Integrally sintered ceramic complex and method of manufacturing the same
AssigneeSony Corporation
InventorTomosaburo Kitamura
Life of this patent
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Abstract
An integrally sintered ceramic complex which is suitable for use as a substrate of a surface acoustic wave device and can effectively reduce unnecessary ultrasonic waves. The method of manufacturing the integrally sintered ceramic complex is also disclosed. The disclosed ceramic complex comprises a first ceramic portion made of densely sintered piezoelectric ceramic material and a second ceramic portion made of porously sintered ceramic material. Both the ceramic portions are sintered integrally, and the second portion surrounds the first portion. The operating area of the surface acoustic wave device is formed on the surface of the first ceramic portion.
Claims9
An integrally sintered ceramic complex, comprising:
- a first piezeoelectric ceramic portion;
- and a second ceramic portion;
- said first and second portions having a common external surface, said first and second ceramic portions being sintered integrally so that a boundary layer is formed between said first and second portions, the ratio of the theoretical density to the sintered density of said first ceramic portion being selected smaller than the same ratio of said second ceramic portion, and the ratio of the theoretical density to the sintered density in the boundary layer gradually increased from the ratio of said first portion to the ratio of said second portion so that ultrasonic waves propagating in said first piezeoelectric portion are effectively reduced in the boundary layer and said second portion.
Dependencies are inferred from the claim text.