Introduction to Bismuth
Bismuth is a silver-white metal known for its high electrical resistance, making it exhibit the highest Hall effect among metals. Chemically similar to arsenic and antimony, bismuth has the lowest thermal conductivity after mercury. It is utilized in the preparation of fusible alloys and to prevent tin pest when alloyed with tin.
Production and Specifications of Bismuth Powder
Bismuth powder appears dark gray, with a chemical formula of Bi and a molecular weight of 208.98. Production methods include ball milling and atomization. Bismuth powder is available in various purities such as 99.99% and 99.999%, with particle sizes ranging from 100 mesh to 500 mesh, or customized to spherical bismuth powder as per requirements.
Properties and Applications of Bismuth Powder
Bismuth powder exhibits a density of 9.8g/cm³, a melting point of 271.50°C (520.7°F, 544.7 K), a boiling point of 1,564°C (2,847°F; 1,873 K), a dissolution heat of 11.30 kJ/mol, and an expansion rate of 3.3%. Its applications include:
Metal Nanolubricant Additive: Adding 0.1-0.5% nano bismuth powder to lubricating grease forms a self-lubricating, self-repairing film during friction, significantly enhancing grease performance.
Metallurgical Additive: Nano bismuth powder improves the machinability of cast iron, steel, and aluminum alloys.
Magnetic Materials: Bismuth’s low thermal neutron absorption cross-section and high melting point make it suitable as a heat transfer medium in nuclear reactors.
Q&A About Bismuth Powder
- What are the primary properties of bismuth powder?
Bismuth powder has a high density, a relatively low melting point, and significant diamagnetic characteristics, contributing to its diverse applications.
- How is bismuth powder typically packaged and stored?
Bismuth powder is packaged in 1kg bottles/bags or 25kg drums, vacuum-sealed in plastic bags and packed in cardboard or metal drums. It should be stored sealed in a cool, dry place to prevent moisture and oxidation, with recommendations to use it promptly after opening.
- What transportation precautions should be taken for bismuth powder?
Bismuth powder can be transported as regular cargo since it is non-hazardous.