Thermistor sintered body and method for manufacturing thermistor sintered body

Patent metadata

Field	Value
Publication number	US-12555707-B2
Application number	US-202118560607-A
Country	US
Kind code	B2
Filing date	Nov 11, 2021
Priority date	Nov 11, 2021
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

A thermistor sintered body has a thickness in a range of 1 μm to 100 μm and an area in a range of 1 mm 2 to 10 mm 2 , and is composed of a single body of a sintered body having a composition of NiMn 2 O 4 . This thermistor sintered body can be manufactured by a first step of dropping a raw material liquid RL onto a surface of a substrate rotatably supported, a second step of rotating the substrate with the dropped raw material liquid RL and spreading the raw material liquid RL, a third step of forming a sintered body having the composition of NiMn 2 O 4 on the surface of the substrate by heating and holding the raw material liquid RL and the substrate on which the raw material liquid RL has been placed, and a fourth step of separating the sintered body from the substrate.

First claim

The invention claimed is:

1 . A thermistor sintered body, wherein the thermistor sintered body has a thickness in a range of 1 μm to 100 μm and an area in a range of 1 mm 2 to 10 mm 2 , and the thermistor sintered body is composed of a single body of a sintered body having a composition of NiMn 2 O 4 , wherein in the thermistor sintered body, 40% to 80% of Mn in the NiMn 2 O 4 is substituted with Fe, and the thermistor sintered body has a relative density of 90% or more.

2 . The thermistor sintered body according to claim 1 , wherein:
the thickness is in a range of 10 μm to 50 μm; and the area is in a range of 2 mm 2 to 5 mm 2 .

3 . A manufacturing method of a thermistor sintered body according to claim 1 , the manufacturing method comprising:
a first step of dropping a raw material liquid onto a surface of a rotatably supported substrate; a second step of rotating the substrate with the dropped raw material liquid and spreading the raw material liquid; a third step of forming the sintered body having the composition of NiMn 2 O 4 on the surface of the substrate by heating and holding the raw material liquid and the substrate on which the raw material liquid has been placed; and a fourth step of separating the sintered body from the substrate.

4 . The manufacturing method of the thermistor sintered body according to claim 3 , wherein the third step is performed after repeating the first step and the second step a plurality of times.

5 . The manufacturing method of the thermistor sintered body according to claim 3 , wherein in the fourth step, the sintered body is separated from the substrate based on a difference in linear expansion coefficient between the sintered body and the substrate.

6 . The manufacturing method of the thermistor sintered body according to claim 3 , wherein in the fourth step, the sintered body is separated from the substrate by selectively dissolving the substrate.

7 . The manufacturing method of the thermistor sintered body according to claim 3 , wherein a thermistor joined body, in which the sintered body is formed on the surface of the substrate, is cut and divided in a grid pattern when viewed from above in order to generate a plurality of thermistor divided bodies; and
wherein the sintered body is separated from the substrate by selectively dissolving a boundary portion in each of the plurality of generated thermistor divided bodies, the boundary portion being located between the sintered body and the substrate.

8 . The manufacturing method of the thermistor sintered body according to claim 5 , wherein a trace of a material forming the substrate remains on a separation surface, which is a surface of the sintered body from which the substrate is separated.

9 . The manufacturing method of the thermistor sintered body according to claim 3 further comprising:
recovering the sintered body separated from the substrate by magnetic force.

10 . The thermistor sintered body according to claim 2 , wherein 20% to 90% of Mn in the NiMn 2 O 4 is substituted with Fe.

11 . A manufacturing method of a thermistor sintered body according to claim 2 , the manufacturing method comprising:
a first step of dropping a raw material liquid onto a surface of a rotatably supported substrate; a second step of rotating the substrate with the dropped raw material liquid and spreading the raw material liquid; a third step of forming the sintered body having the composition of NiMn 2 O 4 on the surface of the substrate by heating and holding the raw material liquid and the substrate on which the raw material liquid has been placed; and a fourth step of separating the sintered body from the substrate.

12 . The manufacturing method of the thermistor sintered body according to claim 4 , wherein in the fourth step, the sintered body is separated from the substrate based on a difference in linear expansion coefficient between the sintered body and the substrate.

13 . The manufacturing method of the thermistor sintered body according to claim 4 , wherein in the fourth step, the sintered body is separated from the substrate by selectively dissolving the substrate.

14 . The manufacturing method of the thermistor sintered body according to claim 4 ,
wherein a thermistor joined body, in which the sintered body is formed on the surface of the substrate, is cut and divided in a grid pattern when viewed from above in order to generate a plurality of thermistor divided bodies; and wherein the sintered body is separated from the substrate by selectively dissolving a boundary portion in each of the plurality of generated thermistor divided bodies, the boundary portion being located between the sintered body and the substrate.

15 . The manufacturing method of the thermistor sintered body according to claim 6 , wherein a trace of a material forming the substrate remains on a separation surface, which is a surface of the sintered body from which the substrate is separated.

16 . The manufacturing method of the thermistor sintered body according to claim 7 , wherein a trace of a material forming the substrate remains on a separation surface, which is a surface of the sintered body from which the substrate is separated.

17 . The manufacturing method of the thermistor sintered body according to claim 5 further comprising recovering the sintered body separated from the substrate by magnetic force.

18 . The manufacturing method of the thermistor sintered body according to claim 6 further comprising recovering the sintered body separated from the substrate by magnetic force.

Assignees

• Shibaura Electronics Co Ltd

Inventors

• Nakamura Kazumasa
• Nakayama Noriyuki
• Yanase Ikuo

Classifications

• H01C17/00

  Apparatus or processes specially adapted for manufacturing resistors (providing fillings for housings or enclosures H01C1/02; reducing insulation surrounding a resistor to powder H01C1/03; manufacture of thermally variable resistors H01C7/02, H01C7/04) · CPC title

• B28B1/20

  by centrifugal or rotational casting (slip-casting involving rotation of the mould B28B1/28; for molten material B28B1/54) · CPC title

• H01C7/043

  Oxides or oxidic compounds · CPC title

• H01C7/04

  having negative temperature coefficient · CPC title

• H01C17/065

  by thick film techniques, e.g. serigraphy · CPC title