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Thermal sensitive ceramic material with low resistivity, high B value and negative temperature coefficient and preparation method thereof

A technology with negative temperature coefficient and low resistivity, which is applied in the field of negative temperature coefficient heat-sensitive ceramic materials, can solve problems such as unsatisfactory, high resistivity, and low resistance value requirements, and achieve reduced porosity, small resistivity, and improved pulse rate. performance effect

Active Publication Date: 2014-12-10
SHANTOU XINCHENG ELECTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The publication number is CN102249648B, and the name is "a magnesium-containing quaternary negative temperature coefficient thermistor material". Although the material constant B of the disclosed NTC thermistor is 3630-3720K, its resistivity reaches ρ 25℃ =1270-3522Ω·cm, the resistivity is relatively large, which cannot meet the requirement of lower resistance value at room temperature

Method used

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  • Thermal sensitive ceramic material with low resistivity, high B value and negative temperature coefficient and preparation method thereof
  • Thermal sensitive ceramic material with low resistivity, high B value and negative temperature coefficient and preparation method thereof
  • Thermal sensitive ceramic material with low resistivity, high B value and negative temperature coefficient and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] Using industrially pure MnO 2 , NiO, CuO, ZnO, Nb 2 o 5 with analytically pure Y 2 o 3 、Nd 2 o 3 The powder is used as the raw material, and the distribution ratio of each composition is as shown in Table 1. A total of 16 groups of samples are produced, and the negative temperature coefficient thermistor is prepared according to the following steps:

[0036] a. Weigh industrially pure main component MnO according to Table 1 2 , NiO, CuO and ZnO, put the powder in a polytetrafluoroethylene ball mill tank, add zirconium balls and deionized water, raw materials: ball: water = 1:1:1.5, use a planetary ball mill for ball milling, the speed is 250r / min, time 2h.

[0037] b. Dry the uniformly mixed slurry obtained in step a at 150°C, grind it evenly, place it in an alumina crucible, and pre-fire it at 950°C for 2.5 hours to obtain a powder with a spinel phase after pre-calcination .

[0038] c. The pre-fired powder is mixed with Y 2 o 3 , Nb 2 o 5 、Nd 2 o 3 , b...

Embodiment 2

[0057] The present embodiment adopts the same formula as the sample 111 in Example 1 (see Table 1), and prepares a negative temperature coefficient thermistor according to the following steps:

[0058] a. Weigh industrial pure main component MnO 2 , NiO, CuO and ZnO, put the powder in a polytetrafluoroethylene ball mill tank, add zirconium balls and deionized water, raw materials: ball: water = 1:1:1.5, use a planetary ball mill for ball milling, the speed is 250r / min, time 3h.

[0059] b. Dry the homogeneously mixed slurry obtained in step a at 180°C, grind it evenly, place it in an alumina crucible, and pre-fire at 930°C for 3 hours to obtain a powder with a spinel phase after pre-calcination.

[0060] c. The pre-fired powder is mixed with Y 2 o 3 , Nb 2 o 5 、Nd 2 o 3 , ball milled for 1 hour, dried and ground to obtain a uniformly mixed powder, added a polyvinyl alcohol solution with a concentration of 10wt%, and the added amount was 8wt% of the raw material, mixed ...

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Abstract

The invention discloses a thermal sensitive ceramic material with low resistivity, high B value and negative temperature coefficient. MnO2, NiO and CuO are taken as main ingredients, and ZnO, Nb2O5, Y2O3 and Nd2O3 are taken as secondary ingredients; in the main ingredients, content of MnO2 is 65.0-70.4mol%, content of NiO is 16.3-18.3mol%, and content of CuO is 13.3-16.7mol%; amount of added ZnO is 3.3-13.3mol% of the amount of the main ingredients, amount of added Y2O3 is 0.3-0.7mol% of the amount of the main ingredients, amount of added Nb2O5 is 0.3-3.3mol% of the amount of the main ingredients, and amount of added Nd2O3 is 0.3-1.7mol% of the amount of the main ingredients. The invention also discloses a preparation method of the thermal sensitive ceramic material with negative temperature coefficient. The thermal sensitive ceramic material with negative temperature coefficient has superior characteristics of low resistivity and high B value.

Description

technical field [0001] The invention relates to a thermally sensitive ceramic material with a negative temperature coefficient, in particular to a thermally sensitive ceramic material with a low resistivity and high B value and a negative temperature coefficient and a preparation method thereof. Background technique [0002] At present, negative temperature coefficient (NTC) thermistors are widely used in temperature detection, temperature control, inrush current suppression and other occasions. The higher the activation energy of the NTC semiconductor thermistor material, the greater the resistivity ρ, so the high material constant B value material corresponds to the high resistivity material. With the current existing technology and formula, low resistivity and high material constant B value NTC thermosensitive ceramic materials are difficult to develop and cannot meet the special occasions that require low resistance and high material constant B value at room temperature....

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/622
Inventor 卢振亚黄祖映陈志武
Owner SHANTOU XINCHENG ELECTRON TECH CO LTD
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