High thermal conductivity AIN-SiC composite artificial dielectric material

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Dense composites of dielectric material having high thermal conductivity and adjustable dielectric properties. The dense composites are composed of homogeneous mixtures of AlN and SiC with at least one member selected from the group consisting of Y2O3, La2O3, rare earth oxides, CaO and Li2O. These composites are ideally shaped into usable products such as traveling wave tubes and electronic accelerators for use in microwave environments.