Ceradyne manufactures a family of particulate composites called “lossy” ceramics,
whose purpose is to selectively absorb microwave energy of unwanted frequencies
enabling the tube to produce energy at the desired frequency. These composites have
tailored dielectric and loss properties to allow them to be matched to specific
microwave tube applications.
The Ceralloy® 6700 family of MgO-SiC compositions
are designed to absorb microwave energy in very specific frequency ranges.
The Ceralloy® 7700 family of Al2O3-SiC compositions,
Ceralloy® 13700 AlN-SiC compositions and the Ceralloy® 137
AlN based composites are broadband absorbers. The AlN composites have
high thermal conductivities designed to aid in heat dissipation within the microwave
The materials are used in various microwave tube applications including:
- Load Pellets