Refractory Technology
silicon carbide refractories have very low

None of these
Resistance to thermal shock
Thermal conductivity
Refractoriness (< 1700°C)

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Refractory Technology
What is Thoria?

Which is expensive & radioactive, is used in crucibles for melting high purity metals
Thoria Has high resistance to basic slags
All of these
Thoria Has high fusion temperature (> 3000°C) but poor resistance to thermal shock

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