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Negative resistance temperature coefficient zinc oxide linear resistance ceramic material and preparation method

A temperature coefficient, linear resistance technology, applied in the field of negative resistance temperature coefficient zinc oxide linear resistance ceramic materials and preparation, can solve the problems of application field limitation, achieve the effect of light weight, prevent overheating and burnout, and occupy less floor space

Inactive Publication Date: 2012-07-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Zinc oxide linear resistance is a functional material based on the zinc oxide-magnesium oxide-alumina ternary system; Chinese patent No. 96123503.9 discloses a zinc oxide ceramic linear resistor Resistor and its manufacturing method. The novel ceramic resistor prepared by this method has better anti-surge capability, its voltage nonlinear coefficient is 1.26, which is obviously high, and its temperature resistance coefficient is 4.5×10-2ohm / °C is a positive value, so its application field is greatly limited; Chinese patent No. 02140486.0 also discloses a zinc oxide ceramic linear resistor and its manufacturing method. The new ceramic resistor prepared by this method has relatively high Good voltage non-linear coefficient, its voltage non-linear coefficient can be as low as 1.1, and its temperature resistance coefficient has also been significantly improved, which has been as low as 1.0×10-3 ohm / ℃, but it is still positive. Therefore, its application field is also limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Weigh zinc oxide with a molar percentage of 95%, magnesium oxide with a molar percentage of 1.0%, and a molar percentage of 3.0%

[0021] Aluminum oxide, 1.0% orthosilicic acid by mole.

[0022] (2) After mixing zinc oxide, magnesium oxide, aluminum oxide and orthosilicic acid, use agate balls, nylon tanks, and use absolute ethanol as the ball

[0023] Milling medium, mass ratio of ball:powder:absolute ethanol=20:1:6, high-energy ball mill wet grinding for 5 hours, slurry passed through a 100-mesh sieve and then dried.

[0024] (3) After drying, add PVA with a mass percentage of 2%, and the added amount is 1 / 40 of the raw material mass. After passing through a 50-mesh sieve, press it into Ф12

[0025] mm×2.0 mm green body.

[0026] (4) The green body is heated to 1250°C at a speed of 5°C / min in a resistance furnace, kept in an air atmosphere for 5h, and cooled with the furnace.

[0027] The zinc oxide linear resistance made in this embodiment is tested through pe...

Embodiment 2

[0029] (1) Weigh zinc oxide with a molar percentage of 90%, magnesium oxide with a molar percentage of 3.0%, and a molar percentage of 5.

[0030] alumina, 2.0% orthosilicic acid by mole percent.

[0031] (2) After mixing zinc oxide, magnesium oxide, aluminum oxide and orthosilicic acid, use agate balls, nylon tanks, and use absolute ethanol as the ball

[0032] Milling medium, mass ratio of ball:powder:absolute ethanol=20:1:6, high-energy ball mill wet grinding for 5 hours, slurry passed through a 100-mesh sieve and then dried.

[0033] (3) After drying, add PVA with a mass percentage of 2%, and the added amount is 1 / 40 of the raw material mass. After passing through a 50-mesh sieve, press it into Ф12

[0034] mm×2.0 mm green body.

[0035] (4) The green body is heated to 1350°C at a rate of 5°C / min in a resistance furnace, kept in an air atmosphere for 3 hours, and cooled with the furnace.

[0036] The zinc oxide linear resistance made in this embodiment is tested through...

Embodiment 3

[0038] (1) Weigh zinc oxide with a molar percentage of 93%, magnesium oxide with a molar percentage of 1.0%, and a molar percentage of 3.0%

[0039] Aluminum oxide, 3.0% orthosilicic acid by mole.

[0040] (2) After mixing zinc oxide, magnesium oxide, aluminum oxide and orthosilicic acid, use agate balls, nylon tanks, and use absolute ethanol as the ball

[0041] Milling medium, mass ratio of ball:powder:absolute ethanol=20:1:6, high-energy ball mill wet grinding for 5 hours, slurry passed through a 100-mesh sieve and then dried.

[0042] (3) After drying, add PVA with a mass percentage of 2%, and the added amount is 1 / 40 of the raw material mass. After passing through a 50-mesh sieve, press it into Ф12

[0043] mm×2.0 mm green body.

[0044] (4) The green body is heated to 1300°C at a rate of 5°C / min in a resistance furnace, kept in an air atmosphere for 4 hours, and cooled with the furnace.

[0045] The zinc oxide linear resistance made in this embodiment is tested throug...

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Abstract

The invention relates to a negative resistance temperature coefficient zinc oxide linear resistance ceramic material and a preparation method, which belong to the technical field of functional ceramic material manufacture. The negative resistance temperature coefficient zinc oxide linear resistance ceramic material is characterized by comprising, by mole percentage, zinc oxide 90%-95%, magnesium oxide 1.0%-3.0%, aluminum oxide 3.0%-5.0% and metasilicic acid 1.0%-3.0%. By adjusting reasonable proportion of functional additives and adopting the negative resistance temperature coefficient zinc oxide linear resistance ceramic material prepared by a high energy grinding preparation technology, products have excellent comprehensive performance, the optimal nonlinearity coefficient can reach 1.0, the dielectric property can be stable in a high frequency region, the dielectric constant is in a range of 0.6*104-1*104, the resistivity is 40-50 ohm / centimeter, the temperature resistance coefficient is in a range from -3.7*10-3 to -3.6*10-3 ohm / DEG C.

Description

technical field [0001] The invention relates to a zinc oxide linear resistance ceramic material with a negative temperature coefficient of resistance and a preparation method thereof, belonging to the technical field of functional ceramic material manufacturing. Background technique [0002] Zinc oxide linear resistance is a functional material based on the zinc oxide-magnesium oxide-alumina ternary system; Chinese patent No. 96123503.9 discloses a zinc oxide ceramic linear resistance and its manufacturing method. The new ceramic resistance prepared by this method has Good anti-surge ability, its voltage nonlinear coefficient is 1.26, which is obviously high, and its resistance temperature coefficient is 4.5×10 -2 Ohm / °C is a positive value, so its application field is greatly limited; Chinese patent No. 02140486.0 also discloses a zinc oxide ceramic linear resistor and its manufacturing method. The new ceramic resistor prepared by this method has better voltage Non-linear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622
Inventor 程晓农徐东赵国平
Owner JIANGSU UNIV
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