Abstract
Sizing removal of silica fibers was carried out by air heat-treatment, and the mechanical strength, surface condition, microstructures were studied by tensile breaking force measurement, X-ray photoelectron spectroscopy, field emission scanning electron microscope and high-resolution transmission electron microscope. Heat-treatment at 600°C in air was suitable for sizing removal of silica fibers, with the residual strength ratio of 26.6%. The effects of sizing removal by air heat-treatment on the silica fibers are: (a) the sizing acts as an protective layer for the silica fibers to cover the surface defects and decrease the sensitivity under external forces, and the tensile strength drops a lot after the sizing removal; (b) the decomposition and combustion of the epoxy sizing also lead to the embrittlement of the silica fibers.
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