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Lettris
Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
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English dictionary
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definitions
white metal (n.)
1.an alloy (often of lead or tin base) used for bearings
synonyms
white metal (n.)
analogical dictionary
chemistry[Domaine]
Mixture[Domaine]
blend, mix, mixture[Hyper.]
alloy, debase - metal - made of metal, metal, metallic, of metal[Dérivé]
alloy, metal[Hyper.]
white metal (n.)
Wikipedia
White metal
This article is about metals. For the music genre, see Christian metal.
 |
This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (July 2009) |
The white metals are any of several light-colored alloys used as a base for plated silverware, ornaments or novelties, as well as any of several lead-based or tin-based alloys used for things like bearings, jewellery, miniature figures, fusible plugs, some medals and metal type.
Some of the metals that make up a white metal alloy are antimony, tin, lead, cadmium, bismuth, and zinc. Not all of these metals are found in all white metal alloys but are mixed to achieve a desired goal or need. As an example, a base metal for jewelry needs to be castable, polishable, have good flow characteristics, have the ability to cast fine detail without an excessive amount of porosity and cast at between 230 °C and 300 °C (450 °F and 575 °F).
In compliance with British law, the British fine art trade uses the term "white metal" in auction catalogues to describe foreign silver items which do not carry British Assay Office marks, but which are nonetheless understood to be silver and are priced accordingly.
Tin-lead and tin-copper alloys
Tin-lead & tin-copper alloys such as Babbitt metal have a low melting point that is ideal for use as solder, but these alloys also have ideal characteristics for plain bearings. Most importantly for bearings, the material should be hard and wear-resistant and have a low coefficient of friction. It must also be shock-resistant, tough and sufficiently ductile to allow for slight misalignment prior to running-in.
Pure metals are soft, tough and ductile with a high coefficient of friction. Intermetallic compounds are hard and wear-resistant but brittle. By themselves, these do not make ideal bearing materials.
Alloys consist of small particles of a hard compound embedded in the tough, ductile background of a solid solution. In service the latter can wear away slightly leaving the hard compound to carry the load. This wear also provides channels to allow in lubricant (oils). All bearing metals contain antimony (Sb) which forms hard cubic crystals.
| % Sn | % Sb | % Cu | % Pb | Applications |
|---|---|---|---|---|
| 93 | 3.5 | 3.5 | - | Light and medium IC engine big end bearings |
| 86 | 10.5 | 3.5 | - | Light and medium IC engine main bearings |
| 80 | 11 | 3.0 | 6 | General purpose heavy bearings (lead increases plasticity) |
| 60 | 10 | 28.5 | 1.5 | Heavy duty marine engine bearings, electrical machines |
| 40 | 10 | 1.5 | 48.5 | Low cost, general purpose, medium duty bearings |
