PTCR ceramic material and preparation method and application thereof

A technology of ceramic materials and raw materials, which is applied in the field of preparation and PTCR ceramic materials, can solve the problems of low temperature coefficient of resistance jump ratio, high Curie temperature of PTCR ceramics, which affect the application of PTCR devices, etc. The effect of low internal temperature and high withstand voltage strength

Active Publication Date: 2017-10-03
TONGREN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] However, the Curie temperature of the existing PTCR ceramics is high, which cannot meet the needs of people's daily life. In addition, the resistance jump ratio (ie the ratio of the maximum resistance to the minimum resistance) and the temperature coefficient of resistance are low, which affects the PTCR device. Applications in more fields

Method used

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  • PTCR ceramic material and preparation method and application thereof
  • PTCR ceramic material and preparation method and application thereof

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preparation example Construction

[0049] In the second aspect, the present invention provides a method for preparing a PTCR ceramic material, comprising the following steps: batching, pre-synthesis, molding and sintering. The above preparation method is simple and easy to implement, and the PTCR ceramic material prepared by the method has the characteristics of low Curie temperature, high resistance jump ratio, high temperature coefficient of resistance and high withstand voltage strength.

[0050]In a preferred embodiment, the batching is to weigh the amount of raw materials according to the general formula, and the raw materials are TiO 2 , CaCO 3 , SrCO 3 、BaCO 3 and M and N, where M is Y 2 o 3 、 Bi 2 o 3 , La 2 o 3 、Sm 2 o 3 , Nb 2 o 5 、 Ta 2 o 5 and Sb 2 o 5 Any one or a combination of at least two, N is MnO 2 , CuO, Fe 2 o 3 , ZrO 2 、Al 2 o 3 , SiO 2 、TiO 2 , BN and B 2 o 3 Any one or a combination of at least two of them.

[0051] Preferably, the pre-synthesis includes firstly...

Embodiment 1

[0064] A kind of PTCR ceramic material, its composition formula is 0.6 (BaTiO 3 )-0.1(SrTiO 3 )-0.3(CaTiO 3 )+0.1mol%Sm 2 o 3 .

Embodiment 2

[0072] A kind of PTCR ceramic material, its composition formula is 0.6 (BaTiO 3 )-0.1(SrTiO 3 )-0.3(CaTiO 3 )+0.15mol%Sm 2 o 3 +0.5mol%Fe 2 o 3 .

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Abstract

The invention relates to the field of electronic ceramics and provides a PTCR ceramic material and a preparation method and application thereof. The PTCR ceramic material has a general formula x(BaTiO3)-y(SrTiO3)-(1-x-y)(CaTiO3)+a mol% M+b mol% N, x is greater than or equal to 0.6 and less than or equal to 0.9, y is greater than or equal to 0.1 and less than or equal to 0.4, a is greater than or equal to 0.1 and less than or equal to 1, b is greater than or equal to 0 and less than or equal to 3, the sum of x and y is less than or equal to 1, M represents any one or more of Y2O3, Bi2O3, La2O3, Sm2O3, Nb2O5, Ta2O5 and Sb2O5, and N represents any one or more of MnO2, CuO, Fe2O3, ZrO2, Al2O3, SiO2, TiO2, BN and B2O3. The PTCR ceramic material has the advantages of low Curie temperature, high resistance abrupt change ratio and high resistance temperature coefficient.

Description

technical field [0001] The invention relates to the field of electronic ceramics, in particular to a PTCR ceramic material, a preparation method and an application thereof. Background technique [0002] PTCR (positive temperature coefficient resistivity) is a positive temperature coefficient thermistor, which has the characteristic that the resistivity increases sharply with the increase of temperature. It has both semiconducting properties and ferroelectricity, that is, the grains have semiconducting properties, and the ferroelectric grains near the Curie temperature (Tc) undergo a phase transition, forming a potential barrier in the grain boundary region, blocking electron conduction, resulting in resistance There will be drastic changes, so it can generate feedback on heating, automatically adjust the working current, not only save power, but also stabilize the temperature. Because this kind of high-power semiconductor electrothermal ceramics is safe and reliable when wo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/49C04B35/622H01C7/02
CPCC04B35/4682C04B35/49C04B35/622C04B2235/3208C04B2235/3213C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3251C04B2235/3267C04B2235/3272C04B2235/3281C04B2235/3294C04B2235/3298C04B2235/3409C04B2235/3418C04B2235/386C04B2235/656H01C7/025
Inventor 冷森林石维黄伟张仁辉张橘王松
Owner TONGREN UNIV
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