Quartz mechanical properties - quartz sight glass

Quartz mechanical properties - quartz sight glass
The mechanical properties of quartz sight glass are better than those of hard sight glass and ceramics, but the brittleness is poor. The theoretical calculation of quartz sight glass is very high, about 24 x 103MPa, but the actual measured strength is a few times lower than that. The main factors influencing the strength of the first is the surface of the sight glass defects, especially the size and depth of micro crack in the surface is obvious, fine grinding of quartz sight glass specimen than coarse grinding, the flexural strength is about 0.6 times; followed by the internal defects, such as bubbles, impurities, uneven melting and residual stress etc. the strength of the quartz sight glass, as the temperature rises, reached close to the annealing temperature.
The shear modulus, Young's modulus, damping, Poisson's ratio and modulus of quartz sight glass are generally increased with the increase of temperature, and the hardness increases with the temperature.

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