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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
definition
numericals based on kohlrausch law
Soft-Baking Soft-baking is the step during which almost all of the solvents are separate from the photo resist coating. Soft-baking plays a very critical role in photo-imaging.
Requisites of refractory material or essential requirements of good refractory: a. It should be able to withstand high temperature. The appropriate refractory is chose
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Wet air containing 4.0 mole% water vapor at 76°F and 14.8 psia is passed through a column of calcium chloride pellets. The pellets absorb 97% of the water and none of the other con
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given the displacement vectors A(3^i-4^j+4^k)m and B(2^i+3^j-7k)m,find the magnitudes of the vectors (a)C=A+B and (b)D=2A-B,also expressing each in terms of its rectangular compone
What are the chief characteristics of ferro-electric materials Ferroelectric materials have following characteristics: a) They have a huge dielectric constant which is non-
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