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Wave-transparent ceramic composites with excellent comprehensive performances are of particular significance for the development of space vehicles. In this study, Si 3 N 4w  was prepared by the gel-casting process and then combined with chemical vapor infiltration (CVI)-obtained Si 3 N 4  to yield Si 3 N 4w /Si 3 N 4  composites with five Si 3 N 4w  volume fractions. The influence of the Si 3 N 4w  volume fraction on the microstructures, mechanical properties, and dielectric characteristics of the Si 3 N 4w /Si 3 N 4  composites were all studied. The results showed that Si 3 N 4w /Si 3 N 4  composites possess A sandwich structures. Higher Si 3 N 4w  volume fractions led to less incorporated amounts of the Si 3 N 4  matrix at the same depth. The 25 vol% Si 3 N 4w /Si 3 N 4  composites integrated relatively higher Si 3 N 4w  volume fraction and load transfer ability of the matrix, leading to better flexural strengths reaching up to 41.37 MPa. The dielectric constants of the five prepared Si 3 N 4w /Si 3 N 4  composites ranged from 2.25 to 4.0. The dielectric losses were all lower than 0.005, demonstrating the good dielectric properties of the Si 3 N 4w /Si 3 N 4  composites.

The Influence of Si3N4w Volume Fraction on the Microstructure and Properties of Si3N4w/Si3N4 Composites via CVI Technique