# US 2014/0191837 A1 · Coil element and method for manufacturing the same

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- Number: US 2014/0191837 A1
- Document ID: US20140191837A1
- Status: Published application
- Kind: A1
- Application number: 14/146,464
- Filed: 2014-01-02
- Published: 2014-07-10
- Earliest claimed: 2013-01-04
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Byeong Cheol MOON; Soo Hwan SON; So Yeon SONG; Young IL LEE; Sung Eun KIM
- Web page: https://patentgrep.com/patent/US20140191837A1

## CPC

- H01F 41/041: {Printed circuit coils (apparatus or processes for manufacturing printed circuits in general H05K3/00)}
- H01F 17/0013: {with stacked layers}
- H01F 41/046: {structurally combined with ferromagnetic material}
- H01F 17/0033: {with the coil helically wound around a magnetic core}
- Y10T 29/4902: Electromagnet, transformer or inductor
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention relates to a coil element including a ceramic body and an internal electrode coil pattern formed on the ceramic body, wherein the ceramic body includes NiZnMn ferrite and the internal electrode coil pattern uses copper, and a method for manufacturing the same. The NiZnMn ferrite in accordance with the present invention can greatly increase a sintering process window and implement characteristics of a material through a single sintering process by suppressing conductivity due to generation of deposits inside the NiZn ferrite material in a thin oxygen atmosphere through addition of Mn to the conventional NiZn ferrite composition to increase a resistivity of the material.

## Claims

### Claim 1

A coil element comprising:
a ceramic body; and
an internal electrode coil pattern formed on the ceramic body, wherein the ceramic body comprises NiZnMn ferrite, and the internal electrode coil pattern uses copper.

### Claim 2 (depends on 1)

The coil element according to claim 1, wherein the NiZnMn ferrite comprises iron (Fe) ions at a ratio of 0.53 to 0.67 and manganese (Mn) ions at a ratio of 0.11 to 0.17 with respect to the total sum of Ni, Zn, Mn, and Fe ions.

### Claim 3 (depends on 2)

The coil element according to claim 2, wherein the NiZnMn ferrite comprises the nickel (Ni) ions at a ratio of 0.01 to 0.154 with respect to the total sum of the Ni, Zn, Mn, and Fe ions.

### Claim 4 (depends on 2)

The coil element according to claim 2, wherein a specific surface area of the NiZnMn ferrite in a powder state is 5 to 12 m2/g.

### Claim 5 (depends on 1)

The coil element according to claim 1, wherein the ceramic body further comprises a sintering additive.

### Claim 6 (depends on 5)

The coil element according to claim 5, wherein the sintering additive is selected from glass and a metal oxide.

### Claim 7 (depends on 1)

The coil element according to claim 1, wherein the coil element is selected from multilayer type and winding type.

### Claim 8 (depends on 2)

The coil element according to claim 2, wherein a resistivity of the coil element is greater than 1000 Ωcm.

### Claim 9

A NiZnMn ferrite comprising Fe ions at a ratio of 0.53 to 0.67 and Mn ions at a ratio of 0.11 to 0.17 with respect to the total sum of Ni, Zn, Mn, and Fe ions.

### Claim 10 (depends on 9)

The NiZnMn ferrite according to claim 9, wherein a ratio of the Ni ions is 0.01 to 0.154 with respect to the total sum of the Ni, Zn, Mn, and Fe ions.

### Claim 11 (depends on 9)

The NiZnMn ferrite according to claim 9, wherein the NiZnMn ferrite is used as a ceramic body of a coil element.

### Claim 12

A method for manufacturing a coil element, comprising:
manufacturing a ceramic green sheet;
forming an internal electrode coil pattern on the ceramic green sheet;
laminating the ceramic green sheets on which the coil pattern is formed;
de-binding the laminated laminate by separating the laminated laminate into chips; and
sintering the chip.

### Claim 13 (depends on 12)

The method for manufacturing a coil element according to claim 12, wherein the ceramic green sheet uses NiZnMn ferrite.

### Claim 14 (depends on 13)

The method for manufacturing a coil element according to claim 13, wherein the NiZnMn ferrite comprises Fe ions at a ratio of 0.53 to 0.67 and Mn ions at a ratio of 0.11 to 0.17 with respect to the total sum of Ni, Zn, Mn, and Fe ions.

### Claim 15 (depends on 13)

The method for manufacturing a coil element according to claim 13, wherein the NiZnMn ferrite comprises the Ni ions at a ratio of 0.01 to 0.154 with respect to the total sum of the Ni, Zn, Mn, and Fe ions.

### Claim 16 (depends on 12)

The method for manufacturing a coil element according to claim 12, wherein the internal electrode coil pattern uses copper.

### Claim 17 (depends on 12)

The method for manufacturing a coil element according to claim 12, wherein the sintering is performed in an oxygen atmosphere in which oxygen partial pressure is 1 to 100 ppm.

### Claim 18 (depends on 12)

The method for manufacturing a coil element according to claim 12, wherein the sintering is performed at a temperature of 850 to 1050° C.