Lectures 1-2 Flashcards
Ceramics are
non-metallic, inorganic materials
Most ceramics are composed of
Si, C, or metal elements combined with O, C or N.
Crystalline ceramics have a —– arrangement of atoms
regular
Amorphous ceramics have an —– arrangement of atoms
irregular
Bonded ceramics are … . Includes examples of …. .
a combination of crystalline and amorphous structures, clay materials
Ceramics usually have a —- Young’s Modulus.
high
Ceramics are better in —– rather than in —–.
compression, tension
Ceramics have —– melting points
high
Ceramics, due to their melting points, are useful in what type of application
high temp applications
Ceramics do not have —— bonds, so are useful as —-
metallic, insulators
Ceramics often have —– —— conductivity
poor thermal
Ceramics are often environmentally —–, meaning they do not —— or ——-
stable, corrode, degrade
Crystalline ceramics with an edge dislocation. Why are they difficult to dislocate?
Due to the extra bonds with the ions that are between the larger atoms, unlike a simple crystalline metal.
Glass is used when talking about
a non-crystalline (amorphous) solid
Metals can form amorphous structures if they are….
cooled extremely rapidly, or processed carefully
Crystalline sillica forms a —— shaped structure
tetrahedral
Crystalline silica can form three structures;
quartz, crystabolite, and tridymite
Amorphous forms of silica are called
silica glasses
Pure forms of amorphous silica are…. (two)
fused silica or vitreous silica
Viscosity is a measure of
the resistance of a fluid to flow
Viscosity can be defined as the ratio of the
applied shear stress to the shear strain rate.
Increasing temperatures in a material, the viscosity becomes —-
lower (more flowy)
On a Volume-temp graph for a crystalline material solidification, the upper gradient represents …..
a low viscosity fluid aka liquid
On a Volume-temp graph for a crystalline material solidification, the middle vertical line represents …..
the material solidifying and gaining a regular structure
