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Zinc oxide base high potential gradient pressure-sensitive ceramic material and its preparation method and uses

A varistor ceramic, zinc oxide-based technology, applied in the direction of varistors, varistor cores, etc., can solve the problems of large leakage current and small nonlinear coefficient, and achieve strong pulse impact resistance and reduce Volume and weight, the effect of simple manufacturing process

Inactive Publication Date: 2007-05-16
山东鸿荣电子有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Patent application number 200610042720.X (a ZnO-Bi doped with rare earth oxide 2 o 3 It is a pressure-sensitive ceramic medium) discloses a pressure-sensitive material that can obtain a potential gradient of 500V / mm, but its nonlinear coefficient is small and the leakage current is large

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  • Zinc oxide base high potential gradient pressure-sensitive ceramic material and its preparation method and uses

Examples

Experimental program
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Effect test

Embodiment 1～16

[0033] The commercially available indirect method zinc oxide with a purity of 99.7% is used as the main component, and its average particle size is less than 1 micron. The first auxiliary component adopts commercially available chemically pure Bi 2 o 3 、Co 3 o 4 , MnCO 3 、Cr 2 o 3 、Ni 2 o 3 , SiO 2 ; The second secondary component adopts commercially available chemically pure Sb 2 o 3 ; The third subcomponent adopts commercially available analytically pure Ho 2 o 3 and Er 2 o 3 ; The fourth secondary component adopts commercially available analytical pure Al(NO 3 ) 3 9H 2 O.

[0034] The distribution ratio of each component is according to Table 1, and a total of 18 groups of samples were produced, including two groups of comparison samples. Comparative sample 1 is without Ho 2 o 3 and Er 2 o 3 The general potential gradient base formula; Comparative sample 2 is excess Ho 2 o 3 and Er 2 o 3 recipe.

[0035] Weigh the required Bi according to Table 1 ...

Embodiment 17～18

[0048] The chemical compositions of Example 9 and Example 14 were used to prepare Example 17 and Example 18 samples respectively.

[0049] The origin and purity of the raw materials used are the same as those in Examples 1-16, and the difference from Examples 1-16 lies in the manufacturing process of the additive slurry.

[0050] Weigh the required Bi according to the corresponding chemical composition 2 o 3 、Co 3 o 4 , MnCO 3 、Cr 2 o 3 、Ni 2 o 3 , SiO 2 , Sb 2 o 3 、Ho 2 o 3 、Er 2 o 3 , add pure water and mix ball milling until the average particle size is less than 1 μm, put it into an alumina crucible after drying, heat and pre-fire at 800 ° C for 2 hours, add pre-burned additives and pure water ball milling until the average particle size is less than 1 μm. Additive slurry. Subsequent production methods are the same as in Examples 1-16. The obtained electrical performance test results of the samples are listed in Table 3. Compared with the corresponding te...

Embodiment 19～24

[0052] Using the chemical composition of the 7 groups of samples in Example 6, 6 groups of samples were prepared respectively. Except that the sintering temperature is different, the manufacturing process is the same as that of Examples 17-18. Six groups of samples were made with different sintering temperatures and recorded as Examples 19-24 respectively. The test results of the samples are listed in Table 4.

[0053] From the results listed in Table 4, it can be seen that the pressure-sensitive material of the present invention can be sintered at a temperature range of 1100-1250°C. As the sintering temperature increases, the potential gradient decreases, but if the sintering temperature is too high or too low, the ability of the material to withstand the impact current will be reduced. The potential gradient of the pressure-sensitive materials obtained in Examples 19-24 is about 350-500 V / mm.

[0054] Table 1

[0055]

Numbering

The first subcomponent (mo...

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Abstract

The invention discloses a zinc oxide base high-potential gradient voltage-sensitive ceramic material and preparing method and application, which comprises the following parts: 100mol ZnO as main component, first accessory ingredient within Bi2O3, Co2O3, MnO2, Cr2O3, Ni2O3 with molar quantity at 0.5-1.2mol respectively, second accessory ingredient with 0.8-1.5mol Sb2O3, third accessory ingredient with 0.2-1.2mol Ho2O3 and or Er2O3, forth accessory ingredient with 0.002-0.005mol Al2O3. The preparing method comprises the following steps: blending each component together to make spraying slurry; spraying; drying; graining; proceeding dry pressing; moulding; sintering. The potential gradient of voltage-sensitive ceramic material is 300-500V / mm with non-linear coefficient is more than 50, which can be applied in the electric lightning arrester or other lightning protection overvoltage protection of electric electronic circuit due to strong pulse attack resistance ability.

Description

technical field [0001] The invention relates to a pressure-sensitive ceramic material, in particular to a zinc oxide-based high potential gradient pressure-sensitive ceramic material and a preparation method and application thereof. Background technique [0002] Varistor ceramic materials can be used to manufacture high-potential gradient varistors, which can be used to manufacture lightning arresters or varistors, which are used in power electronic circuits to absorb abnormal overvoltages to protect circuit systems. Power electronic circuits often cause abnormal overvoltage due to lightning strikes or load switching. ZnO varistor ceramic materials have been widely used in power electronic circuits to absorb or suppress abnormal overvoltage to protect power electronic equipment from damage. [0003] However, the potential gradient (varistor voltage per unit thickness) of ZnO varistor materials that have been used is usually lower than 250V / mm. For power electronic circuits w...

Claims

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Application Information

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IPC IPC(8): C04B35/453H01C7/108C04B35/622
Inventor 卢振亚李宇翔
Owner 山东鸿荣电子有限公司
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