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Thermal sensitive ceramic resistance material, resistance element and preparation method of resistance element

A technology of heat-sensitive ceramics and resistance materials, applied in the direction of resistors with negative temperature coefficient, etc., can solve the problems affecting the performance and service life of materials, unstable electrical properties, material aging, etc., to achieve good product composition consistency, It is beneficial to mass production and improves the stability of material properties

Inactive Publication Date: 2009-11-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This relaxation phenomenon causes the instability of the electrical properties of the NTC ceramic material, which easily leads to the aging of the material and affects the performance and service life of the material.

Method used

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  • Thermal sensitive ceramic resistance material, resistance element and preparation method of resistance element
  • Thermal sensitive ceramic resistance material, resistance element and preparation method of resistance element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This example according to molecular formula BaTi 1-x Fe x o 3 Dosing, x=0.1. The initial raw material is selected from barium carbonate (BaCO 3 ), tetra-n-butyl titanate ([CH 3 (CH 2 ) 3 O] 4 Ti), ferric oxide (Fe 2 o 3 ). Materials were prepared according to the following experimental process steps:

[0032] Press the initial raw material as BaTi 0.9 Fe 0.1 o 3 Formula ingredients, weigh 77.71g BaCO 3 , 119.74g[CH 3 (CH 2 ) 3 O] 4 Ti, 3.15g Fe 2 o 3 .

[0033] The raw materials weighed in the previous step were dissolved in 6mol / L dilute nitric acid respectively.

[0034] Mix the three solutions prepared in the previous step together, stir and mix evenly with a magnetic stirring heater, and heat and dry.

[0035] The powder obtained in the previous step is calcined at a temperature of 1000°C and kept for 2 hours.

[0036] The powder synthesized in the previous step is granulated and pressed into a green body; the green body is in the shape of a d...

Embodiment 2

[0043] This example according to molecular formula BaTi 1-x Fe x o 3 Dosing x = 0.2. The initial raw material is selected from BaCO 3 、[CH 3 (CH 2 ) 3 O] 4 Ti, Fe 2 o 3 . Materials were prepared according to the following experimental process steps:

[0044] ① Press the initial raw material to BaTi 0.8 Fe 0.2 o 3 Formula ingredients, weigh 81.13g BaCO 3 , 112.14g[CH 3 (CH 2 ) 3 O] 4 Ti, 6.64g Fe 2 o 3 .

[0045] ②The preparation process is the same as the steps ②~⑨ in Example 1.

[0046] X-ray diffraction analysis of the as-prepared material figure 1 In sample 2, the material performance test results are shown in Table 1 and figure 2 shown.

Embodiment 3

[0048] This example according to molecular formula BaTi 1-x Fe x o 3 Dosing, x=0.3. The initial raw material is selected from BaCO 3 、[CH 3 (CH 2 ) 3 O] 4 Ti, Fe 2 o 3 . Materials were prepared according to the following experimental process steps:

[0049] ① Press the initial raw material to BaTi 0.7 Fe 0.3 o 3 Formula ingredients, weigh 85.89g BaCO 3 , 103.69g[CH 3 (CH 2 ) 3 O] 4 Ti, 10.53g Fe 2 o 3 .

[0050] ②The preparation process is the same as the steps ②~⑨ in Example 1.

[0051] X-ray diffraction analysis of the as-prepared material figure 1 In sample 3, the material performance test results are shown in Table 1 and figure 2 shown.

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Abstract

The invention discloses a thermal sensitive ceramic resistance material, a resistance element and a preparation method of the resistance element. The thermal sensitive ceramic resistance material is formed by iron doped with BaTiO3, and the molecular formula is BaTi FeO3; wherein x equals to 0.1 to 1; and the principal crystalline phase of the material is a hexagonal structure. The material of the invention is characterized by simple component design, wide regulating range of components and wide source of raw materials and is suitable for the preparation techniques of multiple ceramic materials; the material only contains one transition metal element of iron and the sintering temperature is lower than the volatilization temperature of the ferriferous oxide, thus effectively avoiding the volatilization problem of the principal component elements at high temperature in the preparation process. The material of the invention has good material constant value, is characterized by good stability, good consistency, good repetitiveness and controllable electrical characteristics such as resistance value, material constant, resistance temperature coefficient and the like, and is applicable to the temperature measurement, control and circuit compensation of automobiles, refrigerators and the like.

Description

technical field [0001] This patent belongs to the field of material engineering, and relates to a heat-sensitive ceramic resistance material, a resistance element and a preparation method of the resistance element. The material is an iron-doped BaTiO with a hexagonal crystal structure. 3 Thermosensitive ceramic materials with negative temperature coefficient (NTC) effect of resistance. Background technique [0002] The thermal sensor is an electronic device made of the characteristic that the resistivity of the material changes with temperature, which includes a positive temperature coefficient (PTC) thermistor element whose resistivity increases with temperature, or a resistivity that increases with temperature. Reduced negative temperature coefficient (NTC) thermistor element. NTC thermistor components and devices have been widely used in temperature measurement, control, temperature compensation, protection of circuits and electronic components, and related instruments a...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/26C04B35/622H01C7/04
Inventor 李志成张鸿汪健薛丹
Owner CENT SOUTH UNIV
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