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Class Exercise

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Class Exercise
Class discussions
Covalent Ionic
• Name two ionic crystals.
• Name two engineering materials that are
joined by covalent bonding.
• Name a few industrial items made from
carbon-graphite.
• Compare the weight of a 1cm3 of carbongraphite to the same shape made from
steel.
2 indicate whether statement is ture
or false
• Most monolithic technical ceramics are
processed in a similar manner to metals,
namely melting and casting.
3. Some of our modern kitchen cookware is made
of ceramic, metal and plastic materials.
– (a) list at least three important characteristics required
of a materials to be used for this application
– (b) make a comparison of three ceramic materials as
to their relative properties and ,in additional, to cost.
– (c) on the basis of this comparison, select the material
most suitable for the cookware.
• Cite the two desirable characteristics of glasses.
• (a) What is crystallization? (b) cite a property
that may be improved by crystallization.
• What is the distinction between glass transition
temperature and melting temperature?
• Some ceramic materials are fabricated by hot
isostatic pressing. Cite some of the limitations
and difficulties associated with this technique.
• Compare the temperatures at which sodalime,
borosilicate, 96% silica, and fused silica may be
annealed?
• Compare the softening points for 96% silica,
borosilicate and sodalime glasses.
Class Exercise
Compare following items for the metal
(alloy), plastic polymer (thermoplastics)
and ceramic materials
– Atomic bonding
– Crystalline structure
– Mechanical properties
– Work temperature (high or low)
– Give examples in their applications
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