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Phosphorous Bronzes containing 10-13% Tin and 0.3-1% Phosphorous and Tim Bronzes containing 10-15% Tin are used for bearings where the 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.

Sluntered 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.



Related Terms

BABBITT

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

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.

BABBITT BEARING

A bearing metal of non-ferrous material, containing several tin-based alloys, mainly copper, antimony, tin and lead.

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.

COMPASS BEARING

Bearing relative to compass north.

GLAZING

  1. Cutting and fitting panes of glass into frames. 2. Smoothing the lead of a wiped pipe joint by passing a hot iron over it.

BATTERY

An electrochemical device that stores electric current, often specialised as a cranking battery (for starting the engine) and house battery (for powering lighting and utilities), the latter often being the deep cycle type (capable of repeated full discharge and recharge with minimal degradation). The traditional wet cell lead acid battery (with dilute sulphuric acid as the electrolyte) is being increasing replaced by the newer maintenance free gel cell batteries. Technological advances from lead acid batteries include alkaline (ni-cad) and lithium electrolyte based batteries.

FLOAT CHAMBER

A sealed, hollow part attached to the compass card of a magnetic compass as part of the compass card assembly, to provide buoyancy to reduce the friction on the pivot bearing

PRELUBRICATED BEARING

A shielded, sealed, or open bearing originally lubricated by the manufacturer.

ASSEMBLED BEARING RUNOUT

A displacement of surface of bearing relative to fixed point when one raceway is rotated with respect to other raceway.

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