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Leadless positive temperature coefficient resistance material of high use temperature and stability and method for making same

A positive temperature coefficient, resistance material technology, applied in the field of lead-free semiconductor materials, can solve the problems of vicious circle control failure, loss, and increased heating power

Active Publication Date: 2008-10-15
江苏先进无机材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, once the temperature rises slightly due to voltage fluctuations, the original temperature and current balance will be lost due to the increase in the heating power of the material, which will further increase the material temperature and current, and the vicious cycle will eventually lead to control failure.

Method used

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  • Leadless positive temperature coefficient resistance material of high use temperature and stability and method for making same
  • Leadless positive temperature coefficient resistance material of high use temperature and stability and method for making same
  • Leadless positive temperature coefficient resistance material of high use temperature and stability and method for making same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Get x=0.2, Ln is La, x2=0.05, M is Nb, y=0.05, z=0, then form molecular formula to be (Na 0.5 Bi 0.5 ) 0.2 (Ba 0.75 La 0.05 ) Ti 0.95 Nb 0.05 o 3 composition of ceramics. Using TiO with strictly controlled impurity lead content 2 、BaCO 3 、Na 2 CO 3 、Bi 2 o 3 , La 2 o 3 , Nb 2 o 5As a raw material, sintering at 1350°C / 2 hours in an air atmosphere, cold processing, ultrasonic cleaning, and upper ohmic contact electrodes are ready to be used as PTCR ceramic components. Its resistance temperature characteristics see figure 1 , and the specific properties are listed in Table 1.

Embodiment 2-16

[0024] Adjust the room temperature resistivity, Curie temperature, resistance jump ratio and the resistance change rate ρR in the temperature range of 50°C above the Curie temperature by changing different replacement components and additives max . TiO 2 , CaCO 3 , SrCO 3 、BaCO 3 、Na 2 CO 3 、 Bi 2 o 3 , Y 2 o 3 , La 2 o 3 , Nb 2 o 5 、 Ta 2 o 5 , Sb 2 o 5 , MnCO 3 、Al 2 o 3 , SiO 2 , etc. are raw materials, according to the chemical composition listed in Table 1, according to the chemical formula (Na 0.5 Bi 0.5 ) x1 (Ba 1-x1-x2 ln x2 ) Ti 1-y m y o 3 Stoichiometric weighing of +zmol%N. Other processing conditions are with embodiment 1, and its performance is listed in table 1.

[0025] Composition and performance table of table 1 embodiment 1-16

[0026]

[0027]

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Abstract

The invention relates to a resistor material which has high operating temperature, high stability, no lead and positive temperature coefficient, and belongs to the lead-free semiconductor material field. The material has the general formula as follows: (Na0.5Bi0.5)x1(Ba1-x1-x2Lnx2) Ti1-yMyO3+zmol%N, wherein, x1 is larger than 0 and smaller than 0.5, x2 is larger than 0 and smaller than 0.1, y is larger than 0 and smaller than 0.1, z is larger than or equal to 0 and smaller than or equal to 1; Ln is one or more of Sr, Ca, Y and La, M is one or more of Nb, Ta and Sb, and N is one or more of MnO2, Al2O3, SiO2 and TiO2. The high operating temperature and lead-free PTCR material has the advantages that the operating temperature is higher than 130 DEG C, the resistance kicking ratio of the maximum resistance to the minimum resistance is 100:100,000, the resistivity at the room temperature is smaller than 800 ohm.cm, the resistance change rate in the temperature zone ranging from the maximum resistance temperature to the temperature which is 50 DEG C higher than the maximum resistance temperature is smaller than 15 percent, and the total content of lead in ceramic bodies is smaller than 50 ppm. The resistor material can be used for manufacturing various temperature sensors, thermostatic heating elements, current limiters, time delayers, etc., and can be widely applied to the fields of electronic communication, aeronautics and astronautics, automobile industries, household appliances, etc.

Description

technical field [0001] The invention relates to a lead-free positive temperature coefficient resistance (PTCR) material with high stability and high use temperature and a preparation method thereof, belonging to the field of lead-free semiconductor materials. Background technique [0002] PTCR ceramics is a ceramic material with both semiconducting and ferroelectric properties, that is, the grains have semiconducting properties, the grain boundary region has a low potential barrier below the Curie temperature, and electrons can move freely, while at the Curie temperature (T c ) A potential barrier is formed when a phase transition occurs near , blocking the conduction of electrons, resulting in a drastic change in resistance. The temperature characteristics of PTCR ceramics make PTCR ceramics have unique resistance-temperature (ρ-T) characteristics, current-voltage (I-V) characteristics, and current-time (I-t) characteristics. [0003] The service temperature of PTCR cerami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462
Inventor 郑嘹赢李国荣李艳艳冷森林王天宝曾江涛殷庆瑞
Owner 江苏先进无机材料研究院
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