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In metallurgy, non-ferrous metals are metals or alloys that do not contain iron (allotropes of iron, ferrite, and so on) in appreciable amounts.. Generally more costly than ferrous metals, non-ferrous metals are used because of desirable properties such as low weight (e.g. aluminium), higher conductivity (e.g. copper), [1] non-magnetic properties or resistance to corrosion (e.g. zinc). [2]
Stellite alloys are a family of completely non-magnetic and corrosion-resistant cobalt alloys of various compositions that have been optimised for different uses. Stellite alloys are suited for cutting tools, an example is Stellite 100, because this alloy is quite hard, maintains a good cutting edge at high temperature, and resists hardening and annealing.
Jewellery chains are typically made from precious metals, mainly gold and silver. Platinum, palladium and steel may also be used. These metals are used because they are not very reactive, keep both their intricate shape and their strength, and require only minimal maintenance to keep their shine.
The chemical elements can be broadly divided into metals, metalloids, and nonmetals according to their shared physical and chemical properties.All elemental metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metallic elements; and have at least one basic oxide.
The Langevin theory is not the full picture for metals because there are also non-localized electrons. The theory that describes diamagnetism in a free electron gas is called Landau diamagnetism , named after Lev Landau , [ 19 ] and instead considers the weak counteracting field that forms when the electrons' trajectories are curved due to the ...
Nickel is a silvery-white metal with a slight golden tinge that takes a high polish. It is one of only four elements that are ferromagnetic at or near room temperature; the others are iron, cobalt and gadolinium. Its Curie temperature is 355 °C (671 °F), meaning that bulk nickel is non-magnetic above this temperature.
The anchors, escape wheels and other watch mechanisms were also made of non-magnetic metals or alloys. [citation needed] Another way of making a watch non-magnetic is to house the entire movement into a case made of a highly permeable (magnetically conductive) material. The movement is covered by an additional soft-iron clasp to prevent the ...
The basic design of cut steel jewellery is a thin metal baseplate onto which closely placed steel studs were riveted or scewed. [3] [4] The baseplate could be made from various metals such as brass, tin or silver alloys. [3] Early cut steel consisted of individual steel studs that had been polished and inserted into metal frames. [1]