Transparent ultrafine grained ceramics

Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing

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423263, 423635, 423622, 264 65, 264 66, 264332, C01F 704

Patent

active

040297551

ABSTRACT:
A pressure sintering process for the fabrication of ultrafine grained cercs having improved strength and enhanced transparency comprising the cold compressing of a ceramic oxide powder having a cubic crystal structure, removing undesired gases, raising to a temperature at which full density of the compact can be obtained in isothermal increments of about 50.degree. under elevated pressures while maintaining the temperature at each incremental increase for a period of about 50-60 minutes, and recovering the product.

REFERENCES:
patent: 2474440 (1949-06-01), Smith et al.
patent: 3423188 (1969-01-01), Lutwitzi et al.
patent: 3766080 (1973-10-01), Swinehart et al.

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