Sl. |
Materials |
Characteristics |
Applications |
|
|
|
|
1. |
Babbit
or White Metal alloys (tin base) |
Very
expensive |
Used
for general purpose resistant to corrosive effects of acids.
I.C. engine bearings. |
2. |
Lear-base
White Metal |
Low
cost, lower strength and susceptibility to corrosion, high
coefficient of friction |
General
machinery purpose. Used at moderately high temperatures. Lead
ranging from 0.981 MN/m�(0.22 kgf/mm�) at m/s |
3. |
Phosphor
Bronze |
Good
mechanical and antifriction properties. |
All
machines. The permissible load is 68.65 MN/m�(7.0 kgf/mm�).
Max rubbing speed 5m/s |
4. |
Gun
Metal |
Chill
casting gives a finer structure and is preferable to sand
casting |
Light
loads |
5. |
Aluminum
|
Good
corrosion fatigue resistance and thermal conductivity low
embeddability, high thermal expansion. |
Suitable
for heavy loads upto about 24 MN/m�(2.45 kgf/mm�) peak load
and 13.73 MN/m�(1.40 kgf/m) continuous load at moderate speeds
of 4 to 6 m/s |
6. |
Cadmium
base bearing metals |
Allow
much higher operating temperatures than are safe with babbit. |
Used
for severe service in internal combustion engines. |
Alloy
Form |
Metallographs
|
Comparable
SAE
Reference |
ABC
Reference |
Features
And Applications |
Cast
Babbitt |
|
SAE-14 |
AB-14 |
This
lead base babbitt is soft, excellent embeddability for
relative applications, minimum lubrication, good resistance,
low fatigue resistance and has been used for many years in
lower load application. |
|
SAE-15 |
AB-15 |
This
lead base babbitt has a good bearing performance, good embeddability
and has been used for many years in lower load application. |
|
SAE-12 |
AB-90 |
This
tin base babbit has good sliding properties, conformability
and high toughness, good embedability suitable for
high sliding velocities in the hydrodynamic range, mean load,
impact stress at low frequency insensitive to reversed bending
stress. |
Cast
Copper
Lead |
|
SAE-793 |
AB-8 |
Increased
hardness and wear resistance. Increasing the lead content improves
the tolerance of poor alignment and intermittent lubrication. |
|
SAE-792 |
AB-9 |
This
material is best suited for bushings and washers subjected
to high impact and vibratory loads. In most cases, it operates
best with hardened shaft. |
|
SAE-49 |
AB-21 |
High
fatigue strength, normally plated with an overlay when used
in bearing application and in this form may be operated with
hard or soft shafts, susceptible to corrosion by degraded
oil when not overlay plated. |
|
SAE-794 |
AB-23 |
High
fatigue strength and shock resistance, suitable for high speed
shafts, oscillating or rotating motion hard shaft desirable,
normally overlay plated when used in bearing application. |
Sintered
Copper
Lead |
|
SAE-792 |
AB-9 |
This
material is best suited for bushings and washers subjected
to high impact and vibratory loads. In most cases, it operates
best with a hardened shaft. |
|
SAE-49 |
AB-21 |
This
is a bearing material designed exclusively for high load.
The material is plated with a unique trimetal overlay and
nickel dam. |
|
SAE-794 |
AB-23 |
This
material is employed for bushings and thrust washers applications
subjected to intermediate impacts and vibratory loads. It
has certain degree of embeddability and it is suitable for
higher speed & load. |
Clad
Aluminium |
|
SAE-783 |
ABAL-20 |
This
aluminium clad has good fatigue resistance, good surface behavior,
excellent corrosion resistance, Intermediate to heavy load,
main, con.rod bearing, thrust washer and wrapped bushes for
hard and soft shafts. |
Cast
Aluminium
(Solid) |
|
SAE-770 |
ABAL-6 |
This
material having a high fatigue strength, good corrosion resistance
and conformability is used corrosion resistance and conformability
is used with hard shafts. |