Sapphire

no one interesting in sapphire?

How was it made?

Sapphire crystal is highly trusted material with its excellent chemical stability, mechanical property, and light transmission.

The hardest of the oxide crystals, sapphire retains its high strength at high temperatures, has good thermal properties and excellent transparency. Sapphire is anisotropic hexagonal crystal. Its properties depend on crystallographic direction

Were your samples made by melting the alumina,? If so, what furnace and fuel were used?

I have seen pictures of a hammer after it was used to hit a sapphire. The hammer was badly damaged, the sapphire wasn't.

The increase in strength with temp is interesting. Do you know at what temp it starts to decrease again?

apparently, the conductivity of sapphire is high compared to most ceramics, making it less prone to thermal shock.

Perhaps it is a good candidate for gas turbine blades?

A very interesting material.