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Ceramic dielectric material with negative temperature coefficient and preparation method thereof

A negative temperature coefficient, ceramic dielectric technology, applied in the field of ceramic dielectric materials, can solve problems such as increase and decrease in actual capacitance, and achieve the effects of high reliability, improved reliability, stability and good reproducibility

Active Publication Date: 2019-04-16
TAIYUAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This temperature rise results in a decrease or increase in the actual capacitance

Method used

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  • Ceramic dielectric material with negative temperature coefficient and preparation method thereof
  • Ceramic dielectric material with negative temperature coefficient and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1: a kind of negative temperature coefficient ceramic dielectric material is characterized in that: by the CaTiO of 10% by weight percentage 3 and 90% by weight of K 2 Sr 4 (Nb 8 Mg 2 )O 27 composition.

[0018] The specific preparation method is: the raw material K 2 CO 3 , MgO, SrCO 3 and Nb 2 o 5 According to formula K 2 Sr 4 (Nb 8 Mg 2 )O 27 , for batching, ball milling on a ball mill with a speed of 400r / min for 6 hours, drying in a 3.3kw ordinary oven at 100°C for 4 hours, passing through 250 holes / cm 2 Sieve the sample, raise the temperature to 1050°C at 5°C / min, and keep the temperature at 1050°C for 3 hours to obtain frit A.

[0019] For secondary batching, according to 90% frit A and 10% CaTiO 3 Mix evenly, add 100ml of deionized water, mill on a ball mill at a speed of 400r / min for 8 hours, dry at 120°C for 4 hours, pass through 250 holes / cm 2 Sampling sieve, add 8wt% paraffin wax to granulate, press into a green body, first heat t...

Embodiment 2

[0021] Embodiment 2: a kind of negative temperature coefficient ceramic dielectric material is characterized in that: by the CaTiO of 20% by weight percentage 3 and 80% by weight of K 2 Sr 4 (Nb 8 Mg 2 )O 27 composition.

[0022] The specific preparation method is: the raw material K 2 CO 3 , MgO, SrCO 3 and Nb 2 o 5 According to formula K 2 Sr 4 (Nb 8 Mg 2 )O 27 , for batching, ball milling on a ball mill with a rotational speed of 400r / min for 5 hours, drying in a 3.3kw ordinary oven at 100°C for 4 hours, passing through 200 holes / cm 2 Sieve the sample, raise the temperature to 1070°C at 7°C / min, and keep it at 1070°C for 2 hours to obtain frit A.

[0023] For secondary batching, according to 80% frit A and 20% CaTiO 3 Mix evenly, add 100ml of deionized water, mill on a ball mill at a speed of 400r / min for 8 hours, dry at 120°C for 4 hours, pass through 200 holes / cm 2 Separating sieve, add 6.5wt% paraffin wax to granulate, press into green body, firstly heat...

Embodiment 3

[0025] Embodiment 3: a kind of negative temperature coefficient ceramic dielectric material is characterized in that: by the CaTiO of 30% by weight percentage 3 and 70% by weight of K 2 Sr 4 (Nb 8 Mg 2 )O 27 composition.

[0026] The specific preparation method is: the raw material K 2 CO 3 , MgO, SrCO 3 and Nb 2 o 5 According to formula K 2 Sr 4 (Nb 8 Mg 2 )O 27 , for batching, ball milling on a ball mill with a speed of 400r / min for 4 hours, drying in a 3.3kw ordinary oven at 100°C for 4 hours, passing through 120 holes / cm 2 Sieve the sample, raise the temperature to 1100°C at 10°C / min, and keep it at 1100°C for 4 hours to obtain frit A.

[0027] For secondary batching, according to 70% frit A and 30% CaTiO 3 Mix evenly, add 100ml of deionized water, mill on a ball mill at a speed of 400r / min for 8 hours, dry at 120°C for 4 hours, pass through 120 holes / cm 2 Sieve the sample, add 5wt% polyvinyl alcohol to granulate, press into a green body, first heat to 500...

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Abstract

The invention belongs to the technical field of ceramic dielectric materials, and provides a ceramic dielectric material with a negative temperature coefficient and a preparation method thereof in order to prevent the capacitance of a capacitor from increasing due to a temperature rise or other factors in the use process of the capacitor and improve the reliability. The ceramic dielectric materialcomprises 10-30wt% of CaTiO3 and 70-90wt% of K2Sr4 (Nb8Mg2) O27. The ceramic dielectric material meets the EIAX7R standard, the capacitance change rate in the temperature range of 55 DEG C to 125 DEGC does not exceed + / -15%. The ceramic dielectric material has a good dielectric property, the dielectric constant can reach about 4700 at the temperature of 25 DEG C, and the loss is 0.0065. The ceramic dielectric material has a negative capacitance temperature coefficient, compensates for the increase of capacitance caused by the temperature rise or other factors, and improves the reliability. The ceramic dielectric material has the advantages of wide sintering temperature range, adjustable performances, good stability and reproducibility, high reliability, and environmental friendliness, moreover, the ceramic dielectric material does not contain any harmful substances such as heavy metal.

Description

technical field [0001] The invention belongs to the technical field of ceramic dielectric materials, and in particular relates to a negative temperature coefficient ceramic dielectric material and a preparation method thereof. Background technique [0002] Chip Multilayer Ceramic Capacitor (MLCC) is one of the three major passive electronic components. It, together with chip inductors and chip resistors, constitutes an indispensable basic passive component in the electronic information industry. MLCC has the advantages of compact structure, high specific volume, small volume, low loss, and low price. In addition to being widely used in civil electronic equipment such as mobile communications, radio and television, household appliances, home computers, medical equipment, and measuring instruments, MLCC is also used in aerospace , Military mobile communications, tank electronics, military signal monitoring and weapon warhead control and other military electronic equipment and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/3201C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3236C04B2235/6562C04B2235/6567C04B2235/96
Inventor 郭雅晶张永强马会芳
Owner TAIYUAN NORMAL UNIV
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