公开(公告)号：US3597271A

公开(公告)日：1971-08-03

申请号：US3597271D

申请日：1969-07-09

Applicant: WESTINGHOUSE ELECTRIC CORP

Inventor： CAWLEY JOHN M ,  YOUNG ROBERT G ,  WAINIO ALBERT W

IPC: C04B2/02 ,  H01J9/04 ,  H01J9/12 ,  B44D1/02 ,  C23C ,  C23D

CPC classification number: H01J9/125 ,  H01J9/042 ,  H01J2201/32

Abstract: THE METHOD OF PRODUCING AIR STABILIZED-EARTH METAL OXIDE EMISSION MATERIAL BY MEANS OF A TWO-STEP HEATING PROCESS OF MIXED ALKALINE-EARTH METAL CARBONATE, BY WHICH THE EUTECTIC MELTING STAGE OF THE CARBONATE-OXIDE MIXTURE IS AVOIDED. ALKALINE-EARTH METAL CARBONATE IS HEATED TO A TEMPERATURE WHICH IS BELOW THE EUTECTIC MELTING TEMPERATURE FOR ALKALINE-EARTH CARBONATE-OXIDE MIXTURES. THE HEATING IS CONTINUED UNTIL ALL OF THE ALKALINEEARTH METAL CARBONATE IS CONVERTED TO ALKALINE EARTH METAL OXIDE. THE ALKALINE-EARTH METAL OXIDE IS THEN HEATED FROM ABOUT 1300*C. TO ABOUT 1750*C. FOR A PREDETERMINED TIME TO RENDER THE OXIDE AIR STABLE.