TWI270089B - Method for manufacturing varistor with phosphate insulation layer - Google Patents

Abstract

The present invention relates to a method for manufacturing a varistor with phosphate insulation layer and a structure thereof, wherein an insulation layer is formed on a surface of a body of the varistor except the areas where terminal electrodes of the varistor are arranged. The insulation layer serves to prevent metal ions of electroplating solution from attaching to the varistor body so as to protect the varistor body, except the terminal electrodes, from being electroplated. Since the insulation layer does not cause direct corrosive reaction with the varistor body, the surface of the varistor body can maintain even and flat, and electroplating at of the areas where non terminal electrodes of the varistor are located can be effectively avoided, whereby yield of the manufacturing process for varistors can be raised.

Description

1270089 V. Description of invention (f) This is a method for producing a varistor with a scale insulation layer. In particular, the species can be avoided. (4) The non-terminal electrode position of the body is controlled by the electric shovel during the process, and can also be maintained. Varistor surface varistor manufacturer

λ has & U k 'the step of plating the varistor terminal electrode is the latter stage I.' In order to avoid the varistor body and the terminal electrode being electroplated at the same time, each manufacturer has introduced various protection processes or devices to prevent the resistance from crying. The body is plated to solve the problem of low process yield. The technique disclosed in U.S. Patent No. 4,140, 551, the use of squamous acid j and its composition ' reacts with a metal substance to form a protective film, so that it is limited in the application of the dry circumference. Also, 'European Patent Publication No. _678 No. W, No. 716429, A3, and US Patent No. 5'614'074, No. 5, 757, 263, which mainly utilizes the reaction of phosphoric acid with a ceramic body of a varistor. In order to form a zinc-zinc insulating layer on the surface of the material of the varistor, it is necessary to follow-up electricity. The disadvantage of this process method is that the varistor reacts with phosphoric acid to form a trace of rot on the surface of the resistor. During operation, the surface of the varistor will still be plated with a metal layer, so it does not have a complete insulation effect. The surface of the varistor will obviously form a surface of the smear, and there is still a defect in the way of making a varistor. The process method disclosed in U.S. Patent No. 6,214,685 discloses the use of zinc phosphate deposited on the surface of the ceramic body to form an insulating layer on the surface of the ceramic body, so that the varistor body can be protected for subsequent subsequent plating operations. Phosphoric acid is deposited on the surface of the ceramic body, and is not applicable to the Chinese National Standard (CNs) w specification (2)

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1270089 A7 B7 V. INSTRUCTIONS (>) 3 should be, therefore, the process method can improve the shortcomings of the aforementioned patents, that is, the surface of the surface can be kept flat, but it is easy to plate the metal on the varistor and the prosthesis when electroplating is performed. It is also impossible to achieve the effect of complete insulation. It can be seen from the above that the current electric ore operation in the process of manufacturing a varistor cannot simultaneously take into account that the varistor body is completely uncharged by electric ore, and maintains the complete shape of the varistor. The varistor is a passive and passive 70 piece for various electronic circuits. Production quality and yield are highly valued, so more effective solutions should be proposed for the aforementioned shortcomings. To this end, the main object of the present invention is to provide a varistor that can surely isolate the varistor body and the terminal electrode during the electric ore process, and only allows the terminal electrode to receive electricity, and can maintain the smoothness of the varistor appearance after the operation is completed. To greatly increase the yield of varistor production. The main technical means used to achieve the above purpose is that the foregoing manufacturing method comprises the following steps: a step of depositing a phosphate precipitate, that is, first maintaining a phosphate solution at a high temperature to form a supersaturated solution to precipitate a phosphate precipitate. And depositing the phosphate precipitate on the surface of the varistor body; a step of heating the phosphate precipitate, that is, heating the phosphate precipitate covering the surface of the varistor body until it reaches a molten state, and then forming a uniform and structurally transparent transparent insulating layer having the property of being not corroded by the plating solution; a step of plating the end electrode, since the varistor is covered by the insulating layer, only the terminal electrode is exposed, so that the key operation can be continued The above process method is mainly to protect the varistor body at the terminal electrode for the standard of the paper. The Chinese National Standard (CNS) A4^i7iI^; 2^ 公爱------- Line · (Please read the note on the back and fill in this page) 1270089 A7 B7 V. Invention Description (The temple makes the surface of the 5H varistor body formed - not corroded by the plating solution, 邑The layer is used to surely isolate the varistor body from the plating solution, so that the varistor is turned into a metal 35' and can maintain the varistor body after the end of the operation of the electric clock, and still has a replacement of the outer edge of the ice sheet. The surface of the varistor body can be not plated with a metal layer; 蕤 制 amp amp 错 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT: (a) Drawings: FIG. AD is a cross-sectional view of a first preferred embodiment of the present invention, showing steps of a process flow. A second preferred embodiment of the present invention A cross-sectional view showing a process flow. A cross-sectional view of a third preferred embodiment of the present invention, showing a process flow. A cross-sectional view of a fourth preferred embodiment of the present invention, showing a process Steps of the process.

Figure II~E

Third picture A~F

Fourth Figure A~E (1〇)~(l〇c) Varistor (111) Ceramic Layer (1 2 ) Terminal Electrode (14) Insulation Layer (16) Hui Tin Layer This creation system is (1 1) varistor body ( 1 1 2) Metal layer (1 3) Phosphate compound (1 5) Underplating layer (17) Organic material layered salt layer insulating layer varistor method and its seeding with phosphorus

------------ΛΚ-------^定--------Line· (Please read the notes on the back and fill out this page) 1270089 V. Invention Description (The insulating layer is used to isolate the varistor body and the terminal electrode so that the varistor body is not subjected to electroplating, thereby improving the fabrication yield; and the present invention is: the varistor (10), as shown in the first figure, The varistor body Q 1 )' is composed of a metal oxide mainly composed of oxidized words, and a terminal electrode (12) is disposed at both ends of the varistor body and (n) _, wherein the zinc oxide can be conventionally sintered by ceramics. Technology, such as adding glue, pulping, drying, green forming, drying, printing, laminating, pellet forming, debinding, etc. = adding other metal oxides as additives, such as manganese oxide, nickel oxide, #化钴等; "milk and the metal oxide can also be formed by the use of organic or inorganic salts, such as carbonate or oxalate, by the conventional ceramic materials, high temperature burning molding technology; and the terminal electrode The material f of (i 2) is mainly composed of metallic silver, and it is possible to appropriately add #, Zhao and other precious gold 4' and may contain an appropriate amount of broken glass, and The method of forming the terminal electrode (1 2 ) made of a metal material such as a sinusoidal material is formed by printing, dip coating, roll coating, spray coating or sintering; in addition, the appearance of the varistor is not limited, and may be a disc shape, Square, rectangular, cylindrical, hollow disc-shaped or hollow-cylindrical, etc., and the process of changing the process of crying can be achieved by the practice of prayer molding or lamination or other conventional techniques. b - First, please refer to the first figure A to D are a preferred embodiment of the present invention, wherein the process method comprises the steps of: - depositing a salt compound (13) step, that is, first maintaining the sulphate solution at a high temperature to form - Supersaturated solution to precipitate phosphate precipitates, and then deposit the phosphate precipitate on the body of the varistor (丄丄). This paper scale applies to the Chinese National Standard (CNS) A4 specification (210 297 297 mm) --- ---.------- (Please read the note on the back and then fill out this page) «1 ϋ n ** Order ------- 1270089 A7 B7 V. Description of the invention (on; a heating The acid salt compound 卩 1 ^ the whipping substance (1 3 ) step, that is, covering the varistor On the surface of the body (1 1 ), the acid compound (i 3) is added to the surface, and the layer is uniformly formed and the structure is firm and transparent (14) 'The insulating layer (14) has Not heated by the plating solution, the temperature in the present embodiment can be 50 CTC-75 ° C, and the heating time is about 5 - 30 minutes; a plated electrode (1 2) In the step, since the varistor body (丄;) is covered by the insulating layer (14), only the terminal electrode (Η) is exposed, so that the electric power operation can be performed; in this embodiment, the electric boat system includes a bottom mine and - solder layer (16), and the plating operation can be performed by barrel plating '7 amps for 80 minutes to form a bottom plating layer (such as nickel or copper), then 7 amps for 80 minutes, in the bottom plating layer ( 1 = solder layer (16) 'This completes the plating terminal electrode work; in addition, the plating terminal electrode (1 2) can be performed by brush plating or electroless plating. Referring to FIG. 2 to FIG. 2 again, another preferred embodiment of the present invention is the same as the previous steps. However, in the last step, the step of removing the insulating layer (14) is added (for example, the second figure). E shows) that the insulating layer (丄4) is removed by rhyme or mineral acid to reproduce the surface of the varistor body of the variable resistance a). σ (1 ϋ - Ming, see also the second embodiment A to F, is a third preferred embodiment of the present invention / is the step of receiving the second embodiment, that is, after the step of removing the insulating layer (14) Add a surface to form an organic coating film (1 7) (such as (210 x 297 mm). The surface of the paper scale is covered with 1270089). The surface of a varistor with a b) has a more appearance. The appearance of the varistor is more A7. (Which) Figure III is not in the varistor body (machine coating film (1 7), used to protect the surface of the varistor body (1 1 ); thereby making the varistor, perfect 'the organic coating film (1 7 ) can be a sub-diacid, vinegar polymer, epoxy vinegar polymer or other can be used as ^=&, polymer' and other insoluble powders and appropriate additives ° organic concentration, please refer to The figure is shown in the figure, which is an embodiment, and the process of the preceding stage is the same as that of the first embodiment. The step of forming an organic coating film (1 7) is as follows (as shown in the fourth figure). a varistor body having an insulating layer (14) (work re-forming - organic coating film (17), whereby the 〇c can be made) The step of removing the insulating layer (14) is omitted. As can be seen from the above, the present invention forms an insulating layer which is not bonded by the surface of the varistor body, so that the surface of the varistor body is not plated with a metal layer and the surface of the flat ship can be maintained. And i (four) or electroplating (four) heart causes a rugged surface, and affects the appearance 'Yes, the present invention ensures that the varistor is greatly improved in the manufacture after plating. Therefore, the design of the present invention meets the requirements of the invention patent, Make an application. This paper scale wipes off the home standard (CNS) A4^

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Claims (1)

A8 B8 C8 D8 1270089 ", the scope of patent application 1, a varistor manufacturing method with a phosphate insulating layer, wherein the varistor body of the varistor is composed of a metal oxide composed mainly of zinc oxide, and is disposed at both ends of the varistor body. An end electrode is provided, the method comprises: a step of depositing a phosphate, that is, first maintaining a phosphate solution at a high temperature to form a supersaturated solution to precipitate a phosphate and depositing the acid salt on the surface of the varistor body; Heating the sulphate step, that is, heating the phosphate covering the surface of the varistor body until it reaches a molten state, thereby forming a uniform and structurally transparent transparent insulating layer; an electro-mineral end electrode step 'due to the varistor The system is covered by the insulating layer, and only the terminal electrode is exposed, so that the plating operation can be continued; since the varistor is placed in the plating solution, since the surface is formed with an insulating layer which is not corroded by the electric ore, the varistor body can be eliminated at the end. When the electrode is electroplated, it is plated or destroyed. 2. As shown in the first paragraph of the patent application, the phosphate is absolutely The varistor manufacturing method of the layer further performs a step of removing the insulating layer after the step of the electrode terminal electrode, that is, the surface of the varistor body is reproduced. 3. The varistor method with a phosphate insulating layer as described in claim 2 is removed. After the step of insulating layer, a step of forming an organic coating film is further performed, that is, coating an organic coating film on the surface of the varistor body to protect the varistor body. 4. The scaly salt insulation as described in claim 1 The layer varistor method is further processed after the electroplating terminal electrode step to form an organic paper scale applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 6. Applying for the patent scope, ', , and V, the coating layer on the surface of the varistor body is directly coated with an organic coating film to protect the varistor body. [5] The method of manufacturing a varistor having a phosphorous-bismuth salt insulating layer according to claim 1, 2, 3 or 4, wherein the metal surface of the terminal electrode is at least a bottom clock layer and at least from the inside to the outside. - Solder layer. ^6. The k-resistance of the phosphate insulating layer described in claim 5 of the patent application is made by the method of electroless plating, brush plating or barrel plating. X 7. A method of producing a varistor having a phosphate insulating layer as described in claim 2, 2, 3 or 4, wherein the phosphate solution comprises a phosphate, a zinc ion, a mineral acid radical, and a metal ion. 8. A method of making a varistor having a phosphate insulating layer as described in claim 2, 2, 3 or 4, wherein the varistor is zinc oxide and then added to other metal oxides as an additive. 9. For the varistor method with phosphate insulation layer as described in item 8 of the patent application, the metal oxide may be metal organic salt or metal inorganic salt. 10 This paper scale is applicable to China National Standard (CNS) A4 specification (210 X 297). MM)