CN110937901A - Preparation process of novel high-energy low-leakage ceramic valve plate - Google Patents
Preparation process of novel high-energy low-leakage ceramic valve plate Download PDFInfo
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/89—Coating or impregnation for obtaining at least two superposed coatings having different compositions
- C04B41/90—Coating or impregnation for obtaining at least two superposed coatings having different compositions at least one coating being a metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
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- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
- C04B2235/424—Carbon black
Abstract
The invention relates to a preparation process of a novel high-energy low-leakage ceramic valve plate, belonging to the technical field of valve plate processing, and the process comprises the following steps: (1) preparing materials; (2) mixing materials; (3) drying and forming; (4) pre-burning; then, the ceramic valve plate is taken out when the temperature of the ceramic valve plate is reduced to 650-750 ℃ along with a furnace, and aluminum electrodes are sprayed on two end faces of the ceramic valve plate; this application batching is for independently researching and developing the design, ceramic valve block after with the sintering is cooled down along with the stove, carry out the aluminium electrode of spouting when cooling to 650~750 ℃, the surface difference in temperature of aluminium electrode and ceramic valve block is less, the aluminium welding wire melts very fast under spot welder blow-welding effect, even coating is on the surface of ceramic valve block, make aluminium electrode and ceramic valve block combine together better, show the leakproofness that has improved the ceramic valve block both ends that use carborundum as the main material, prevent that moisture from invading from the air gap, reduce leakage current's production volume, the realization has prepared the ceramic valve block that has higher energy density simultaneously concurrently and less leakage current.
Description
Technical Field
The invention relates to the technical field of valve plate processing, in particular to a preparation process of a novel high-energy low-leakage ceramic valve plate.
Background
The valve plate is a resistance plate with nonlinear volt-ampere characteristics, is low in resistance when in overvoltage, so that the voltage on the arrester is limited, and is high in resistance when in normal power frequency voltage, so that the current passing through the arrester can be limited.
For example, the Chinese patent with the publication number of CN101383208B in the prior patent discloses a preparation method of a high-voltage gradient zinc oxide varistor valve plate, which belongs to the technical field of electrical materials, the raw materials are prepared according to the mol percentage of the raw materials, deionized water is added into the prepared zinc oxide doped raw materials to be used as a dispersing agent, a polyvinyl alcohol aqueous solution is added to be used as a bonding agent, a grinding ball made of pure silicon oxide is used for grinding, slurry after ball grinding is dried and added with deionized water to be stirred to form water-containing particles, tabletting and forming are carried out, glue discharging, sintering, grinding the plate, cleaning and aluminum spraying are carried out to insulate the upper side surface of the valve plate3Above, can use in the arrester of extra-high voltage, improved the fail safe nature of arrester.
However, the high-pressure zinc oxide resistance valve plate has the defects that the high-pressure zinc oxide resistance valve plate only has ideal protection capability on overvoltage and surge with narrow pulse width, the energy density is small, the risk of burning is existed, the silicon carbide valve plate has large energy density, but when two ends of the silicon carbide valve plate are sealed, air gaps are easily generated in the valve plate, and the leakage current is increased due to the fact that moisture enters the valve plate.
Disclosure of Invention
The invention aims to provide a preparation process of a novel high-energy low-leakage ceramic valve plate, which can ensure that the prepared ceramic valve plate has higher energy density and smaller leakage current at the same time.
The above object of the present invention is achieved by the following technical solutions:
a preparation process of a novel high-energy low-leakage ceramic valve plate comprises the following steps:
(1) preparing materials: weighing 98-99 parts of silicon carbide powder, 1-1.5 parts of conductive carbon black and 0.3-1 part of binder according to parts by weight; (2) mixing materials; (3) drying and forming: drying the mixed slurry, and forming by adopting a stamping type press; (4) pre-burning: placing the blank body in a sintering furnace, controlling the temperature to be 490-510 ℃, and keeping for 2-3 h; introducing hydrogen after pre-sintering, heating to 1400-1600 ℃, and then preserving heat for 70-75 h; and then cooling the ceramic valve plate to 650-750 ℃ along with the furnace, taking out the ceramic valve plate, spraying aluminum electrodes on two end surfaces of the ceramic valve plate, continuing to naturally cool and cool, and spraying insulating paint on the side surface of the ceramic valve plate.
By adopting the technical scheme, the main material powder is silicon carbide powder, silicon carbide (SiC) is a compound material consisting of silicon and carbon, the silicon carbide powder is very stable in the aspects of heat, chemistry and machinery, the SiC has higher carrier mobility and higher energy density, and a SiC power device has the characteristics of high pressure resistance, low loss, high efficiency and the like, and belongs to an ideal power device; silicon carbide powder, conductive carbon black and a binder are blended, the ingredients are designed for independent research and development, the components are uniformly mixed, drying and sintering are carried out, the sintered ceramic valve plate is cooled along with a furnace, when the temperature is reduced to 650-750 ℃, aluminum electrodes are sprayed to two ends of the ceramic valve plate, the surface temperature difference between the aluminum electrodes and the ceramic valve plate is small, aluminum welding wires are quickly melted under the blow welding action of a spot welder and are uniformly coated on the end face of the ceramic valve plate, so that the aluminum electrodes and the ceramic valve plate are better combined together, the sealing performance of two ends of the ceramic valve plate taking silicon carbide as a main material is remarkably improved, moisture is prevented from invading from an air gap, the generation amount of leakage current is reduced, and the ceramic valve plate simultaneously having high energy density and small leakage current is prepared.
The invention is further configured to: the silicon carbide powder is compounded with the plant ash according to the weight ratio of 1: 13.
By adopting the technical scheme, the plant ash is the residue of the burned plant and can be used as fuel after being recovered, the main components of the plant ash are carbon and metal oxide, and the plant ash also contains some trace elements, the plant ash and the silicon carbide powder are compounded, and then the ceramic valve plate is formed after high-temperature sintering, so that the energy density of the valve plate can be further improved; in addition, the plant ash also belongs to waste recycling, and has excellent energy-saving and environment-friendly effects.
The invention is further configured to: and (3) in the step (2), introducing airflow into the main material powder to be dispersed to form a dispersion carrier, and then putting the conductive carbon black and the binder into the dispersion carrier to be uniformly mixed.
Through adopting above-mentioned technical scheme, let in the air current in to main material powder, main material powder moves along with the motion of air current, with conductive carbon black, binder evenly add in the dispersion carrier, be favorable to multiple powder with the high-speed striking of random state together, carry out high-speed friction between the powder, can improve the electrostatic absorption between each component, be favorable to promoting the improvement of this valve block both ends leakproofness.
The invention is further configured to: the adhesive is prepared by mixing the following components in parts by weight: 25-35 parts of anionic clay, 10-15 parts of acetylene black, 5-10 parts of corn starch and 40-50 parts of water.
By adopting the technical scheme, the specific surface area of the anionic clay is large, and acetylene black and corn starch are attached to the anionic clay, so that the prepared adhesive has excellent adhesion and good thermal conductivity, and the compactness of the valve plate after being sintered is improved after the adhesive is added into main material powder; and the good heat dissipation performance of the valve plate can be promoted.
The invention is further configured to: the material mixing process adopts a gas-liquid mixing device to mix, the gas-liquid mixing device comprises an outer tank, an inner tank, a closed cover, a liquid inlet pipe, an air inlet flow pipe, a pressure reducing pipe, a dispersing assembly and a circulating scattering assembly, the outer tank and the inner tank are sleeved inside and outside, the dispersing assembly and the circulating scattering assembly are arranged in the inner tank, the liquid inlet pipe penetrates through the closed cover and extends to the middle of the inner tank, the air inlet flow pipe is arranged on the closed cover and extends to the inner tank, the pressure reducing pipe is arranged on the closed cover, the liquid inlet pipe receives liquid in the liquid inlet pipe, a liquid passing hole is formed in the side wall, close to the tank bottom, of the inner tank, one end of the circulating scattering assembly is connected with the bottom of the outer tank, and the other end of.
Through adopting above-mentioned technical scheme, to the intraductal injection binder class liquid material of feed liquor, utilize the dispersion subassembly to stir liquid material, the dispersion, form fast-speed fluid, main material powder adds the inner tank with the gaseous state, the powder air current mixes with liquid material, the dispersion, utilize the circulation to break up the subassembly and mix once more the mixture, the circulation stirring, cross the liquid hole and still play further filtering action to the mixture, this gas-liquid mixing device is applicable to the powder air current and mixes with liquid material, help the homogeneous mixing of mixture.
The invention is further configured to: the dispersion subassembly includes first motor, the uncovered centrifuge bowl that links to each other with the motor shaft of first motor and with the stirring rake of the motor shaft synchronous motion of first motor, the equipartition has the liquid outlet hole on the lateral wall of uncovered centrifuge bowl, first motor is fixed at outer tank bottom center, the feed liquor pipe extends to in the uncovered centrifuge bowl.
By adopting the technical scheme, the motor drives the open centrifugal cylinder to rotate at a high speed, and under the action of centrifugal force, the liquid material is thrown out through the liquid outlet hole to form fluid moving at a high speed, so that the liquid material is favorably impacted and mixed with airflow-state substances flowing at a high speed, and the surfaces of all components in the gas-flow-state powder have electrostatic adsorption force, thereby being favorable for further improving the uniform mixing of powder airflow and the high-speed fluid.
The invention is further configured to: the circulating scattering assembly comprises a diaphragm pump, a first pipeline and a second pipeline, one end of the first pipeline is connected with the bottom of the outer tank, the other end of the first pipeline is connected with the liquid inlet end of the diaphragm pump, one end of the second pipeline is connected with the liquid outlet end of the diaphragm pump, and the other end of the second pipeline extends to the position, close to the air inlet flow pipe, in the inner tank.
Through adopting above-mentioned technical scheme, under the effect of diaphragm pump, the deposit is in the inner tank bottom's miscellany again flows back to the inner tank through first pipeline, second pipeline, mixes the stirring once more with the gaseous powder, further improves the homogeneity to the miscellany.
The invention is further configured to: after sintering, centre gripping ceramic valve block shifts to on the upset platform, the upset platform includes frame, bearing frame, second motor, swinging boom, first connecting rod, second connecting rod, first upset pole and second upset pole and heat preservation cover, the bearing frame sets up at the frame upper surface, the heat preservation cover encloses to be established around the bearing frame, be equipped with heating element in the bearing frame inner wall, the motor shaft and the swinging boom middle part of second motor link to each other, the one end of first connecting rod, second connecting rod rotates respectively and connects the both ends at the swinging boom, first upset pole, second upset pole are the L shape, the one end that the swinging boom was kept away from to first connecting rod, second connecting rod is articulated mutually with the shortwall one end of first upset pole, second upset pole respectively, the turning of first upset pole, second upset pole rotates to be connected and lies in the bearing frame in the frame.
Through adopting above-mentioned technical scheme, the second motor drive swinging boom rotates, first connecting rod, the second connecting rod rotates along with the swinging boom is synchronous, and then drive first upset pole, the rotation of second upset pole, the reciprocal upset of ceramic valve block between first upset pole, second upset pole, heating element can guarantee to have higher temperature around the ceramic valve block, adopt above-mentioned upset platform, the convenience of workman when the spraying ceramic valve block has been improved greatly, still can improve showing the combination fastness that improves aluminium electrode and ceramic valve block.
In conclusion, the beneficial technical effects of the invention are as follows:
1. high energy and low leakage: by the formula and the sintering process, the prepared ceramic valve plate has high energy density and small leakage current;
2. the mixed material before pre-sintering is uniformly dispersed, and a gas-liquid mixing device is adopted for high-speed mixing, so that gas-flow powder and liquid material are uniformly mixed, and the dispersion uniformity of the mixed material is a key index of the preparation process;
3. when the aluminum electrode is sprayed, the ceramic valve plate is arranged on the bearing frame, when the complete side end face is sprayed, the ceramic valve plate can be automatically turned over, and the end face of the other side is sprayed, meanwhile, the bearing frame plays a role in heat preservation, and the aluminum electrode and the ceramic valve plate are favorably and better combined together.
Drawings
Fig. 1 is a schematic structural diagram of the turning platform in the embodiment.
Fig. 2 is a schematic structural view of the gas-liquid mixing device in this embodiment.
Fig. 3 is an internal sectional view of the gas-liquid mixing device of the present embodiment.
In the figure, 1, an outer tank; 2. an inner tank; 21. a liquid passing hole; 3. a closure cap; 4. a liquid inlet pipe; 5. an air inlet flow pipe; 6. a pressure reducing tube; 7. a dispersion assembly; 71. a first motor; 72. an open centrifugal cylinder; 721. a liquid outlet hole; 73. a stirring paddle; 8. circulating and scattering the components; 81. a diaphragm pump; 82. a first pipeline; 83. a second pipeline; 9. overturning the platform; 91. a frame; 92. a bearing frame; 93. a second motor; 94. a rotating arm; 95. a first link; 96. a second link; 97. a first turning bar; 98. a second turning bar; 99. and (4) a heat preservation cover.
Detailed Description
The present invention will be described in further detail with reference to the following examples and the accompanying drawings.
Acetylene black was purchased from acetylene black produced by Tianjin Yibo Rui chemical Co., Ltd, CAS: 1333-86-4; corn starch was purchased from suzhou blue-jet chemical technology ltd, CAS: 9005-25-8; the plant ash is purchased from Xinghua Sannong plant ash Co., Ltd; the anionic clay was prepared according to the method described in "preparation and characterization of anionic clay and study of its adsorption property to DNA" published by Li bin, university of south China's Rich chemical industry ".
Preparation of raw materials example one:
the adhesive is prepared by mixing the following components in parts by weight: 25 parts of anionic clay, 10 parts of acetylene black, 5 parts of corn starch and 40 parts of water are weighed.
Preparation example two of raw materials:
the adhesive is different from the first raw material preparation example in the content of components: 30 parts of anionic clay, 12 parts of acetylene black, 8 parts of corn starch and 45 parts of water are weighed.
Preparation example three of raw materials:
the adhesive is different from the first raw material preparation example in the content of components: 35 parts of anionic clay, 15 parts of acetylene black, 10 parts of corn starch and 50 parts of water are weighed.
Raw material comparative example one:
a binding agent selects a polyvinyl alcohol aqueous solution with the mass concentration of 45 percent as the binding agent.
Comparative raw material example two:
a binder which differs from the first raw material preparation in the absence of anionic clay.
Raw material comparative example three:
a binder which differs from the first raw material preparation in the absence of acetylene black.
Comparative raw material example four:
a binder which differs from the first feedstock preparation by the absence of anionic clay and acetylene black.
The first embodiment is as follows:
a preparation process of a novel high-energy low-leakage ceramic valve plate comprises the following steps:
(1) preparing materials: weighing 98 parts of silicon carbide powder, 1 part of conductive carbon black and 0.3 part of binder prepared in the first raw material preparation example;
(2) mixing materials: grinding in a ball mill at the rotating speed of 180r/min for 10 h;
(3) drying and forming: drying the mixed slurry at 120 deg.C, drying with spray drying agent to obtain powder, and molding with a stamping press under 8Mpa/cm2Keeping the pressure for 2.5 minutes, wherein the size of the molded blank is phi =30mm in diameter and h =4mm in height;
(4) pre-burning: placing the blank body in a sintering furnace, controlling the temperature to be 500 ℃, and keeping for 2.5 hours;
(5) grinding: after pre-burning, surface grinding is carried out in a manual mode;
(6) and (3) sintering: introducing hydrogen after presintering, heating to 1500 ℃, and then preserving heat for 70 h;
(7) aluminum spraying: and then taking out the ceramic valve plate when the temperature of the ceramic valve plate is reduced to 650 ℃ along with the furnace, spraying aluminum electrodes on two end surfaces of the ceramic valve plate, continuing to naturally cool and reduce the temperature, and spraying insulating paint on the side surface of the ceramic valve plate.
Referring to fig. 1, in the aluminum spraying process, aluminum is sprayed on the turning platform 9, after sintering, the manually clamped ceramic valve sheet is transferred onto the turning platform 9, the turning platform 9 includes a frame 91, a bearing frame 92, a second motor 93, a rotating arm 94, a first connecting rod 95, a second connecting rod 96, a first turning rod 97, a second turning rod 98 and a heat-insulating cover 99, the bearing frame 92 is arranged on the upper surface of the frame 91, the heat-insulating cover 99 is arranged around the bearing frame 92, a heating element (not shown) is arranged in the inner wall of the bearing frame 92, a motor shaft of the second motor 93 is connected with the middle part of the rotating arm 94, one ends of the first connecting rod 95 and the second connecting rod 96 are respectively rotatably connected to two ends of the rotating arm 94, the first turning rod 97 and the second turning rod 98 are L-shaped, corners of the first turning rod 97 and the second turning rod 98 are obtuse angles, and one ends of the first connecting rod 95 and the second connecting rod 96 far away from the rotating arm 94, The shortwall one end of second upset pole 98 is articulated mutually, first upset pole 97, the turning of second upset pole 98 is rotated and is connected and be located bearing frame 92 on frame 91, second motor 93 drive swinging boom 94 rotates, first connecting rod 95, second connecting rod 96 rotates along with swinging boom 94 is synchronous, and then drive first upset pole 97, second upset pole 98 overturns, when needs spout aluminium, arrange the ceramic valve block in first upset pole 97 earlier on, treat that a side end face accomplishes the spraying after, second motor 93 works, upset ceramic valve block is to second upset pole 98 on, carry out the spraying operation once more.
Example two:
the preparation process of the novel high-energy low-leakage ceramic valve plate is different from the first embodiment in that the adhesive is prepared from the second raw material preparation example.
Example three:
the preparation process of the novel high-energy low-leakage ceramic valve plate is different from the preparation process of the first embodiment in that the binder is prepared from the third preparation example of raw materials.
Example four: a preparation process of a novel high-energy low-leakage ceramic valve plate is different from that of the second embodiment in the content of the ceramic valve plate, and comprises the following steps of weighing 98.5 parts by weight of silicon carbide powder, 1.2 parts by weight of conductive carbon black and 0.7 part by weight of a binder prepared in the second raw material preparation example.
Example five:
the preparation process of the novel high-energy low-leakage ceramic valve plate is different from that of the second embodiment in the content of the ceramic valve plate, and comprises the following steps of weighing 99 parts by weight of silicon carbide powder, 1.5 parts by weight of conductive carbon black and 1 part by weight of binder prepared in the second raw material preparation example.
Example six:
a preparation process of a novel high-energy low-leakage ceramic valve plate is different from that of the second embodiment in the formula of the ceramic valve plate, and comprises the following steps of weighing 91 parts by weight of silicon carbide powder, 7 parts by weight of plant ash, 1 part by weight of conductive carbon black and 0.3 part by weight of a binder prepared in the second raw material preparation example.
Example seven:
the preparation process of the novel high-energy low-leakage ceramic valve plate is different from the sixth embodiment in the material mixing process, airflow is introduced into a compound of silicon carbide powder and plant ash to break up the compound to form a dispersion carrier, and then conductive carbon black and a binder are added into the dispersion carrier to be uniformly mixed.
Referring to fig. 2 and 3, a self-made gas-liquid mixing device is adopted for mixing in the material mixing process, the gas-liquid mixing device adopts an outer tank 1, an inner tank 2, a closed cover 3, a liquid inlet pipe 4, an air inlet pipe 5, a pressure reducing pipe 6, a dispersing component 7 and a circulating scattering component 8 which are arranged in the inner tank 2, the liquid inlet pipe 4 is arranged on the closed cover 3 in a penetrating way and extends to the middle part of the inner tank 2, the air inlet pipe 5 is arranged on the closed cover 3 and extends to the inner tank 2, the dispersing component 7 receives material liquid in the liquid inlet pipe 4, a liquid passing hole 21 is arranged on the side wall of the inner tank 2 close to the closed cover 3, one end of the circulating scattering component 8 is connected with the bottom of the outer tank 1, the other end of the circulating scattering component 8 is connected with the side wall of the inner tank 2 above the liquid passing hole 21, the liquid material is fed from the liquid inlet pipe 4, the dispersing component 7 receives the liquid material and disperses the liquid material, powder in gas flow state and liquid material mix, and the circulation is broken up subassembly 8 and is gone into inner tank 2 to the mixed material circulating pump of deposit in inner tank 2 bottom, crosses liquid hole 21 and plays further filtering action to the mixed material, is showing the thick liquids fineness after having improved the mixture.
Referring to fig. 3, the dispersing assembly 7 includes a first motor 71, an open centrifugal cylinder 72 connected to a motor shaft of the first motor 71, and a stirring paddle 73 moving synchronously with the motor shaft of the first motor 71, liquid outlet holes 721 are uniformly distributed on a side wall of the open centrifugal cylinder 72, the first motor 71 is fixed at the center of the bottom of the outer tank 1, the liquid inlet pipe 4 extends into the open centrifugal cylinder 72, the motor shaft of the first motor 71 penetrates the inner tank 2 and is connected to the bottom of the open centrifugal cylinder 72, the liquid material is conveyed into the open centrifugal cylinder 72 through the liquid inlet pipe 4, the first motor 71 drives the open centrifugal cylinder 72 to rotate, and the liquid material is thrown out with high-speed fluid under the centrifugal force.
Referring to fig. 3, the circulating scattering assembly 8 includes a diaphragm pump 81, a first pipeline 82 and a second pipeline 83, one end of the first pipeline 82 is connected to the bottom of the outer tank 1, the other end of the first pipeline 82 is connected to the liquid inlet end of the diaphragm pump 81, one end of the second pipeline 83 is connected to the liquid outlet end of the diaphragm pump 81, the other end of the second pipeline 83 extends into the inner tank 2 near the gas inlet flow pipe 5, under the action of the diaphragm pump 81, the mixed material deposited at the bottom of the inner tank 2 is pumped into the inner tank 2 through the first pipeline 82 and the second pipeline 83, the second pipeline 83 extends to a position near the gas inlet flow pipe 5, the ceramic powder in the gas flow state impacts the liquid material flowing out from the second pipeline 83, and the liquid material is sprayed out in the form of a shower head, which is helpful for improving the further uniform mixing of the ceramic powder in the gas flow state and.
Comparative example one:
the preparation process of the novel high-energy low-leakage ceramic valve plate is different from the second embodiment in that the adhesive is prepared from the first raw material proportion.
Comparative example two:
the preparation process of the novel high-energy low-leakage ceramic valve plate is different from the second embodiment in that the binder is prepared from the second raw material.
Comparative example three:
the preparation process of the novel high-energy low-leakage ceramic valve plate is different from the second embodiment in that the binder is prepared from the third raw material comparative example.
Comparative example four:
the preparation process of the novel high-energy low-leakage ceramic valve plate is different from the second embodiment in that the binder is prepared from the fourth raw material comparative example.
Comparative example five:
the preparation process of the novel high-energy low-leakage ceramic valve plate is different from the second embodiment in that conductive carbon black is lacked.
Comparative example six:
a preparation process of a novel high-energy low-leakage ceramic valve plate comprises the following steps:
(1) preparing materials: weighing 98 parts of silicon carbide powder, 1 part of conductive carbon black and 0.3 part of binder according to parts by weight;
(2) mixing materials;
(3) drying and forming: drying the mixed slurry, and forming by adopting a stamping type press;
(4) pre-burning: placing the blank body in a sintering furnace, controlling the temperature to be 500 ℃, and keeping for 2.5 hours;
(5) and (3) sintering: introducing hydrogen after presintering, heating to 1500 ℃, and then preserving heat for 70 h;
(6) aluminum spraying: and then cooling the ceramic valve plate to room temperature, spraying aluminum electrodes on two end surfaces of the ceramic valve plate, continuously cooling naturally, and spraying insulating paint on the side surface of the ceramic valve plate.
Comparative example seven:
the preparation process of the zinc oxide ceramic valve plate is different from the second embodiment in that the silicon carbide powder is replaced by the zinc oxide powder.
The detection means is as follows:
(1) leakage current: a leakage current tester is adopted to test the leakage current of the samples of each embodiment and the comparative example, and the experimental voltage is 100V; (2) energy density: and testing the energy density endured by the 2ms square wave by adopting a square wave tester.
The results of the measurements are shown in the following table
| Sample (I) | Leakage current (mA) | Energy density (J/cm)3） |
| Example one | 0.35 | 375 |
| Example two | 0.31 | 386 |
| EXAMPLE III | 0.32 | 382 |
| Example four | 0.28 | 393 |
| EXAMPLE five | 0.30 | 390 |
| EXAMPLE six | 0.10 | 415 |
| EXAMPLE seven | 0.05 | 420 |
| Comparative example 1 | 0.78 | — |
| Comparative example No. two | 0.65 | — |
| Comparative example No. three | 0.62 | — |
| Comparative example No. four | 0.70 | — |
| Comparative example five | 0.40 | — |
| Comparative example six | 0.80 | — |
| Comparative example seven | 0.28 | 180 |
According to the above table, in each embodiment of the application, after sintering, the temperature of the ceramic valve plate is reduced to 650-750 ℃ along with a furnace, and then the aluminum electrodes are welded on two end surfaces of the ceramic valve plate, so that the sealing performance of two ends of the ceramic valve plate is improved, and the leakage current of the ceramic valve plate is obviously reduced; according to the embodiments and the seventh comparative example, the ceramic valve plate using silicon carbide as main material powder has higher energy density, which is beneficial to improving the tolerance current value of the ceramic valve plate and reducing the damage of the ceramic valve plate; according to the first to third embodiments, the adhesive prepared by the second raw material preparation example is selected, so that the leakage current is minimum, and the performance of the adhesive prepared according to the proportion of the second raw material preparation example is optimal; according to the second embodiment, the fourth embodiment and the fifth embodiment, the minimum leakage current of the silicon carbide ceramic valve plate can reach 0.28mA, and the leakage current is remarkably reduced after silicon carbide powder is mixed with plant ash for compounding; after the adhesive is compared with the existing polyethylene glycol aqueous solution adhesive, the adhesive can firmly bond silicon carbide powder and conductive carbon black together, plays a role in moisture prevention, and obviously improves the sealing property at two ends of a ceramic valve plate; through the gas-liquid mixing device of embodiment seven self-controls, help carrying out better dispersion, mixing with powder material and liquid material, further improve the mixing uniformity of each component, help further improving the leakproofness at ceramic valve block both ends, and then reduce leakage current.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. A preparation process of a novel high-energy low-leakage ceramic valve plate comprises the following steps: (1) preparing materials: weighing 98-99 parts of silicon carbide powder, 1-1.5 parts of conductive carbon black and 0.3-1 part of binder according to parts by weight; (2) mixing materials; (3) drying and forming: drying the mixed slurry, and forming by adopting a stamping type press; (4) pre-burning: placing the blank body in a sintering furnace, controlling the temperature to be 490-510 ℃, and keeping for 2-3 h; the method is characterized in that: introducing hydrogen after pre-sintering, heating to 1400-1600 ℃, and then preserving heat for 70-75 h; and then cooling the ceramic valve plate to 650-750 ℃ along with the furnace, taking out the ceramic valve plate, spraying aluminum electrodes on two end surfaces of the ceramic valve plate, continuing to naturally cool and cool, and spraying insulating paint on the side surface of the ceramic valve plate.
2. The preparation process of the novel high-energy low-leakage ceramic valve plate according to claim 1, characterized in that: the silicon carbide powder is compounded with the plant ash according to the weight ratio of 1: 13.
3. The preparation process of the novel high-energy low-leakage ceramic valve plate according to claim 1 or 2, characterized in that: and (3) in the step (2), introducing airflow into the main material powder to be dispersed to form a dispersion carrier, and then putting the conductive carbon black and the binder into the dispersion carrier to be uniformly mixed.
4. The preparation process of the novel high-energy low-leakage ceramic valve plate according to claim 1, wherein the binder is prepared by mixing the following components in parts by weight: 25-35 parts of anionic clay, 10-15 parts of acetylene black, 5-10 parts of corn starch and 40-50 parts of water.
5. The preparation process of the novel high-energy low-leakage ceramic valve plate according to claim 1, characterized in that: the material mixing process adopts a gas-liquid mixing device for mixing, the gas-liquid mixing device comprises an outer tank (1) and an inner tank (2) which are sleeved inside and outside, a sealing cover (3), a liquid inlet pipe (4), a gas inlet pipe (5), a pressure reducing pipe (6), a dispersing assembly (7) and a circulating scattering assembly (8) which are arranged in the inner tank (2), the liquid inlet pipe (4) is arranged on the closing cover (3) in a penetrating way and extends to the middle part of the inner tank (2), the air inlet pipe (5) is arranged on the closing cover (3) and extends to the inner tank (2), the pressure reducing pipe (6) is arranged on the closing cover (3), the dispersing component (7) receives the feed liquid in the liquid inlet pipe (4), a liquid passing hole (21) is arranged on the side wall of the inner tank (2) close to the bottom of the tank, one end of the circulating scattering assembly (8) is connected with the bottom of the outer tank (1), the other end of the circulating scattering assembly (8) is connected with the side wall of the inner tank (2) close to the tank top.
6. The preparation process of the novel high-energy low-leakage ceramic valve plate according to claim 5, characterized in that: the dispersing component (7) comprises a first motor (71), an open centrifugal cylinder (72) connected with a motor shaft of the first motor (71) and a stirring paddle (73) synchronously moving with the motor shaft of the first motor (71), liquid outlet holes (721) are uniformly distributed on the side wall of the open centrifugal cylinder (72), the first motor (71) is fixed at the center of the bottom of the outer tank (1), and the liquid inlet pipe (4) extends into the open centrifugal cylinder (72).
7. The preparation process of the novel high-energy low-leakage ceramic valve plate according to claim 5, characterized in that: the circulation is broken up subassembly (8) and is included diaphragm pump (81), first pipeline (82) and second pipeline (83), the one end and the outer jar (1) bottom of first pipeline (82) link to each other, the other end of first pipeline (82) links to each other with the feed liquor end of diaphragm pump (81), the one end of second pipeline (83) links to each other with the play liquid end of diaphragm pump (81), the other end of second pipeline (83) extends to and is close to into in interior jar (2) and intake air pipe (5) department.
8. The preparation process of the novel high-energy low-leakage ceramic valve plate according to claim 1, characterized in that: after sintering, the ceramic valve block is clamped to the turnover platform (9), the turnover platform (9) comprises a rack (91), a bearing frame (92), a second motor (93), a rotating arm (94), a first connecting rod (95), a second connecting rod (96), a first turnover rod (97), a second turnover rod (98) and a heat-insulating cover (99), the bearing frame (92) is arranged on the upper surface of the rack (91), the heat-insulating cover (99) is arranged around the bearing frame (92), a heating element is arranged in the inner wall of the bearing frame (92), a motor shaft of the second motor (93) is connected with the middle of the rotating arm (94), one ends of the first connecting rod (95) and the second connecting rod (96) are respectively connected to two ends of the rotating arm (94) in a rotating mode, the first turnover rod (97) and the second turnover rod (98) are L-shaped, one ends, far away from the rotating arm (94), of the first connecting rod (95) and the second connecting rod (96) are respectively connected with the first turnover rod (97), One end of the short wall of the second turning rod (98) is hinged, and the corners of the first turning rod (97) and the second turning rod (98) are rotatably connected to the rack (91) and positioned in the bearing frame (92).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111584175A (en) * | 2020-05-25 | 2020-08-25 | 常州市武进科华电力电子器材有限公司 | Low-voltage surge protector |
| CN114107001A (en) * | 2021-12-03 | 2022-03-01 | 澧县鑫通化机械有限公司 | Large-scale circulating ventilation fermentation cylinder |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4994417A (en) * | 1984-03-26 | 1991-02-19 | Sumitomo Aluminum Smelting Company, Limited | Sintered silicon carbide articles |
| CN101383208A (en) * | 2008-10-27 | 2009-03-11 | 清华大学 | Preparation of high voltage gradient zinc oxide varistor valve |
| CN102244376A (en) * | 2010-05-13 | 2011-11-16 | 宜兴市丁山电瓷避雷器材厂 | SiC (silicon carbide) deexcitation resistor and manufacturing method thereof |
| CN203196563U (en) * | 2013-05-02 | 2013-09-18 | 玖龙纸业(重庆)有限公司 | Steam-liquid mixing device |
| CN103664180A (en) * | 2013-12-16 | 2014-03-26 | 武汉科技大学 | Method for preparing O'-Sialon/SiC composite ceramic powder from biomass power plant ash |
| CN203886517U (en) * | 2014-04-21 | 2014-10-22 | 奉化市辉宏有机硅化工有限公司 | Gas-liquid mixed reaction device |
| CN107725098A (en) * | 2017-11-08 | 2018-02-23 | 中国矿业大学(北京) | A kind of device for preventing and treating the mined out flame range of underground coal mine |
| CN109021905A (en) * | 2018-05-28 | 2018-12-18 | 成都市容德建筑劳务有限公司 | Moisture-proof adhesive and preparation method thereof |
-
2019
- 2019-12-07 CN CN201911245800.9A patent/CN110937901B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4994417A (en) * | 1984-03-26 | 1991-02-19 | Sumitomo Aluminum Smelting Company, Limited | Sintered silicon carbide articles |
| CN101383208A (en) * | 2008-10-27 | 2009-03-11 | 清华大学 | Preparation of high voltage gradient zinc oxide varistor valve |
| CN102244376A (en) * | 2010-05-13 | 2011-11-16 | 宜兴市丁山电瓷避雷器材厂 | SiC (silicon carbide) deexcitation resistor and manufacturing method thereof |
| CN203196563U (en) * | 2013-05-02 | 2013-09-18 | 玖龙纸业(重庆)有限公司 | Steam-liquid mixing device |
| CN103664180A (en) * | 2013-12-16 | 2014-03-26 | 武汉科技大学 | Method for preparing O'-Sialon/SiC composite ceramic powder from biomass power plant ash |
| CN203886517U (en) * | 2014-04-21 | 2014-10-22 | 奉化市辉宏有机硅化工有限公司 | Gas-liquid mixed reaction device |
| CN107725098A (en) * | 2017-11-08 | 2018-02-23 | 中国矿业大学(北京) | A kind of device for preventing and treating the mined out flame range of underground coal mine |
| CN109021905A (en) * | 2018-05-28 | 2018-12-18 | 成都市容德建筑劳务有限公司 | Moisture-proof adhesive and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 翟封祥等: "《材料成型工艺基础》", 28 February 2018, 哈尔滨工业大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111584175A (en) * | 2020-05-25 | 2020-08-25 | 常州市武进科华电力电子器材有限公司 | Low-voltage surge protector |
| CN114107001A (en) * | 2021-12-03 | 2022-03-01 | 澧县鑫通化机械有限公司 | Large-scale circulating ventilation fermentation cylinder |
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