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PTC thermal sensitive ceramic material and method for preparing the same

A heat-sensitive ceramic and a common technology, applied in the field of PTC heat-sensitive ceramic materials, can solve the problems of high room temperature resistivity, etc., achieve a large temperature coefficient of resistance, reduce room temperature resistivity, and promote sintering effects

Inactive Publication Date: 2009-02-04
周金平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency that the room temperature resistivity of the existing PTC thermosensitive ceramic material is too large, the present invention provides a PTC thermosensitive ceramic material with a small room temperature resistivity and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A PTC thermosensitive ceramic material consists of the following components:

[0011] 45 parts by mole of BaCO 3 ;

[0012] The molar fraction is 15 parts of PbO;

[0013] 1 part by mole of CaCO 3 ;

[0014] TiO with a mole fraction of 61 2 ;

[0015] 0.4 parts by mole of Nb 2 o 5 ;

[0016] MnCO with a mole fraction of 0.03 3 ;

[0017] The molar fraction is 0.3 parts of BN.

[0018] Its preparation method comprises the following steps:

[0019] a. Mix the above raw material components together according to the proportion, carry out wet mixing, and mix evenly.

[0020] b. The homogeneously mixed mixture is dehydrated and dried, then calcined and then mixed with a binder for granulation. Wherein the calcining time is 1 hour, and the calcining temperature is 1100 DEG C; Select polyvinyl alcohol as binder in the present embodiment, the weight ratio of solid polyvinyl alcohol and raw material is 1: 100; When adding polyvinyl alcohol, first polyvinyl alcohol I...

Embodiment 2

[0023] A PTC thermosensitive ceramic material consists of the following components:

[0024] BaCO with a mole fraction of 87 3 ;

[0025] The molar fraction is 20 parts of PbO;

[0026] 2.5 parts by mole of CaCO 3 ;

[0027] TiO with a mole fraction of 109.5 2 ;

[0028] 0.25 parts by mole of Nb 2 o 5 ;

[0029] MnCO with a mole fraction of 0.07 3 ;

[0030] The mole fraction is 0.1 part of BN.

[0031] Its preparation method comprises the following steps:

[0032] a. Mix the above raw material components together according to the proportion, carry out wet mixing, and mix evenly.

[0033] b. The homogeneously mixed mixture is dehydrated and dried, then calcined and then mixed with a binder for granulation. Wherein the calcining time is 1.2 hours, and the calcining temperature is 1200 DEG C; Select polyvinyl alcohol as binder in the present embodiment, the weight ratio of solid polyvinyl alcohol and raw material is 1: 100; When adding polyvinyl alcohol, first polyv...

Embodiment 3

[0036] A PTC thermosensitive ceramic material consists of the following components:

[0037] 50 parts by mole of BaCO 3 ;

[0038] The molar fraction is 8 parts of PbO;

[0039] 1.5 molar parts of CaCO 3 ;

[0040] TiO with a mole fraction of 59.5 parts 2 ;

[0041] 0.2 parts by mole of Nb 2 o 5 ;

[0042] MnCO with a mole fraction of 0.04 3 ;

[0043] The molar fraction is 0.5 parts of BN.

[0044] Its preparation method comprises the following steps:

[0045] a. Mix the above raw material components together according to the proportion, carry out wet mixing, and mix evenly.

[0046] b. The homogeneously mixed mixture is dehydrated and dried, then calcined and then mixed with a binder for granulation. Wherein the calcining time is 1.5 hours, and the calcining temperature is 1100 DEG C; Select polyvinyl alcohol as binder in the present embodiment, the weight ratio of solid polyvinyl alcohol and raw material is 1: 100; When adding polyvinyl alcohol, first polyvinyl...

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Abstract

The invention provides a PTC heat sensitive ceramic material which consists of the following components according to molecular fraction: 45 to 87 parts of BaCO3, 8 to 40 parts of PbO, 1 to 5 parts of CaCO3, TiO2, the molecular fraction of which is the sum of the parts of the BaCO3, PbO and CaCO3, 0.1 to 0.5 part of Nb2O5, 0.02 to 0.08 part of MnCO3 and o.1 to 0.6 part of BN. The preparation method of the ceramic material comprises the following steps: a. wet mixing; b. after dehydrating, drying and sintering, then adding an adhesive for granulating; c. sheet pressing, sintering in the air and natural cooling. The PTC heat sensitive ceramic material can obtain higher static bearable voltage and larger temperature coefficient of resistance and greatly reduce the room temperature resistivity.

Description

(1) Technical field [0001] The invention relates to a PTC thermosensitive ceramic material. (2) Background technology [0002] Existing PTC heat-sensitive ceramic materials are generally modified PTC heat-sensitive ceramic materials, with BaCO 3 , PbO, CaCO 3 、TiO 2 , MnCO 3 As raw material, with Nb 2 o 5 As a semiconductor forming agent, SiO 2 as modifier. Although existing PTC thermosensitive ceramic materials use SiO 2 As a modifier, PTC thermosensitive ceramics can obtain a static withstand voltage of 100V / mm or greater and a temperature coefficient of resistance of 10% / °C or greater, but its room temperature resistivity is too large to meet some specific requirements . (3) Contents of the invention [0003] In order to overcome the deficiency that the room temperature resistivity of the existing PTC thermosensitive ceramic material is too large, the invention provides a PTC thermosensitive ceramic material with a small room temperature resistivity and a prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 周金平
Owner 周金平
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