CN1434464A - Varistor with phosphate insulation layer and making method thereof - Google Patents
Varistor with phosphate insulation layer and making method thereof Download PDFInfo
- Publication number
- CN1434464A CN1434464A CN 02102474 CN02102474A CN1434464A CN 1434464 A CN1434464 A CN 1434464A CN 02102474 CN02102474 CN 02102474 CN 02102474 A CN02102474 A CN 02102474A CN 1434464 A CN1434464 A CN 1434464A
- Authority
- CN
- China
- Prior art keywords
- rheostat
- phosphate
- tool
- insulation layer
- termination electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Thermistors And Varistors (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
A varistor with phoshpate insulation layer and its process method is to form an insulation layer on the varistor surface except end electrode zones. Since the said insulating layer can prvent metal ions of plating solution from addering to it, the varistor can be protected from plating except terminal electrodes and keeps itself smooth on the surface since it doesn't generate corrosivity reaction directly with the said insulation layer, at the same time, non-terminal electrode will not be plated to increase the efficiency of varistor prosess.
Description
Technical field
The invention relates to a kind of rheostat and method for making thereof of tool phosphate insulation layer, refer to that especially a kind of non-termination electrode position of rheostat body of can avoiding is really electroplated in processing procedure, also can keep the rheostat manufacture method of rheostat surfacing simultaneously.
Background technology
In existing rheostat manufacturing process, the plating step of rheostat termination electrode is a back-end process, electroplated simultaneously for avoiding this rheostat body and termination electrode, so each relevant manufacturer is release one after another various protection processing procedures or device, solves the low excessively problem of process rate to prevent the rheostat body from being electroplated.
As the 4th, 140, No. 551 disclosed technology of patent of the U.S., use trbasic zinc phosphate and constituent thereof, can produce reaction with metal object and generate diaphragm, so restriction to some extent on the scope of application.
Again, European patent is announced A1 No. 0806780, B1, No. 0716429 B1, the A3 and the U.S. the 5th, 614, No. 074, the 5th, 757, No. 263 patents, it mainly utilizes phosphoric acid and rheostatic ceramic body action-reaction, to form the trbasic zinc phosphate insulating barrier in this rheostatic surface of ceramic body, to carry out follow-up electroplating activity, but the shortcoming of this manufacturing method thereof is to make rheostat and phosphatase reaction, form the vestige of corrosion on the rheostat surface, and when carrying out electroplating activity, this rheostat surface still can be coated with metal level, so it is the isolated completely effect of tool not, and have in appearance and form rugged surface significantly, therefore, still there is defective in the rheostatic mode of this making.
Moreover; announce the 6th in the U.S.; 214; the manufacturing method thereof that No. 685 patent disclosed is to utilize trbasic zinc phosphate to be deposited on surface of ceramic body; to form an insulating barrier in surface of ceramic body equally; so can protect the rheostat body to carry out follow-up electroplating activity smoothly; because trbasic zinc phosphate is deposited on surface of ceramic body; and do not produce reaction with ceramic body; so the processing procedure mode can be improved the aforementioned patent shortcoming, promptly this rheostat surface can keep smooth, when only electroplating; still plate metal on rheostatic surface easily, can't reach the effect of insulation fully equally.
From the above, make the electroplating activity in the rheostat processing procedure at present, still can't take into account the rheostat body is not simultaneously electroplated fully, and rheostatic complete profile after keeping electroplating, based on rheostat is passive device for various electronic circuit indispensability, and therefore, it makes quality and yield is very paid attention to, so, should further propose more effective solution at aforesaid shortcoming.
Summary of the invention
Main purpose of the present invention is to provide a kind of rheostat and method for making thereof of tool phosphate insulation layer, can allow rheostat in electroplating process, isolate rheostat body and termination electrode really, only make termination electrode accept electroplating activity, and after finishing, operation still can keep the smooth of rheostat outward appearance, thus, produce yield significantly to improve rheostat.
For achieving the above object, the rheostat method for making of a kind of tool phosphate insulation layer provided by the invention, wherein rheostatic rheostat body is one to be that the metal oxide that main composition is formed is formed by zinc oxide, and sets up a termination electrode separately in the two ends of rheostat body, and this method for making includes:
One sedimentary phosphor hydrochlorate step promptly earlier remains in phosphate solution formation one supersaturated solution high-temperature under, with the precipitation of phosphorus hydrochlorate, again with this phosphatoptosis on the rheostat body surface;
One heated phosphoric salt step promptly to being covered in the phosphate heating on the rheostat body surface, reaches the melting state until it, can form one deck evenly and the transparence insulating barrier of rugged construction;
One electroplates the termination electrode step, because the rheostat body is coated by this insulating barrier, only so termination electrode exposes the electroplating activity that can continue;
Because rheostat places electroplate liquid, because of its surface is formed with not by the insulating barrier of electroplate liquid etching characteristic, is subjected to its plating or destroys its surface when termination electrode is electroplated so can exempt the rheostat body.
After electroplating the termination electrode step, further carry out the step of a removal insulating barrier, even the rheostat body surface reappears.
After the step of removing insulating barrier, further carry out one and form the organic coating film step, promptly in rheostat body surface coating one deck organic coating film, in order to protect this rheostat body.
Further carry out one and form the organic coating film step after electroplating the termination electrode step, promptly the insulating barrier to this rheostat body surface directly is coated with an organic coating film, to protect this rheostat body.
Wherein the metal surface of this termination electrode is to be at least one prime coat and at least one soldering-tin layer from the inside to the outside in regular turn.
The prime coat of this termination electrode and soldering-tin layer can be made by electroless plating, brush plating or tumble-plating process.
This phosphate solution includes phosphate radical, zinc ion, inorganic acid radical, metal ion.
This rheostat is that to add other metal oxides again be additive to zinc oxide.
This metal oxide is substituted by metal organic salt or metal inorganic salt.
The rheostat of a kind of tool phosphate insulation layer provided by the invention, it includes:
One rheostat, it comprises by zinc oxide is the rheostat body that main composition is formed, and two end electrodes, is arranged at the two ends of this rheostat body respectively;
One insulating barrier is a hyaline layer, and is formed at this rheostat body surface, and its Main Ingredients and Appearance is a phosphate, has the characteristic that is not subjected to the electroplate liquid corrosion, does not electroplate a metal level with protection rheostat body surface.
Form an organic coating film on this insulating barrier again.
Each termination electrode metal surface is electroplate with at least one prime coat and at least one soldering-tin layer from the inside to the outside.
This organic coating film can be used as the organic polymer of protective layer by Ya Keli acid polymer, polyester polymers, epoxy resin polymer or other, and the composition that contains other insoluble powder and an amount of additive.
This prime coat is nickel or copper.
Description of drawings
For further understanding concrete design and other purposes of the present invention, be described in detail below with accompanying drawing, wherein:
Figure 1A-D: be the profile of first preferred embodiment of the present invention, shown the step of processing flow.
Fig. 2 A-E: be the profile of second preferred embodiment of the present invention, shown the step of processing flow.
Fig. 3 A-F: be the profile of the 3rd preferred embodiment of the present invention, shown the step of processing flow.
Fig. 4 A-E: be the profile of the 4th preferred embodiment of the present invention, shown the step of processing flow.
Embodiment
The present invention is a kind of rheostat and method for making thereof of tool phosphate insulation layer, and it mainly utilizes isolated rheostat body of this insulating barrier and termination electrode, is not electroplated to make this rheostat body, improves thus and makes yield; And the rheostat that the present invention was suitable for (10), as shown in Figure 1, its rheostat body (11) is one to be that main metal oxide is formed by zinc oxide, and set up a termination electrode (12) separately in the two ends of rheostat body (11), wherein this zinc oxide can known ceramic post sintering forming technique, as through add glue, slurrying, the universe dry, give birth to embryo forming, the universe dry, print, laminate, to add other metal oxides again be additive to processing procedures such as grain forming, binder removal, sintering, as manganese oxide, nickel oxide, cobalt oxide etc.;
This metal oxide also can use the mode of organic salt or inorganic salts to make again, as carbonate or oxalates etc., through ceramic material high temperature sintering forming technique moulding commonly used; And the material of termination electrode (12) is based on argent, wherein can suitably add precious metals such as platinum, palladium, and can contain an amount of nature of glass, and with the manufacture method that these metal materials are made termination electrode (12) can be printing, be stained be coated with, the mode moulding or the sinter molding of roller coating, spraying;
In addition, this rheostatic outward appearance is unrestricted, can be disc, square, rectangle, cylindrical, hollow disc shape or hollow cylindrical etc., and rheostatic processing procedure form can be the mode that moldings formed therefrom or lamination mode or other common technologies can be reached.
At first see also shown in Figure 1A-D, be a preferred embodiment of the present invention, wherein this manufacturing method thereof comprises following step:
One sedimentary phosphor phosphate compounds (13) step promptly remains in phosphate solution earlier and forms a supersaturated solution under the high-temperature, with precipitation of phosphorus hydrochlorate sediment, this calcium phosphate precipitation thing is deposited on rheostat body (11) surface again;
One heated phosphoric salt compound (13) step, promptly to being covered in the lip-deep phosphate compounds of rheostat body (11) (13) heating, reach the melting state until it, can form one deck evenly and the transparence insulating barrier (14) of rugged construction, this insulating barrier (14) has the characteristic of not corroded by electroplate liquid; Heating-up temperature can be 500 ℃-750 ℃ in present embodiment, and is about 5-30 minute heating time;
One electroplates termination electrode (12) step, because rheostat body (11) is coated by this insulating barrier (14), only so termination electrode (12) exposes the electroplating activity that can continue; This plating includes a prime coat (15) and a soldering-tin layer (16) in present embodiment, and electroplating activity can utilize tumble-plating process, impose 7 amperes earlier and termination electrode formed a prime coat (15) in 80 minutes, as nickel or copper, again with 7 amperes 80 minutes, form a soldering-tin layer (16) in prime coat (15) surface, so far finish and electroplate termination electrode (12) operation; In addition can also brush plating method or the operation of electroless plating method execution plating termination electrode (12).
See also again shown in Fig. 2 A-E, be another preferred embodiment of the present invention, its leading portion step is all identical, only be added to one again and remove insulating barrier (14) step (shown in Fig. 2 E) in last step, it is removed this insulating barrier (14) with organic acid or inorganic acid, and the rheostat body surface of this rheostat (10a) is reappeared.
Please consult shown in Fig. 3 A-F again, be the 3rd preferred embodiment of the present invention, it accepts the step of second embodiment, promptly after removing insulating barrier (14) step, increase by one again and form organic coating film (17) step (shown in Fig. 3 F), in surface coated one organic coating film (17) of rheostat body (11), in order to rheostat body (11) surface of protection rheostat (10b); Thus so that the outward appearance of rheostat (10b) is more perfect; wherein this organic coating film (17) can be Ya Keli acid polymer, polyester polymers; epoxy resin polymer or other can be used as the organic polymer of protective layer, and the composition that contains other insoluble powder and an amount of additive.
And see also shown in Fig. 4 A-E, be the 4th preferred embodiment of the present invention, its FEOL step is identical with first embodiment, only increase by one at last again and form organic coating film (17) step (shown in Fig. 4 E) in processing procedure, promptly form an organic coating film (17) again in rheostat body (11) surface of tool insulating barrier (14), thus, make this rheostat (10c) and can directly save the step of removing insulating barrier (14).
From the above, the present invention is formed the insulating barrier that not corroded by electroplate liquid by the rheostat body surface, make the rheostat body surface not electroplated metal layer also can keep the surface planarization, not because of causing rugged surface with insulating barrier or electroplate liquid effect, and influence outward appearance, like this, the present invention guarantees rheostat when making, and significantly improves the yield after electroplating.
Claims (14)
1, a kind of rheostat method for making of tool phosphate insulation layer, wherein rheostatic rheostat body are one to be that the metal oxide that main composition is formed is formed by zinc oxide, and set up a termination electrode separately in the two ends of rheostat body, and this method for making includes:
One sedimentary phosphor hydrochlorate step promptly earlier remains in phosphate solution formation one supersaturated solution high-temperature under, with the precipitation of phosphorus hydrochlorate, again with this phosphatoptosis on the rheostat body surface;
One heated phosphoric salt step promptly to being covered in the phosphate heating on the rheostat body surface, reaches the melting state until it, can form one deck evenly and the transparence insulating barrier of rugged construction;
One electroplates the termination electrode step, because the rheostat body is coated by this insulating barrier, only so termination electrode exposes the electroplating activity that can continue;
Because rheostat places electroplate liquid, because of its surface is formed with not by the insulating barrier of electroplate liquid etching characteristic, is subjected to its plating or destroys its surface when termination electrode is electroplated so can exempt the rheostat body.
2, the rheostat method for making of tool phosphate insulation layer as claimed in claim 1 is characterized in that, further carries out the step of a removal insulating barrier after electroplating the termination electrode step, even the rheostat body surface reappears.
3, the rheostat method for making of tool phosphate insulation layer as claimed in claim 2; it is characterized in that; after the step of removing insulating barrier, further carry out one and form the organic coating film step, promptly in rheostat body surface coating one deck organic coating film, in order to protect this rheostat body.
4, the rheostat method for making of tool phosphate insulation layer as claimed in claim 1; it is characterized in that; further carry out one and form the organic coating film step after electroplating the termination electrode step, promptly the insulating barrier to this rheostat body surface directly is coated with an organic coating film, to protect this rheostat body.
As the rheostat method for making of claim 1,2,3 or 4 described tool phosphate insulation layers, it is characterized in that 5, wherein the metal surface of this termination electrode is to be at least one prime coat and at least one soldering-tin layer from the inside to the outside in regular turn.
6, the rheostat method for making of tool phosphate insulation layer as claimed in claim 5 is characterized in that, the prime coat of this termination electrode and soldering-tin layer can be made by electroless plating, brush plating or tumble-plating process.
7, as the rheostat method for making of claim 1,2,3 or 4 described tool phosphate insulation layers, it is characterized in that this phosphate solution includes phosphate radical, zinc ion, inorganic acid radical, metal ion.
As the rheostat method for making of claim 1,2,3 or 4 described tool phosphate insulation layers, it is characterized in that 8, this rheostat is that to add other metal oxides again be additive to zinc oxide.
9, the rheostat method for making of tool phosphate insulation layer as claimed in claim 8 is characterized in that, this metal oxide is substituted by metal organic salt or metal inorganic salt.
10, a kind of rheostat of tool phosphate insulation layer, it includes:
One rheostat, it comprises by zinc oxide is the rheostat body that main composition is formed, and two end electrodes, is arranged at the two ends of this rheostat body respectively;
One insulating barrier is a hyaline layer, and is formed at this rheostat body surface, and its Main Ingredients and Appearance is a phosphate, has the characteristic that is not subjected to the electroplate liquid corrosion, does not electroplate a metal level with protection rheostat body surface.
11, the rheostat of tool phosphate insulation layer as claimed in claim 10 is characterized in that, forms an organic coating film on this insulating barrier again.
As the rheostat of claim 10 or 11 described tool phosphate insulation layers, it is characterized in that 12, each termination electrode metal surface is electroplate with at least one prime coat and at least one soldering-tin layer from the inside to the outside.
13, the rheostat of tool phosphate insulation layer as claimed in claim 11; it is characterized in that; this organic coating film can be used as the organic polymer of protective layer by Ya Keli acid polymer, polyester polymers, epoxy resin polymer or other, and the composition that contains other insoluble powder and an amount of additive.
14, the rheostat of tool phosphate insulation layer as claimed in claim 12 is characterized in that, this prime coat is nickel or copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02102474 CN1226756C (en) | 2002-01-22 | 2002-01-22 | Varistor with phosphate insulation layer and making method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02102474 CN1226756C (en) | 2002-01-22 | 2002-01-22 | Varistor with phosphate insulation layer and making method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1434464A true CN1434464A (en) | 2003-08-06 |
| CN1226756C CN1226756C (en) | 2005-11-09 |
Family
ID=27627574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02102474 Expired - Fee Related CN1226756C (en) | 2002-01-22 | 2002-01-22 | Varistor with phosphate insulation layer and making method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1226756C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101350238B (en) * | 2007-07-16 | 2010-12-08 | 深圳振华富电子有限公司 | Method for processing surface of stacking slice type electronic element |
| WO2016019723A1 (en) * | 2014-08-08 | 2016-02-11 | Dongguan Littelfuse Electronics, Co., Ltd | Varistor having multilayer coating and fabrication method |
| CN112837877A (en) * | 2020-12-24 | 2021-05-25 | 南阳金铭电子科技有限公司 | Surface packaging treatment process for chip passive component |
| CN113363029A (en) * | 2020-03-06 | 2021-09-07 | 立昌先进科技股份有限公司 | Electronic component packaging structure and manufacturing method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020018651A1 (en) | 2018-07-18 | 2020-01-23 | Avx Corporation | Varistor passivation layer and method of making the same |
-
2002
- 2002-01-22 CN CN 02102474 patent/CN1226756C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101350238B (en) * | 2007-07-16 | 2010-12-08 | 深圳振华富电子有限公司 | Method for processing surface of stacking slice type electronic element |
| WO2016019723A1 (en) * | 2014-08-08 | 2016-02-11 | Dongguan Littelfuse Electronics, Co., Ltd | Varistor having multilayer coating and fabrication method |
| US10446299B2 (en) | 2014-08-08 | 2019-10-15 | Dongguan Littelfuse Electronics Company Limited | Varistor having multilayer coating and fabrication method |
| CN113363029A (en) * | 2020-03-06 | 2021-09-07 | 立昌先进科技股份有限公司 | Electronic component packaging structure and manufacturing method thereof |
| CN112837877A (en) * | 2020-12-24 | 2021-05-25 | 南阳金铭电子科技有限公司 | Surface packaging treatment process for chip passive component |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1226756C (en) | 2005-11-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7341639B2 (en) | Electroceramic component comprising a plurality of contact surfaces | |
| CN1565149A (en) | Nickel coated copper as electrodes for embedded passive devices | |
| CN1212025A (en) | Method of applying conductive coating | |
| JP2021515408A (en) | Multilayer ceramic capacitors with ultra-wideband performance | |
| CA2558237A1 (en) | Methods for forming an electrodeposited coating over a coated substrate and articles made thereby | |
| TWI845602B (en) | Multilayer ceramic capacitor having ultra-broadband performance | |
| CN100481279C (en) | Multiple field sheet type piezoresistor and producing method thereof | |
| KR20070099828A (en) | Manufacturing process of a capacitor embedded in pcb | |
| EP0969481A1 (en) | Phosphate coating for varistor and method | |
| CN101550029A (en) | A graphite electrode functional ceramic device and its preparation method | |
| CN1226756C (en) | Varistor with phosphate insulation layer and making method thereof | |
| CN1217958A (en) | Process for making cores for casting process | |
| US6577218B2 (en) | Electronic component and method of manufacturing same | |
| US20190131067A1 (en) | Multilayer Electronic Device having Improved Connectivity and Method for Making the Same | |
| CN1329183A (en) | Electrode with high-adhesiveness surface catalytic layer | |
| KR20070110094A (en) | Method for oxide dielectric layer formation, and capacitor layer forming material comprising oxide dielectric layer formed by said formation method | |
| CN1653566A (en) | High energy density capacitors | |
| US20160268610A1 (en) | Multi-Layer Coating System for Corrosion Protection of Magnesium Cylinder Block Against Coolant | |
| US6855408B2 (en) | Composite metal material and method for manufacturing the same, etched metal material and method for manufacturing the same and electrolytic capacitor | |
| EP1820882A1 (en) | Self-healing layer on non-ferrous metals using polyoxometalates | |
| CN1352870A (en) | Composition and method for manufacturing integral resistor in printed circuit boards | |
| CN101789294A (en) | Electronic component and manufacturing method thereof | |
| KR20060086576A (en) | Method for making semiconductor ceramic chip array | |
| JP2023551592A (en) | Multilayer ceramic capacitor with ultra-wideband performance | |
| CN1601778A (en) | Mfg method microfilm thermoelectric cell |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051109 Termination date: 20120122 |