Mechanical Engineering - Engineering Materials - Discussion

The correct answer is: 1.

Phosphor bronze is a type of copper alloy that contains:

- 89-90% copper.
- 9-10% tin.
- 1% phosphorus.

A small amount of phosphorus (1%) is added to the alloy to:

- Improve strength and hardness.
- Increase corrosion resistance.
- Enhance wear resistance.
- Reduce oxidation.

The other options are not correct because:

- 0.1% phosphorus is too low to have a significant impact on the alloy's properties.
- 11.1% phosphorus is too high and would likely result in a brittle and undesirable alloy.
- 98% phosphorus is not a feasible or practical composition for phosphor bronze, as it would be difficult to work with and would likely have poor mechanical properties.

The exact composition of phosphor bronze may vary slightly depending on the specific application and manufacturer.

Phosphor bronze : When bronze contains phosphorus, it is called phosphor bronze. Phosphorus increases the strength, ductility and soundness of castings. This alloy possesses good wearing qualities and high elasticity.

A common type of phosphor bronze has the following composition according to Indian standards Copper 87-90%, Tin = 9-10%, and Phosphorus = 0.1-3%.

The material is specified for pump parts, gears, springs, power screw nuts and bearings.

Phosphor bronze is a bronze composed of 80% Cu (copper), 10% Sn (Tin), 9% Sb (Antimony) and 1% Phosphorous.

It is .1 to .3%.