A process for making improved microwave susceptor comprising a dielectric silicate foam substrate coated with a microwave active coating

摘要

The present invention provides a process for making an improved thermally insulated microwave silicate foam susceptor. The process for making the improved microwave susceptor comprises the following steps: a) preparing pourable aqueous alkali metal dielectric sodium silicate slurry, b) pouring said slurry into a smooth surface substrate mold, c) heating said poured slurry at an effective elevated temperature to foam the slurry in said mold; d) drying said foam at an effective elevated temperature to provide said dry silicate foam substrate having a substantially smooth surface; e) coating at least a portion of said substantially smooth surface with an effective amount of a flowable microwave active material coating (MAC) and drying said flowable coating at an effective temperature to form a dry layer of said MAC.