Thermal shock testing of lapped optical glass

Yingrui Zhang; Yuansun Wu; Han Liu; John C. Lambropoulos

doi:10.1117/12.733854

14 September 2007 Thermal shock testing of lapped optical glass

Yingrui Zhang, Yuansun Wu, Han Liu, John C. Lambropoulos

Proceedings Volume 6671, Optical Manufacturing and Testing VII; 66710H (2007) https://doi.org/10.1117/12.733854
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

We have measured and modeled the thermal shock fracture of the commercially available BK-7 borosilicate crown optical glass as a function of surface finish prior to thermal shock testing. For surfaces lapped with alumina abrasives in the range 5 μm to 40 μm, the critical temperature drop for fracture in thin disk samples increases with diminishing abrasive size, and changes from 123.7±1.1 °C (for surfaces lapped with 40 μm abrasives) to 140.2±2.8 °C (for surfaces lapped with 5 μm abrasives.) We correlate the measured thermal shock (critical) temperature drop with the glass thermal and mechanical properties, including the fracture toughness, and the depth of surface cracks induced by the lapping process. We distinguish between "severe" and "mild" thermal shock conditions in terms of the applicable heat transfer coefficient and Biot number. We estimate that the depth of the strength controlling cracks on the edge of the disk samples was about 55-70 μm.

Citation Download Citation

Yingrui Zhang, Yuansun Wu, Han Liu, and John C. Lambropoulos "Thermal shock testing of lapped optical glass", Proc. SPIE 6671, Optical Manufacturing and Testing VII, 66710H (14 September 2007); https://doi.org/10.1117/12.733854

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