The Property And Application of Bismuth Powder

How do you define bismuth powder?

Bismuth powder At room temperature it does not react with water or oxygen. It is also stable in air and has poor electrical and thermal conductivity. It is an alloy with a metallic luster that ranges from silvery (pink to yellow) and which can be easily broken. Bismuth is composed of the oxide bismuth dioxide (Bi2S3), and sulfide-bismuthite. Because bismuth’s melting point is low, you can reduce it with charcoal.

If bismuth powder heated to above its melting point it will burn, emitting a blue flame that can generate bismuth triooxide. When bismuth is hot, it can be combined with sulfur and/or halogen. Bismuth is not soluble in water. It also does not dissolve in non-oxidizing acid (such as hydrochloric Acid). Although it reacts slightly to heating even concentrated sulfuric and concentrated hydrochloric, the powder is easily soluble in aqua regia or concentrated nitric acids.

How do you apply bismuth powder?

1. Additives for the Metalurgical Industry
A little bit of bismuth powder can enhance the steel’s processing capabilities. Also, small amounts of bismuth powder can be used to make cast iron with similar properties to stainless.

2. Bi-based fusible alloy with low melting points
For cold stamping and the forming of thin metal plates, this alloy from bismuth-tin is used. The alloy is able to be used many more times than it can form.
For making safety devices, electrical appliances and signaling systems, such as automatic device signals and safety equipment, there are a number of low melting alloys that include bismuth powder, aluminum, zinc, cadmium, tin and indium.

3. For medical treatment
Bismuth compounds can be used to treat gastrointestinal dyspepsia. They also have an antidiarrheal and astringent properties. The bismuth sodium subrubberate, and the bismuth carbonate are used to manufacture gastric medicine. Radiotherapy uses bismuth to shield patients from radiation.

4. Use of bismuth as a flame retardant
Bi203 outperforms Sb203 as a flame retardant, but it is also non-toxic and safe. Smoke from flame-retardant product combustion can be extremely dangerous and may cause death.

5. Bismuth is used in the chemical industry
Bismuth pigment yellow is made from bismuth vanadate mixed with bismuth molybdate. This is used in replacing lead, cadmium, and other pigments by double crystal yellow pigments. It is more resistant to chemical corrosion on the surface and it has brighter colors. It can be easily ruined or faded.

6. Electronic ceramics
The new generation of electronic ceramics that contain bismuth powder (such as bismuth crystals), are used to make devices such as piezoelectric lasers, nuclear radiation detectors, xray level scanners, electric optics and electro-optics.

7. Semiconductor
Use high-purity bismuth with selenium, tellurium, antimony and other elements to create crystal pulling semiconductor components. This is used for low temperature thermoelectric power generators, thermorefrigeration and thermocouples. It can also be used to build air conditioners. You can use artificial bismuth to create photoresistor in photovoltaic devices, and also increase your sensitivity in visible spectrum.

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