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Thermal sensitive ceramic material with low electrical resistivity and negative temperature coefficient and preparation method thereof

A negative temperature coefficient, low resistivity technology, applied in the field of ceramic materials, can solve the problems of reducing resistivity, low resistivity, reducing B value, etc., to achieve the effect of reducing porosity, small resistivity, and low resistivity

Inactive Publication Date: 2016-07-13
刘操
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to increase the B value of heat-sensitive materials and reduce the material resistance, precious metals, such as Au, Pt, and Pa, have been mixed into the transition metal oxide material formula to reduce the resistivity of the material by using the shunt effect of metal ions, but as the material resistivity The B value drops significantly, and the B value of the material with a resistivity of 5Ωcm can only reach 2600K
Later, someone added some low-priced metals such as K, Na, and Ca oxides to the material formula, which also reduced the resistivity and B value, and could not achieve the low resistivity and high B value heat-sensitive materials required by the application.

Method used

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  • Thermal sensitive ceramic material with low electrical resistivity and negative temperature coefficient and preparation method thereof
  • Thermal sensitive ceramic material with low electrical resistivity and negative temperature coefficient and preparation method thereof
  • Thermal sensitive ceramic material with low electrical resistivity and negative temperature coefficient and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A thermosensitive ceramic material with a low negative temperature coefficient of resistivity, the raw materials according to parts by weight include: Mn 3 o 4 : 30 copies, Co 3 o 4 : 35 parts, CuO: 20 parts, La 2 o 3 : 10 parts, CaO: 5 parts, MnO 2 : 35 parts, Ni 2 o 3 : 30 parts, Fe 2 o 3 : 0.24 parts, C: 0.15 parts, TiO 2 : 0.21 parts, Cr 2 o 3 : 0.09 parts, Nb 2 o 5 : 0.05 parts, Nd 2 o 3 : 0.05 parts.

[0024] The preparation method of the heat-sensitive ceramic material with a negative temperature coefficient of low resistivity, the specific steps are as follows:

[0025] (1) Firstly, La 2 o 3 , CaO, MnO 2 、Ni 2 o 3 As a raw material, it was weighed according to the atomic percentage of the perovskite phase LaCaMnO and the atomic percentage of the spinel phase NiMnO, respectively, and placed in an agate ball mill jar, and water was used as the dispersion medium for wet grinding for 8 hours to obtain the first ball mill ;

[0026] (2) Fe 2 o...

Embodiment 2

[0042] A thermosensitive ceramic material with a low negative temperature coefficient of resistivity, the raw materials according to parts by weight include: Mn 3 o 4 : 32 copies, Co 3 o 4 : 36 parts, CuO: 21 parts, La 2 o 3 : 12 parts, CaO: 6 parts, MnO 2 : 38 copies, Ni 2 o 3 : 32 parts, Fe 2 o 3 : 0.28 parts, C: 0.18 parts, TiO 2 : 0.25 parts, Cr 2 o 3 : 0.11 parts, Nb 2 o 5 : 0.052 parts, Nd 2 o 3 : 0.055 parts.

[0043] The preparation method of the heat-sensitive ceramic material with a negative temperature coefficient of low resistivity, the specific steps are as follows:

[0044] (1) Firstly, La 2 o 3 , CaO, MnO 2 、Ni 2 o 3 As a raw material, it was weighed according to the atomic percentage of the perovskite phase LaCaMnO and the atomic percentage of the spinel phase NiMnO, respectively, and placed in an agate ball mill jar, and water was used as the dispersion medium for wet grinding for 8 hours to obtain the first ball mill ;

[0045] (2) Fe ...

Embodiment 3

[0062] A thermosensitive ceramic material with a low negative temperature coefficient of resistivity, the raw materials according to parts by weight include: Mn 3 o 4 : 35 copies, Co 3 o 4 : 38 parts, CuO: 22 parts, La 2 o 3 : 15 parts, CaO: 8 parts, MnO 2 : 40 parts, Ni 2 o 3 : 35 parts, Fe 2 o 3 : 0.32 parts, C: 0.2 parts, TiO 2 : 0.28 parts, Cr 2 o 3 : 0.12 parts, Nb 2 o 5 : 0.055 parts, Nd 2 o 3 : 0.06 parts.

[0063] The preparation method of the heat-sensitive ceramic material with a negative temperature coefficient of low resistivity, the specific steps are as follows:

[0064] (1) Firstly, La 2 o 3 , CaO, MnO 2 、Ni 2 o 3 As a raw material, it was weighed according to the atomic percentage of the perovskite phase LaCaMnO and the atomic percentage of the spinel phase NiMnO, respectively, and placed in an agate ball mill jar, and water was used as the dispersion medium for wet grinding for 8 hours to obtain the first ball mill ;

[0065] (2) Fe 2 o...

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Abstract

The invention discloses a thermal sensitive ceramic material with low electrical resistivity and a negative temperature coefficient and a preparation method thereof. The thermal sensitive ceramic material is prepared from the following raw materials in parts by weight: 30-40 parts of Mn3O4, 35-40 parts of Co3O4, 20-25 parts of CuO, 10-20 parts of La2O3, 5-10 parts of CaO, 35-45 parts of MnO2, 30-40 parts of Ni2O3, 0.24-0.4 part of Fe2O3, 0.15-0.25 part of C, 0.21-0.35 part of TiO2, 0.09-0.15 part of Cr2O3, 0.05-0.06 part of Nb2O5 and 0.05-0.07 part of Nd2O3. The obtained thermal sensitive ceramic material is capable of achieving relatively small electrical resistivity under a condition of slightly influencing a material constant B value, reducing the porosity, and improving the pulse performance of the material in a situation of inhibiting a surge current field.

Description

technical field [0001] The invention relates to a ceramic material, in particular to a thermosensitive ceramic material with low resistivity and negative temperature coefficient and a preparation method thereof. Background technique [0002] Negative temperature coefficient (NTC) thermistor, because of its high temperature measurement accuracy, good interchangeability, high reliability, and low cost, has been widely used in temperature measurement, control, compensation, and remote control of communication equipment. It is widely used, and it is considered to be an electronic component with great development potential and has a good application prospect. Usually the AB2O4 type spinel structure is the main crystal phase of NTC heat-sensitive ceramic materials. With the development of technology and demand, the limitations of this type of material are becoming more and more prominent. When the resistivity of the material is high, its B value is also high, and vice versa. At t...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/622H01C7/04
CPCC04B35/01C04B35/622C04B2235/3208C04B2235/3224C04B2235/3227C04B2235/3232C04B2235/3241C04B2235/3251C04B2235/3263C04B2235/3267C04B2235/3272C04B2235/3277C04B2235/3279C04B2235/3281C04B2235/422C04B2235/763C04B2235/768H01C7/043
Inventor 刘操
Owner 刘操
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