Explores the Strength of Fused Silica Composites • QSI Quartz

According to a study conducted by Zhou et al. (2007) and featured on ScienceDirect, fused silica (fused silicon dioxide) is a silica glass known for its amorphous structure. Unlike regular glasses that contain various ingredients to lower the melting temperature, fused silica is pure, resulting in exceptionally high working and melting temperatures.

The study also delves into the properties of a fused silica-matrix composite with unidirectional carbon fibers and SiC particles as fillers. The inclusion of SiC particles decreases the flexural strength in the fiber direction but increases it in the transverse direction. This increase is attributed to the SiC particles making it harder for sliding to occur at the fiber-matrix interface.

On its own, fused silica exhibits a flexural strength of 54.8 MPa and a fracture toughness of 1 MPa·m1/2. However, when combined with carbon fibers, the flexural strength and fracture toughness are significantly enhanced in the longitudinal direction.

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