What is bronze?
Bronze is a metal product of the alloy (combination) between certain percentages of copper, tin or other metals. The ratio between the two main components will determine the color, stiffness and wear of the resulting product.
The origin of bronze dates back to 1700 AD, a period of prehistory characterized by the use of this new material for the construction of weapons and utensils, which meant a great step in terms of technology and the end of the Stone Age.
The term bronze comes from Latin Brundisium, which was the name of an ancient Italian city that today is known as Brindisi, from where bronze was distributed to the entire Roman Empire.
Bronze has the following properties:
- Its boiling point is 2230 to 2420 ° C
- Its melting point is 830 to 1020 ° C
- The density of bronze is 8.90 g / cm3.
- The hardness of bronze, according to the Binell scale, ranges from 70 to 200 HB (the maximum measurement of this scale of hardness is 600 HB).
- Properties of metals
Bronze is a metallic alloy characterized by:
- It is an excellent conductor of electricity.
- It accumulates less heat than other metals, for this reason it is used in the manufacture of industrial elements, since its use is safe.
- It is less rigid than other metals, making it an easy material to handle.
- Bronze is resistant to corrosion and this extends the useful life of products made from this alloy.
- It does not generate sparks when it hits a rigid surface, this makes bronze a safe material to use in the presence of flammable gases or explosive elements.
Composition of bronze
Bronze has a basic composition of copper and tin, with copper being the base metal.
However, the composition of bronze can vary according to its type and include other metals, generating various types of alloys. The most common compositions and proportions are:
- Basic bronze: 89% copper and 11% tin.
- Sol bronze: has a variable proportion of cobra and up to 60% cobalt.
- Cuproaluminium: it is a mixture of copper and up to 11% aluminum.
- Bell metal or bell bronze: 78% copper and 22% tin.
- Kane-kane: It is a very popular alloy in Japan that has 60% copper, 24% tin, 9% zinc and minor proportions of iron, lead, antimony or arsenic.
See also Copper.
Uses of bronze
Due to its versatility, bronze is an alloy widely used in different areas, such as:
Industrial tools or parts
Bronze is used as the main input for industrial use for the manufacture of hammers, springs, turbines, etc.
Bronze is a resistant material but at the same time more malleable than other metals, which is why it is used to mint coins in different countries.
Jewelery and costume jewelery
Depending on the proportion of its components, bronze can be used in the manufacture of high-end jewelery, as well as serial jewelery pieces.
Bronze is used to make bells, chimes, cymbals, and gongs.