Adding tin to copper (forming copper-tin alloy, or bronze) significantly alters the various properties of copper and is widely used in industry and daily life. Here is a summary of the detailed effects:

Mechanical performance improvement

1. Hardness and strength increase significantly

The addition of tin makes bronze's hardness and tensile strength higher than pure copper. The higher the tin content, the greater the hardness and strength.

For example, bronze with a 10% tin content has an tensile strength of up to 590 MPa, much higher than pure copper.

2. Abrasion resistance improves

Bronze, due to its increased hardness, has excellent wear resistance and is often used to manufacture high-friction components such as bearings, gears, and shaft sleeves.

3. Brittleness increases, plasticity decreases

If the tin content is too high (e.g., >15%), the alloy's brittleness increases, plasticity decreases, and processing becomes more difficult.

Changes in physical properties

1. Conductivity decreases

Pure copper has excellent conductivity, but adding tin significantly reduces conductivity. The conductivity of tin bronze is approximately 15% - 28% of pure copper.

Therefore, bronze is not suitable for electrical wi but can be used for electronic contacts, connectors, etc. with lower conductivity requirements.

2. Thermal conductivity decreases

The addition of tin reduces the conductivity of copper, but it is still better than many other metal materials and is suitable for applications with moderate heat dissipation requirements.

3. Melting point decreases

The melting point of bronze is lower than that of pure copper, approximately 800 - 950°C, making it easier to cast and process.

Chemical performance improvement

1. Corrosion resistance significantly enhances

Tin can form a dense oxide film on the copper surface, effectively preventing further oxidation and corrosion, especially in seawater and humid environments. Therefore, bronze is widely used in ships, marine engineering, and chemical equipment.

2. Oxidation resistance improves

Bronze is more stable in high-temperature and atmospheric conditions, less prone to copper green, and has stable performance over the long term.

Process performance optimization

1. Casting performance is excellent

Bronze has a low melting point and good fluidity, making it suitable for complex castings such as sculptures, mechanical parts, valves, etc.

2. Processing performance is good

Bres with high conductivity requirements, but can be used for electronic contacts, connectors, etc. with lower conductivity requirements.

Typical application fields

Mechanical manufacturing: bearings, gears, turbines, pumps and valves, wear-resistant parts.

Shipping and marine engineering: propellers, valves, seawater pipelines.

Electronics and electrical: contacts, switches, connectors, conductive springs (requiring balance of conductivity).

Cultural arts: sculptures, bells and drums, musical instruments, commemorative coins.