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Bearing Materials Application.

 
  Bearing Materials Characteristic.  


 

 

 

 

 

 

Bearing Materials Application.

 

 

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.