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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
What are its applications? (i) Direct extrusion: The billet is placed in a container and forced by the die through a piston. (ii) Indirect extrusion: The extruded part
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define emf and its application
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