Physics For Civil Engineering: Unit IV: New Engineering Materials
High Alumina Ceramics
Characteristics, Applications, uses
High alumina ceramics contain 85% or more by weight of Al2O3. • Alumina is an aluminium oxide (Al2O3), which is th e oldest engineering ceramic. • Alumina is produced from bauxite (Al2O3 • 2H2O).
HIGH ALUMINA CERAMICS
High
alumina ceramics contain 85% or more by weight of Al2O3.
•
Alumina is an aluminium oxide (Al2O3), which is the
oldest engineering ceramic.
•
Alumina is produced from bauxite (Al2O3 · 2H2O).
Characteristics of alumina:
1.
Alumina have excellent hardness, wear resistance and chemical inertness
properties.
2. They are more stiffer than steels.tou
airt nl
3. They are more stronger er in
compression than many hardened tool steels.
4. They retain 50% of their room
temperature strength at elevated temperature (about 1093°C).
5. They possess very good environmental
resistance.
6.
These
are mechanically strong, dense materials, of refractories which are usually
porous.
7.
They
have ability to resist high temperature because they are poor thermal
conductors.
8. They possess low neutron absorption cross-section. This
property enables them to find application in nuclear equipment.
9.
Alumina is blended with other ceramics such as zirconia to improve its tensile
and toughness properties.
10.
They have high corrosion resistance.
11.
They have high dimensional stability.
Applications
& uses
(i) Alumina is used as a refractory material
for high temperature applications.
(ii)
Alumina makes an excellent high voltage insulator. Classical applications are
for insulators in spark plugs and in insulating substrates to support
integrated circuits.
(iii)
Alumina based Is have very high abrasion ceramic tools resistance, high
hardness and are chemically stable than high speed steels. So they are used in
cutting cast irons, and steels to obtain good surface finish.
(iv)
Because of its high hardness, it is is often used as an abrasive material in
grinding wheels.
(v) It is used for pump liners, pump
impellers, check valves and nozzles subjected to erosion. on ei
(vi) Some unique applications found in
medical use that include restoration of teeth, bone filter and orthopaedic ared
implants.
Physics For Civil Engineering: Unit IV: New Engineering Materials : Tag: : Characteristics, Applications, uses - High Alumina Ceramics
Physics For Civil Engineering: Unit IV: New Engineering Materials
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Physics for Civil Engineering
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