Patent Number: 6,254,991

Title: Prepared ceramic powder

Abstract: The process for preparing ceramic powder having a core-shell structure by dissolving a crystalline ceramic powder In water so as to leave a core portion of the ceramic powder while heating; depositing a component of the ceramic powder dissolved in the water on and around surfaces of the core portion thereof as a deposited material from the water by gradually cooling the ceramic powder and the water obtained in the step of dissolving; and firing a mixture of the ceramic powder obtained in the step of depositing with an additive at a high temperature to subject the deposited material and the additive to solid phase reaction to form a shell portion on and around the core portion of the ceramic powder. The process can produce the ceramic powder having a core-shell structure from a crystalline ceramic powder, thereby achieving high electrical and mechanical features when formed into ceramic electronic parts. On the other hand, conventional ceramic electronic parts produced from highly crystalline ceramic powder raise the manufacturing cost because such ceramic powder is low in reactivity so that it requires high firing temperature. Ceramic powder in a core-shell structure produced from low-crystalline ceramic powder results to conventional ceramic electronic parts which are poor in electrical and mechanical characteristics.

Inventors: Kono; Yasuhisa (Tokyo, JP), Saito; Kenji (Tokyo, JP), Mizuno; Yoichi (Tokyo, JP), Chazono; Hirokazu (Tokyo, JP)

Assignee: Taiyo Yuden Co., Ltd.

International Classification: C04B 35/626 (20060101); C04B 35/49 (20060101); C04B 35/472 (20060101); C04B 35/462 (20060101); C04B 35/628 (20060101); C04B 35/468 (20060101); C04B 35/491 (20060101); H01G 4/12 (20060101); B32B 015/02 ()

Expiration Date: 07/03/2018