Reply To: turn heat into electricity

[KeithPickering]

Just to follow up, here’s a comparison of various grades of Technox vs. various grades of alumina

	Material:                          Technox 2000   Technox 3000      96% AlO3    99.5% AlO3

	Flexural strength (Kpsi)                   145            203           50         55   

	Compressive strength (Kpsi)                290            290          305        377

	Modulus of elasticity (Mpsi)                30             30         43.5       54.4

	Poisson ratio:                             .30            .30          .21        .22

	Fracture toughness (KIC)                    10             10          3.5          4

	

Dynex doesn’t give dielectric constants in its materials sheet, but http://iopscience.iop.org/0508-3443/18/6/305 indicates that zirconia has a dielectric constant of 22, while that of alumina is about 4.