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Method for preparing nano-added zinc oxide varistor

A varistor and nano-additive technology, applied in varistor, varistor core, resistor manufacturing and other directions, can solve the problems of not being suitable for large-scale industrial production, shortening the service life of sintering furnace, increasing process difficulty, etc. Achieve the effect of improving the uniformity of the microstructure, solving the phenomenon of sticking, and saving the use of raw materials

Inactive Publication Date: 2006-09-13
广东省佛山科星电子有限公司
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Problems solved by technology

This technology has a certain effect in improving some properties of varistors, but this technology has the following shortcomings: First, the sintering temperature reaches 1260°C, which is relatively high, which will increase power consumption and shorten the service life of the sintering furnace , which increases the production cost; second, it is very difficult to uniformly mix a small part of nanomaterials with most of the micron materials, which increases the difficulty of the process
[0005] In the prior art, there is also a plan to prepare ZnO varistors by nanonizing all the main base materials. Although this technology has a comprehensive modification effect, thereby improving the comprehensive electrical properties of the product, especially the flow capacity, but There are two very fatal defects in this process, that is, the process is complicated and the cost is too high, so it is not suitable to be introduced into large-scale industrial production

Method used

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Effect test

Embodiment 1

[0019] Embodiment 1: A kind of preparation method of nano-added zinc oxide varistor, mainly comprises the following steps:

[0020] (1) The additives mainly including materials such as antimony oxide and cobalt oxide are nanometerized to become nano-additives;

[0021] (2) 3% of the main base material zinc oxide is nano-sized;

[0022] (3) remaining 97% of the main base material zinc oxide is still in micron order;

[0023] (4) A small amount of nano-additives are added to zinc oxide to form a homogeneous mixture;

[0024] (5) After sintering at 1000-1050°C, silver flakes with nano-added zinc oxide varistors can be produced.

[0025] Through professional analysis, the nano-added zinc oxide varistor manufactured by the above-mentioned process can increase the breakdown voltage by 10-40%, reduce the leakage current by more than one order of magnitude, but reduce the nonlinear coefficient. When the leakage current and the breakdown voltage are relatively high, the solution of ...

Embodiment 2

[0026] Embodiment 2: A kind of preparation method of nano-added zinc oxide varistor, mainly comprises the following steps:

[0027] (1) 7% of the main base material zinc oxide is nano-sized;

[0028] (2) remaining 93% of the main base material zinc oxide is still in micron order;

[0029] (3) Nano-scale additives including materials such as antimony oxide and bismuth oxide to become nano-additives;

[0030] (4) A small amount of nano-additives are added to the zinc oxide to form a homogeneous mixture;

[0031] (5) After sintering at 1000-1050°C, silver flakes with nano-added zinc oxide varistors can be produced.

[0032] Through professional analysis, the breakdown voltage of the nano-added zinc oxide varistor manufactured by the above process is basically unchanged, but the leakage current is almost zero, but the energy density has decreased. The solution of this embodiment can be used in occasions where the requirement for leakage current is extremely high.

Embodiment 3

[0033] Embodiment 3: A kind of preparation method of nano-added zinc oxide varistor, mainly comprises the following steps:

[0034] (1) 5% of the main base material zinc oxide is nano-sized;

[0035] (2) nanometerization of additives including bismuth oxide, cobalt oxide and other materials to become nano-additives;

[0036] (3) remaining 95% of the main base material zinc oxide is still in micron order;

[0037] (6) A small amount of nano-additives are added to zinc oxide to form a homogeneous mixture;

[0038] (7) After sintering at 1000-1050°C, silver flakes with nano-added zinc oxide varistors can be produced.

[0039] Through professional analysis, the breakdown voltage of the nano-added zinc oxide varistor manufactured by the above process is increased by 10-60%, the nonlinear coefficient is increased by 20-60%, and the leakage current is reduced by 30-50%. Using this embodiment, It can comprehensively improve the performance of the varistor.

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Abstract

A method for preparing piezoresistance with nano-additive and nano-grade of zinc oxide includes forming multiple compositions to be nano-additive, setting 5% of zinc oxide material to be nanograde and 95% of zinc oxide material to be micron grade, adding nano-additive into said zinc oxide material and mixing as well as grinding them, sintering mixed and ground material at temperature of 1000 ¿C 1050 deg.c for obtaining silver plate of piezoresistance with nano-additive and nanograde of zinc oxide.

Description

technical field [0001] The invention relates to a preparation method of a zinc oxide varistor, in particular to a preparation method of a nano-added zinc oxide varistor. Background technique [0002] Due to its excellent nonlinear characteristics and surge resistance characteristics, zinc oxide varistors are widely used in overvoltage protection of electronic circuits and surge absorption of power transmission lines, and the market prospect is very broad. [0003] The preparation of traditional zinc oxide varistors is made of micron materials, and the uniformity of the microstructure is difficult to be further improved, resulting in that the electrical properties of the product cannot be effectively improved. With the rapid development in the past ten years The in-depth study of nanotechnology, its manufacturing technology and control methods are becoming more and more perfect, making it possible for nanotechnology to be adopted on a large scale in industrial production. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/112H01C17/00B82B3/00
Inventor 伦振雄卢金泉简国楷
Owner 广东省佛山科星电子有限公司
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