C14500 Tellurium Bronze Rod has applications in the production of hot forged products, high-speed screw machine products and parts requiring high conductivity, extensive machining, corrosion resistance, copper color, or a combination of these. The addition of tellurium enhances the strength of the copper alloy and assists in chip breakage, allowing for much higher machining speeds and ultimately longer tool life than with pure copper in high-speed screw machines.
Chemical Composition (ASTM B301)
| Element | Content Range (wt%) | Notes |
|---|---|---|
| Copper (Cu) | 99.4 - 99.6% (min 99.2%) | Base element |
| Tellurium (Te) | 0.40 - 0.70% | Improves machinability |
| Phosphorus (P) | 0.004 - 0.012% | Deoxidizer |
| Other (total) | ≤ 0.10% | Impurities |
Physical properties
- Density: approximately 8.94 g/cm³, close to that of pure copper.
- Melting point: 1083°C (similar to that of pure copper).
- Conductivity: ≥85% IACS (International Annealed Copper Standard), close to pure copper (100% IACS), superior to most copper alloys.
- Thermal conductivity: approximately 380 W/(m·K), suitable for heat dissipation scenarios.
- Thermal expansion coefficient: 17.0×10⁻⁶/°C (20°C~300°C), compatible with most metals.
mechanical properties
- Tensile strength: approximately 220~250 MPa in the soft state (annealed), and up to 350~400 MPa in the hard state (cold-worked).
- Yield strength: approximately 70~100 MPa in the soft state, increasing to 300~330 MPa in the hard state.
- Elongation: ≥30% in soft state, reduced to 10%~15% in hard state.
- Hardness: Soft temper Brinell hardness (HB) is approximately 45~60, and the hard temper can reach HB 80~100.
- Machinability: It is 80% to 90% of pure copper (with reference to free-cutting brass C36000, which is 100%), allowing for high-speed machining and high surface finish.
Machining and manufacturing processes
- Cutting processes: suitable for processes such as turning, milling, and drilling. It is recommended to use carbide cutting tools, with the assistance of coolant to extend tool life.
- Cold working: Improve hardness and strength through cold rolling and cold drawing, but the amount of deformation needs to be controlled to avoid cracking.
- Welding: Resistance welding and laser welding can be employed, but high temperatures may lead to the volatilization of tellurium, necessitating control of heat input.
- Heat treatment: The annealing temperature is typically between 400°C and 600°C, used to eliminate cold work stress and restore plasticity.
Available Shape and Size
|
HOLLOW RODS |
Min Bore Size 20 mm and Max OD 100 mm |
|
ROUND RODS |
8mm To 100 mm |
|
HEX |
10mm To 60mm |
|
SQUARE |
10mm To 60mm |
|
FLAT |
10mm Min Thickness and max Width 120mm |
|
INGOTS |
As per Specification |
Test Equipment
Applications
- Electronic connector: 5G base station, new energy vehicle battery connection piece
- Switch components: relay, circuit breaker contact
- Welding electrode: resistance welding head, spot welding electrode
- Heat conduction element: radiator substrate, semiconductor package
Why copper tellurium?
Compared to ordinary copper alloys, tellurium copper can reduce machining time by more than 30% in precision machining scenarios, while extending part life by 2-3 times. Its balanced cost performance meets the development trend of lightweight and efficient industrial equipment.
FAQ
Q1: What are the main components of copper tellurium?
A: Tellurium copper usually contains more than 99% copper (Cu), tellurium (Te) 0.4-0.7%, some models add phosphorus (P) to improve the deoxidation effect.
Q2: Does the electrical conductivity of copper tellurium decrease due to processing?
A: Through the precise temperature-controlled thermal treatment process, copper tellurium can recover more than 95% conductivity after cold processing to ensure stable performance.
Q3: What surface treatments is tellurium copper suitable for?
A: Support silver plating, nickel plating, passivation and other processing, it is recommended to degreasing and pickling before pretreatment to improve adhesion.
Q4: How to distinguish copper tellurium from copper chromium zirconium?
A: Tellurium copper has better cutting ability and lower cost, while chromium zirconium copper (CuCrZr) focuses on high-strength wear resistance scenarios.
Q5: What is the corrosion resistance of copper tellurium?
A: Corrosion resistance in conventional industrial environment is better than pure copper, but strong acid and alkali environment is recommended to use with surface coating.
Q6: What parameters are required when ordering copper tellurium?
A: It is necessary to specify the alloy grade (such as C14500), state (hard/semi-hard), dimensional tolerance and testing standard (ASTM/GB).
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