Ceramic material and resistive element

Patent metadata

Field	Value
Publication number	US-10134512-B2
Application number	US-201715823664-A
Country	US
Kind code	B2
Filing date	Nov 28, 2017
Priority date	Jun 4, 2015
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

A ceramic material has a composition represented by Ca x′ Na x Mn y′ M y O 12 , wherein M denotes at least one of Ni and Cu, and x′, x, y′, and y satisfy any of (a), (b), and (c) in which x′+x=X and y′+y=Y:

0.9
7.0

≦

X
Y

<

1.0
7.0

;

(
a
)

at a condition of

X
Y

=

1.0
7.0

,

0.03
8

≦

x

X
+
Y

<

0.30
8

⁢

⁢
and

⁢

⁢

0
≦

y

X
+
Y

≦

0.35
8

;
and

(
b
)

1.0
7.0

<

X
Y

≦

1.0
6.9

.

(
c
)

First claim

What is claimed is:

1. A ceramic material having a composition represented by Ca x′ Na x Mn y′ M y O 12 , wherein
M denotes at least one of Ni and Cu; and
x′, x, y′, and y satisfy any of the following formulae (a), (b), and (c) in which x′+x=X and y′+y=Y:

0.9
7.0

≦

X
Y

<

1.0
7.0

;

(
a
)

at a condition of

X
Y

=

1.0
7.0

,

0.03
8

≦

x

X
+
Y

<

0.30
8

⁢

⁢
and

⁢

⁢

0
≦

y

X
+
Y

≦

0.35
8

;
and

(
b
)

1.0
7.0

<

X
Y

≦

1.0
6.9

.

(
c
)

2. A resistive element comprising:
an element body; and
at least two electrodes provided with at least a portion of the element body interposed therebetween; wherein
the element body is composed of the ceramic material according to claim 1 .

3. The resistive element according to claim 2 , wherein the resistive element is a thermistor element that suppresses an inrush current.

4. The resistive element according to claim 2 , wherein
the element body has a plate shape; and
the two electrodes are provided on respective principal surfaces of the plate-shaped element body and opposed to each other.

5. The resistive element according to claim 4 , wherein the element body has a disc shape.

6. The resistive element according to claim 2 , wherein a lead wire is connected to each of the at least two electrodes via solder.

7. A ceramic material comprising:
a composite oxide of Ca, Na, Mn, and M, with M representing at least one of Ni and Cu; wherein
x′, x, y′, and y denote a Ca-containing molar portion, an Na-containing molar portion, an Mn-containing molar portion, and an M-containing molar portion, respectively, and x′+x=X and y′+y=Y, the ceramic material satisfies any of (a), (b), and (c):

0.9
7.0

≦

X
Y

<

1.0
7.0

;

(
a
)

at a condition of

X
Y

=

1.0
7.0

,

0.03
8

≦

x

X
+
Y

<

0.30
8

⁢

⁢
and

⁢

⁢

0
≦

y

X
+
Y

≦

0.35
8

Assignees

• Murata Manufacturing Co

Inventors

• Hirose Sakyo

Classifications

• H01C7/008

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

• H01C7/043 Primary

  Oxides or oxidic compounds · CPC title

• H01C7/023 Primary

  containing oxides or oxidic compounds, e.g. ferrites · CPC title

• C04B35/00

  Shaped ceramic products characterised by their composition {(porous ceramic products C04B38/00; ceramic articles characterised by particular shape, see the relevant classes, e.g. linings for casting ladles, tundishes, cups or the like B22D41/02; ceramic substrates for microelectronic semi-conductors H10W70/692)}; Ceramics compositions ({shaping of ceramics B28B;} containing free metal bonded to carbides, diamond, oxides, borides, nitrides, silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides or sulfides other than as macroscopic reinforcing agents C22C); Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products {(infiltration of sintered ceramic preforms with molten metal C04B41/51; chemical preparation of powders of inorganic compounds C01)} · CPC title

• C04B35/62645

  Thermal treatment of powders or mixtures thereof other than sintering · CPC title