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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
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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PROCEDURE : Visit the preparation room of the lab (Physics/Chemistry/Zoology/I3otany), you studied in Exercise 1 and note its features. To make your study easy and to guide you, w
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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
Q. How can you measure the refractories and refractoriness under load of a refractory material?
PROCEDURE: Activity 1: Invitation of quotations. A format for inviting a quotation is given below. You are required to fill up the form for finding out the prices of the follo
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