CN107399970A - A kind of medium material for multilayer ceramic capacitors with superior insulation characteristics - Google Patents
A kind of medium material for multilayer ceramic capacitors with superior insulation characteristics Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 29
- 239000003985 ceramic capacitor Substances 0.000 title claims abstract description 21
- 238000009413 insulation Methods 0.000 title claims abstract description 19
- 238000000498 ball milling Methods 0.000 claims abstract description 28
- 238000001035 drying Methods 0.000 claims abstract description 16
- 229910002113 barium titanate Inorganic materials 0.000 claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 229910002976 CaZrO3 Inorganic materials 0.000 claims abstract description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910003237 Na0.5Bi0.5TiO3 Inorganic materials 0.000 claims abstract description 9
- 239000001257 hydrogen Substances 0.000 claims abstract description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 9
- 238000005245 sintering Methods 0.000 claims abstract description 9
- 238000001354 calcination Methods 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims abstract description 6
- 239000008367 deionised water Substances 0.000 claims description 13
- 229910021641 deionized water Inorganic materials 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Inorganic materials O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 229910010252 TiO3 Inorganic materials 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(III) oxide Inorganic materials O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 claims description 6
- 238000003786 synthesis reaction Methods 0.000 claims description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 239000011656 manganese carbonate Substances 0.000 claims description 4
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 2
- 238000007873 sieving Methods 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000003989 dielectric material Substances 0.000 description 4
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- MTZOKGSUOABQEO-UHFFFAOYSA-L barium(2+);phthalate Chemical compound [Ba+2].[O-]C(=O)C1=CC=CC=C1C([O-])=O MTZOKGSUOABQEO-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010344 co-firing Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003574 free electron Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
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- H01G4/06—Solid dielectrics
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- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
- H01G4/1218—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates
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Abstract
The invention discloses a kind of medium material for multilayer ceramic capacitors with superior insulation characteristics, with BaTiO3Powder is base-material, and additional mass percent is 0.3~0.8% Na0.5Bi0.5TiO3；0~1.5% (NiO)1‑x(NbO2.5)x, wherein x=0.6~0.8；0~0.5% (MnO)1‑y(NbO2.5)y, wherein y=0.4~0.6；1.0~3.0% CaZrO3.First with BaTiO3As base-material, additional Na0.5Bi0.5TiO3, BT NBT mixtures are made after calcining；It is additional in BT NBT (NiO) again1‑x(NbO2.5)x、(MnO)1‑y(NbO2.5)yAnd CaZrO3, it is granulated after ball milling, drying, sieving, is pressed into green compact, green compact 1300~1320 DEG C of sintering in nitrogen and hydrogen mixture atmosphere, medium material for multilayer ceramic capacitors is made.The present invention is in 55 DEG C~150 DEG C warm areas, and rate of change of capacitance is less than ± 15%, and dielectric constant height (~41729), dielectric loss is relatively low (~0.026), and resistivity is more than 1011Ω·cm。
Description
Technical field
The invention belongs to a kind of ceramic composition characterized by composition, and in particular to one kind have superior insulation characteristics and
X8R type medium material for multilayer ceramic capacitors with huge dielectric constant and temperature stability and preparation method thereof
Background technology
Electronics based on chip multilayer ceramic capacitor (Multilayer Ceramic Capacitor, abbreviation MLCC)
Component, application field are quite extensive.Barium titanate (BaTiO3) base temperature-stable MLCC dielectric materials because its to environment without
Evil, it is always the focus of research,
Huge dielectric constant (ε>104) High-temperature stabilization low loss dielectric material be make high-performance energy storage device ideal
Material, it can be applicable to the fields such as high Jie MLCC, solid-state super capacitor.BaTiO3Sinter under reducing atmosphere, it may appear that partly lead
Change and produce more free electron, polarization caused by Spectrametry of Electron Exchange movement can significantly improve dielectric constant, show huge Jie's property
Energy.However, BaTiO3Semiconductor transformation will also result in insulation resistivity decline, turn into semiconductor, lose insulating properties.Therefore,
How to ensure huge Jie's performance and corresponding insulation characterisitic, turn into the key issue of research.
With the increase of MLCC demands, MLCC develops towards high capacity, the increase of its interior media number of plies, correspondingly,
Inner electrode layer number is consequently increased, and MLCC manufacturing costs improve constantly.Use nickel metal as interior electrode cost for silver-colored palladium electrode
1/20th, considerably reduce cost.With nickel electrode matching co-firing, it need to ensure that barium titanate is still kept under reducing atmosphere
Certain insulation characterisitic.
The content of the invention
The purpose of the present invention, while being to ensure that huge Jie's characteristic occurs in barium phthalate base dielectric material under reducing atmosphere, solution
The problem of certainly insulation resistivity declines.Present in solution huge dielectric constant dielectric material between dielectric loss and stability not
Matching problem.Meanwhile avoid producing or synthesize leaded in component, endanger environment.There is provided a kind of with superior isolation characteristic
Huge dielectric constant and the lead-free X 8 R type medium material for multilayer ceramic capacitors of excellent temperature stability and preparation method thereof.
The present invention is achieved by following technical solution.
A kind of medium material for multilayer ceramic capacitors with superior insulation characteristics, with BaTiO3Powder is base-material, herein
On the basis of, additional mass percent is 0.3~0.8% Na0.5Bi0.5TiO3；0~1.5% (NiO)1-x(NbO2.5)x, wherein
X=0.6~0.8；0~0.5% (MnO)1-y(NbO2.5)y, wherein y=0.4~0.6；1.0~3.0% CaZrO3；
Described Na0.5Bi0.5TiO3, it is by Na2CO3、Bi2O3And TiO2It is 1 by mole ratio:1:4 synthesis；
(NiO)1-x(NbO2.5)xCompound, it is by NiO and Nb2O51-x in molar ratio：X/2, wherein x=0.6~
0.8 synthesis；
(MnO)1-y(NbO2.5)yCompound, it is by MnCO3、Nb2O51-y in molar ratio：Y/2, wherein y=0.4~
0.6 synthesis；
The CaZrO3By CaCO3And ZrO21: 1 synthesis in molar ratio；
The preparation method of the medium material for multilayer ceramic capacitors, there are following steps：
(1) Na is synthesized0.5Bi0.5TiO3
By Na2CO3、Bi2O3And TiO2It is 1 by mole ratio:1:4 carry out dispensing, and mixing and ball milling dries after 4 hours, crosses 40
Mesh sub-sieve, calcined 4 hours in 950 DEG C, Na is made0.5Bi0.5TiO3；
(2) (NiO) is synthesized1-x(NbO2.5)xCompound, wherein x=0.6~0.8
By NiO, Nb2O51-x in molar ratio：The dispensing of x/2, wherein x=0.6~0.8, ball after raw material mixes with deionized water
Mill 4 hours, in 120 DEG C of drying, 40 mesh sub-sieves are crossed, are calcined 2 hours in 1000 DEG C, then secondary ball milling 6 hours, drying, cross 80
Mesh sub-sieve, it is made (NiO)1-x(NbO2.5)x, wherein x=0.6~0.8；
(3) (MnO) is synthesized1-y(NbO2.5)yCompound, wherein y=0.4~0.6
By MnCO3、Nb2O51-y in molar ratio：The dispensing of y/2, wherein y=0.4~0.6, after raw material mixes with deionized water
Ball milling 4 hours, in 120 DEG C of drying, 40 mesh sub-sieves are crossed, in 800~1000 DEG C of calcinings, then secondary ball milling 6 hours, drying, mistake
80 mesh sub-sieves, it is made (MnO)1-y(NbO2.5)y, wherein y=0.4~0.6；
(4) CaZrO is synthesized3
By CaCO3、ZrO2In molar ratio 1:1 dispensing, ball milling 4 hours after raw material mixes with deionized water, dried in 120 DEG C,
40 mesh sub-sieves are crossed, are calcined 2 hours in 1000 DEG C, CaZrO is made3；
(5) with BaTiO3As base-material, the Na of doping mass percent 0.3~0.8%0.5Bi0.5TiO3, mixing and ball milling 4 is small
When, dry and calcined 8 hours after 1050 DEG C, BT-NBT mixtures are made；
(6) in BT-NBT additional following mass percents composition：0~1.5% (NiO)1-x(NbO2.5)x, wherein x
=0.6~0.8；0~0.5% (MnO)1-y(NbO2.5)y, wherein y=0.4~0.6；1.0~3.0% CaZrO3, match somebody with somebody original
Ball milling 4~8 hours after material mixes with deionized water, the binding agent that mass percent is 7% is added after drying, crosses 80 mesh sub-sieves
It is granulated；
(7) the granulation powder of step (6) is pressed into green compact, after dumping, in the nitrogen hydrogen of hydrogen percentages 0%~1%
1300~1320 DEG C of sintering in reducing atmosphere are mixed, gas flow rate 40-50mL/min, are incubated 3 hours, being made has superior insulation
The medium material for multilayer ceramic capacitors of characteristic.
The Na0.5Bi0.5TiO3Addition be 0.5wt%.
The green compact of the step (7) are 15 × 1~1.3mm of Ф disk green compact.
After the green compact of the step (7) are warming up to 550 DEG C in 3.5 hours in air atmosphere, 1.5h dumpings are incubated, are placed into
1320 DEG C of sintering are risen to 5 DEG C/min in atmosphere furnace, are incubated 3 hours.
The nitrogen hydrogen mixeding gas air-flow velocity being passed through in the step (7) is 50mL/min.
Beneficial effects of the present invention are as follows：
1. medium material for multilayer ceramic capacitors disclosed by the invention is by the addition of niobic acid manganese and niobic acid nickel, appropriate
Sintered under reducing atmosphere, can effectively adjust the balance between barium titanate huge dielectric constant and insulation characterisitic, be obviously improved dielectric
While constant, ensure the insulation characterisitic of material, while the material also has wide operation temperature area and relatively low dielectric loss.
2. medium material for multilayer ceramic capacitors disclosed by the invention has excellent dielectric properties：At -55 DEG C~150 DEG C
In warm area, rate of change of capacitance is less than ± 15%, and with very high room temperature dielectric constant (~41729) and compared with low-dielectric loss
(~0.026), resistivity are more than 1011Ω·cm。
Embodiment
Below with reference to specific embodiment, the present invention is described in further detail：
Embodiment 1
(1) first, the 2.6497g Na of pure level (>=99%) are analyzed with electronic balance weighing2CO3、11.6490g Bi2O3
And 7.9898gTiO2Mixed, using deionized water as ball-milling medium, ball milling is dried after 4 hours, sieved, in 950 DEG C of calcinings
Na is made0.5Bi0.5TiO3；
(2) by 2.2410g NiO and 9.3033g Nb2O5, mixing, using deionized water as ball-milling medium, ball milling 4 hours
Dry, sieve afterwards, obtained (NiO) in 1000 DEG C of calcinings0.3(NbO2.5)0.7Compound, then secondary ball milling 6 hours, cross 80 mesh and divide sample
Sieve standby；
(3) the 5.7474g MnCO of pure level (>=99%) are analyzed with electronic balance weighing again3With 6.6452g Nb2O5, mix
Close, using deionized water as ball-milling medium, ball milling is dried after 4 hours, sieved, and is obtained (MnO) in 900 DEG C of calcinings0.5
(NbO2.5)0.5Compound, then secondary ball milling 6 hours, it is standby to cross 80 mesh sub-sieves；
(4) again by 22.3291g CaCO3With 27.5114g ZrO2Mixing, using deionized water as ball-milling medium, ball milling 4
Drying, sieving, CaZrO is obtained in 1000 DEG C of calcinings after hour3；
(5) by 20g BaTiO3 and 0.10g Na0.5Bi0.5TiO3Mixing and ball milling 4 hours, drying are small in 1050 DEG C of calcinings 8
When, obtain BaTiO3-N0.5B0.5TiO3Mixture (BT-NBT).
(6) by 20g BaTiO3-N0.5B0.5TiO3、0.17g(NiO)0.3(NbO2.5)0.7、0.04g(MnO)0.5(NbO2.5)0.5
With 0.20g CaZrO3Ball milling 4 hours after being mixed with deionized water, additional mass percent is 7% paraffin after drying, crosses 80
Mesh sub-sieve is granulated.
(7) shaping and sintering：
Powder after granulation is pressed into 15 × 1.2mm of Ф disk green compact under 3MPa 3.5 hours in air atmosphere
After being warming up to 550 DEG C, 1.5h dumpings are incubated, are placed into atmosphere furnace, using flow velocity as 50ml/min, hydrogen ratio 0.1%H2
Nitrogen hydrogen mixing reducing atmosphere in 1320 DEG C of sintering are risen to 5 DEG C/min, be incubated 3 hours, be made with superior insulation characteristics
Medium material for multilayer ceramic capacitors.
Silver paste is uniformly coated in resulting product upper and lower surface, electrode is prepared through 850 DEG C of burning infiltrations, testing sample, test is made
Dielectric properties and TC characteristics.
Embodiment 1-12 specific raw material proportioning and its sintering condition refers to table 1.
Table 1
Example 2-12 different component and sintering condition is embodied in table 1, other process conditions and the phase of embodiment 1
Together.
The method of testing and detection device of the present invention is as follows：
(1) dielectric properties test (AC test signals：Frequency is 1kHz, voltage 1V)
Using the capacitance C and loss tan δ of HEWLETT PACKARD 4278A type capacitance tester test samples, and
The dielectric constant of sample is calculated, calculation formula is：
(2) TC characteristic tests
Utilize GZ-ESPEC MPC-710P types high/low temperature circulation incubator, the special survey of HM27002 type capacitor C-T/V characteristics
Examination instrument and HEWLETT PACKARD 4278A are tested.Capacitance of the sample in -55 DEG C~150 DEG C of warm area is measured, is used
Following formula calculate rate of change of capacitance：
Embodiment 1-12 detection data refer to table 2.
Table 2
The invention is not limited in above-described embodiment, the change of many details is possible, but therefore this does not run counter to this
The scope and spirit of invention.
Claims (5)
- A kind of 1. medium material for multilayer ceramic capacitors with superior insulation characteristics, with BaTiO3Powder is base-material, basic herein On, additional mass percent is 0.3~0.8% Na0.5Bi0.5TiO3；0~1.5% (NiO)1-x(NbO2.5)x, wherein x= 0.6~0.8；0~0.5% (MnO)1-y(NbO2.5)y, wherein y=0.4~0.6；1.0~3.0% CaZrO3；Described Na0.5Bi0.5TiO3, it is by Na2CO3、Bi2O3And TiO2It is 1 by mole ratio:1:4 synthesis；(NiO)1-x(NbO2.5)xCompound, it is by NiO and Nb2O51-x in molar ratio：X/2, wherein x=0.6~0.8 are closed Into；(MnO)1-y(NbO2.5)yCompound, it is by MnCO3、Nb2O51-y in molar ratio：Y/2, wherein y=0.4~0.6 are closed Into；The CaZrO3By CaCO3And ZrO21: 1 synthesis in molar ratio.The preparation method of the medium material for multilayer ceramic capacitors, there are following steps：(1) Na is synthesized0.5Bi0.5TiO3By Na2CO3、Bi2O3And TiO2It is 1 by mole ratio:1:4 carry out dispensing, and mixing and ball milling dries after 4 hours, crosses 40 mesh point Sample sieves, and is calcined 4 hours in 950 DEG C, and Na is made0.5Bi0.5TiO3；(2) (NiO) is synthesized1-x(NbO2.5)xCompound, wherein x=0.6~0.8By NiO, Nb2O51-x in molar ratio：The dispensing of x/2, wherein x=0.6~0.8, ball milling 4 is small after raw material mixes with deionized water When, in 120 DEG C of drying, 40 mesh sub-sieves are crossed, are calcined 2 hours in 1000 DEG C, then secondary ball milling 6 hours, drying, crossed 80 mesh and divide sample Sieve, it is made (NiO)1-x(NbO2.5)x, wherein x=0.6~0.8；(3) (MnO) is synthesized1-y(NbO2.5)yCompound, wherein y=0.4~0.6By MnCO3、Nb2O51-y in molar ratio：The dispensing of y/2, wherein y=0.4~0.6, ball milling 4 after raw material mixes with deionized water Hour, in 120 DEG C of drying, 40 mesh sub-sieves are crossed, in 800~1000 DEG C of calcinings, then secondary ball milling 6 hours, drying, cross 80 mesh point Sample sieves, and is made (MnO)1-y(NbO2.5)y, wherein y=0.4~0.6；(4) CaZrO is synthesized3By CaCO3、ZrO2In molar ratio 1:1 dispensing, ball milling 4 hours after raw material mixes with deionized water, in 120 DEG C of drying, cross 40 Mesh sub-sieve, calcined 2 hours in 1000 DEG C, CaZrO is made3；(5) with BaTiO3As base-material, the Na of doping mass percent 0.3~0.8%0.5Bi0.5TiO3, mixing and ball milling 4 hours, Drying is calcined 8 hours after 1050 DEG C, and BT-NBT mixtures are made；(6) in BT-NBT additional following mass percents composition：0~1.5% (NiO)1-x(NbO2.5)x, wherein x=0.6 ~0.8；0~0.5% (MnO)1-y(NbO2.5)y, wherein y=0.4~0.6；1.0~3.0% CaZrO3, match somebody with somebody raw material with Ball milling 4~8 hours after deionized water mixing, adds the binding agent that mass percent is 7% after drying, cross 80 mesh sub-sieves and make Grain；(7) the granulation powder of step (6) is pressed into green compact, after dumping, mixed in the nitrogen hydrogen of hydrogen percentages 0%~1% 1300~1320 DEG C of sintering in reducing atmosphere, gas flow rate 40-50mL/min, are incubated 3 hours, and being made has superior insulation characteristics Medium material for multilayer ceramic capacitors.
- 2. a kind of medium material for multilayer ceramic capacitors with superior insulation characteristics according to claim 1, its feature It is, the Na0.5Bi0.5TiO3Addition be 0.5wt%.
- 3. a kind of medium material for multilayer ceramic capacitors with superior insulation characteristics according to claim 1, its feature It is, the green compact of the step (7) are 15 × 1~1.3mm of Ф disk green compact.
- 4. a kind of medium material for multilayer ceramic capacitors with superior insulation characteristics according to claim 1, its feature It is, after the green compact of the step (7) are warming up to 550 DEG C in 3.5 hours in air atmosphere, are incubated 1.5h dumpings, place into gas 1320 DEG C of sintering are risen to 5 DEG C/min in atmosphere stove, are incubated 3 hours.
- 5. a kind of medium material for multilayer ceramic capacitors with superior insulation characteristics according to claim 1, its feature It is, the nitrogen hydrogen mixeding gas air-flow velocity being passed through in the step (7) is 50mL/min.
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