PROCESS FOR TREATING ELECTROSTRICTIVE CERAMIC ELEMENTS

1,187,289. Making piezo-electric elements. GENERAL ELECTRIC CO. 10 Oct., 1967 [13 Oct., 1966], No. 46202/67. Headings H1E. [Also in Division C1] An electrostrictive ceramic is heated in a container under reduced pressure, oxygen is admitted to raise the pressure to atmospheric, the ceramic is held a...

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Bibliographische Detailangaben
1. Verfasser:	CARL T. DURHAM JR
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE BASIC ELECTRIC ELEMENTS CAPACITORS CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY LIME, MAGNESIA METALLURGY REFRACTORIES SEMICONDUCTOR DEVICES SLAG TREATMENT OF NATURAL STONE
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Zusammenfassung:	1,187,289. Making piezo-electric elements. GENERAL ELECTRIC CO. 10 Oct., 1967 [13 Oct., 1966], No. 46202/67. Headings H1E. [Also in Division C1] An electrostrictive ceramic is heated in a container under reduced pressure, oxygen is admitted to raise the pressure to atmospheric, the ceramic is held at the temperature for a shorter period than the initial heating, and then cooled. Preferred conditions are: temperature 150-200 C., initial 4-5 hours and final heat 15-20 minutes. Lead metaniobates and zirconotitanates are specified. The process increases the resistance and is applied before polarization.