CN214123713U - Mica capacitor with end of complete monolithic structure - Google Patents
Mica capacitor with end of complete monolithic structure Download PDFInfo
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- CN214123713U CN214123713U CN202120347162.8U CN202120347162U CN214123713U CN 214123713 U CN214123713 U CN 214123713U CN 202120347162 U CN202120347162 U CN 202120347162U CN 214123713 U CN214123713 U CN 214123713U
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Abstract
The utility model discloses a mica capacitor with a completely monolithic end, which comprises a capacitor core group formed by sintering interlaced and laminated mica silver sheets, wherein the end of the capacitor core group is of a completely monolithic structure; the mica silver sheet is characterized in that a large silver electrode layer and a small silver electrode layer are arranged on two sides of each mica sheet, wherein the height of the end of the large silver electrode layer and the height of the small silver electrode layer are equal to the width of the mica sheet, a barrier layer is reserved between the large silver electrode layer and the small silver electrode layer, and insulating edges with equal width are reserved on two side edges of the mica sheet on the large silver electrode layer; and two ends of the capacitor core group are coated with end silver paste. The utility model discloses highly extend the silver layer of end department to unanimous with the mica sheet width, the end part of adjacent mica silver piece is filled or is coated by the silver layer completely for its end is complete monolithic structure after the sintering, has filled the internal blank of the complete monolithic structure of current mica capacitor terminal electrode leading-out part, three-dimensional.
Description
Technical Field
The utility model belongs to the technical field of resistance-capacitance components and parts are made, a mica capacitor that end is complete monolithic structure is related to.
Background
Mica is a mineral containing aluminum silicate, and its main ingredient is Al2O3And SiO2The chemical composition is KAl2(ALSi3)O10(OH)2. Mica is an extremely important excellent inorganic insulating material, and as a dielectric material, the comprehensive performance of other materials can not exceed that of mica until now. Mica has the advantages of high dielectric strength, large dielectric constant, low loss, high chemical stability, low thermal expansion coefficient, good heat resistance, and easy peeling into thin sheets with uniform thickness.
Mica is easily assembled into a laminated capacitor in view of its excellent mechanical properties. The mica capacitor is a capacitor taking natural mica sheets as a medium, and due to the excellent performance of the mica medium, the mica capacitor has the following advantages that other capacitors cannot replace the mica capacitor.
1) The loss is small: when the capacity is less than or equal to 82pF, the loss is (10-30) × 10-4In the range, when the capacity is more than 82pF, the loss is 10 multiplied by 10-4The minimum can reach 3 x 10-4Hereinafter, even at very high temperatures, the loss is still within the allowable range;
2) temperature and time stability of capacityThe qualitative is good: the temperature coefficient can be stabilized at + -10 × 10-6In the range of/DEG C, the capacity of the material does not change more than +/-1% after being stored for 14 years under the specified storage condition;
3) excellent high-frequency characteristics: mica capacitors can operate at higher frequencies due to their small inherent inductance.
4) The precision is high: generally, the precision can reach +/-1%, +/-2% and +/-5%, and the highest precision can reach +/-0.01%.
5) The heat resistance is good: under the condition allowed by the external packaging material, the high-temperature mica capacitor with the temperature of more than 200 ℃ can be produced, and the glass packaging temperature can reach more than 300 ℃;
mica capacitors are widely used not only in instruments and meters of electronic, electric and communication equipment, but also in aerospace, aviation, navigation, rocket, satellite, military electronic equipment and oil exploration equipment, which have high requirements on stability and reliability.
The most important characteristics of mica capacitor are that its loss is small, and its resistance value is greater than 1X 1010Omega, high capacity precision and good voltage-resistant reliability. However, in the prior actual production process of the mica capacitor, the processes of generating more unqualified products with electric parameters are mainly concentrated on: voltage breakdown waste products in the core group voltage resistance test, capacity out-of-tolerance defective products in the capacity test, waste products with excessive loss in the finished product test, and high rejection rate generated in the finished product screening process. The formation and generation of these rejects, analyzed by the DPA structure, are directly related to the extraction reliability of the core pack.
SUMMERY OF THE UTILITY MODEL
The utility model provides a problem provide an end is mica capacitor of complete monolithic structure, has filled the internal blank of current mica capacitor end electrode leading-out part complete monolithic structure, three-dimensional, has guaranteed the reliability that mica capacitor core group drawn forth.
The utility model discloses a realize through following technical scheme:
a mica capacitor with a complete monolithic structure at the end comprises a capacitor core group formed by sintering mica silver sheets which are assembled in a staggered and laminated way, wherein the end of the capacitor core group is of a complete monolithic structure; the mica silver sheet is characterized in that a large silver electrode layer and a small silver electrode layer are arranged on two sides of each mica sheet, wherein the height of the end of the large silver electrode layer and the height of the small silver electrode layer are equal to the width of the mica sheet, a barrier layer is reserved between the large silver electrode layer and the small silver electrode layer, and insulating edges with equal width are reserved on two side edges of the mica sheet on the large silver electrode layer;
the adjacent mica silver sheets are staggered and laminated to carry out core group assembly according to the principle that the barrier layers are aligned and attached to each other, and the number of the assembled sheets is determined according to the capacity of the mica capacitor;
and end silver paste is coated on two ends of the capacitor core group and is used as a leading-out part after sintering.
The width of the end of the large silver electrode layer is consistent with that of the small silver electrode layer.
The end portions of adjacent mica silver flakes are completely filled or coated with a silver layer.
After the end of the mica capacitor core group is coated with end silver paste, the end surface, two side surfaces of the end, the upper silver electrode layer and the lower silver electrode layer are communicated, so that the end is led out in a three-dimensional manner.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model provides a mica capacitor improves through the electrode layer shape to on the mica sheet, highly prolongs the silver layer of end department to unanimous with the mica sheet width, and the end part of adjacent mica silver piece is filled or is coated by the silver layer completely for its end is complete monolithic structure after the sintering, has filled the internal blank of current mica capacitor terminal electrode leading-out part complete monolithic structure, three-dimensional. The utility model avoids the difficult problem that the actual capacity of the capacitor part product can not reach the required nominal capacity and the voltage resistance can be reduced or even directly loses efficacy from theory and actual operation; the utility model discloses can satisfy the silver electrode preparation of the mica condenser of whole monolithic structures, have advantages such as reasonable in design, convenient operation, zero cost increase, control are reliable, promotion wide range.
The utility model provides a mica capacitor with end in complete monolithic structure, through extending the height of silver layer end to be unanimous with the mica sheet width, under the circumstances of guaranteeing barrier layer width demand, the end of drawing forth is by the plane contact of original silver layer width x core group thickness, improves to the three-dimensional contact of mica sheet width x core group thickness x little silver layer width, has increased the area of contact when the termination electrode draws forth, has improved the reliability that the termination electrode draws forth completely greatly, has improved the hit rate of product capacity; the voltage change rate dv/dt resistance of the mica capacitor is improved, and the frequency shock resistance of the product is greatly improved.
The mica capacitor with the completely monolithic end increases the contact area when the end electrode is led out, so that the contact resistance of the product is reduced, the tan delta value is smaller, and the service frequency characteristic is more excellent; the contact of the terminal electrode is more reliable, and the resistance value is larger.
Adopt the utility model discloses afterwards, the statistical data through 10 ten thousand products of putting into production in batches at the production line show: not only the leading-out reliability of the core group is enhanced, but also the qualification rate of the finished product in the aspect of electrical parameters is obviously improved:
1. in the voltage resistance test of the core group, the voltage resistance qualification rate of the core group is improved to more than 95 percent from about 65 percent originally; the extraction is more reliable, and the qualified rate of the resistance of the product is correspondingly improved.
2. During capacity test, the capacity hit rate of the core group is improved to more than 94% from about 85% originally.
3. In the process of testing finished products, the loss qualification rate of the products is improved to more than 96 percent from about 90 percent.
4. In the screening process of finished products, the elimination rate of the products is reduced to below 2 percent from about 6 percent.
5. Due to the improvement of the leading-out reliability of the product, the voltage change rate dv/dt resistance of the product is obviously enhanced, and the frequency impact resistance of the product is greatly improved under the same use condition.
Drawings
Fig. 1-4 are schematic views of silver layer shapes of the present invention, wherein fig. 1-1 is a front view, and fig. 1-2 is a front and rear side view; FIGS. 1-3 are rear views; FIGS. 1-4 are left and right side views;
fig. 2-1 to 2-4 are schematic views illustrating the assembly of the core pack according to the present invention, wherein fig. 2-1 is a front view, and fig. 2-2 is a front and rear side view; FIGS. 2-3 are rear views; FIGS. 2-4 are left and right side views;
fig. 3-1 to fig. 3-4 are schematic end drawing views of the present invention, wherein fig. 3-1 is a front view, and fig. 3-2 is a front and rear side view; FIGS. 3-3 are rear views; fig. 3-4 are schematic cross-sectional views of tip extraction.
Fig. 4 is a schematic diagram of the silver layer contrast of the present invention (the white part is the silver layer), the left diagram is the silver layer shape schematic diagram of the present invention, and the right diagram is the silver layer shape schematic diagram before improvement.
Fig. 5-1-5-2 are schematic diagrams comparing the cross-section of the core pack end (white part is silver layer), the left diagram is schematic diagram of the cross-section of the end of the present invention, and the right diagram is schematic diagram of the cross-section of the end before improvement.
Wherein, 1 is a small silver electrode layer; 2 is a large silver electrode layer; 3 is an insulating edge; 4 is a barrier layer; and 5 is a leading-out terminal.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are intended to be illustrative, but not limiting, of the present invention.
When the mica capacitor is assembled by using the original silver electrode shape, a complete monolithic structure is not formed because interlayer gaps (the silver layer is only coated at partial height) exist at two sides of the end of the core group; thus, two extreme phenomena are easy to occur in the end silver coating process: when the flatness of the end face of the core group is poor, silver sheets lower than the end face cannot be dipped with silver paste of an upper end head, so that complete extraction is difficult to realize, and the actual capacity of individual products is smaller than the required nominal capacity; secondly, because interlayer gaps exist at two sides of the end of the core group, when the end is coated with silver, silver paste at the end is easy to permeate into the core group along a gap of about 10 mu m between mica silver sheets due to a siphon principle, so that a barrier layer or an insulating edge is narrowed, and the voltage resistance of a product is reduced or even directly loses efficacy; thirdly, the extraction effect of partial products is poor, so that the loss value is large; fourthly, endThe head contact is unreliable and the possibility of virtual contact exists, so that the resistance value of the product is less than 1 multiplied by 1010Ω。
Therefore, the utility model provides a mica capacitor with a completely monolithic end, which comprises a capacitor core group formed by sintering staggered and laminated mica silver sheets, wherein the end is of a completely monolithic structure; the mica silver sheet is characterized in that a large silver electrode layer and a small silver electrode layer are arranged on two sides of each mica sheet, wherein the height of the end of the large silver electrode layer and the height of the small silver electrode layer are equal to the width of the mica sheet, a barrier layer is reserved between the large silver electrode layer and the small silver electrode layer, and insulating edges with equal width are reserved on two side edges of the mica sheet on the large silver electrode layer;
the adjacent mica silver sheets are staggered and laminated to carry out core group assembly according to the principle that the barrier layers are aligned and attached to each other, and the number of the assembled sheets is determined according to the capacity of the mica capacitor;
and end silver paste is coated on two ends of the capacitor core group and is used as a leading-out part after sintering.
Further, the width of the end of the large silver electrode layer is consistent with that of the small silver electrode layer.
Further, the end portions of adjacent mica silver flakes are completely filled or coated with a silver layer.
Furthermore, after the end of the mica capacitor core group is coated with end silver paste, the end surface, two side surfaces of the end, the upper silver electrode layer and the lower silver electrode layer are communicated, so that the end is led out in a three-dimensional manner.
A preparation method of a mica capacitor with a complete monolithic structure at the end comprises the following operations:
1) cutting the mica sheet according to the required size, cleaning, and printing a large silver electrode layer and a small silver electrode layer on two sides of the mica sheet symmetrically through screen printing, wherein the heights of the two end parts are equal to the width of the mica sheet;
after the silver electrode layer is printed, transferring the mica silver sheet onto a heating flat plate, and drying at the temperature of 170-230 ℃ for 3-5 min;
2) spreading the dried mica silver sheet on a transmission mesh belt of a tunnel sintering furnace, and sintering the mica silver sheet while conveying the mica silver sheet from a furnace head at 400 ℃ to a furnace tail at 600 ℃, wherein the conveying/sintering time is 25-35 min;
3) when adjacent mica silver sheets are staggered and laminated, core group assembly is carried out according to the principle that the barrier layers are aligned and attached, and the number of the assembled sheets is determined according to the capacity required by the mica capacitor;
4) the assembled core group is as follows: sequentially loading the cushion block, the single-layer protective sheet, the core group, the double-layer protective sheet, the core group, the single-layer protective sheet and the cushion block into a sintering mold, applying pressure to tightly press the core group, then putting the core group, the core group and the core group into a high-temperature box furnace together, and completing core group sintering under the conditions of temperature preservation of 500-540 ℃ for 1 hour;
5) end silver coating: tightly attaching the adhesive plaster to the flat glass, and flatly smearing the silver paste at the end on the adhesive plaster by using a glass rod, wherein the thickness of the silver paste is about 0.5 mm; clamping the sintered core group, dipping the end downwards into end silver paste, airing and sintering, and repeating the operation for 1-2 times to finish silver coating of the two ends of the core group;
6) and (3) core group voltage resistance detection: under the rated voltage of 2 times, the core group is horizontally placed on the insulating plate, two detection heads are used for simultaneously touching two ends of the core group, and the time is delayed for 3-5 seconds; testing one by one, and rejecting flashover and breakdown voltage waste products;
7) and selecting corresponding lead-out wires, welding materials and welding modes according to the requirements of the mica capacitor for welding.
The utility model discloses an improvement based on carry out the silver layer shape of mica silver piece to the characteristic of core group, condenser is further improved:
as shown in fig. 1-1 to fig. 1-4, two large silver electrodes and two small silver electrodes are symmetrically printed on two sides of each mica sheet, the height of the two silver electrodes is consistent with the width of the mica sheet, and the width of the end of the large silver electrode layer is consistent with the width of the small silver electrode layer.
The height of the silver layer and the width of the mica sheet (l) at the two ends of the two silver electrode layers1) Forming the core group of the capacitor by staggered and laminated assembly, and forming two ends of the product after pressing and sinteringThe whole monolithic structure realizes the three-dimensional drawing-out part of the end head. The contact area led out by the terminal electrode is increased, so that the terminal electrode is led out more reliably and the capacity hit rate is high; meanwhile, the contact resistance of the product is reduced, the tan delta value is smaller, and the use frequency characteristic is better; the end lead-out is more reliable, the possibility of virtual contact is avoided, and the resistance value of the product is larger than 1 multiplied by 1010Ω。
The utility model discloses got rid of and scribbled the inside possibility of silver-colored end silver thick liquid infiltration core group of silver-colored in-process (refer to the left side of figure 4 and the left side of figure 5-1, figure 5-2), eliminated the production of product withstand voltage defective work completely. The capacity of resisting the voltage change rate dv/dt of the product is also improved, the frequency impact resistance of the product is improved, and the aging impact resistance of the product in the use process is enhanced.
Specific examples are given below.
Referring to fig. 1-1 to 1-4, the total length of the large and small electrodes of the present invention is consistent with the length of the mica sheet; height of the small silver electrode layer 1 and width of the mica sheet (l)1) The consistency is achieved; at the end of the large silver electrode layer 2, the same width portion (l) as the small silver electrode layer2) Height (l) of1) Width of mica sheet (l)1) The consistency is achieved; the width of the insulating edge 3 and the barrier layer 4 is set by the voltage rating of the mica capacitor.
The utility model discloses a preparation method of mica condenser with end being complete monolithic structure, including following operation:
1) cutting the mica sheet according to the required size, cleaning, and printing a large silver electrode layer and a small silver electrode layer on two sides of the mica sheet symmetrically through screen printing, wherein the heights of the two end parts are equal to the width of the mica sheet; after the electrode layer is printed, transferring the mica silver sheet onto a heating flat plate, and drying at the temperature of 170-230 ℃ for 3-5 min;
2) spreading the dried mica silver sheet on a transmission mesh belt of a tunnel sintering furnace, conveying the mica silver sheet from a furnace head at 400 ℃ to a furnace tail at 600 ℃ for about 30min to finish the sintering of the mica silver sheet;
3) core group assembly is carried out according to the principle that barrier layers are aligned and attached when adjacent mica sheets are assembled in a staggered and laminated mode, and the number of the assembled sheets is determined according to the required capacity;
4) the assembled core group is as follows: sequentially loading the cushion block, the single-layer protective sheet, the core group, the double-layer protective sheet, the core group, the single-layer protective sheet and the cushion block into a sintering mold, applying pressure to tightly press the core group, then putting the core group, the core group and the core group into a high-temperature box furnace together, and completing core group sintering under the conditions of temperature preservation of 500-540 ℃ for 1 hour;
5) end silver coating: clinging the medical adhesive plaster to the flat glass, and flatly smearing the silver paste on the adhesive plaster by using a glass rod to obtain a thickness of about 0.5 mm; clamping a sintered core group by using a pair of tweezers, dipping the end downwards in end silver paste, drying and sintering, and repeating the operation for 1-2 times to finish silver coating on the end of the core group;
6) and (3) core group voltage resistance detection: setting the indicating value of a voltmeter according to 2 times of rated voltage, horizontally placing the core group on an insulating plate, simultaneously touching two ends of the core group by using two detection heads, and delaying for 3-5 seconds; testing one by one, and rejecting flashover and breakdown voltage waste products;
7) and (3) selecting corresponding lead-out wires, welding materials and welding modes according to the requirements of product specifications for welding: horizontally placing the core group on an adiabatic ground welding plate, clamping the outgoing line by using forceps with a left hand, dipping the scaling powder on the welding part, and horizontally pasting the core group on the welding part of the end socket of the core group; and (3) holding a 50W electric soldering iron reaching 340-380 ℃ by the right hand, dipping solder on the soldering iron head, pressing the solder tightly at the welding starting point of the outgoing line, and smoothing the solder rightwards to the welding end point to complete the welding of the outgoing line.
Two interlayer gaps with the thickness of about 10 micrometers exist on the upper side and the lower side of the original core group, when the end is coated with silver, due to the siphon principle, silver paste on the end easily permeates into the core group along the gap between the mica silver sheets, so that a barrier layer or an insulating edge is narrowed, and the voltage resistance of a product is reduced or even directly loses efficacy; when the flatness of the end of the core group is poor, silver sheets lower than the end face cannot be dipped in the silver paste of the end, the end face of the core group is difficult to be completely and completely led out, so that the actual capacity of individual products cannot reach the required nominal capacity; even if the capacity of the product reaches the standard, pressure-resistant waste products and loss waste products are easy to generate.
The end electrodes of the embodiment shown in fig. 2-1 to 2-4 can form a complete monolithic structure after the core assembly is sintered (shown in fig. 5-1 and the left diagram of fig. 5-2), thereby eliminating the possibility that the end silver paste penetrates into the core assembly during silver coating and completely eliminating the generation of voltage-resistant unqualified products of products. The leading-out part of the end is three-dimensional, the contact area during leading-out is obviously increased, the possibility and reliability of completely leading-out the end electrode are greatly enhanced, and the capacity hit rate and the voltage-resistant reliability of the product are obviously improved.
As can be seen from the schematic illustration of the tip leading-out effect in fig. 3-1 to 3-4, the leading-out portion of the tip is three-dimensional after the tip electrode of the present embodiment has a completely monolithic structure. The contact area is obviously increased when the lead-out is carried out, so that the contact resistance of the product is reduced, the tan delta value is smaller, and the use frequency characteristic is better; the end lead-out is more reliable, the possibility of virtual contact is avoided, and the resistance value of the product is larger than 1 multiplied by 1010Omega; the voltage change rate dv/dt resistance of the product is improved, and the frequency shock resistance of the product is greatly improved.
Adopt the utility model discloses afterwards, the statistical data through 10 ten thousand products of putting into production in batches at the production line show: not only the leading-out reliability of the core group is enhanced, but also the qualification rate of the finished product in the aspect of electrical parameters is obviously improved:
1. in the voltage resistance test of the core group, the voltage resistance qualification rate of the core group is improved to more than 95 percent from about 65 percent originally; the extraction is more reliable, and the qualified rate of the resistance of the product is correspondingly improved.
2. During capacity test, the capacity hit rate of the core group is improved to more than 94% from about 85% originally.
3. In the process of testing finished products, the loss qualification rate of the products is improved to more than 96 percent from about 90 percent.
4. In the screening process of finished products, the elimination rate of the products is reduced to below 2 percent from about 6 percent.
5. Due to the improvement of the leading-out reliability of the product, the voltage change rate dv/dt resistance of the product is obviously enhanced, and the frequency impact resistance of the product is greatly improved under the same use condition.
The embodiments given above are preferred examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical features of the technical solution of the present invention by those skilled in the art all belong to the protection scope of the present invention.
Claims (4)
1. A mica capacitor with a complete monolithic structure at the end is characterized by comprising a capacitor core group formed by sintering staggered and laminated mica silver sheets, wherein the end is of a complete monolithic structure; the mica silver sheet is characterized in that a large silver electrode layer and a small silver electrode layer are arranged on two sides of each mica sheet, wherein the height of the end of the large silver electrode layer and the height of the small silver electrode layer are equal to the width of the mica sheet, a barrier layer is reserved between the large silver electrode layer and the small silver electrode layer, and insulating edges with equal width are reserved on two side edges of the mica sheet on the large silver electrode layer;
the adjacent mica silver sheets are staggered and laminated to carry out core group assembly according to the principle that the barrier layers are aligned and attached to each other;
and end silver paste is coated on two ends of the capacitor core group and is used as a leading-out part after sintering.
2. A mica capacitor terminated in a completely monolithic structure according to claim 1, wherein the width at the termination of the large silver electrode layer corresponds to the width of the small silver electrode layer.
3. A mica capacitor having a fully monolithic structure terminated as in claim 1 wherein the terminal portions of adjacent mica silver flakes are completely filled or coated with a silver layer.
4. The mica capacitor with the completely monolithic structure at the end as claimed in claim 1 or 3, wherein the end face, two side faces of the end, and the upper and lower silver electrode layers of the end of the mica capacitor core group are communicated after being coated with end silver paste, thereby realizing the three-dimensional lead-out of the end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120347162.8U CN214123713U (en) | 2021-02-07 | 2021-02-07 | Mica capacitor with end of complete monolithic structure |
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| CN202120347162.8U CN214123713U (en) | 2021-02-07 | 2021-02-07 | Mica capacitor with end of complete monolithic structure |
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| CN214123713U true CN214123713U (en) | 2021-09-03 |
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