Chromium Copper (UNS C18200)
Copper C18200 is a high-conductivity chromium copper alloy. It falls under the category of precipitation-hardened copper alloys, which are known for their excellent electrical and thermal conductivity combined with high strength and hardness.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Copper | 98.0% | 99.4% |
| Chromium | 0.6% | 1.2% |
| Iron | —— | 0.1% |
| Lead | —— | 0.05% |
| Silicon | —— | 0.1% |
| Residuals | —— | 0.5% |
The following table provides a list of copper C18200 properties in both SI and US customary/Imperial units.
Click on the icon to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Density | 8890 kg/m3 |
| Mechanical Properties | Metric |
| Tensile Strength (Ultimate) | 310 - 530 MPa |
| Tensile Strength (Yield) | 100 - 450 MPa |
| Shear Strength | 210 - 320 MPa |
| Young’s Modulus (E) | 117 GPa |
| Shear Modulus (G) | 50 GPa |
| Elongation at Break | 10 - 40% |
| Poisson’s Ratio (ν) | 0.3 |
| Thermal Properties | Metric |
| Melting Point | 1070 °C |
| Thermal Conductivity | 320 W/m·K |
| Specific Heat Capacity (Cp) | 385 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 1.76×10-5 1/°C |
| Electrical Properties | Metric |
| Electrical Conductivity | 4.64×107 S/m |
| Electrical Resistivity | 2.2×10-8 Ω·m |
The values in this table are approximate and can vary depending on various factors such as the specific manufacturing process and heat treatment applied to the alloy.
Advantages & Disadvantages of Copper C18200
| Advantages | Disadvantages |
|---|---|
| High Electrical Conductivity | High Cost |
| High Thermal Conductivity | Limited Availability |
| Good Corrosion Resistance | Lower Ductility |
| High Strength and Hardness |
Applications of Copper C18200
Copper C18200 finds application in various industries and sectors where its combination of high conductivity, strength, and corrosion resistance is advantageous. Here are some common applications of Copper C18200:
- Electrical connectors and terminals: Copper C18200 is widely used in electrical connectors, terminals, and conductive components where high electrical conductivity is essential. Its excellent conductivity allows for efficient transmission of electrical signals and power.
- Resistance welding electrodes: The high strength and thermal conductivity of Copper C18200 make it suitable for resistance welding electrodes. It can withstand the high heat generated during the welding process and efficiently dissipate heat, ensuring consistent and reliable welds.
- Switches and electrical contacts: This alloy is employed in switches and electrical contact components that require good conductivity, durability, and resistance to corrosion. It ensures reliable electrical performance and longevity in demanding environments.
- Heat sinks and heat exchangers: Copper C18200’s high thermal conductivity makes it suitable for heat sinks and heat exchangers. It efficiently transfers heat away from electronic components, helping to dissipate and regulate temperature effectively.
- Injection mold cores and cavities: The combination of strength and high thermal conductivity makes Copper C18200 suitable for use in injection mold cores and cavities. It helps to cool and solidify the molten plastic efficiently, allowing for faster production cycles and improved part quality.
- Welding and brazing fixtures: The hardness and strength of Copper C18200 make it suitable for welding and brazing fixtures. It can withstand the mechanical stresses and high temperatures associated with these processes, providing stability and reliability.
- Power transmission components: Copper C18200 is used in power transmission components such as bus bars, current-carrying conductors, and transformer windings. Its high conductivity ensures efficient power transfer and minimizes energy losses.
- Electronic components: This alloy is utilized in various electronic components, including connectors, printed circuit boards (PCBs), and semiconductor packages. Its conductivity and corrosion resistance are crucial for reliable electronic performance.