calcined at 1200 DEG C, and then are ground in the sand mill with pure water as a medium until the particle size is less than 200 nm, and then are dried and crushed to obtain the CZ material;

[0146] Step two, synthesizing the BLBS material by a solid phase method: boric acid, lithium carbonate and silicon dioxide are added into a sand mill according to a proportion, and are sand milled for 6 hours with pure water as a medium, and are dried and crushed, and then are calcined at 550 DEG C, and then are ground in the sand mill with pure water as a medium until the particle size is less than 200 nm, and then are dried and crushed to obtain the BLBS material;

[0147] Step three, grinding the modified dopant: magnesium oxide, trimanganese tetroxide, vanadium pentoxide, the rare earth oxide A, the rare earth oxide B, the CZ material and the BLBS material are added into a sand mill according to a proportion, and are ground with pure water as a medium until the particle size is less than 200 nm to obtain a modified dopant slurry;

[0148] Step four, preparing the particle size combination type matrix high dielectric constant and high reliability ceramic material: BT1 barium titanate and BT2 barium titanate are added into the modified dopant slurry in step three, and are sand milled for 3 hours, and then are dried and crushed to obtain the ceramic material.

[0149] Comparative example 8

[0150] A high dielectric constant and high reliability ceramic dielectric capacitor, which is prepared from the ceramic material prepared from the particle size combination type matrix as a dielectric material, nickel as an inner electrode and copper as an outer electrode, and sequentially undergoes the processes of ceramic slurry preparation, casting, printing, lamination, water pressure, slicing, degreasing, sintering, chamfering, end copper and sintering.

[0151] The ceramic material prepared from the particle size combination type matrix is composed of the following raw materials in parts by weight: 100 parts of the particle size combination type barium titanate matrix and 4.847 parts of the modified dopant.

[0152] The particle size combination type barium titanate matrix is composed of the following raw materials in parts by weight: 80 parts of BT1 barium titanate and 20 parts of BT2 barium titanate; specifically, the particle size of the BT1 barium titanate is 300 nm, and the particle size of the BT2 barium titanate is 200 nm.

[0153] The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B and BLBS material in a weight ratio of 0.207:0.294:0.078:1.944:1.690:0.402; specifically, the BLBS material is synthesized from barium metaborate, lithium carbonate and silicon dioxide in a molar ratio of 1.0:1.0:1.0.

[0154] The rare earth oxide A is holmium oxide, and the rare earth oxide B is ytterbium oxide.

[0155] The preparation method comprises the following steps:

[0156] Step one: synthesizing the BLBS material by a solid phase method: barium metaborate, lithium carbonate and silicon dioxide are added into a sand mill in a predetermined ratio, and are sand milled for 6 hours in pure water as a medium, and then are dried and crushed, and are calcined at 550 DEG C, and then are ground in the sand mill in pure water as a medium to a particle size of less than 200 nm, and then are dried and crushed to obtain the BLBS material;

[0157] Step two: grinding the modified dopant: magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B and BLBS material are added into a sand mill in a predetermined ratio, and are ground in pure water as a medium to a particle size of less than 200 nm to obtain a modified dopant slurry;

[0158] Step three: preparing the particle size combination type base high dielectric constant and high reliability ceramic material: BT1 barium titanate and BT2 barium titanate are added into the modified dopant slurry in step three, and are sand milled for 3 hours, and then are dried and crushed to obtain the ceramic material.

[0159] Comparative example 9

[0160] A high dielectric constant and high reliability ceramic dielectric capacitor, which is prepared from the ceramic material prepared based on the particle size combination type base as a dielectric material, nickel as an inner electrode and copper as an outer electrode, and sequentially undergoes the processes of ceramic slurry preparation, casting, printing, lamination, water pressure, slicing, degreasing, sintering, chamfering, end copper and sintering.

[0161] The ceramic material prepared based on the particle size combination type base is composed of the following raw materials in weight parts: 100 parts of the particle size combination type barium titanate base and 4.847 parts of the modified dopant.

[0162] The particle size combination type barium titanate base comprises the following raw materials in weight parts: 80 parts of BT1 barium titanate and 20 parts of BT2 barium titanate; specifically, the particle size of the BT1 barium titanate is 300 nm, and the particle size of the BT2 barium titanate is 200 nm.

[0163] The modified dopant is composed of magnesium oxide, manganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, and CZ material in a weight ratio of 0.207:0.294:0.078:1.944:1.690:0.231; specifically, the CZ material is synthesized from calcium carbonate and zirconium dioxide in a molar ratio of 1.0:1.0.

[0164] Rare earth oxide A is holmium oxide, and rare earth oxide B is ytterbium oxide.

[0165] Its preparation method includes the following steps:

[0166] Step 1, solid-state synthesis of CZ material: Calcium carbonate and zirconium dioxide are added to a sand mill according to the ratio and sand milled for 6 hours with pure water as the medium. After drying and pulverizing, the material is calcined at 1200℃. After calcination, the material is ground in a sand mill with pure water as the medium until the particle size is less than 200nm. After drying and pulverizing, the CZ material is obtained.

[0167] Step 2, grinding of modified dopant: Magnesium oxide, manganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, and CZ materials are added to a sand mill according to the ratio and ground with pure water as the medium until the particle size is less than 200nm to obtain modified dopant slurry.

[0168] Step 3, Preparation of high dielectric constant and high reliability ceramic material with particle size combination matrix: Add BT1 barium titanate and BT2 barium titanate to the modified dopant slurry in Step 3, mill for 3 hours, dry and pulverize to obtain the ceramic material.

[0169] The capacitors prepared in Examples 1-3 and Comparative Examples 1-9 were tested, and the following data were obtained. The results are shown in the table below:

[0170] Table 1 Test results for each capacitor

[0171]

[0172]

[0173] Through the above table and appendix Figure 2 , 3 It is known that the high dielectric constant and high reliability ceramic material with a particle size combination matrix prepared in this application is obtained by combining barium titanate with different particle sizes and modifying and doping barium titanate with magnesium oxide, manganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, BLBS material, etc., resulting in high dielectric constant, stable temperature characteristic curve, high insulation resistance and good reliability.

[0174] By comparing example 1 with comparative examples 1-9, it can be seen that by combining different particle sizes of barium titanate matrix and limiting the synthesis and composition of the doping modifier, excellent properties such as high dielectric constant (≥3500), smooth dielectric temperature characteristic curve (meeting the X7R requirement), low loss (≤3.5%), high insulation resistance (RC@25℃≥3000MΩ·μF), and high reliability (MTTF@75V 125℃≥350h) can be obtained.

[0175] The above merely describes preferred embodiments of the present application, and therefore cannot limit the scope of the present application. Any equivalent changes and modifications made in accordance with the scope and content of the present application should still fall within the scope of the present application.

Claims

1. A ceramic material prepared on the basis of a combination of particle size groups, characterized by: It is composed of the following raw materials by weight: particle size combination type barium titanate base 100 parts, modified dopant 0.9-9.0 parts; The particle size combination type barium titanate base comprises the following raw materials by weight: BT1 barium titanate 50-95 parts, BT2 barium titanate 5-50 parts; The modified dopant is composed of magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, BLBS material in a weight ratio of 0.07-0.35:0.05-0.49:0.02-0.16:0.48-3.28:0.10-2.54:0.08-0.77:0.13-1.34; The BLBS material is synthesized from barium metaborate, lithium carbonate, silicon dioxide in a molar ratio of 0.5-2.0:0.5-2.0:0.5-2.0; The CZ material is synthesized from calcium carbonate, zirconium dioxide in a molar ratio of 0.5-2.0:0.5-2.

0.

2. The ceramic material based on the combination of particle sizes according to claim 1, characterized in that: The BT1 barium titanate particle size is 250nm-500nm, and the BT2 barium titanate particle size is ≤200nm.

3. The ceramic material based on the combination of particle sizes according to claim 1, characterized in that: The rare earth oxide A is one or both of dysprosium oxide and holmium oxide, and the rare earth oxide B is one or both of yttrium oxide and ytterbium oxide.

4. The method of claim 1, wherein the ceramic material is prepared based on a combination of particle sizes of the base material. It comprises the following steps: Step one, solid phase synthesis of CZ material: calcium carbonate, zirconium dioxide are added to the sand mill according to the ratio, and sand grinding is carried out for 2-8h with pure water as medium, and then calcination is carried out at 1150-1250℃ after drying and crushing, and then grinding is carried out in the sand mill with pure water as medium until the particle size is less than 200nm, and then drying and crushing are carried out to obtain the CZ material; Step two, solid phase synthesis of BLBS material: barium metaborate, lithium carbonate, silicon dioxide are added to the sand mill according to the ratio, and sand grinding is carried out for 2-8h with pure water as medium, and then calcination is carried out at 500-700℃ after drying and crushing, and then grinding is carried out in the sand mill with pure water as medium until the particle size is less than 200nm, and then drying and crushing are carried out to obtain the BLBS material; Step three, modified dopant grinding: magnesium oxide, trimanganese tetroxide, vanadium pentoxide, rare earth oxide A, rare earth oxide B, CZ material, BLBS material are added to the sand mill according to the ratio, and grinding is carried out with pure water as medium until the particle size is less than 200nm to obtain the modified dopant slurry; Step four, preparation of particle size combination type base high dielectric constant high reliability ceramic material: BT1 barium titanate and BT2 barium titanate are added to the modified dopant slurry in step three, sand grinding is carried out for 2-8h, and then drying and crushing are carried out to obtain the ceramic material.

5. A high dielectric constant high reliability porcelain capacitor, characterized by: The ceramic material is made of any one of claims 1-3.

6. The method of claim 5, wherein the method further comprises: The ceramic material of any one of claims 1-3 is used as the dielectric material, the nickel electrode is used as the inner electrode, and the copper electrode is used as the outer electrode, and the porcelain dielectric capacitor is obtained by the following processes in sequence: porcelain slurry preparation, casting, printing, lamination, water pressure, slicing, debinding, sintering, chamfering, copper end, and affixing. ​

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