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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
Q. Discuss the significance of viscosity in lubricating oil. How the viscosity is determined by Redwood viscometer? OR Wr
Advantages of cold working (i) No heat is needed. (ii) Better surface finish is get. (iii) Superior dimension control. (iv) Improved strength and hardness properti
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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
Give the properties and applications of Bakelite. This is most common type of phenol formaldehyde. This is hard, thermosetting, dark coloured material. Its major properties
Why protons doesn''t react which each other?
Explain the problems of flooding and channeling in packed tower
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