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Semiconductor ceramic composition for NTC thermistors

A technology of ceramic composition and thermistor, which is applied in the manufacture of thermistors, resistors, resistors, etc., can solve the problems that the method of annealing cannot be used, improve the utilization rate of raw materials, realize manufacturing costs, and simplify process management Effect

Active Publication Date: 2013-09-11
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, for a composition system containing a large amount of Co, the resistance value does not substantially change even by annealing, so annealing cannot be used for resistance adjustment, and it is desired to develop a countermeasure for resistance adjustment

Method used

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  • Semiconductor ceramic composition for NTC thermistors
  • Semiconductor ceramic composition for NTC thermistors
  • Semiconductor ceramic composition for NTC thermistors

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0050] First, as a ceramic raw material, weigh Mn 3 o 4 、Co 3 o 4 , Fe 2 o 3 、Al 2 o 3 and TiO 2 each powder, so that it reaches the composition shown in Table 1. In Table 1, "Mn 3 o 4 ","Co 3 o 4 " and "Fe 2 o 3 "In each column, Mn as the main component is shown in the unit of "% by weight" 3 o 4 、Co 3 o 4 and Fe 2 o 3 The content ratio between, "Al 2 o 3 ” and “TiO 2 "In each column, "parts by weight" is used as a unit to show relative to Mn 3 o 4 、Co 3 o 4 and Fe 2 o 3 A total of 100 parts by weight of Al 2 o 3 and TiO 2 respective weight ratios.

[0051] Next, the above weighed object was put into a ball mill, fully wet pulverized together with a pulverizing medium made of zirconia, and then fired at a temperature of 900° C. for 2 hours to obtain a ceramic powder.

[0052] Next, a predetermined amount of an organic binder and water are added to the ceramic powder, mixed by a wet method to form a slurry, and then shaped by a doctor blade meth...

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Abstract

The invention relates to a Semiconductor ceramic composition for NTC thermistors containing at least manganese and cobalt which is easier to adjust the resistance of the composition by annealing . A semiconductor ceramic composition for use as a component of the body of NTC thermistors contains at least manganese and cobalt as main ingredients and both aluminum and titanium as additional ingredients for resistance adjustment by annealing. It becomes easier to adjust the resistance of the composition by annealing when the titanium content is equal to or lower than about 9.2 parts by weight on a TiO2 basis relative to 100 parts by weight of the main ingredients.

Description

technical field [0001] The present invention relates to a semiconductor ceramic composition for an NTC thermistor, in particular to a semiconductor ceramic composition for an NTC thermistor containing at least manganese (Mn) and cobalt (Co) as main components. Background technique [0002] NTC thermistors are known to be suitable for applications such as temperature detection. In recent years, NTC thermistors for temperature detection have been required to obtain higher temperature detection accuracy. Specifically, it is required to control the temperature-resistance value deviation within ±1%. [0003] On the other hand, NTC thermistors have a problem that variations in the resistance value of finished products are unavoidable due to factors such as conditional variations that are inevitably encountered in the manufacturing process. Therefore, for example, as described in paragraph [0011] of Japanese Patent Laid-Open No. 8-236308 (Patent Document 1) as prior art, heat trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/04
CPCH01C7/043H01C7/18H01C17/06533C04B35/01C04B35/265C04B2235/3217C04B2235/3232C04B2235/3263C04B2235/3272C04B2235/3277H01C7/008H01C7/041
Inventor 三浦忠将田代英辅
Owner MURATA MFG CO LTD
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