TiO2 non-linear pressure-sensitive ceramic resistor and its preparation method

A technology of varistor ceramics and resistors, which is applied in the field of TiO2 non-linear varistor ceramic resistors without Bi and Pb and its preparation. Effects of cracking, prolonging motor life, and improving electrical performance

Inactive Publication Date: 2006-10-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As reported in U.S. Patent US4306214, it is currently used in TiO 2 The dopants of varistors mostly contain Bi and Pb, but Bi and Pb are volatile during sintering, which not only makes it difficult to control the performance of the sample, but also pollutes the environment

Method used

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  • TiO2 non-linear pressure-sensitive ceramic resistor and its preparation method
  • TiO2 non-linear pressure-sensitive ceramic resistor and its preparation method
  • TiO2 non-linear pressure-sensitive ceramic resistor and its preparation method

Examples

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Comparison scheme
Effect test

preparation example Construction

[0021] The preparation method of the nonlinear varistor ceramic resistor is:

[0022] 1) Weigh the required raw materials according to the value range of x and y in the ceramic substrate, and carry out the mixed ball milling process to the raw material powder according to the conventional method, so that the particle size of various powder raw materials is less than 2 microns;

[0023] 2) Sieve the ball-milled mixed powder, manually granulate or spray granulate the ball-milled and sieved powder, and sieve the granulated powder to shape the granulated and sieved powder;

[0024] 3) The formed embryo body is fired at 600°C to 1120°C to remove the organic binder and make it have a certain strength;

[0025] 4) The green body that has been fired to remove the organic binder is sintered in the air, the temperature is between 1050°C-1450°C, and the sintering time is between 0.5-10 hours; the partial pressure of oxygen during sintering is not less than 0.2 atmospheres .

[0026] 5)...

Embodiment 1

[0030] Embodiment 1, garden flake-shaped sample

[0031] Using industrial reagent pure TiO 2 , additive Nb 2 o 5 , CeO 2 and sintering aid SiO 2, mixed according to the composition in Table 1, planetary milling 250 rpm, ball milling for 5 hours, drying, granulation, 150MPa dry pressing to form a disc-shaped embryo body with a diameter of 10mm and a thickness of 1.2mm, after 600℃~1120℃ Accompanied firing removes organic binders and imparts strength. Sintering at 1350°C in the air, heat preservation for 4 hours, one-time firing, 2-3 layers of samples stacked, and calcined TiO 2 Powder as padding. The two sides of the ceramic chip are fired with Ag electrodes, and the silver is fired at 580°C for 15 minutes. The sample is measured with a piezoresistor DC parameter measuring instrument for V 1mA , Measure capacitance C and loss tgδ with LCR digital electric bridge.

[0032] The contents of Nb and Si are fixed, and the content of Ce is changed from 0 to 5.0mol%. The electr...

Embodiment 2

[0036] What is to be done in Example 2 is to compare samples 1-5 in Example 1 with samples obtained by changing the sintering regime.

[0037] Fix other parameters, such as reagent ratio, carry out all the processes as in Example 1, the difference is the change of sintering system as shown in Table 2, including sintering temperature and holding time, at 1300 ° C ~ 1400 ° C × 2h ~ 4h At the sintering temperature of , the samples made were measured similarly to those in Example 1. The results are shown in Table 2.

[0038] This example shows that the influence of sintering temperature and holding time on the comprehensive electrical properties of the sample is not linear. The voltage V of samples 2-3 1mA , nonlinear characteristics and relative permittivity and loss are in the best balance. The composition and firing regime of this sample are then optimal in the present invention.

[0039] Sample

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Abstract

The invention discloses a TiO-containing compound with dual functions of pressure sensitivity and capacitance, which belongs to the field of information electronic components. 2 Non-linear varistor ceramic resistors and methods of making the same. The non-linear piezo-sensitive ceramic resistor is made by coating a layer of electrodes on the surface of a disc-shaped or ring-shaped ceramic substrate. The chemical composition formula of its ceramic substrate is A x B・TiO 2 . Manufacture of Bi and Pb-free TiO on ceramic substrates 2 It is a nonlinear varistor ceramic resistor, which solves the shortcomings of Bi and Pb oxides contained in the dopant in the past, not only improves the thermal shock resistance of the varistor, but also through the appropriate selection of the molar ratio and the amount of semiconducting agent And types, can improve the electrical properties of varistors, and meet the practical requirements of electrical properties. Used in DC micro-motors, it can not only effectively eliminate electromagnetic noise, but also prolong the life of the motor.

Description

technical field [0001] The invention belongs to the field of information electronic components, in particular to a kind of Bi and Pb-free TiO with pressure-sensitive-capacitance dual functions 2 A non-linear varistor ceramic resistor and its preparation method. Background technique [0002] A varistor is a resistive element whose resistance changes nonlinearly with the applied voltage, that is, a resistor whose resistance decreases rapidly when the applied voltage value exceeds a certain threshold voltage. It is an electronic component whose resistance is sensitive to external voltage and can be used repeatedly without damage. [0003] The traditional ZnO series varistor has excellent nonlinear varistor characteristics. As a medium and high voltage varistor, it has important functions such as overvoltage protection, high energy surge absorption and high voltage regulation, and is widely used in power systems, electronic circuits and in household appliances. However, it ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/115H01C17/00
Inventor 张中太李红耘罗绍华唐子龙
Owner TSINGHUA UNIV
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