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Preparation method of zinc oxide piezoresistor ceramic material

A technology of ceramic materials and varistors, which is applied in the field of preparation of zinc oxide varistor ceramic materials, can solve the problems of zinc oxide powder with coarse particle size, low nonlinear coefficient, and large leakage current, and achieve uniform particle size, Effect of high nonlinear coefficient and small leakage current

Inactive Publication Date: 2017-10-13
CHANGZHOU OPTICAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is that most of the common zinc oxide varistor ceramic materials are directly mixed and fired with zinc oxide and other metal oxides, and the zinc oxide powder used is coarse and has uneven particle size, resulting in Its defects of large leakage current and low nonlinear coefficient provide a preparation method of zinc oxide varistor ceramic material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Mix alpine moss blondii and lemon in a mass ratio of 5:1 and put them into a pulverizer for 30 minutes to obtain a mixed pulverized product. Mix the mixed pulverized product and monazite in a mass ratio of 10:1 and stack it at a temperature of 30 ℃, air relative humidity of 60% in the greenhouse for 10 days, after the stacking, rinse the surface of the monazite with water for 20 minutes, and rinse the mixed and pulverized material on the surface of the monazite. Add zirconia ball milling beads into the ball mill at a material ratio of 30:1, and grind for 1 hour to obtain monazite powder. Mix the monazite powder and sulfuric acid solution with a mass fraction of 30% at a mass ratio of 1:5, shake the table and impregnate for 3 hours After the impregnation, filter and separate to obtain the filtrate, then transfer the filtrate to a centrifuge, centrifuge at a speed of 3000r / min for 10min, separate and obtain the supernatant, and weigh 40 parts of zinc oxide, 8 parts of bism...

example 2

[0025]Mix gourd moss and lemon at a mass ratio of 5:1 and put them in a pulverizer for 35 minutes to obtain a mixed pulverized product. Mix the mixed pulverized product and monazite at a mass ratio of 10:1 and stack it at a temperature of 35°C. , in a greenhouse with a relative air humidity of 65% for 13 days. After stacking, rinse the monazite surface with water for 25 minutes to wash the mixed and pulverized matter on the surface of the monazite. After washing, put the monazite into a ball mill and press the ball Add zirconia ball milling beads into the ball mill at a ratio of 30:1, and pulverize it for 1 hour to obtain monazite powder. Mix the monazite powder and 30% sulfuric acid solution at a mass fraction of 1:5, shake the table and impregnate for 4 hours. After the impregnation, filter and separate to obtain the filtrate, then transfer the filtrate to a centrifuge, centrifuge at a speed of 3500r / min for 13min, separate and obtain the supernatant, and weigh 45 parts of zi...

example 3

[0027] Put the moss and lemon in a pulverizer for 40 minutes after mixing the moss and lemon in a mass ratio of 5:1 to obtain a mixed pulverized product, and mix the mixed pulverized product and monazite in a mass ratio of 10:1 and stack it at a temperature of 40°C, 15 days in a greenhouse with a relative air humidity of 70%. After the stacking, rinse the surface of the monazite with water for 30 minutes to clean the mixed and pulverized materials on the surface of the monazite. After washing, put the monazite into a ball mill and press The ball-to-material ratio is 30:1. Add zirconia ball milling beads into the ball mill, and ball mill them for 2 hours to obtain monazite powder. Mix the monazite powder and 30% sulfuric acid solution with a mass fraction of 1:5, and then shake the table for oscillating impregnation. 5h, filter and separate to obtain the filtrate after the immersion, then transfer the filtrate to a centrifuge, centrifuge at a speed of 4000r / min for 15min, separa...

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PUM

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Abstract

The invention belongs to the technical field of preparation of functional ceramic materials and in particular relates to a preparation method of a zinc oxide piezoresistor ceramic material. The preparation method comprises the following steps: firstly mixing and stacking a mixture obtained by crushing moss and lemons, and rare-earth ore monazite; carrying out micro-corrosion on the ore by utilizing plant organic carboxylic acid and removing one part of acid-soluble impurities; then crushing the ore and dissolving out rare-earth metal salt by utilizing sulfuric acid; taking the rare-earth metal salt as an additive of a pressure-sensitive material; then, carrying out complexing reaction by utilizing ammonia water and zinc oxide in the presence of carbon dioxide to generate a zinc-ammonia complexing solution; in a process of carrying out ammonia evaporation on the zinc-ammonia complexing solution to obtain basic zinc carbonate, adding compound component metal salt to react with the rare-earth metal salt; filtering and separating to obtain a filter cake and drying, pressing and molding the filter cake; finally, calcining to obtain the piezoresistor ceramic material. According to the preparation method of the zinc oxide piezoresistor ceramic material, utilized zinc oxide powder has a small size and a uniform grain size; the prepared piezoresistor ceramic material has the properties of small leakage current and high non-linear coefficient and is an ideal material for producing a piezoresistor.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional ceramic materials, and in particular relates to a preparation method of a zinc oxide varistor ceramic material. Background technique [0002] The varistor ceramic material refers to a semiconductor ceramic material that has nonlinear ohmic characteristics at a certain temperature and within a certain voltage range, and its resistance value decreases sharply with the increase of voltage. According to this nonlinear ohmic characteristic, this semiconductor ceramic material can be used to make a nonlinear resistor, that is, a piezoresistor. The current commercialized varistors come from varistor ceramic series of different systems such as zinc oxide, titanium dioxide, and strontium titanate. Among them, zinc oxide varistors have become one of the most widely used and best performance varistors due to their advantages of fast response speed, low residual voltage, and low manufacturi...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/622H01C7/112H01C17/30
CPCC04B35/453C04B35/622C04B2235/3224C04B2235/3262C04B2235/3275C04B2235/3294C04B2235/3298C04B2235/781H01C7/112H01C17/30
Inventor 王国峰林茂兰潘宏梅
Owner CHANGZHOU OPTICAL MATERIAL