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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 the objectives of heat treatment processes? The heat treatment is generally adopted for the following: (i) To refine grain structure (ii) For better machinabili
DISTILLATION
explaination of weak acid vs weak base titration
It is desired to generate an iron-carbon alloy that has a minimum hardness of 200 HB and a minimum ductility of 35%RA. Is such an alloy possible? If so, what will be its compositio
What is Metallization Metallization is the fabrication step in which proper interconnection of circuit elements is made. Aluminum is a popular metal used to be linked ICs, bo
Zeolites are used to adsorb a wide range of solutes from vapour and gas streams. What is it about their structure that makes them suitable for selective adsorption? What isotherm(s
Planar defects * Grain boundaries occur where the crystallographic direction of the lattice abruptly changes. This usually happens when two crystals start growing separately an
The various types of polarization processes are: a) Electronic polarization b) Ionic Polarization c) Orientation Polarization, and d) Space charge Polarization
Applications of Diffusion is of fundamental significance in many disciplines of mechanical, electronics, chemistry, and biology. Some example applications of diffusion: Sin
What are the objectives of annealing? Annealing , is a heat treatment where in a material is altered, causing alters in its properties like as strength and hardness. It is a p
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