Many ceramic materials do not absorb microwaves (2.45 GHz) well at room temperature [3]. Susceptors are useful for initial heating of these ceramics.Susceptors are made of a material that absorbs microwaves at room temperature and act as heating elements, which “boost” the temperature until the dielectric loss in the ceramic is high enough that the ceramic couples directly with the field.For example, using silicon carbide susceptors, zirconia will heat primarily by radiation from the SiC, until it reaches approximately 600°C, whereby the zirconia couples preferentially and heats volumetrically.