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Ring varistor and its preparation method

A varistor, ring technology, applied in resistors, resistance manufacturing, non-adjustable metal resistors, etc., can solve the problem that the mechanical strength of the ring varistor cannot meet the actual needs, and the mechanical strength of the ring varistor is resistant to bending. Strength reduction and other problems, to achieve the effect of improving mechanical strength and simple operation

Active Publication Date: 2016-03-02
GUANGZHOU MAGNET ELECTRICITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As the ring varistor develops towards miniaturization, its thickness becomes thinner and its outer diameter becomes smaller and smaller, which will inevitably lead to a significant decrease in the mechanical strength (such as flexural strength) of the ring varistor.
In addition, the application field of ring varistors is also developing in the direction of automatic welding, which requires higher mechanical strength. test sorting) the mechanical strength of the prepared ring varistor can no longer meet the actual demand

Method used

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  • Ring varistor and its preparation method
  • Ring varistor and its preparation method
  • Ring varistor and its preparation method

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0038] According to the first embodiment of the present invention, the preparation method of the ring varistor includes the following steps:

[0039] Step 1. Mix zinc oxide, cobalt oxide, manganese carbonate and silicon dioxide in a molar ratio of 95:3:1.5:0.5, and dry the powder after spray drying to prepare the annular varistor Porcelain blank;

[0040] Step 2. Debinding the porcelain blank prepared in step 1 at 600°C;

[0041] Step 3. Sintering the debinding porcelain body prepared in step 2 at 1300° C. in air to make a ceramic substrate;

[0042] Step 4. The glass paste prepared by the B-Bi-Si series glass powder, 3% ethyl cellulose, 15% terpineol and 12% dibutyl citrate by weight ratio by screen printing process Screen printed on ring resistors and baked at 150°C. In the screen printing process, a pattern with a specific shape is used to cover the surface of the ring resistor, so that the glass paste cannot print the position where the ring resistor is used to connect ...

Embodiment 2

[0052] Figure 4 Shown is a schematic structural diagram of a ring-shaped varistor manufactured according to the second embodiment of the present invention, which includes a ring-shaped resistor 10, electrodes 20 distributed on the upper end surface of the ring-shaped resistor 10, and electrodes 20 distributed on the lower end surface of the ring-shaped resistor 10. The glass paste 30.

[0053] Compared with the first embodiment of the present invention, the differences of the second embodiment of the present invention are: the setting of the annular resistor 10 and the electrode 20 is different; the positions where the glass paste 30 is distributed are different; The sintering temperature of the ring-shaped resistor is 650° C., and the other preparation processes are the same as those in the first embodiment of the present invention, and will not be repeated here.

[0054] Through experimental testing, the flexural strength comparison between the ring varistors of various si...

Embodiment 3

[0060] Figure 5 Shown is a schematic structural diagram of a ring-shaped varistor manufactured according to the third embodiment of the present invention, which includes a ring-shaped resistor 10, electrodes 20 distributed on the upper end surface of the ring-shaped resistor 10, and electrodes 20 distributed on the lower end surface of the ring-shaped resistor 10. And the glass paste 30 on the outer side.

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Abstract

The invention discloses a preparation method of a ring varistor. The method comprises the steps that: a ring resistor is prepared; glass slurry is screen-printed on the ring resistor, wherein positions for connection electrodes are preserved; the ring resistor with the screen-printed glass slurry is sintered; and electrodes are connected at the positions for connecting the electrodes. According to the ring varistor preparation method provided by the invention, the screen printing glass slurry is not provided on the ring resistor at the positions of the electrodes. The glass slurry is molten during sintering. The glass slurry wets the ring resistor, and penetrates into the ring resistor, such that an indented state is formed, and a mechanical interlocking connection is formed. Therefore, bending strength of the ring varistor is substantially improved. Also, the invention discloses a ring varistor.

Description

technical field [0001] The invention belongs to the field of preparation of ring piezoresistors, more specifically, the invention relates to a ring piezoresistor with ideal mechanical strength and a preparation method thereof. Background technique [0002] The ring varistor is a semiconductor ceramic electronic component with dual functions of pressure sensitivity and capacitance. It has been widely used in miniature DC brush motors to eliminate sparks, protect brushes and suppress noise: using its pressure sensitive The characteristics absorb the transient sparks generated on the commutator, which can protect the motor brushes and windings; use its capacitance characteristics to suppress electromagnetic interference, which can prolong the working life of the micro-motor and improve the working quality of the micro-motor. [0003] Ring varistors usually include a ring resistor and three or more electrodes connected to the ring resistor. The electrodes can be divided into end...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C17/30H01C7/102
Inventor 王学钊尹峰周水明
Owner GUANGZHOU MAGNET ELECTRICITY