Annular piezoresistor ceramic and preparation method thereof, and annular piezoresistor and preparation method thereof

A varistor, varistor technology, applied in varistor cores, varistors, resistors, etc.

Active Publication Date: 2013-09-25
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a ceramic material for ring varistors to broaden the working environment temperature range of ring varistors in view of the current problem that ring varistors are only suitable for motors working at normal ambient temperatures

Method used

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  • Annular piezoresistor ceramic and preparation method thereof, and annular piezoresistor and preparation method thereof
  • Annular piezoresistor ceramic and preparation method thereof, and annular piezoresistor and preparation method thereof
  • Annular piezoresistor ceramic and preparation method thereof, and annular piezoresistor and preparation method thereof

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Experimental program
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preparation example Construction

[0053] see figure 1 , the preparation method of ring-shaped piezoresistor ceramic material according to one embodiment, includes the following steps S110 and S120.

[0054] Step S110: mixing strontium titanate, calcium titanate, sodium bismuth titanate, niobium pentoxide, lanthanum oxide, cobalt trioxide and titanium dioxide to obtain a mixture.

[0055] In the above mixture, based on mole percentage, strontium titanate accounts for 50-70 mol%, calcium titanate accounts for 15-35 mol%, sodium bismuth titanate accounts for 7-12 mol%, niobium pentoxide accounts for 1-3 mol%, lanthanum oxide accounts for 0.1-1mol%, dicobalt trioxide accounts for 0.1-1.5mol%, and titanium dioxide accounts for 1-4mol%.

[0056] In a preferred scheme, the molar percentages of the above-mentioned components are respectively: strontium titanate (SrTiO 3 ) 55mol%, calcium titanate (CaTiO 3 ) 30mol%, sodium bismuth titanate ((BiNa)TiO 3 ) 10mol%, niobium pentoxide (Nb 2 o 5 ) 2mol%, lanthanum oxid...

Embodiment 1

[0102] Ceramic materials for ring varistors and preparation of ring varistors

[0103] 1. Preparation of ceramic materials for ring varistors

[0104] (1) will Bi 2 o 3 、Na 2 CO 3 and TiO 2 After weighing according to the molar ratio of 1:1:2, put it into the ball mill jar, add deionized water, and put the agate balls, so that the Bi in the ball mill jar 2 o 3 、Na 2 CO 3 and TiO 2 The ratio of the total mass of the total mass, the quality of the agate ball and the mass of deionized water is 1:2:1.5, and then ball milled for 30 hours to make Bi 2 o 3 、Na 2 CO 3 、TiO 2 Mix well with deionized water, and further use a spray drying tower to 2 o 3 、Na 2 CO 3 、TiO 2 Dry the mixture with deionized water to obtain a powder; put the powder into a tunnel-type high-temperature electric furnace, and keep it in air at 900°C for 2 hours. Mesh sieving to obtain bismuth sodium titanate ((BiNa)TiO 3 );

[0105] (2) SrTiO 3 , CaTiO 3 , Nb 2 o 5 , La 2 o 3 、Co 2 o 3 ...

Embodiment 2

[0115] Ceramic materials for ring varistors and preparation of ring varistors

[0116] 1. Preparation of ceramic materials for ring varistors

[0117] (1) will Bi 2 o 3 、Na 2 CO 3 and TiO 2 After weighing according to the molar ratio of 1:1:2, put it into the ball mill jar, add deionized water, and put the agate balls, so that the Bi in the ball mill jar 2 o 3 、Na 2 CO 3 and TiO 2 The ratio of the total mass of the total mass, the quality of the agate ball and the mass of deionized water is 1:2:1.5, and then ball milled for 20 hours to make Bi 2 o 3 、Na 2 CO 3 、TiO 2 Mix well with deionized water, and further use a spray drying tower to 2 o 3 、Na 2 CO 3 、TiO 2Dry the mixture with deionized water to obtain a powder; put the powder into a tunnel-type high-temperature electric furnace, and keep it in air for 3 hours at 850°C. Mesh sieving to obtain bismuth sodium titanate ((BiNa)TiO 3 );

[0118] (2) SrTiO 3 , CaTiO 3 , Nb 2 o 5 , La 2 o 3 、Co 2 o 3 、...

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Abstract

The invention relates to an annular piezoresistor ceramic and a preparation method thereof, and an annular piezoresistor and a preparation method thereof. The annular piezoresistor ceramic comprises 50-70 mol% of strontium titanate, 15-35 mol% of calcium titanate, 7-12 mol% of sodium bismuth titanatee, 1-3 mol% of niobium pentaoxide, 0.1-1 mol% of lanthanum oxide, 0.1-1.5 mol% of cobaltic oxide and 1-4 mol% of titanium dioxide. The composition and ratio of the host crystal material, semiconducting material and combustion-supporting material are optimized to obtain the annular piezoresistor ceramic. The voltage variation of the annular piezoresistor prepared from the annular piezoresistor ceramic does not exceed 10% in a 0-125 DEG C temperature rise environment; and thus, the annular piezoresistor can be used in a motor working at higher environment temperature, thereby widening the application temperature range of the annular piezoresistor.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to an annular varistor ceramic material, a preparation method, an annular varistor and a preparation method thereof Background technique [0002] Ring varistors are often used in micro DC brushed motors to eliminate sparks in carbon brushes. At present, the main components of the ceramic materials used to prepare the ceramic substrates of ring-shaped varistors that are widely used in the market are generally divided into two categories: zinc oxide and strontium titanate. Strontium titanate varistors are generally used in relatively high-end motor noise reduction due to their large capacitance and good pressure-sensitive characteristics, such as motors for digital cameras, printers, CD players, and mobile phones. However, the main component is a single strontium titanate ceramic material, and the annular varistor produced by it has the characteristic of decreasing the varistor v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/622H01C7/115H01C17/00
Inventor 梁戈仁邓佩佳黄月霞梁俊杰
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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