CERAMIC SHEET AND PRODUCING METHOD THEREOF

• US 20090117328A1
• Filed: 11/06/2008
• Published: 05/07/2009
• Est. Priority Date: 11/07/2007
• Status: Abandoned Application

• Current Assignee: Kitagawa Industries Company Limited
• Original Assignee: Kitagawa Industries Company Limited
• Inventors: Matsuzaki, Toru, Kawai, Hideharu
• Application Number:
  US12/266,166
• Publication Number:
  US 20090117328A1
• Time in Patent Office: Days
• US Class Current: 428/141
• CPC Class Codes: B32B 18/00 Layered products essentially comprising ceramics, e.g. refractory products
• CPC Class Codes: C04B 2237/30 Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
• CPC Class Codes: C04B 2237/34 Oxidic
• CPC Class Codes: C04B 2237/343 Alumina or aluminates
• CPC Class Codes: C04B 2237/346 Titania or titanates
• CPC Class Codes: C04B 2237/361 Boron nitride
• CPC Class Codes: C04B 2237/363 Carbon
• CPC Class Codes: C04B 2237/365 Silicon carbide
• CPC Class Codes: C04B 2237/366 Aluminium nitride
• CPC Class Codes: C04B 2237/368 Silicon nitride
• CPC Class Codes: C04B 2237/70 Forming laminates or joined articles comprising layers of a specific, unusual thickness
• CPC Class Codes: C04B 2237/704 of one or more of the ceramic layers or articles
• CPC Class Codes: H05K 1/0233 Filters, inductors or a magnetic substance
• CPC Class Codes: H05K 1/0393 Flexible materials H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups
• CPC Class Codes: H05K 2201/086 for inductive purposes, e.g. printed inductor with ferrite core
• CPC Class Codes: H05K 2201/2009 Reinforced areas, e.g. for a specific part of a flexible printed circuit
• CPC Class Codes: H05K 3/0058 Laminating printed circuit boards onto other substrates, e.g. metallic substrates H05K1/0281 takes precedence
• CPC Class Codes: H05K 3/0067 onto an inorganic, non-metallic substrate
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]

Abstract

A ceramic sheet has at least one ceramic layer. The at least one ceramic layer includes a plurality of ceramic pieces, at least a part of the plurality of ceramic pieces is formed by cracking a sintered ceramic plate, which at least partially has a flat part, at the flat part of the sintered ceramic plate.

Claims

1. A ceramic sheet having at least one ceramic layer,

the at least one ceramic layer including a plurality of ceramic pieces,

at least a part of the plurality of ceramic pieces being formed by cracking a sintered ceramic plate, which at least partially has a flat part, at the flat part of the sintered ceramic plate.

2. The ceramic sheet according to claim 1, wherein the flat part is a part having a constant thickness in the sintered ceramic plate.

3. The ceramic sheet according to claim 1, wherein

the flat part is a part having no incision formed in the sintered ceramic plate.

4. The ceramic sheet according to claim 1, wherein

the plurality of ceramic pieces are formed by sandwiching the sintered ceramic plate between at least two another layers and cracking the sintered ceramic plate by applying external force to the sintered ceramic plate.

5. The ceramic sheet according to claim 1, wherein

the plurality of ceramic pieces are formed by adhering the sintered ceramic plate to at least another layer and cracking the sintered ceramic plate by applying external force to the sintered ceramic plate.

6. The ceramic sheet according to claim 1, wherein

the plurality of ceramic pieces are formed by cracking the sintered ceramic plate by causing the sintered ceramic plate to pass at least one roller such that external force is applied to at least one side of the sintered ceramic plate from the at least one roller.

7. The ceramic sheet according to claim 6, wherein

the sintered ceramic plate is caused to pass the at least one roller more than once and each time in different directions.

8. The ceramic sheet according to claim 1, wherein

the sintered ceramic plate includes as material at least one of Ni—

Zn ferrite, Mn—

Zn ferrite, Mg—

Zn ferrite, Ba ferrite, ferroxplana ferrite, Cu—

Zn ferrite, alumina, silicon carbide, barium titanate, aluminum nitride, boron nitride, silicon nitride, magnesia and graphite.

9. The ceramic sheet according to claim 1 having at least one another layer stacked on the at least one ceramic layer.

10. The ceramic sheet according to claim 9, wherein

the at least one another layer includes an adhesive layer made of adhesive material.

11. The ceramic sheet according to claim 9, wherein

the at least one another layer includes a conductive layer made of conductive material.

12. The ceramic sheet according to claim 9, wherein

the at least one another layer includes a heat-conductive layer made of heat-conductive material.

13. The ceramic sheet according to claim 9, wherein

the at least one another layer includes a damping layer made of damping material.

14. The ceramic sheet according to claim 9, wherein

the at least one another layer includes an impact-resistant layer made of impact-resistant material.

15. The ceramic sheet according to claim 1 having a band form, wherein

the at least one ceramic layer is attached to the band form.

16. The ceramic sheet according to claim 15, wherein

the at least one ceramic layer is a plurality of ceramic layers, and

the plurality of ceramic layers are aligned on one surface of the band form.

17. A method of producing a ceramic sheet having at least one ceramic layer, the method comprising a step of

forming the at least one ceramic layer including a plurality of ceramic pieces by cracking a sintered ceramic plate, which at least partially has a flat part, at at least the flat part of the sintered ceramic plate.