Effect of additives on compressive strength and thermal conductivity of vermiculite-silica composites with layered structure

摘要

The effect of additives on compressive strength and thermal conductivity of vermiculite-SiO₂ composites with a layered structure was investigated. Anisotropy in both properties was observed because of the layered structure produced by cellulose fibers. Both compressive strengths (58–123 MPa) and thermal conductivities (1.29–1.34 W/m·K) in the direction perpendicular to the pressing direction (T) were higher than those (22–68 MPa and 0.45–1.13 W/m·K) in the direction parallel to the pressing direction (S) in all samples. The compressive strength and thermal conductivity of the vermiculite-SiO₂ composite containing no additives were 54 MPa and 1.13 W/m·K when measured parallel to the pressing direction, respectively. In contrast, those of the composite containing 5 mass % TiO₂ and 5 mass % SiC were 68 MPa and 0.45 W/m·K when measured parallel to the pressing direction, respectively.