BEARING OR ANTIFRICTION ALLOYS

A bearing alloy or antifriction alloy commonly possesses good wearing quality, low co-efficient of friction, high thermal conductivity, good casting qualities, non-corrosive properties, ability to withstand high pressure and impact, low shrinkage after coating and less cost. Various Bearing Metals are:

1 Admiralty Gun Metal

The composition of admiralty gun metal generally contains

Cu = 88%

Sn = 10%

Pb = 2%

Properties

Admiralty gun metal is having tensile strength of the order of 270 MN/m2. It possesses elongation of about 20% and Brinell Hardness of 65 BHN.

Applications

Admiralty gun metal is generally utilized where lubrication is needed and oiling is difficult.

2 Lead Bronze

Lead bronze generally contains

Cu = 80%

Sn = 10%

Pb = 10%

Properties

Lead bronze possesses tensile strength of 230 MN/m2 , Brinell Hardness of 65 BHN and elongation of about 15%.

Applications

Lead bronze possesses has antifriction properties and hence is generally utilized where lubrication is doubtful.

3 Hard Bearing Bronze

Hard bearing bronze basically contains

Cu = 85%

Sn = 15%

Properties

Hard bearing bronze generally possesses tensile strength of 220 MN/m2, 100 BHN and percentage elongation of 2%.

Applications

Hard bearing bronze is commonly used for high compressive loads such as locomotive slide valves etc.

Reference Introduction to basic Manufacturing Processes and Workshop Technology by Rajender Singh.

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