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%
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.
2 Lead Bronze
Lead bronze generally contains
Cu = 80%
Sn = 10%
Pb = 10%
Lead bronze possesses tensile strength of 230 MN/m2 , Brinell Hardness of 65 BHN and elongation of about 15%.
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%
Hard bearing bronze generally possesses tensile strength of 220 MN/m2, 100 BHN and percentage elongation of 2%.
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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