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| From: Mr2John |
28/06/2000
1:18:00
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| Subject: Ceramic |
post id:
91136
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Is ceramic any material that can
be engineered to any specification or must it fall in a category of
containing a certain material or something like that?
-
John
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| From: DV
(Avatar) |
28/06/2000
1:44:00
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| Subject: re: Ceramic |
post id:
91141
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Ceramic means made of clay and
hardened by heat.
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| From: NickM |
28/06/2000
7:11:00
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| Subject: re: Ceramic |
post id:
91162
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A definition of a ceramic tool i
have is
"Ceramic Tools. Cutting tools made from fused, sintered, or
cemented metallic oxides."
"Cermet. A body consisting of ceramic
particles bonded with metal."
An introduction to Physical
Metallurgy
Avner; Sidney H
McGraw-Hill 1974
ISBN
0-07-Y85018-6
I thought a ceramic was any metallic salt or some
such. Isn't Aluminium oxide a ceramic? I can't remember the exact
definition we were given in "materials science" at uni. Can any chemists
help?
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| From: bob s |
28/06/2000
10:09:00
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| Subject: re: Ceramic |
post id:
91183
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ceramic is a metal oxide or a
mixture of metal oxides.examples of Useful ceramics of single oxides are
of Aluminium, Magnesium Chromium, barium, strontium, calcium, titanium ,
beryllium, thorium ,uranium, rare earth metals, plutonium. yttrium.
Zirconium and hafnium oxides are not useful as single oxides but need to
be alloyed with small amounts of other oxides. Other single metal oxides
are of zinc ,gallium, tin , manganese ,iron ,cobalt and nickel. Silicon
oxide (silica) is an important oxide.
The various clays are various
mixtures of silica with aluminium, magnesium, sodium or potassium and
others.
Some oxides have high melting points and are useful as
refractories
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| From: David Brennan |
28/06/2000
13:51:00
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| Subject: re: Ceramic |
post id:
91252
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bob got it. Ceramics are ionic
and covalently bonded materials, generally oxides of metals. They fall
into two basic categories, crystalline ceramics and glasses (amorphous or
semi-crystalline ceramics). Most engineering ceramics are hard, strong,
with very high melting points, low thermal and electrical conductivities
and relative low ductility (which is their major failing). They tend to
have low impact strength, high elastic modulii, and be comparitively
difficult to form.
David
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| From: DV
(Avatar) |
28/06/2000
17:45:00
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| Subject: re: Ceramic |
post id:
91354
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(Ahem)
ceramic
adj. & n.
-adj. 1 made of (esp.) clay and permanently
hardened by heat
2 of or relating to ceramics
-n.
1 a ceramic article or product
2 a substance, esp. clay,
used to make ceramic articles.
[Gk keramikos f keramos
pottery]
ceramics n. pl. 1 ceramic
products collectively
2 (usu. treated as sing.) the art
of making ceramic articles.
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