Effect of Temperature on The Fracture of Sapphire
- Details
- Category: Molybdenum & Sapphire Growth Furnace News
- Published on 12 December 2013
- Written by Cloudy
- Hits: 281
At low temperatures, metastable crack growth dictates the environment free strength of sapphire. Plastic 
deformation by dislocation motion or twin formation and growth plays no role in the fracture process at temperatures below 400° C. These conclusions are supported both by crack growth studies and critical stress intensity factor measurements on sapphire crystals, and by transmission electron microscopy studies of arrested cracks in sapphire and alumina.
The temperature field and heat flow about the solidification interface of web crystals was modified by use of shaped radiation sinks. As a result, web was grown as wide as 3 cm and flat to less than 2.5 µm in 100 µm thick sheet. A qualitative extension of thermal models in dendrite growth applied to web morphology satisfactorily explains the experimentally observed results.
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