Abstract
AlN-W composite ceramics were prepared by spark plasma sintering using AlN powder and tungsten powder. Effect of size and content of tungsten particles on the densification, electrical and dielectric properties of AlN ceramic was studied. The result indicates that AlN ceramic with fine tungsten powder is easy to obtain higher densification. The dielectric constant and loss of the composites obviously increased with the increase of content and size of tungsten below the percolation threshold. When R c (the mean size of AlN powder) equals approximately R i (the mean size of tungsten powder), the composites obtain the highest percolation threshold (22vol. %), dielectric constant e r and tgδ are 110.90 and 0.02, respectively.
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