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Critical negative temp. coefficient thermistor ceramic material and its synthetic method

A technology of negative temperature coefficient and thermistor, applied in the direction of resistors with negative temperature coefficient, etc., can solve the problem of low critical temperature, achieve the effect of improving low-temperature static resistivity, ensuring safety, and shortening the holding time

Active Publication Date: 2008-11-19
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the problem of low critical temperature existing in commonly used critical temperature thermosensitive ceramics, and provides a critical negative temperature thermistor ceramic material suitable for high temperature range (150-500°C) application and a preparation method thereof

Method used

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  • Critical negative temp. coefficient thermistor ceramic material and its synthetic method
  • Critical negative temp. coefficient thermistor ceramic material and its synthetic method
  • Critical negative temp. coefficient thermistor ceramic material and its synthetic method

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with specific examples.

[0023] A critical negative temperature thermistor ceramic material, by mass percentage, includes the following components: Ni 2 o 3 5-20%, Cr 2 o 3 5-40%, Fe 2 o 3 5~50%, In 2 o 3 5~15%, CuO 0~20%, Al 2 o 3 0-20%. Specific examples are listed in Table 1. After calcination and synthesis in the composition examples in Table 1, it is also possible to synthesize ceramic material as the mass base, and add Al with a mass percentage of 0 to 20%. 2 o 3 (Additional components column in Table 1).

[0024] The synthetic method of thermistor ceramic material of the present invention, according to figure 2 The process flow shown is carried out:

[0025] Step 1: Weigh the oxides directly according to the proportion of ingredients listed in Table 1, prepare 100 grams of each example, and mix uniformly in a mortar for 0.5 hours. Wherein in embodiment 6-1, except C...

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Abstract

A ceramic material used as thermo-sensitive resistor with critical negative temp coefficient and used in high temp is proportionally prepared from NiO3, Cr2O3, Fe2O3, In2O3, CuO, and Al2O3 through proportional mixing, wet ball grinding, drying, sieving, calcining at 900-1200 deg.C for 1-4 hr, dry ball grinding, and sieving.

Description

technical field [0001] The invention relates to a thermistor ceramic material and a synthesis method thereof, in particular to a critical negative temperature coefficient thermistor ceramic material and a synthesis method thereof. Background technique [0002] The ceramic temperature sensor is a device made of the phenomenon that the resistance of ceramic materials changes with temperature. Among them, those whose resistance increases with temperature increase are called positive temperature coefficient thermistors, and those whose resistance decreases with temperature increase are called negative temperature coefficient thermistors. A linear thermistor whose resistance changes linearly with temperature is called a linear thermistor, while a sharp change in resistance over a certain temperature range is called a critical temperature thermistor (CTR). [0003] The CTR ceramic material with a negative temperature coefficient is a heat-sensitive semiconductor ceramic with crit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/622H01C7/04
Inventor 高积强梁森杨建锋罗明杨武柯高潮
Owner XI AN JIAOTONG UNIV