Method for heat treating and sintering metal oxides with microwa

Details Method for heat treating and sintering metal oxides with microwa Method for heat treating and sintering metal oxides with microwa

1988-08-08

1989-11-14

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 25, C04B 3564

Patent

active

048805785

ABSTRACT:
A method for microwave sintering materials, primarily metal oxides, is described. Metal oxides do not normally absorb microwave radiation at temperatures ranging from about room temperature to several hundred degrees centrigrade are sintered with microwave radiation without the use of the heretofore required sintering aids. This sintering is achieved by enclosing a compact of the oxide material in a housing or capsule formed of a oxide which has microwave coupling properties at room temprature up to at least the microwave coupling temperature of the oxide material forming the compact. The heating of the housing effects the initial heating of the oxide material forming the compact by heat transference and then functions as a thermal insulator for the encased oxide material after the oxide material reaches a sufficient temperature to adequately absorb or couple with microwave radiation for heating thereof to sintering temperature.

REFERENCES:
patent: 3585258 (1971-06-01), Levinson
patent: 4219361 (1980-08-01), Sutton

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