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PTCR (Positive temperature coefficient of resistance) ceramic material, and a preparation method and application thereof

A ceramic material and ceramic technology, applied in the field of ceramic materials, can solve the problems of human health hazards, Pb is volatile, and low Curie temperature, and achieve the effects of good uniformity, low sintering temperature, and high Curie temperature

Pending Publication Date: 2019-05-28
TONGREN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, PTCR materials require a high Curie temperature, and BaTiO 3 The Curie temperature itself is low (Tc≈120°C). In order to increase the Curie temperature of the material, doping an appropriate amount of lead (Pb) in the material can move the Curie temperature to a high temperature, but because Pb is sintered It is easy to volatilize during the process, causing environmental pollution and harming human health. Therefore, the preparation of green and environmentally friendly lead-free PTCR ceramics is the development trend of the electronic ceramics industry in the future, and its market prospects are bright.
[0003] However, the existing lead-free PTCR ceramics have the problem of low Curie temperature, and often need to add more Bi 0.5 Na 0.5 TiO 3 to further increase the Curie temperature

Method used

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  • PTCR (Positive temperature coefficient of resistance) ceramic material, and a preparation method and application thereof
  • PTCR (Positive temperature coefficient of resistance) ceramic material, and a preparation method and application thereof
  • PTCR (Positive temperature coefficient of resistance) ceramic material, and a preparation method and application thereof

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preparation example Construction

[0022] A kind of preparation method of PTCR ceramic material that the embodiment of the present invention provides, it comprises the following steps:

[0023] S1, material preparation

[0024] Using barium salt, sodium salt, bismuth salt, yttrium salt and titanium salt as raw materials, the ceramic material is prepared by sol-gel method. Among them, barium salts, sodium salts, bismuth salts, yttrium salts and titanium salts are organic salts, and the expected ceramic materials cannot be obtained by using inorganic salts, which may be due to insufficient reaction of the solution.

[0025] During actual weighing, the amount ratio of barium salt, sodium salt, bismuth salt, yttrium salt and titanium salt is weighed according to the ratio of each component in the pre-prepared ceramic material. The chemical formula of the ceramic material is: (1-x)BaTiO 3 -xBi 0.5 Na 0.5 TiO 3 +M mol%Y; wherein, 0<x≤0.2, 0<M≤0.4; preferably, 0.06<x≤0.15, 0.05<M≤0.24.

[0026] Specifically, bari...

Embodiment 1

[0047] The present embodiment provides a kind of preparation method of PTCR ceramic material, it comprises the following steps:

[0048] (1) Using barium acetate, bismuth acetate, sodium acetate, yttrium acetate, tetra-n-butyl titanate, acetic acid, ethylene glycol methyl ether as raw materials, according to the designed formula 0.85BaTiO 3 -0.15Bi 0.5 Na 0.5 TiO 3 +0.24mol% Y calculation and weighing.

[0049] (2) Add the weighed barium salt, sodium salt, bismuth salt, and yttrium salt into acetic acid solvent in a beaker.

[0050] (3) Add the weighed titanium salt into the ethylene glycol methyl ether solvent in the beaker b.

[0051] (4) The temperature of a beaker is raised to 30° C. and magnetically stirred for 50 minutes until it is completely dissolved.

[0052] (5) Magnetically stir the beaker at 30°C for 50 minutes until the solution becomes clear and transparent.

[0053] (6) Cool the mixed salt solution in the beaker of a to room temperature, and while stirrin...

Embodiment 2

[0059] The present embodiment provides a kind of preparation method of PTCR ceramic material, it comprises the following steps:

[0060] (1) Using barium acetate, bismuth acetate, sodium acetate, yttrium acetate, tetra-n-butyl titanate, acetic acid, and ethylene glycol methyl ether as raw materials, according to the designed formula 0.94BaTiO 3 -0.06Bi 0.5 Na 0.5 TiO 3 +0.05mol% Y calculation and weighing.

[0061] (2) Add the weighed barium salt, sodium salt, bismuth salt, and yttrium salt into acetic acid solvent in a beaker.

[0062] (3) Add the weighed titanium salt into the ethylene glycol methyl ether solvent in the beaker b.

[0063] (4) The temperature of a beaker is raised to 25° C. and magnetically stirred for 60 minutes until it is completely dissolved.

[0064] (5) Magnetically stir the beaker at 25°C for 60 minutes until the solution becomes clear and transparent.

[0065] (6) Cool the mixed salt solution in the beaker of a to room temperature, and while sti...

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Abstract

The invention discloses a PTCR (Positive temperature coefficient of resistance) ceramic material, and a preparation method and application thereof, and relates to the technical field of ceramic materials. The preparation method of the PTCR ceramic material comprises the following steps: performing standing reaction on reaction system liquid obtained by mixing and dissolving a barium salt, a sodiumsalt, a bismuth salt, an yttrium salt, a titanium salt and an organic solvent to form sol mixed liquid; drying the sol mixed liquid to obtain a ceramic green body; sintering the ceramic green body ina reducing atmosphere and an oxidizing atmosphere, wherein the barium salt, sodium salt, bismuth salt, yttrium salt and titanium salt are organic salts. The ceramic material is prepared by the preparation method, the Curie temperature of the ceramic material is within the range of 140-200 DEG C, the room temperature resistivity is approximately 100-10000 omega.cm, and the resistance jump ratio is2-4 orders of magnitude, and the ceramic material can be applied to preparation of heating elements of electrical components.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, and in particular to a PTCR ceramic material, its preparation method and application. Background technique [0002] BaTiO 3 Positive temperature coefficient of resistance (PTCR) ceramics is a typical temperature-sensitive material in semiconductor resistors. The relationship between the resistivity of the material and the temperature increases exponentially. When the temperature of the material increases to a certain value ( After the Curie temperature Tc), the resistance begins to change abruptly. This special property makes PTCR thermosensitive ceramic materials can be manufactured into small heating components, constant temperature heating resistors, constant current components, etc. In practical applications, PTCR materials require a high Curie temperature, and BaTiO 3 The Curie temperature itself is low (Tc≈120°C). In order to increase the Curie temperature of the material, dopi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622C04B35/624C04B35/64H05B3/10H05B3/14
Inventor 冷森林石维
Owner TONGREN UNIV