Introduction to Basic Manufacturing Processes and ... - always yours

Non-Ferrous Materials 85
springs, heavy duty electrical switches, cams and bushings. Having non-sparking characteristics,
it is used for making chisels and hammers using for such conditions where spark might cause
explosion. It has a film forming and a soft lubricating property, which makes it more suitable
as a bearing metal. Since the wear resistance of beryllium copper is five times that of
phosphorous bronze, therefore it is used as a bearing metal in place of phosphor bronze.
5.3.2.4 Manganese bronze
Manganese bronze is an alloy of copper, zinc and little percentage of manganese. The
usual composition of this bronze is
Copper = 60%
Zinc = 35%
Manganese = 5%
Manganese bronze is highly resistant to corrosion. It is stronger and harder than phosphor
bronze.
Applications
Manganese bronze is mainly used for bushes, plungers, feed pumps, rods etc. Worm
gears are frequently made from this bronze.
5.3.2.5 Aluminium Bronze
Aluminium bronze possesses
Cu = 85 to 88%
Al = 8 to 11%
Fe = 3%
Sn = 0.5%
Properties
The aluminium bronze with 8% aluminium possesses very good cold working properties.
When iron is added to this metal, its mechanical properties are greatly improved by refining
the grain size and improving the ductility. The maximum tensile strength of this alloy is 450
MPa with 11 % aluminium. This material possesses good resistance to corrosion and it is
somewhat difficult to cast due to oxidation problem.
Applications
Aluminium bronze is generally used for making fluid connection fittings, gears, propellers,
air pumps, bushings, tubes, slide and valves etc. Cams and rollers are commonly produced
using this alloy.
5.3.2.6 Bell Metal
Bell metal generally contains
Cu = 66.7%
Sn = 33.3%
Bell metal is very strong. It possesses resistance to corrosion water and atmosphere. It
is used to make bells.