A kind of negative temperature coefficient ceramic dielectric material and preparation method thereof

A negative temperature coefficient and ceramic dielectric technology, applied in the field of ceramic dielectric materials, can solve the problems of actual capacitance reduction and increase, and achieve the effect of compensating for capacitance increase, high dielectric constant, and high dielectric constant

Active Publication Date: 2021-06-22
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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  • A kind of negative temperature coefficient ceramic dielectric material and preparation method thereof
  • A kind of negative temperature coefficient ceramic dielectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
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 Sample sieve, add 8wt% paraffin wax to granulate, press into green body, first heat up to...

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 negative temperature coefficient ceramic dielectric material and a preparation method thereof in order to prevent the capacitor from increasing in capacitance due to temperature rise or other factors during use and to improve reliability. 10‑30% by weight of CaTiO 3 and 70‑90% by weight of K 2 Sr 4 (Nb 8 Mg 2 )O 27 composition. Conforms to EIA X7R standard, and the capacitance change rate within the temperature range of -55°C to 125°C does not exceed ±15%. It has good dielectric properties, the dielectric constant can reach about 4700 at 25°C, and the loss is 0.0065. It has a negative capacitance temperature coefficient, which can compensate for the increase in capacitance caused by temperature rise or other factors, and improve reliability. The sintering temperature range is wide, the performance is adjustable, the stability and reproducibility are good, and the reliability is high. It does not contain harmful substances such as heavy metals, and is environmentally friendly.

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 Patents(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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