Tellurium Copper

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'''Tellurium Copper''' is an alloy of [[Copper]] and [[Tellurium]]. Tellurium improves [[machinability]] of Copper.

==Overview==
Tellurium is usually added to Copper to improve machinability ("free cutting"). [[ASTM]] specification B301 has 0.5% Tellurium; at concentrations of up to 0.75% machinability is improved whilst electrical conductivity and hot working behavior is maintained. Mechanical properties are similar to [[tough pitch copper]], whilst machinability is similar to [[Brass]] - the alloy's hardnesses are increased by precipitation of [[copper telluride]].<ref>Liquid error: wrong number of arguments (1 for 2)</ref>

Tellurium Copper is not suited to welding though can be welded with gas shielded arc welding or resistance welding; it can be readily [[soft solder]]ed, [[silver soldering|silver soldered]], or [[brazing|brazed]].<ref></ref>

Tellurium Copper can be used as the electrode in [[electrical discharge machining]] (EDM) - the alloy is used to replace Copper when [[grinding wheel]] loading occurs during fine finishing of the electrode - the alloy retains the properties of copper in the EDM process.<ref></ref>

==Phase diagram==
Copper forms [[telluride]]s (see also [[copper telluride]]); these include Cu₄Te, Cu₂Te (m.p. 1125C), and CuTe. A [[eutectic]] forms at 71% (mol) Te, (m.p. 340C). Between 4.3 to 30% (mol) Te there is stratification between Cu and Cu₂Te.<ref></ref>

==References==


===Further reading===
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==External links==

[[Category:Tellurium]]
[[Category:Copper alloys]]

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