The Property And Application of Bismuth Powder

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What property does bismuth Powder have?

Bismuth powder Metal bismuth is a metal with a silvery white (pink) to light yellow luster. It has poor thermal and electrical conductivity. Metal bismuth, a brittle metal with a light yellow to silvery white luster is easy to crush and has sand-like characteristics.Bismuth occurs in nature as oxide bismuth dioxide (Bi2O3) or sulfide-bismuthite. Bismuth Loess is created by the oxidation process of bismuthite, bismuth, and other bismuthcontaining sulfides. Because bismuth’s melting point is low, it can easily be reduced with charcoal.

Bismuth trioxide can be produced when bismuth powder, heated above melting point, emits a light-blue flame. Bismuth powder can also be mixed with sulfur or halogens when red hot. Bismuth powder does not dissolve in water, and it is also insoluble in nonoxidizing acids like hydrochloric. Even concentrated hydrochloric or sulfuric acid reacts only slightly upon heating. But it is soluble with aqua regia, and concentrated nitric acids.

What is the application of bismuth?

1. Metallurgical additives
A small amount bismuth can be added to steel to improve the performance. Bismuth can also be added to malleable casting iron to give it properties similar to stainless steel.

2. Bi-based low melting temperature fusible alloy
For cold stamping, thin metal plates are formed using an alloy of bismuth and tin. The alloy can be reused many times because the temperature is no lower than that of the steel mould.
Electric appliances, safety device, automatic device indicators, etc., are all made from a low melting point alloy composed of bismuth, aluminum, tin cadmium and indium.

3. Medical treatment
The astringent action of bismuth medicines is used for surgery to treat hemostasis and trauma.

4. Application of bismuth to flame retardants
Bi203, among flame retardant chemicals, has a greater effect than Sb203. It is also non-toxic and safe. The smoke that is produced during combustion can be extremely harmful and has no effect on the stability of flame retardant products.

5. Use of Bismuth in Chemical Industry
Bismuth Yellow pigment is made from a combination of bismuth vanadate (bismuth oxide) and bismuth mollybdate. Double crystal surface pigments can be used to substitute lead, cadmium or other pigments. It has excellent surface resistance against chemical corrosion. It also has strong adhesion, and a vibrant color. It is difficult to fade and fall off.

6. Electronic ceramics
Electronic ceramics with bismuth powder are used as a scintillation material in devices like nuclear radiation sensors, x ray level scanners.

7. Semiconductor
Air conditioners and refrigerators are assembled using high-purity powders of bismuth combined with tellurium and other elements such as selenium and antimony. Artificial bismuth can be used as a photoresistor in photovoltaics devices, and to increase the sensitivity of the visible spectrum.

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