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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
Draw the B-H curve for a ferro-magnetic material and identify the retentivity and the coercive field on the curve. B-H curve for a ferromagnetic material is drawn a
What are the objectives of heat treatment of metals? Objectives of heat treatment- Cause relief of internal stresses developed while cold working, welding, casting, forgi
Diffusion: Molecular diffusion, often known as simply diffusion, is a net transport of molecules from a region of higher concentration to one of lower concentration by chance mole
Explain with suitable diagrams the atomic model of diffusion. Atomic Model of Diffusion Diffusion happens as a result of repeated jumps of atoms from their sites to other ne
What are the different characteristics that can affect the flow of bulk solids and how? The main characteristics which can affect flow of bulk solids are as below: > Moistu
A copper pipe carrying steam at 1 atm and 100 °C has internal and external radii of 20 and 25 mm, respectively, and thermal conductivity 350 W/m K. With the inside wall at 100 °C a
A) A horizontal tube having a 1.25 cm outside diameter is submerged in a water 1 atm and 100 oC. Determine the heat flux for the surface temperature of (a) 540 o C, (b) 650 o C,
how to perform a project on bechamp reduction?
The degree of freedom when ice water and water vapour coexist in equilibrium is zero
Mask Alignment and Exposure One of the most significant steps in the photolithography process is mask alignment. A mask or "photomask" is a square glass plate with a patterned
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