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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
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ACTIVITY 1 INVESTIGATION OF THE STORE Investigate the store of any one of the laboratories in your study centre and write a report in approximately 500 words. Procedure
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Positive and Negative Photo resist There are two types of photo resist: positive and negative. For positive resists, the resist is exposed with UV light where the underlying ma
What are the functions of oxide layer in high quality IC? Explain. Silicon has the unique ability to be oxidized into silica, which makes a chemically stable, protective and i
Introduction : You will recall previous study of this course about the various duties and activities of a lab staff that facilitate management of the laboratory in an efficient ma
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