Description
Overview Of CuCrZr
CuCrZr is a high-strength, high-conductivity copper alloy widely used in electrical engineering, aerospace, and thermal management applications. Known for its excellent combination of electrical/thermal conductivity, mechanical strength, and resistance to softening at elevated temperatures, CuCrZr powder is optimized for additive manufacturing (AM) and powder metallurgy processes to produce components requiring durability and efficient heat/current transfer.
Powder Chemical Composition(wt,-%)
Typical composition of CuCrZr powder (per ASTM B624 and ISO 5182 standards):
| Element | Content (wt%) | Role |
| Copper (Cu) | Balance (≥98.5%) | Base metal, ensures high electrical/thermal conductivity |
| Chromium (Cr) | 0.5–1.2% | Enhances strength and wear resistance via precipitation hardening |
| Zirconium (Zr) | 0.03–0.3% | Improves grain refinement and high-temperature stability |
| Iron (Fe) | ≤0.1% | Impurity control |
| Oxygen (O) | ≤0.05% | Minimizes oxide formation |
| Others | ≤0.1% | Trace elements (e.g., Si, Al) |
Physical & Mechanical Properties
Key properties of CuCrZr in as-sintered and aged conditions:
| Property | As-Sintered | Aged (400–500°C) |
| Tensile Strength (MPa) | 300–350 | 350–450 |
| Yield Strength (MPa) | 250–300 | 300–400 |
| Elongation at Break (%) | 15–25 | 10–20 |
| Hardness (HV) | 80–100 | 100–130 |
| Electrical Conductivity | 75–85% IACS | 70–80% IACS |
| Thermal Conductivity | 320–360 W/m·K | 300–340 W/m·K |
| Density (g/cm³) | 8.8–8.9 | 8.8–8.9 |
| Melting Point (°C) | 1080–1085 | 1080–1085 |
Advantages
| Aspect | CuCrZr | Pure Copper | CuBe Alloys |
| Strength | High (450 MPa) | Low (200 MPa) | Very High (600–1400 MPa) |
| Conductivity | High (80% IACS) | Very High (100% IACS) | Moderate (20–50% IACS) |
| Cost | Moderate | Low | High |
| Toxicity | Non-toxic | Non-toxic | Toxic (Be content) |
Note: Surface oxidation during AM processes must be minimized (e.g., using inert gas shielding) to maintain conductivity. Post-processing (e.g., HIP, machining) may be required for critical applications.
Key Features
High Thermal & Electrical Conductivity
● Retains >75% IACS conductivity even after aging, ideal for electrical contacts and heat exchangers.
Precipitation Hardening
● Cr and Zr form fine precipitates (e.g., CrCu₂, ZrCu₃) during aging, significantly enhancing strength without drastic conductivity loss.
Thermal Stability
● Resists softening up to 500°C, suitable for high-temperature environments (e.g., rocket nozzles, welding electrodes).
Additive Manufacturing Compatibility
● Used in laser powder bed fusion (LPBF) and binder jetting for complex geometries like cooling channels in electronic devices.
Primary Applications
Electrical Engineering
● Resistance welding electrodes, circuit breakers, and busbars.
Aerospace
● Rocket engine liners, thrust chambers, and heat sinks.
Electronics
● Heat sinks, lead frames, and high-power semiconductor substrates.
Automotive
● High-performance connectors and hybrid vehicle battery components.
