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Advantages:

Good Mechanical Properties

High Electrical and Thermal Conductivity

Very Resistant to Corrosion and Wear

Can be easily Formed and Machined

Can be easily Joined by soldering, brazing, Welding

Can be easily polished and plated

Pressing and Forging Temperatures are lower than Ferrous Metals.



Related Terms

BRONZE

A Copper-Tin alloy. Additions of up to 10% tin are soluble in copper and form soft ductile alloys which can be cold-worked. Further additions of tine result in the appearance of a hard constituent, such alloys being suitable for hot-working and for castings. The cold worked alloys are used mainly for coinage.

Admiralty Gunmetal (88: 10: 2, Cu: Sn: Zn)

Zinc is present as a deoxidizer and increases fluidity. This alloy is used mainly for castings requiring strength and corrosion resistance. An additional of 1% lead may be used to improve pressure tightness. The alloy may be used for bearings.

Cast 15% tin bronze is suitable for bearings.

Phosphorus increases strength and corrosion resistance.

Alloys containing up to 8% and 0.3% phosphorus can be cold worked and are used for instrument springs and steam turbine blades. Cast alloys contain up to 13 tin and up to 18% phosphorus are used mainly for bearings.

Alloys containing up to 9.4% aluminum are soft and ductile and are suitable for hot and cold working. Further additions result in the appearance of a hard constituent and are used for the hot worked condition and for castings. Aluminum bronzes have good mechanical properties, wear, fatigue and corrosion resistance. The 7% aluminum alloy often contains small additions of nickel, iron and manganese and is used for marine condenser tubes.

The 10% alloy with additions of nickel, iron and manganese is used for propellers.

MANGANESE BRONZE

Copper and zinc alloy with traces of aluminium and manganese.

GUNMETAL

Alloy of approximately 88% copper and tin.

SILICON BRONZE

Alloy of approximately 96% copper and 1.5% silicon.

MONEL METAL

Copper and nickel form solid solutions for all proportions. These alloys may be hot or cold worked and have excellent corrosion resistance.

(29.5 Ni:68.5 Fe:1 Mn:1) Monel Metal. This alloy combines good mechanical properties and high corrosion resistance.

BEARING METAL

Alloys used for bearings should have the following characteristics:

  • Have a low coefficient of friction
  • Be sufficiently hard to resist wear
  • Be tough to withstand shock loading
  • Have the strength to support the working load
  • Be sufficient plastic to allow self-alignment
  • Have a high thermal conductivity to dissipate heat when running.

The alloys employed usually consist of hard particles in a soft matrix. The hard particles provide the wear resistance while the matrix provides the mechanical properties.

Alloys used for bearing should have a low co-efficient of friction, be sufficiently hard to resist wear, tough to withstand shock loading, have strength to support the working load, be sufficiently plastic to allow self alignment and have high thermal conductivity to dissipate heat when running. The alloys employed usually consist of hard particles in a soft matrix. The hard particles provide the wear resistance while the matrix provides the mechanical properties.

Copper Base Bearing Alloys

Phosphor - bronzes containing 10-13% tin and 0.3 - 1% phosphorus and tin bronzes containing 10-15% tin are used for bearings where loading is heavy. Lead bronzes are useful in that they have a high resistance to wear and have good thermal conductivity enabling the bearings to remain cool. Sintered bearings are made by heating a compressed powder mixture of 90% copper and 10% tin with an addition of graphite. These bearings being semi-porous retain lubricant.

Yorcalbro - Copper - Zinc Alloy

22% zinc 2% aluminium 0.04% arsenic.

BABBITT

A soft, white, non-ferrous alloy bearing material composed principally of copper, antimony, tin and lead.

ALUMINIUM BRONZE

Alloy of approximately 90% copper and 10% aluminium.

ALLOY

A metal that is produced by mixing certain metals with a base metal for the purpose of achieving improved qualities over the base metal. An example is stainless steel, which has more chromium in it than carbon steel.

ALNICO

An alloy composed principally of aluminum, nickel, cobalt, and iron; used for permanent magnets

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