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Low-pressure pressure-sensitive ceramic material and preparation method thereof

A varistor ceramic, low-voltage technology, applied in the direction of varistor, can solve the problems of increasing the preparation cost and the difficulty of process control, safety problems, etc., and achieve the effect of wide sintering temperature and simple production process

Inactive Publication Date: 2009-10-14
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the production process, the reducing atmosphere is usually composed of N 2 +H 2 Provide, which not only increases the difficulty of preparation cost and process control, but also has safety problems in the preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The composition and content mass ratio of described material are:

[0039] A. 57.4% SrO+40.7% TiO 2 +0.7%Nb 2 o 5 +0.8%CeO 2 +0.4%MnO

[0040] B. 92.4%Al 2 o 3 +0.1%Co 2 o 3 +3.5%MnO+2.5%Cr 2 o 3+0.3%SiO2 2 +1.5%TiO 2

[0041] Weigh the reagents according to the ratio of the mass ratio of the two groups of components A and B to 4:6, mix the materials, ball mill, dry, granulate, and shape, put the formed samples in a vacuum graphite furnace for sintering at 1500°C, and cool with the furnace After surface treatment and cleaning, the upper electrode was tested, and the performance parameters of the obtained pressure-sensitive ceramic material were tested: the capacitance C was 0.8 μF, and the dielectric constant ε was 9.9×10 6 , the varistor voltage U 1mA = 0.6V, U 10mA =1.8V, nonlinear coefficient a=2.1.

Embodiment 2

[0043] The composition and content mass ratio of described material are:

[0044] A. 57.4% SrO+40.7% TiO 2 +0.7%Nb 2 o 5 +0.8%CeO 2 +0.4%MnO

[0045] B. 92.4%Al 2 o 3 +0.1%Co 2 o 3 +3.5%MnO+2.5%Cr 2 o 3 +0.3%SiO2 2 +1.5%TiO 2

[0046] Weigh the reagents according to the ratio of the mass ratio of the two groups of components A and B to 4:6, mix the materials, ball mill, dry, granulate, and shape, put the formed samples in a vacuum graphite furnace for sintering at 1350°C, and keep them for 2 hours Cool with the furnace, after surface treatment and cleaning, put on the electrode, and test the performance parameters of the obtained pressure-sensitive ceramic material: the capacitance C is 22μF, the dielectric constant ε is 1.5×10 8 , the varistor voltage U 1mA =6.3V, U 10mA =11.6V, nonlinear coefficient a=3.8.

Embodiment 3

[0048] Another component and content mass ratio of described material are:

[0049] A. 57.4% SrO+40.7% TiO 2 +0.7%Nb 2 o 5 +0.8%CeO 2 +0.4%MnO

[0050] B. 92.4%Al 2 o 3 +0.1%Co 2 o 3 +3.5%MnO+2.5%Cr 2 o 3 +0.3%SiO2 2 +1.5%TiO 2

[0051] Weigh the reagents according to the ratio of the mass ratio of the two groups of components A and B to 5.5:4.5, mix the materials, ball mill, dry, granulate, and shape, put the formed samples in a vacuum graphite furnace for sintering at 1320°C, and keep them warm for 3 hours Cool with the furnace, after surface treatment and cleaning, put on the electrode, and test the performance parameters of the obtained pressure-sensitive ceramic material: the capacitance C is 0.05μF, the dielectric constant ε is 6.1×10 5 , the varistor voltage U 1mA =2.8V, U 10mA =4.4V, nonlinear coefficient a=5.1.

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Abstract

The invention relates to a low-pressure pressure-sensitive ceramic material and a preparation method thereof. The material comprises a component A and a component B and contents thereof by mass percent are as follows: A comprises 57.4 percent of SrO, 40.7 percent of TiO2, 0.7 percent of Nb2O5, 0.8 percent of CeO2 and 0.4 percent of MnO; and B comprises 92.4 percent of Al2O3, 0.1 percent of Co2O3, 3.5 percent of MnO, 2.5 percent of Cr2O3, 0.3 percent of SiO2 and 1.5 percent of TiO2; pure reagents are taken according to a mass ratio of the component A and the component B being equal to 4:6 to 6:4, subjected to mixing, ball milling, drying, pelleting and sintering in a vacuum graphite oven at the temperature of 1305 to 1500 DEG C after being pressed and formed, and are cooled with the oven or cooled with the oven after being kept at constant temperature for 1 to 3h; surface treatment and cleaning are conducted to a sample after sintering, and the pressure-sensitive ceramic material with C=0.02 to 22muF, epsilon=1.7*10 to 1.5*10, U1mA=0.6 to 6.3V, U10mA=1.8 to 11.6V and alpha=2.1 to 5.1 is obtained after put through electrode; and the preparation method is simple, safe and reliable.

Description

1. Technical field [0001] The invention relates to a low-voltage pressure-sensitive ceramic material and a preparation method thereof, belonging to the technical field of electrical components and material manufacturing thereof 2. Technical Background [0002] With the miniaturization, integration, and low-voltage development of electronic products, the demand for low-voltage varistor ceramic materials is increasing. Varistor ceramics have capacitive effect and varistor effect, which can play the dual role of overvoltage protection and noise filtering. At present, ZnO varistor ceramics are the most widely used, but its static capacitance is too small, and its dielectric constant is small (about 10 3 About), the varistor voltage is not low enough (> 20V / mm), it is difficult to manufacture a varistor of several volts. SrTiO 3 Compared with ZnO varistor ceramic materials, it not only has excellent non-ohmic characteristics, but also has a large electrostatic capacity (3-1...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622H01C7/10
Inventor 王宁章马玉田沙沙秦国宾
Owner GUANGXI UNIV
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