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Zinc oxide piezoresistive element with solder alloy layer electrode and preparation method thereof

A varistor and zinc oxide technology, which is applied in varistors, overvoltage protection resistors, resistance manufacturing, etc., can solve the problems of inapplicable preparation, increase of preparation cost, complicated process, etc., to increase mechanical bonding and ohmic The contact area, the elimination of electrode sintering and spraying processes, and the effect of reducing manufacturing costs

Active Publication Date: 2020-09-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process flow of these process schemes is generally complicated and not suitable for the preparation of zinc oxide varistors, and the active metal materials used in the process schemes contain more precious metals Ag, Ga, and rare earth elements. If they are directly used to prepare zinc oxide The piezoresistor will increase its manufacturing cost

Method used

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  • Zinc oxide piezoresistive element with solder alloy layer electrode and preparation method thereof
  • Zinc oxide piezoresistive element with solder alloy layer electrode and preparation method thereof
  • Zinc oxide piezoresistive element with solder alloy layer electrode and preparation method thereof

Examples

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Effect test

Embodiment 1

[0049] In this example, two active solders with different Ag contents were used to prepare samples for comparison, and their specific components are shown in Table 1. Single-layer solder alloy layer electrodes were prepared on the surface of 14E-type circular zinc oxide ceramic sheets by hot head scraping coating brazing, and then combined with the flame heating brazing process to prepare single-layer solder alloy layer electrodes. Zinc varistor element. The structural representation of the zinc oxide varistor element of the prepared single-layer solder alloy layer electrode is as follows figure 1 As shown, it specifically includes a zinc oxide ceramic sheet 1, a solder alloy layer electrode 2 and an electrode lead 3; the circular zinc oxide ceramic sheet 1 is provided with a solder alloy layer electrode 2, the solder alloy layer electrode 2 and the electrode lead 3 to form a connection. For the zinc oxide piezoresistive elements of the two solder alloy layer electrodes in t...

Embodiment 2

[0068] This embodiment uses Sn0.8Ag2Ti0.5Zn (0.1Ce) active solder, and its composition is shown in Table 3. The solder alloy layer electrode is first prepared on the surface of the 20E circular zinc oxide ceramic sheet by ultrasonic assisted active solder; combined with the hot air heating brazing process to complete the interconnection between the lead wire / solder alloy layer electrode / zinc oxide ceramic sheet ; Afterwards, a second layer of sprayed aluminum electrode layer is prepared on the surface of the solder alloy layer electrode and the electrode lead wire by using a thermal spraying process. The schematic diagram of the cross-sectional structure of the final prepared double-layer electrode zinc oxide varistor element is shown in image 3 As shown, it specifically includes a zinc oxide ceramic sheet 1, a solder alloy layer electrode 2, an electrode lead 3 and a sprayed aluminum electrode 5; The solder alloy layer electrode 2 is connected with the electrode lead 3; aft...

Embodiment 3

[0088] In this embodiment, Sn1.5Ag3Ti0.5Zn active solder is used, and its composition is shown in Table 5. The active solder is assisted by ultrasonic waves, and a solder alloy layer electrode is prepared on the surface of the 34S square zinc oxide ceramic sheet; combined with the flame heating brazing process, the interconnection between the lead wire / solder alloy layer electrode / zinc oxide ceramic sheet is completed ; After that, a second layer of sprayed aluminum electrode layer is prepared on the surface of the solder alloy layer electrode and the electrode lead wire by using a thermal spraying process. The schematic diagram of the cross-sectional structure of the final prepared double-layer electrode zinc oxide varistor element can still refer to the schematic diagram image 3 , specifically including a zinc oxide ceramic sheet 1, a solder alloy layer electrode 2, an electrode lead 3 and a sprayed aluminum electrode 5; the zinc oxide ceramic sheet 1 is provided with a sol...

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Abstract

The invention discloses a zinc oxide piezoresistor component of a brazing alloy layer electrode and a fabrication method of the zinc oxide piezoresistor component. The zinc oxide piezoresistor component comprises a zinc oxide ceramic sheet, an electrode layer and an electrode lead, wherein the electrode layer is arranged on at least one an upper surface and a lower surface of the zinc oxide ceramic sheet, the electrode layer is connected with the electrode lead, and the electrode layer completely or partially covers a surface of the zinc oxide ceramic sheet. The fabrication method comprises the steps of selecting the annealed zinc oxide ceramic sheet, and pre-heating to 200-280 DEG C after cleaning and drying; placing an active brazing material on the upper surface of the zinc oxide ceramic sheet; and pre-heating a hot head to 240-500 DEG C, inserting the hot head to the active brazing material for scrubbing for 10-30 seconds in a forward-backward and leftward-rightward way, and layingthe brazing material on the surface of the zinc oxide ceramic sheet to form the brazing alloy layer electrode. The zinc oxide piezoresistor component has the characteristics of a few energy consumption, greenness, environmental friendliness, high connection reliability of a welding point and the like, the process is simple and easy to operate, a precious metal electrode material is prevented frombeing employed, and the production cost of the zinc oxide piezoresistor ceramic component can be reduced by 40% or above.

Description

technical field [0001] The invention relates to a zinc oxide varistor element, in particular to a zinc oxide varistor element with a solder alloy layer electrode and a preparation method thereof, belonging to the technical field of electronic ceramic element electrodes. Background technique [0002] Zinc oxide varistors have excellent nonlinear volt-ampere characteristics, high surge energy absorption capacity, low residual voltage ratio, small leakage current and other characteristics, so zinc oxide varistors are often used in circuits overvoltage protection components. In the process of preparing zinc oxide varistors, in order to realize the connection between the zinc oxide ceramic sheet and the external circuit, the method currently used is to metallize the surface of the zinc oxide ceramic sheet to prepare the electrode layer, and then perform low-temperature soldering connect. At present, the electrodes on the surface of zinc oxide ceramic sheets are generally sinter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/12H01C1/144H01C17/00H01C17/28
Inventor 张新平王凯周敏波黄海军张泽均孙涛
Owner SOUTH CHINA UNIV OF TECH
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