FORMATION OF QUARTZ GLASS SURFACE DEFECTS UNDER THERMAL TREATMENT CONDITIONS

摘要

The paper presents the results of an electron microscopic study of the surface of resonators made of quartz glass with high and low internal stress levels.In the presence of such stresses,thermal treatment induces two parallel processes,namely,the relaxation of stresses and growth of surface cracks of depth up to approx 0.5 mm.The growth of surface defects worsens the optical,mechanical,and acoustic quartz glass characteristics.