Preparation method for pressure-sensitive material applied to ceramic resistor body

A technology of varistor materials and ceramic resistors, which is applied in the manufacture of resistors, varistor cores, resistors, etc., can solve the problems of high varistor voltage and low nonlinear coefficient of varistors, and reduce the varistor voltage , high energy density, and the effect of improving performance

Inactive Publication Date: 2018-04-20
SICHUAN QIXING ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for preparing a pressure-sensitive material used in ceramic resistors to solve the existing problems of TiO 2 The problem of high varistor voltage and low nonlinear coefficient of varistor

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment 1

[0022] This embodiment provides a method for preparing a pressure-sensitive material for a ceramic resistor, comprising the following steps:

[0023] a. TiO 2 Powder, SnO 2 Powder, Bi 2 o 3 powder, MnO2 powder and SiO 2 The powder is mixed evenly to obtain a mixed material, in which SnO 2 The molar percentage of powder in the mixed material is 0.5%, Bi 2 o 3 The molar percentage of powder in the mixed material is 0.25%, MnO 2 The molar percentage of powder in the mixed material is 0.15%, SiO 2 The molar percentage of powder in the mixed material is 0.4%;

[0024] b. Using absolute ethanol as a dispersant, the mixture described in step a is ball-milled, dried, and passed through a 300-mesh standard sieve;

[0025] c. Add 5% PVA to the sieved mixture described in step b, carry out secondary ball milling, drying, granulate after passing through a 200-mesh standard sieve, and press the granulated material into a block under a pressure of 180MPa materials, and carry out p...

Embodiment 2

[0029] This embodiment provides a method for preparing a pressure-sensitive material for a ceramic resistor, comprising the following steps:

[0030] a. TiO 2 Powder, SnO 2 Powder, Bi 2 o 3 Powder, MnO 2 Powder and SiO 2 The powder is mixed evenly to obtain a mixed material, in which SnO 2 The molar percentage of powder in the mixed material is 0.8%, Bi 2 o 3 The molar percentage of powder in the mixed material is 0.4%, MnO 2 The molar percentage of powder in the mixed material is 0.24%, SiO 2 The molar percentage of powder in the mixed material is 0.64%;

[0031] b. Using absolute ethanol as a dispersant, the mixture described in step a is ball-milled, dried, and passed through a 320-mesh standard sieve;

[0032] c. Add 6% PVA to the sieved mixture described in step b, carry out secondary ball milling, drying, granulate after passing through a 300-mesh standard sieve, and press the granulated material into block under 200MPa pressure materials, and carry out plasti...

Embodiment 3

[0036] a. TiO 2 Powder, SnO 2 Powder, Bi 2 o 3 Powder, MnO 2 Powder and SiO 2 The powder is mixed evenly to obtain a mixed material, in which SnO 2 The molar percentage of powder in the mixed material is 1%, Bi 2 o 3 The molar percentage of powder in the mixed material is 0.5%, MnO 2 The molar percentage of powder in the mixed material is 0.3%, SiO 2 The molar percentage of powder in the mixed material is 0.8%;

[0037] b. Using absolute ethanol as a dispersant, the mixture described in step a is ball-milled, dried, and passed through a 350-mesh standard sieve;

[0038] c. Add 6% PVA to the sieved mixture described in step b, carry out secondary ball milling, drying, granulate after passing through a 350-mesh standard sieve, and press the granulated material into a block under a pressure of 220MPa materials, and carry out plastic discharge treatment at 700°C for 5 hours;

[0039] d. Sinter the bulk material obtained in step c at 1400°C for 3 hours, then cool the mat...

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PUM

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Abstract

The invention discloses a method for preparing a pressure-sensitive material used for ceramic resistors. In the method of the invention, TiO2 powder, SnO2 powder, Bi2O3 powder, MnO2 powder and SiO2 powder are uniformly mixed to obtain a mixed material, and then the mixed material is Wet grinding, drying, sieving, adding binder and grinding, continue sieving, and then granulate, and then press the powder into block material; heat the block material to remove glue, reheat sintering and cool to room temperature, and then grind , cleaning, drying, silver-plated electrodes and packaging to obtain (SnO2, Bi2O3, MnO2 and SiO2) co-doped TiO2 varistors. The invention improves the performance of TiO2 series varistor ceramic resistors and simplifies the production process.

Description

technical field [0001] The invention relates to the field of electronic devices, in particular to a preparation method of a pressure-sensitive material used for ceramic resistors. Background technique [0002] The varistor is a voltage limiting protection device. Utilizing the nonlinear characteristics of the varistor, when an overvoltage occurs between the two poles of the varistor, the varistor can clamp the voltage to a relatively fixed voltage value, thereby realizing the protection of the subsequent circuit. In recent years, with the rapid development of information technology, miniaturization, multi-function, and high stability of electronic equipment have become an inevitable trend of development, and varistors as protective semiconductor components are also moving towards low voltage and high reliability. develop. while TiO 2 The varistor has excellent current-voltage nonlinear characteristics, ultra-high dielectric constant, easy to achieve low voltage, and the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/46C04B35/64C04B41/88H01C17/00H01C7/115
CPCC04B35/46C04B35/64C04B41/5116C04B41/88C04B2235/3267C04B2235/3293C04B2235/3298C04B2235/3418C04B2235/6565H01C7/115H01C17/00
Inventor 江明泓
Owner SICHUAN QIXING ELECTRONICS
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