fosforbronze

Fosforbronze, also known as phosphor bronze, is a copper alloy that contains tin and a small amount of phosphorus. Tin provides strength and wear resistance, while phosphorus acts as a deoxidizer and helps improve machinability and flow during forming. The alloy is typically produced with roughly 5 to 9 percent tin and up to about 0.4 percent phosphorus, with the balance copper; grades with different tin contents are available to suit various applications.

Properties of fosforbronze include high strength and hardness for a copper alloy, excellent wear and fatigue resistance, and a relatively low coefficient of friction. It is non-magnetic and offers good corrosion resistance, including in marine and mildly corrosive environments. The material remains ductile enough for forming and machining with conventional techniques, and many grades respond well to cold working to increase strength.

Processing and heat treatment vary by grade. Fosforbronze can be produced as castings or wrought products. Most phosphor bronzes are worked by cold forming to boost strength; some grades can be heat treated to further adjust properties. They are generally solderable and brazable, though high tin content may influence compatibility with some fluxes and processes.

Applications for fosforbronze are broad. It is widely used for springs, bearings, bushings, and valve seats due to its wear and fatigue resistance. Electrical components such as connectors and terminals employ phosphor bronze for its combination of conductivity and strength. The alloy is also used in musical instrument strings, notably for acoustic guitars and mandolins, where its tonal stability and durability are valued.

Overall, fosforbronze is chosen for combinations of strength, wear resistance, fatigue performance, and reliable machinability in demanding mechanical and electrical roles.