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Thermal spelling: The breaking or cracking or peeling off the refractory is known as spelling. A good refractory must show a good resistance to thermal spelling. Thermal spelling can be decreased by minimizing the development of internal stress by:
(1) Using refractory with high porosity, good thermal conductivity and low coefficient of expansion.
(2) Avoiding sudden temperature changes.
(3) Proper furnace design
Salient properties of common semiconducting materials. The salient properties of semi-conducting materials are: These are the materials whose valence electrons are bound
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Permeability: The rate of diffusion of molten solid liquid and gases through refractories is called permeability. Low permeability is usually more important than low porosity from
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In what important respect does the conductivity of a conductor differ from that of an intrinsic Semiconductor. It is well known that the conductivity of a conductor i
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