04/30/2018

Bismuth Metal

Bismuth metal is silver gray to light pink metal, which is in form of ingots, sheets, granules, ball, powder.  Bismuth ingots tend to break up.  It shows light blue fire and yellow or brown bismuth oxide turns out when heating at room temperature. The molten metal get larger bulk after condensation. Bismuth metal powder is soluble in hot sulfuric acid, nitric acid, aqua regia, slowly dissolve in hot hydrochloric acid, but not in water.

Bismuth Metal

It doesn’t react with oxygen and water and stable in air at room temperature.

CAS No.:7440-69-9 EINECS No.:231-177-4 Molecular Formula:Bi Molecular Weight:208.98
Melting Point:271.4℃ Boiling Point:1560℃ Density:9.8g/ml

Applications

Bismuth metal is mainly raw material for fusible alloy ( Wood’s metal). The melting point is 47~262℃. The most common are Bi-Pb, Bi-Sn, Bi-Sb, Bi-In, which are for fire protecting arrangement, automatic sprinkler, safety plug of boiler, fuse, soldering tin. Bismuth alloy would’t shrink when solidification, so it is in casting printing type and high precision cast.

Steel add with small amount of bismuth can improve its processability. Cu-Bi multicomponent alloys are substitute for the Pb-Cu alloy of water conduit. With close cost, but avoid Pb polluting water. CuSn3Zn8Bi2-7 is another example that Bi replace Pb, however get same composite material and meet same requirements of casting, processing.  Adding bismuth to aluminum, magnesium and bronze can improve their machining property and wear-resisting property too. SnZnInBi alloy is non-toxic and fit for circuit board welding in assembling crystal valve that tend to overheat damage.

Bi-Al ally can be as filler of curved thin-walled tube that could keep tube inside smooth and clean, further repeat uses.

Bi-Sn alloy can be for cold stamping die mould of metal thin sheet. Bi-Sn alloy is substitute of Pb shots.

Bi-Pb-Sn-Cd-In series low-melting alloy apply to electric appliance, safety device,  signal meter of automatic.

Bi compound with tellurium, selenium, antimony and then pull crystal that is semiconductor parts. It is for thermoelectric couple, low temperature thermoelectric power generation and thermoelectric refrigeration.

High pure bismuth is heating medium or coolant of nuclear industry, which prevent atomic fission.