Method of preparing thermal insulation for high temperature micr

Details Method of preparing thermal insulation for high temperature micr Method of preparing thermal insulation for high temperature micr

1995-08-22

1996-07-16

Czaja, Donald E.

Glass manufacturing

Processes

With destruction or delamination of transitory attached or...

65 324, 65 331, 65 334, 65 601, 65 603, 65 607, 65 606, 252 62, 501 96, 501 99, C03C 2300

Patent

active

055362923

ABSTRACT:
Superior microwave transparent thermal insulations for high temperature microwave sintering operations were prepared. One embodiment of the thermal insulation comprises granules of boron nitride coated with a very thin layer of glassy carbon made by preparing a glassy carbon precursor and blending it with boron nitride powder to form a mixture. The blended mixture is granulated to form a grit which is dried and heated to form the granules of boron nitride coated with a glassy carbon. Alternatively, grains of glassy carbon are coated with boron nitride by blending a mixture of a slurry comprising boron nitride, boric acid binder, and methyl alcohol with glassy carbon grains to form a blended mixture. The blended mixture is dried to form grains of glassy carbon coated with boron nitride. In addition, a physical mixture of boron nitride powder and glassy carbon grains has also been shown to be an excellent thermal insulation material for microwave processing and sintering.

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