CN105565801A - Preparation method of high-gradient and large-discharge-current-capacity voltage-sensitive ceramics for ultra-high-voltage power transmission system - Google Patents

Preparation method of high-gradient and large-discharge-current-capacity voltage-sensitive ceramics for ultra-high-voltage power transmission system Download PDF

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CN105565801A
CN105565801A CN201510997604.2A CN201510997604A CN105565801A CN 105565801 A CN105565801 A CN 105565801A CN 201510997604 A CN201510997604 A CN 201510997604A CN 105565801 A CN105565801 A CN 105565801A
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何金良
胡军
孟鹏飞
赵洪峰
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Tsinghua University
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Abstract

A preparation method of high-gradient and large-discharge-current-capacity voltage-sensitive ceramics for an ultra-high-voltage power transmission system; preparation raw materials include zinc oxide ZnO, bismuth oxide Bi2O3, antimonous oxide Sb2O3, manganese dioxide MnO2, chromium oxide Cr2O3, cobalt oxide Co2O3, silicon dioxide SiO2, aluminum nitrate Al(NO3)3, and silver oxide Ag2O. The preparation method has the beneficial effects that under conditions that a conventional raw material mixing and grinding process is not required to be changed and a sintering process has no need of pre-sintering, and by changing the proportion and composition of the auxiliary additive materials, the purpose of better controlling various electrical parameters is achieved.

Description

A kind of high-gradient, large discharge capacity system for ultra-high voltage transmission voltage-sensitive ceramic preparation method
Technical field
The present invention relates to technical field of material chemistry, particularly a kind of preparation method of pottery.
Background technology
ZnO varistor is main raw material with ZnO, adds a small amount of Bi2O3, Sb2O3, MnO2, Cr2O3, Co2O3 and silver glass powder etc. as auxiliary ingredients, adopts ceramic sintering process to be prepared from.The advantage of the non-linear behaviour good due to it and large discharge capacity, since 19 century 70s are found, ZnO varistor is widely used in the overvoltage protection of power system lightning protection and power equipment as the core parts of power system thunder arrester.
Along with improving constantly of transmission voltage grade, be particularly extra-high voltage system, apparatus insulated problem becomes increasingly conspicuous, and improves apparatus insulated paying through the nose comprehensively.Adopt the thunder arrester that assembles of ZnO varistor of high-gradient, low residual voltage can reduce the dielectric level of system, reduce the weight and volume of power transmission and transforming equipment, improve the reliability of transmission system.
The non-linear character of ZnO varistor can be divided into three regions: small area analysis district, middle Current Zone and big current district.(<10-4A/cm2) is also called prebreakdown district in small area analysis district, in this region, crystal boundary presents high-impedance state, I-V curve shows as ohm property, larger in the ohm property rate of curve in this region, then the power dissipation characteristics in leakage current region of ZnO varistor is more stable, and pressure sensitive voltage U1mA is also higher.Middle Current Zone is nonlinear resistance district, and this zone current sharply increases and voltage increases slowly, and this region I-V characteristic is determined by ZnO crystal grain and ZnO crystal boundary joint effect, is the workspace of voltage dependent resistor.(>103A/cm2) becomes ohm property again in big current district, the resistance of this region ZnO crystal grain determines the height of residual voltage, the position that occurs at I-V characteristic plane, this region, determines the size of ZnO varistor discharge capacity simultaneously.
No matter be that ZnO grain resistance all affects I-V characteristic in middle Current Zone or big current district.Improve the voltage gradient of ZnO varistor, the resistivity of ZnO varistor must be reduced.Show according to research in the past, add the resistivity that a certain amount of donor ion can significantly improve ZnO crystal grain, thus reach the object improving voltage gradient.In the industrial production of reality, mostly adopt Al ion to add in ZnO varistor material as donor ion, but the interpolation of Al ion is often along with the increase of leakage current, cause the reduction of nonlinear factor, the aging property of ZnO varistor also become unstable simultaneously.In industrial application, also have the mode adopting ZnO and the presintering of part adjunct, make the pre-reaction of part mixing raw material, to improve potential barrier and the stability of pressure sensitive, this mode makes complex manufacturing.At present mainly through improving the degree of uniformity of crystal grain, make electric current can uniform flow whole varistor valve, thus improve the discharge capacity of ZnO varistor, but the degree of uniformity of crystal grain is comparatively large by the impact of sintering process and raw material mixed grinding technique etc., accomplishes that the homogenization of crystal grain is difficult larger.
Summary of the invention
The object of the invention is to solve the problem, devising a kind of high-gradient, large discharge capacity system for ultra-high voltage transmission voltage-sensitive ceramic preparation method.Specific design scheme is:
A kind of high-gradient, large discharge capacity system for ultra-high voltage transmission voltage-sensitive ceramic preparation method, raw materials comprises zinc oxide ZnO, bismuth oxide Bi 2o 3, antimonous oxide Sb 2o 3, Manganse Dioxide MnO 2, chromic oxide Cr 2o 3, cobalt sesquioxide Co 2o 3, silicon-dioxide SiO 2, aluminum nitrate Al (NO 3) 3, silver suboxide Ag 2o,
Preparation process comprises preparation auxiliary interpolation slurry, interpolation ZnO, interpolation aluminum ion, adds silver ions, shaping, sintering,
Described raw materials also comprises Yttrium trinitrate Y (NO 3) 3or yttrium oxide Y 2o 3in one.
The mol ratio of each raw materials is:
ZnO：Bi 2O 3：Sb 2O 3：MnO 2：Cr 2O 3：Co 2O 3：SiO 2：Al(NO 3) 3：Ag 2O：Y(NO 3) 3＝87.5～95.8:0.5-2.0:0.5-1.5:0.5-1.0:0.5-1.0:0.5-1.5:1.0-2.0:0.1-1.0:0.1-1.0：1.0-1.5。
ZnO：Bi 2O 3：Sb 2O 3：MnO 2：Cr 2O 3：Co 2O 3：SiO 2：Al(NO 3) 3：Ag 2O：Y 2O 3＝87.5～95.8:0.5-2.0:0.5-1.5:0.5-1.0:0.5-1.0:0.5-1.5:1.0-2.0:0.1-1.0:0.1-1.0：1.0-1.5。
Preparation is auxiliary to be added in slurry stage, and composition comprises Bi 2o 3, Sb 2o 3, MnO 2, Cr 2o 3, Co 2o 3, SiO 2the auxiliary preparation method adding slurry is the sand milling that adds water, and the sand milling time that adds water is 1-3h, and the water added in the sand grinding process that adds water is deionized water, add deionized water and described auxiliary interpolation slurry ratio of quality and the number of copies be deionized water 2 parts, auxiliaryly add 1 part, slurry
The Bi added 2o 3, MnO 2, Cr 2o 3, Co 2o 3, SiO 2the mol ratio of composition is: 0.5-2.0:0.5-1.5:0.5-1.0:0.5-1.0:0.5-1.5:1.0-2.0.
Described forming step is compression molding, and use the cylindrical die of hydraulic pressure tabletting machine and diameter 50mm, by the particulate material compression molding after drying-granulating, forming pressure is 150MPa, molding time 3min.
Adopt High Temperature Furnaces Heating Apparatus to sinter, adopt the heat-up rate of 100 ~ 250 DEG C/h, make High Temperature Furnaces Heating Apparatus rise to 400 DEG C, under 400 DEG C of environment, be incubated binder removal 5h, from room temperature to sintering temperature 1240 ~ 1260 DEG C, be incubated 3 ~ 4h at a sintering temperature, make ceramic sintered compact.
Add in ZnO process, the ZnO added adds Bi in slurry with auxiliary 2o 3mol ratio be 87.5 ~ 95.8:0.5-2.0, carry out mixed sand mill after adding ZnO and form slurry, mixed sand time consuming is 0.5-1h, and need to add deionized water in mixing sand grinding process, the deionized water added and the ratio of quality and the number of copies of slurry are deionized water 1 part, slurry 1-2 part.
Add in aluminum ion, silver ions, ruthenium ion step:
Add Al (NO 3) 3, Ag 2o, Y (NO 3) 3be 0.1-1.0:0.1-1.0:87.5 ~ 95.8 with the mol ratio of ZnO in slurry, continue sand milling, form powder;
Add Al (NO 3) 3, Ag 2o, Y 2o 3be 0.1-1.0:0.1-1.0:0.5 ~ 1.5:87.5 ~ 95.8 with the mol ratio of ZnO in slurry, continue sand milling, form powder.
The high-gradient obtained by technique scheme of the present invention, large discharge capacity system for ultra-high voltage transmission voltage-sensitive ceramic preparation method, its beneficial effect is:
Without the need to changing existing raw material mixed grinding technique, when sintering process also need not pre-burning, by changing the ratio of adjunct and composition, the object controlling every electric parameter can be reached well.
Can control breakdown voltage gradient and be not less than 450V/mm, 2ms square wave discharge capacity reaches more than 500J/cm3, in addition, its leakage current can be controlled at below 1A/cm2, nonlinear factor is more than 70, and residual voltage ratio controls to less than 1.5, can meet the requirement of industrial application completely.
Embodiment
A kind of high-gradient, large discharge capacity system for ultra-high voltage transmission voltage-sensitive ceramic preparation method, raw materials comprises zinc oxide ZnO, bismuth oxide Bi 2o 3, antimonous oxide Sb 2o 3, Manganse Dioxide MnO 2, chromic oxide Cr 2o 3, cobalt sesquioxide Co 2o 3, silicon-dioxide SiO 2, aluminum nitrate Al (NO 3) 3, silver suboxide Ag 2o,
Preparation process comprises preparation auxiliary interpolation slurry, interpolation ZnO, interpolation aluminum ion, adds silver ions, shaping, sintering,
Described raw materials also comprises Yttrium trinitrate Y (NO 3) 3or yttrium oxide Y 2o 3in one.
The mol ratio of each raw materials is:
ZnO：Bi 2O 3：Sb 2O 3：MnO 2：Cr 2O 3：Co 2O 3：SiO 2：Al(NO 3) 3：Ag 2O：Y(NO 3) 3＝87.5～95.8:0.5-2.0:0.5-1.5:0.5-1.0:0.5-1.0:0.5-1.5:1.0-2.0:0.1-1.0:0.1-1.0：1.0-1.5。
ZnO：Bi 2O 3：Sb 2O 3：MnO 2：Cr 2O 3：Co 2O 3：SiO 2：Al(NO 3) 3：Ag 2O：Y 2O 3＝87.5～95.8:0.5-2.0:0.5-1.5:0.5-1.0:0.5-1.0:0.5-1.5:1.0-2.0:0.1-1.0:0.1-1.0：1.0-1.5。
Preparation is auxiliary to be added in slurry stage, and composition comprises Bi 2o 3, Sb 2o 3, MnO 2, Cr 2o 3, Co 2o 3, SiO 2the auxiliary preparation method adding slurry is the sand milling that adds water, and the sand milling time that adds water is 1-3h, and the water added in the sand grinding process that adds water is deionized water, add deionized water and described auxiliary interpolation slurry ratio of quality and the number of copies be deionized water 2 parts, auxiliaryly add 1 part, slurry
The Bi added 2o 3, MnO 2, Cr 2o 3, Co 2o 3, SiO 2the mol ratio of composition is: 0.5-2.0:0.5-1.5:0.5-1.0:0.5-1.0:0.5-1.5:1.0-2.0.
Described forming step is compression molding, and use the cylindrical die of hydraulic pressure tabletting machine and diameter 50mm, by the particulate material compression molding after drying-granulating, forming pressure is 150MPa, molding time 3min.
Adopt High Temperature Furnaces Heating Apparatus to sinter, adopt the heat-up rate of 100 ~ 250 DEG C/h, make High Temperature Furnaces Heating Apparatus rise to 400 DEG C, under 400 DEG C of environment, be incubated binder removal 5h, from room temperature to sintering temperature 1240 ~ 1260 DEG C, be incubated 3 ~ 4h at a sintering temperature, make ceramic sintered compact.
Add in ZnO process, the ZnO added adds Bi in slurry with auxiliary 2o 3mol ratio be 87.5 ~ 95.8:0.5-2.0, carry out mixed sand mill after adding ZnO and form slurry, mixed sand time consuming is 0.5-1h, and need to add deionized water in mixing sand grinding process, the deionized water added and the ratio of quality and the number of copies of slurry are deionized water 1 part, slurry 1-2 part.
Add in aluminum ion, silver ions, ruthenium ion step:
Add Al (NO 3) 3, Ag 2o, Y (NO 3) 3be 0.1-1.0:0.1-1.0:87.5 ~ 95.8 with the mol ratio of ZnO in slurry, continue sand milling, form powder;
Add Al (NO 3) 3, Ag 2o, Y 2o 3be 0.1-1.0:0.1-1.0:0.5 ~ 1.5:87.5 ~ 95.8 with the mol ratio of ZnO in slurry, continue sand milling, form powder.
Embodiment one:
1) preparation of raw material
This low residual voltage ZnO varistor ceramic material prepares initial feed in following ratio ZnO (90.5mol%), Bi2O3 (1.5mol%), Sb2O3 (1mol%), MnO2 (1mol%), Cr2O3 (1mol%), Co2O3 (1mol%), SiO2 (1.5mol%), Al (NO3) 3 (1mol%), Ag2O (0.5mol%) and Y (NO3) 3 (1mol%).
2) preparation is auxiliary adds slurry
Bi2O3 (1.5mol%), Sb2O3 (1mol%), MnO2 (1mol%), Cr2O3 (1mol%), Co2O3 (1mol%) and SiO2 (1.5mol%) are put into the sand milling tank of horizontal sand mill, add the deionized water of powder weight 1.5 times, sand milling 2 hours.
3) by auxiliary interpolation slurry and ZnO mixing
Add the ZnO of 90.5%mol in auxiliary interpolation slurry after sand milling, add the deionized water of powder weight 1 times, by all mixing raw material mixing sand millings 1 hour, to being uniformly dispersed.
4) aluminium, silver and ruthenium ion is added
In the ZnO slurry mixed, add Al (NO3) 3 (1mol%), Ag2O (0.5mol%) and Y (NO3) 3 (1mol%), continue sand milling 1 hour.
5) shaping
The powder obtained in previous step is carried out spraying dry drying, moisture after, use the cylindrical die of hydraulic pressure tabletting machine and diameter 50mm, by particulate material compression molding, forming pressure is 150MPa, 3 minutes dwell times.
6) sinter
With high-temperature electric resistance furnace sintered body in closed atmosphere, actual temp and the period as follows:
From room temperature to 400 DEG C, 2 hours heating-up times;
Binder removals 5 hours are incubated at 400 DEG C;
From 400 DEG C to 900 DEG C, 3 hours heating-up times;
From 900 DEG C to 1250 DEG C, 3 hours heating-up times;
1250 DEG C of insulations 3 hours;
Temperature fall.
Properties test has been carried out to the ZnO varistor sample prepared by above technique.Its breakdown voltage gradient average 440V/mm, 2ms square wave discharge capacity reaches 535J/cm3, and its leakage current is inhibited, average 0.98A/cm2, nonlinear factor average 79, residual voltage ratio average 1.52.
Embodiment two:
1) preparation of raw material
This low residual voltage ZnO varistor ceramic material prepares initial feed in following ratio ZnO (95.3mol%), Bi2O3 (0.5mol%), Sb2O3 (0.5mol%), MnO2 (0.5mol%), Cr2O3 (0.5mol%), Co2O3 (0.5mol%), SiO2 (1mol%), Al (NO3) 3 (0.6mol%), Ag2O (0.1mol%) and Y2O3 (0.5mol%).
2) preparation is auxiliary adds slurry
Bi2O3 (0.5mol%), Sb2O3 (0.5mol%), MnO2 (0.5mol%), Cr2O3 (0.5mol%), Co2O3 (0.5mol%), SiO2 (1mol%) are put into the sand milling tank of horizontal sand mill, add the deionized water of powder weight 1 times, sand milling 2 hours.
3) by auxiliary interpolation slurry and ZnO mixing
Add the ZnO of 95.3%mol in auxiliary interpolation slurry after sand milling, add the deionized water of powder weight 1.5 times, by all mixing raw material mixing sand millings 1 hour, to being uniformly dispersed.
4) aluminium, silver and ruthenium ion is added
In the ZnO slurry mixed, add Al (NO3) 3 (0.6mol%), Ag2O (0.1mol%) and Y2O3 (0.5mol%), continue sand milling 1 hour.
5) shaping
The powder obtained in previous step is carried out spraying dry, moisture after, use the cylindrical die of hydraulic pressure tabletting machine and diameter 50mm, by particulate material compression molding, forming pressure is 150MPa, 3 minutes dwell times.
6) sinter
With high-temperature electric resistance furnace sintered body in closed atmosphere, actual temp and the period as follows:
From room temperature to 400 DEG C, 2 hours heating-up times;
Binder removals 5 hours are incubated at 400 DEG C;
From 400 DEG C to 900 DEG C, 3 hours heating-up times;
From 900 DEG C to 1250 DEG C, 3 hours heating-up times;
1240 DEG C of insulations 4 hours;
Temperature fall.
Properties test has been carried out to the ZnO varistor sample prepared by above technique.Its breakdown voltage gradient average 465V/mm, 2ms square wave discharge capacity reaches 509J/cm3, and its leakage current is inhibited, average 0.99A/cm2, nonlinear factor average 74, residual voltage ratio average 1.49.
Embodiment three:
1) preparation of raw material
This low residual voltage ZnO varistor ceramic material prepares initial feed in following ratio ZnO (87.5mol%), Bi2O3 (2mol%), Sb2O3 (1.5mol%), MnO2 (1mol%), Cr2O3 (1mol%), Co2O3 (1.5mol%), SiO2 (2mol%), Al (NO3) 3 (1mol%), Ag2O (1mol%) and Y (NO3) 3 (1.5mol%).
2) sand milling adjunct is prepared
Bi2O3 (2mol%), Sb2O3 (1.5mol%), MnO2 (1mol%), Cr2O3 (1mol%), Co2O3 (1.5mol%) and SiO2 (2mol%) are put into the sand milling tank of horizontal sand mill, add the deionized water of powder weight 1.5 times, sand milling 2 hours.
3) by auxiliary interpolation slurry and ZnO mixing
Add the ZnO of 87.5%mol in auxiliary interpolation slurry after sand milling, add the deionized water of powder weight 0.5 times, by all mixing raw material mixing sand millings 1 hour, to being uniformly dispersed.
4) aluminium, silver and ruthenium ion is added
In the ZnO slurry mixed, add Al (NO3) 3 (1mol%), Ag2O (1mol%) and Y (NO3) 3 (1.5mol%), continue sand milling 1 hour.
5) shaping
The powder obtained in previous step is carried out spraying dry, moisture after, use the cylindrical die of hydraulic pressure tabletting machine and diameter 50mm, by particulate material compression molding, forming pressure is 150MPa, 3 minutes dwell times.
6) sinter
With high-temperature electric resistance furnace sintered body in closed atmosphere, actual temp and the period as follows:
From room temperature to 400 DEG C, 2 hours heating-up times;
Binder removals 5 hours are incubated at 400 DEG C;
From 400 DEG C to 900 DEG C, 3 hours heating-up times;
From 900 DEG C to 1250 DEG C, 3 hours heating-up times;
1260 DEG C of insulations 3 hours;
Temperature fall.
Properties test has been carried out to the ZnO varistor sample prepared by above technique.Its breakdown voltage gradient average 496V/mm, 2ms square wave discharge capacity reaches 517J/cm3, and its leakage current is inhibited, average 0.94A/cm2, nonlinear factor average 77, residual voltage ratio average 1.53.
Adopting traditional raw material mixed grinding technique and sintering process, by adjusting composition and the ratio of adjunct, in ZnO and mixed slurry, with the addition of Al, Ag and Rare Earth Y element simultaneously.Under the acting in conjunction of Al and Ag ion, in sintering process, zinc lattice is entered in Al and Ag solid solution, reduce grain resistance, reduce the residual voltage in big current district, the existence of Ag ion, makes the quantity of interstitial zinc ions decline, improves the age stability performance of ZnO varistor pottery, with add Al Ion Phase ratio merely, leakage current is also effectively suppressed.The rare earth element y added, in the process of liquid phase sintering, effectively inhibits the growth of ZnO crystal grain, impels knee voltage U1mA to be significantly improved; On V-I rational curve, reversal zone moves to right, and improves the ability of the ZnO varistor leakage current of this formula preparation.In sum, can control breakdown voltage gradient and be not less than 450V/mm, 2ms square wave discharge capacity reaches more than 500J/cm3, and in addition, can control its leakage current at below 1A/cm2, nonlinear factor is more than 70, and residual voltage ratio controls to less than 1.5.Prepared ZnO varistor pottery, possess the advantage that gradient is high, discharge capacity is large, in addition, this based varistor also possesses the feature that residual voltage is low, Leakage Current is little, aging resistance is stable.
Technique scheme only embodies the optimal technical scheme of technical solution of the present invention, and those skilled in the art all embody principle of the present invention to some variations that wherein some part may be made, and belong within protection scope of the present invention.

Claims (7)

1. a high-gradient, large discharge capacity system for ultra-high voltage transmission voltage-sensitive ceramic preparation method, it is characterized in that, raw materials comprises zinc oxide ZnO, bismuth oxide Bi2O3, antimonous oxide Sb2O3, Manganse Dioxide MnO2, chromic oxide Cr2O3, cobalt sesquioxide Co2O3, silicon-dioxide SiO2, aluminum nitrate Al (NO3) 3, silver suboxide Ag2O
Preparation process comprises preparation auxiliary interpolation slurry, interpolation ZnO, interpolation aluminum ion, adds silver ions, shaping, sintering,
Described raw materials also comprises the one in Yttrium trinitrate Y (NO3) 3 or yttrium oxide Y2O3.
2., according to the high-gradient described in claim 1, large discharge capacity system for ultra-high voltage transmission voltage-sensitive ceramic preparation method, it is characterized in that, the mol ratio of each raw materials is:
ZnO：Bi2O3：Sb2O3：MnO2：Cr2O3：Co2O3：SiO2：Al(NO3)3：Ag2O：Y(NO3)3＝87.5～95.8:0.5-2.0:0.5-1.5:0.5-1.0:0.5-1.0:0.5-1.5:1.0-2.0:0.1-1.0:0.1-1.0：1.0-1.5。
ZnO：Bi2O3：Sb2O3：MnO2：Cr2O3：Co2O3：SiO2：Al(NO3)3：Ag2O：Y2O3＝87.5～95.8:0.5-2.0:0.5-1.5:0.5-1.0:0.5-1.0:0.5-1.5:1.0-2.0:0.1-1.0:0.1-1.0：1.0-1.5。
3. according to the high-gradient described in claim 1, large discharge capacity system for ultra-high voltage transmission voltage-sensitive ceramic preparation method, it is characterized in that, preparation is auxiliary to be added in slurry stage, composition comprises Bi2O3, Sb2O3, MnO2, Cr2O3, Co2O3, SiO2, the auxiliary preparation method adding slurry is the sand milling that adds water, sand milling time that adds water is 1-3h, the water added in sand grinding process that adds water is deionized water, add deionized water and described auxiliary interpolation slurry ratio of quality and the number of copies be deionized water 2 parts, auxiliaryly add 1 part, slurry
The mol ratio of Bi2O3, MnO2, Cr2O3, Co2O3, SiO2 composition added is: 0.5-2.0:0.5-1.5:0.5-1.0:0.5-1.0:0.5-1.5:1.0-2.0.
4. according to the high-gradient described in claim 1, large discharge capacity system for ultra-high voltage transmission voltage-sensitive ceramic preparation method, it is characterized in that, described forming step is compression molding, use the cylindrical die of hydraulic pressure tabletting machine and diameter 50mm, by the particulate material compression molding after drying-granulating, forming pressure is 150MPa, molding time 3min.
5. according to the high-gradient described in claim 1, large discharge capacity system for ultra-high voltage transmission voltage-sensitive ceramic preparation method, it is characterized in that, High Temperature Furnaces Heating Apparatus is adopted to sinter, adopt the heat-up rate of 100 ~ 250 DEG C/h, make High Temperature Furnaces Heating Apparatus rise to 400 DEG C, under 400 DEG C of environment, be incubated binder removal 5h, from room temperature to sintering temperature 1240 ~ 1260 DEG C, be incubated 3 ~ 4h at a sintering temperature, make ceramic sintered compact.
6. according to the high-gradient described in claim 3, large discharge capacity system for ultra-high voltage transmission voltage-sensitive ceramic preparation method, it is characterized in that, add in ZnO process, the ZnO added is 87.5 ~ 95.8:0.5-2.0 with auxiliary mol ratio of adding Bi2O3 in slurry, carry out mixed sand mill after adding ZnO and form slurry, mixed sand time consuming is 0.5-1h, and need to add deionized water in mixing sand grinding process, the deionized water added and the ratio of quality and the number of copies of slurry are deionized water 1 part, slurry 1-2 part.
7. according to the high-gradient described in claim 6, large discharge capacity system for ultra-high voltage transmission voltage-sensitive ceramic preparation method, it is characterized in that, add in aluminum ion, silver ions, ruthenium ion step:
Adding Al (NO3) 3, Ag2O, Y (NO3) 3 with the mol ratio of ZnO in slurry is 0.1-1.0:0.1-1.0:87.5 ~ 95.8, continues sand milling, forms powder;
The mol ratio adding ZnO in Al (NO3) 3, Ag2O, Y2O3 and slurry is 0.1-1.0:0.1-1.0:0.5 ~ 1.5:87.5 ~ 95.8, continues sand milling, forms powder.
CN201510997604.2A 2015-12-25 2015-12-25 Preparation method of high-gradient and large-discharge-current-capacity voltage-sensitive ceramics for ultra-high-voltage power transmission system Pending CN105565801A (en)

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CN106892658A (en) * 2017-04-13 2017-06-27 贵州大学 In3+、Ga3+Compound donor doping ZnO voltage-sensitive ceramics and preparation method
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