Phosphor bronze (phosphor bronze) (tin bronze) (tin phosphor bronze) is composed of bronze with a degassing agent, a phosphorus content of 0.03-0.35%, a tin content of 5-8% and other trace elements such as iron Fe, zinc Zn, etc. It has good ductility and fatigue resistance and can be used for electrical and mechanical materials. Its reliability is higher than that of general copper alloy products.
Phosphor bronze, an alloy of phosphorus and copper. It is used to reduce brass and bronze alloys instead of pure phosphorus and is used as a phosphorus addition in the manufacture of phosphor bronze. It is available in 5%, 10% and 15% grades and can be added directly to the molten metal. It acts as a strong reducing agent and phosphorus hardens bronze. Even small amounts of phosphorus added to copper or bronze can increase its fatigue strength. To make phosphor bronze, a lump of phosphorus is pressed into molten copper until the reaction stops. Phosphorus is soluble in copper up to 8.27% to form Cu3P, which melts at 707°C. Phosphor bronze with 10% phosphorus melts at 850°C and with 15% phosphorus at 1022°C. Above 15%, the alloy is unstable. Phosphor bronze is sold in notched sheets or granules. In Germany, phosphor zinc is used instead of phosphor bronze to save copper. Metaphos is the German name for phosphor zinc containing 20-30% phosphorus. Commercial copper reduced with phosphorus, which contains less than 0.50% phosphorus, is also called phosphor bronze. Although the conductivity is reduced by about 30%, the hardness and strength are increased. Phosphor tin is a master alloy of tin and phosphorus, used in molten bronze to make phosphor bronze. Phosphor tin usually contains more than 5% phosphorus, but no lead. It looks like antimony, with larger crystals that are shiny. It is sold in flakes. According to the US federal specification, it contains 3.5% phosphorus and impurities are less than 0.50%.
Tin-phosphor bronze has higher corrosion resistance and wear resistance, and does not produce sparks when impacted. It is used for medium-speed and heavy-load bearings, with a maximum operating temperature of 250°C. It has the characteristics of automatic self-alignment, insensitive to deflection, uniform bearing force and high bearing capacity, can bear radial loads at the same time, self-lubricating and maintenance-free. Tin-phosphor bronze is a copper alloy with good electrical conductivity, not easy to heat up, ensuring safety and strong fatigue resistance. The tin-phosphor bronze socket reed hard-wired electrical structure, no rivet connection or friction-free contact, can ensure good contact, good elasticity, and smooth plugging and unplugging. The alloy has excellent machining performance and chip-forming performance, which can quickly shorten the processing time of parts. As an intermediate alloy, phosphor bronze is widely used in copper casting, solder and other fields, and occupies an important place in the development of the national economy.
