Production of magnetic ferrite bodies

Claim 1

THE METHOD OF MAKING FERRITE BODIES HAVING A LARGE GRAIN BOUNDARY WHICH COMPRISES SINTERING TOGETHER FOR 10 TO 20 HOURS AT 800*C. TO 1000*C. MANGANESE CARBONATE AND ZINC OXIDE TO FORM A HOMOGENEOUS SOLID SOLUTION OF MANGANESE OXIDE AND ZINC OXIDE IN WHICH THE RATIO OF MANGANESE IONS TO ZINC IONS HAS A VALUE BETWEEN 1.0 AND 1.5, MIXING SAID SINTERED SOLID SOLUTION WITH ONLY FERRIC OXIDE SUFFICIENT TO GIVE BETWEEN 66 2/3 ATOM PERCENT AND 75 ATOM PERCENT OF IRON IN THE TOTAL ATOMS OF METALS PRESENT, SHAPING A BODY FROM THE RESULTANT MIXTURE, AND FIRING SAID SHAPED BODY IN AN ATMOSPHERE CONTAINING BETWEEN 0.5 PERCENT AND 2 PERCENT BY VOLUME OF OXYGEN AT A TEMPERATURE BETWEEN 1075*C. AND 1200*C. FOR BETWEEN 3 HOURS AND 48 HOURS SAID TEMPERATURES AND TIMES BEING SO CORRELATED AS TO GIVE LIMITED DIFFUSION OF SAID FERRIC OXIDE INTO SAID SINTERED SOLID SOLUTION TO FORM A PRODUCT CONSISTING ESSENTIALLY OF GRAINS OF MANGANESEZINC FERRITE DISPERSED IN A CONTINUOUS MATRIX OF FERRIC OXIDE.

Claim 2

THE METHOD OF MAKING FERRITE BODIES HAVING A LARGE GRAIN BOUNDARY WHICH COMPRISES SINTERING TOGETHER FOR 10 TO 20 HOURS AT 800*C. TO 1000*C. MANGANESE CARBONATE AND ZINC OXIDE TO FORM A HOMOGENEOUS SOLID SOLUTION OF MANGANESE OXIDE AND ZINC OXIDE IN WHICH THE RATIO OF MANGANESE IONS TO ZINC IONS HAS A VALUE BETWEEN 1.0 AND 1.5, MIXING SAID SINTERED SOLID SOLUTION WITH ONLY FERRIC OXIDE SUFFICIENT TO GIVE BETWEEN 66 2/3 ATOM PERCENT AND 75 ATOM PERCENT OF IRON IN THE TOTAL ATOMS OF METALS PRESENT, SHAPING A BODY FROM THE RESULTANT MIXTURE, AND FIRING SAID SHAPED BODY IN AN ATMOSPHERE CONTAINING BETWEEN 0.5 PERCENT AND 2 PERCENT BY VOLUME OF OXYGEN AT A TEMPERATURE BETWEEN 1075*C. AND 1200*C. FOR BETWEEN 3 HOURS AND 48 HOURS SAID TEMPERATURES AND TIMES BEING SO CORRELATED AS TO GIVE LIMITED DIFFUSION OF SAID FERRIC OXIDE INTO SAID SINTERED SOLID SOLUTION TO FORM A PRODUCT CONSISTING ESSENTIALLY OF GRAINS OF MANGANESEZINC FERRITE DISPERSED IN A CONTINUOUS MATRIX OF FERRIC OXIDE.