Effect of heat treatment on the microhardness of quartz glass of the Ku-1 brand

摘要

The paper presents the results of the experimental measurements of the microhardness of the quartz glass of the KU-1 brand annealed for 5 hours at three temperatures: 900, 1000, and 1100A degrees C. The dependences of the change in microhardness have been studied under different loads on the indenter. It is shown that the values of the microhardness on the indenter at a load of 100 g decreases with increasing temperature and are virtually unchanged at a load of 59 g within the confidence interval. A brittle fracture around indenter marks for the sample treated at 1100A degrees C occurs at higher loadings than for the original not heat-treated sample.