Thermistor sintered body and temperature sensor element

Patent metadata

Field	Value
Publication number	US-11313735-B2
Application number	US-201916764749-A
Country	US
Kind code	B2
Filing date	Oct 17, 2019
Priority date	Oct 31, 2018
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

A thermistor sintered body and a temperature sensor element that can adjust a resistance value in a wider range while suppressing an influence on a B constant. A thermistor sintered body of the present invention includes: a Y 2 O 3 phase as a main phase; and a Y(Cr/Mn)O 3 phase as a subphase, wherein a chemical composition of Cr, Mn, Ca, Pr and Y excluding oxygen includes one or two of Cr: 20 mol % or less and Mn: 20 mol % or less, Ca: 1 to 15 mol %, and Pr: 0.5 to 30 mol %, with the balance being unavoidable impurities and Y. In the present invention, preferably, the subphase is a Y(Cr,Mn)O 3 phase or a YCrO 3 phase, and Pr is dissolved in the Y(Cr,Mn)O 3 phase or the YCrO 3 phase.

First claim

What is claimed is:

1. A thermistor sintered body comprising:
Y 2 O 3 phase as a main phase;
a Y(Cr/Mn)O 3 phase as a subphase; and
a chemical composition of Cr, Mn, Ca, Pr and Y, excluding oxygen, comprising:

one or two both of Cr: 3 to 20 mol % and Mn: 0 to 20 mol %, Ca: 1 to 15 mol %, and Pr: 0.5 to 30 mol %, with the balance being unavoidable impurities and Y,
wherein the subphase is a Y(Cr,Mn)O 3 phase or a YCrO 3 phase, and Pr is dissolved in the Y(Cr,Mn)O 3 phase or the YCrO 3 phase.

2. A temperature sensor element comprising:
a heat sensitive body;
a pair of lead wires configured to be electrically connected to the heat sensitive body; and
a protective layer configured to cover the heat sensitive body, wherein the heat sensitive body comprises the thermistor sintered body according to claim 1 .

3. A thermistor sintered body comprising:
Y 2 O 3 phase as a main phase;
a Y(Cr,Mn)O 3 phase as a subphase; wherein Pr is dissolved in the Y(Cr,Mn)O 3 subphase; and
a chemical composition of Cr, Mn, Ca, Pr and Y, excluding oxygen,. comprising Cr:
3 to 15 mol %, Mn: 7 to 12 mol %, Ca: 2 to 7 mol %, and Pr: 0.5 to 15 mol %, with the balance being unavoidable impurities and Y.

4. The thermistor sintered body according to claim 3 , wherein
a standard deviation of a B constant is 5 [k] or less, and a standard deviation of a specific resistance is 100 [kΩ·mm] or more.

5. A temperature sensor element comprising:
a heat sensitive body;
a pair of lead wires configured to be electrically connected to the heat sensitive body; and
a protective layer configured to cover the heat sensitive body, wherein the heat sensitive body comprises the thermistor sintered body according to claim 4 .

6. A temperature sensor element comprising:
a heat sensitive body;
a pair of lead wires configured to be electrically connected to the heat sensitive body; and
a protective layer configured to cover the heat sensitive body, wherein the heat sensitive body comprises the thermistor sintered body according to claim 3 .

7. A thermistor sintered body comprising:
Y 2 O 3 phase as a main phase;
a YCrO 3 phase as a subphase, wherein Pr is dissolved in the YCrO 3 phase; and
a chemical composition of Cr, Ca, Pr and Y, excluding oxygen, comprising Cr: 10 to 20 mol %, Ca: 2 to 8 mol %, and Pr: 0.5 to 30 mol %, with the balance being unavoidable impurities and Y.

8. The thermistor sintered body according to claim 7 , wherein a standard deviation of a B constant is 5 [k] or less, and a standard deviation of a specific resistance is 100 [kΩ·mm] or more.

9. A temperature sensor element comprising:
a heat sensitive body;
a pair of lead wires configured to be electrically connected to the heat sensitive body; and
a protective layer configured to cover the heat sensitive body, wherein the heat sensitive body comprises the thermistor sintered body according to claim 7 .

Assignees

• Shibaura Electronics Co Ltd

Inventors

• Takeuchi Akitaka
• Niizeki Naohiro

Classifications

• H01C7/008 Primary

  Thermistors (H01C7/02 - H01C7/06 take precedence) · CPC title

• C04B35/505

  based on yttrium oxide · CPC title

• H01C7/06

  including means to minimise changes in resistance with changes in temperature · CPC title

• H01C7/045

  Perovskites, e.g. titanates · CPC title

• H01C17/06533

  composed of oxides · CPC title