Abstract
The method of atomic force microscopy explores a roughness of a surface of the silica glass cooled with different velocity from temperature 2300 °C. It is compared two modes of cooling of a glass rods with a diameter of 16mm: convective heat exchange with the surrounding air and quenching with dropping the sample into a vessel with water. The roughness of a surface of a silica glass in the second mode of cooling was essentially less that can promote magnification of its strength. The results of these studies may turn out to be promising in terms of increasing the strength and reliability of silica optical fibers used in laser surgery.
Highlights
The silica glass (SG) possesses high strength, which is estimated to be equal to 22-44GPa [1]
Experimental studies on ultra-thin fibers made of SG with a diameter of 120nm [2] showed strength close to the theoretical level (26GPa)
Strength of silica fibers with a diameter of 125mm is equal to 6GPa
Summary
The silica glass (SG) possesses high strength, which is estimated to be equal to 22-44GPa [1]. Experimental studies on ultra-thin fibers made of SG with a diameter of 120nm [2] showed strength close to the theoretical level (26GPa). This result, along with the small size of the tested fiber sample, can be due to its high cooling rate, which helps to reduce the surface roughness of the SG.
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