Semiconductor ceramic composition and PTC thermistor

A ceramic composition and semiconductor technology, applied in thermistors, resistors, resistor parts, etc., can solve the problem of high manufacturing costs

Inactive Publication Date: 2017-02-22
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since it cannot be semiconducted when sintered in the air, there is a problem that the manufacturing cost becomes higher compared with the case of sintering in the air.

Method used

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  • Semiconductor ceramic composition and PTC thermistor
  • Semiconductor ceramic composition and PTC thermistor
  • Semiconductor ceramic composition and PTC thermistor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～73、 comparative example 1～27

[0077] Preparation of BaCO as starting material 3 、TiO 2 、 Bi 2 o 3 、Na 2 CO 3 、K 2 CO 3 , CaCO 3 , SiO 2 , MnCO 3 , oxides of RE (such as Y 2 o 3 ) and TM oxides (such as Nb 2 o 5 ), each raw material was weighed in such a manner that the composition after sintering was Table 1-9, and then wet-mixed in ethanol using a ball mill, then dried, and calcined at 800° C. for 2 hours.

[0078] The above calcined body was wet pulverized in pure water using a ball mill, and then dehydrated and dried. This is granulated using a binder such as PVA to obtain a granulated powder. This was molded into a cylindrical shape (diameter 17 mm×thickness 1.0 mm) by a single-screw extruder, and sintered at 1200° C. for 2 hours in an air atmosphere to obtain a sintered body.

[0079] Ag-Zn paste was applied to both sides of the sintered body by screen printing, and after sintering in the air at 500-800°C to form electrodes, the temperature characteristics of resistivity were measured a...

Embodiment 74

[0082] A semiconductor ceramic composition was prepared in the same manner as in Example 1 except that the atmosphere during sintering was set to a nitrogen atmosphere and further heat-treated in an atmosphere of 800° C., and the same evaluations as in Examples 1 to 73 were performed. The results are shown in Table 9.

[0083] According to Table 1, it can be seen that the composition range x of the Bi element is related to the Curie point. According to Examples 1-5, if the composition range of Bi element is 0.01≤x≤0.15, the Curie point is higher than that of BaTiO 3 The Curie point, that is, the high temperature side of 120°C moves, and the resistivity at room temperature is below 500Ωcm, the withstand voltage is above 400V / mm, and the resistance change rate △ρ / ρ 0 Keep it under 20%. In addition, it can be seen that the higher the content of x, the more the Curie point shifts to the high temperature side, and the room temperature resistivity tends to slightly increase. In C...

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Abstract

The present invention provides a semiconductor ceramic composition comprising a compound represented by the following general formula (1) as a main component. (Ba<v>Bi<x>A<y>RE<w>)<m>(TiTM<z>)O<3> (wherein, A represents both elements of Na and K; RE is at least one element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Gd, Dy and Er; and TM is at least one element selected from the group consisting of V, Nb and Ta.) 0.1=<x=<0.15 x=<y=<0.3 0=<w + z=<0.01 v + x + y + w = 1 u + z = 1 0.950=<m=<1.050 further, 0.001mol to 0.055mol of Ca is comprised and the ratio of Na / (Na+K) is 0.1 or more and less than 1.

Description

technical field [0001] The present invention relates to a semiconductive ceramic composition and a PTC thermistor used in heater elements or overheat detection elements and the like. Background technique [0002] As one of thermistors, a PTC (Positive Temperature Coefficient) thermistor having a positive temperature coefficient of resistance is known. This PTC thermistor can be used as a self-control heater element, an overcurrent protection element, an overheat detection element, etc., because the resistance increases with respect to temperature rise. For a long time, the PTC thermistor is based on the main component of barium titanate (BaTiO 3 ) is made by adding a trace amount of rare earth elements and making it semiconducting. It has low resistance when it is lower than the Curie point, but it becomes high resistance rapidly by several orders of magnitude when it is higher than the Curie point. [0003] BaTiO 3 The Curie point of silicon is usually about 120°C. By su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468H01C7/02
CPCC04B35/468C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/3239C04B2235/3251H01C7/025H01C7/026C04B35/4682C04B35/6261C04B35/62625C04B35/6263C04B35/62645C04B35/64C04B2235/3201C04B2235/3208C04B2235/3234C04B2235/3253C04B2235/3255C04B2235/3262C04B2235/3298C04B2235/3418C04B2235/602C04B2235/606C04B2235/6562C04B2235/6565C04B2235/658C04B2235/79C04B2235/9607H01C7/02H01C7/008H01C1/1406H01C7/027
Inventor 藤田一孝伊藤和彦志村寿一
Owner TDK CORPARATION
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