alloys, white metal



alloys, white metal defined in 1909 year

alloys, white metal - Alloys, White Metal;
alloys, white metal - (a) Tin, 82; lead, 18; antimony, 5; zinc, 1; and copper, 4 parts.

(b) Hard. Sheet brass, 32 oz.; lead, 2 oz.; tin, 2 oz.; zinc, 1 oz.

White Alloy. - This compound can be turned, filed, and bored; does not adhere to the mould, and will retain its polish a long time after exposure to the air. Contains 10 cast-iron, 10 copper, 80 zinc.

Birmingham Platinum. - This is a white alloy for buttons, and consists of copper, 43 per cent.; zinc, 57. Other alloys for white buttons are: (1) Yellow brass, 32 parts; zinc, 3; tin, 1. (2) Yellow brass, 32 parts; zinc, 4; tin, 2.

Chinese White Copper. - Copper, 40.4; nickel, 31.6; zinc, 25.4; and iron, 2.6 parts.

Alloy Resembling Silver. - Copper, 75 parts; nickel, 16; zinc, 2¼; tin, 2¾; cobalt, 2; iron, 1½; aluminium, ½. Fahlun or Tin Brilliants. - An alloy of especially fine lustre which is used for stage jewellery consists of tin, 3 parts, and lead, 2, or of tin, 3 parts, and lead, 1. For the production of brilliants melt small portions of the alloy in an iron crucible. By dipping into the fluid mass, previously freed from every particle of oxide, pieces of glass or brass, ground like brilliants and highly polished, a thin layer of metal adheres to them which, after cooling, can be readily detached. The separate pieces may be connected by soldering. Sometimes the alloy is poured into moulds faceted in the same manner as diamonds.

Victor Metal. - A white metal has been on the market for some time under this name. It is used for sand-casting, and is excellent for marine work, as it withstands the action of sea-water as well as any of the zinc alloys. It has a whiter colour than German silver. The following analysis was made of a sand-casting of this metal: Copper 49.94 per cent., zinc 34.27 per cent., nickel 15.40 per cent., aluminium 0.11 per cent., iron 0.28 per cent.

The iron is present as an impurity. It will be seen that the alloy contains a large amount of zinc. This renders the mixture cheap. As so much zinc is present, the alloy is hard, although quite strong. Great care must be used in making the mixture not to exceed the percentage of alumininum which is given, or brittleness will result. Two ounces of aluminium to 100 lb. of metal are all that are necessary. If one desires to duplicate the mixture, the following may be taken: Copper 50 lb., zinc 35 lb., nickel 15 lb., aluminium 2 oz.

The nickel and copper are melted together under borax, and then the aluminium added. The zinc is next added. The metal is poured into ingots, and gives better results after having been melted once. This mixture is too hard for rolling into sheet. ('The Brass World.')

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