High purity copper: 5N, 6N, 7n

Quality: cu99.999% - 99.99999%

Model: high purity copper plate

High purity copper ingot

High purity copper wire

Product performance:

6N, 7n ultra-high purity copper contains very few impurities, so it has the smallest grain boundary area, and there are few lattice defects, which can replace the gold bonding line for making semiconductors.

1. High conductivity: at 4.2K, the resistance of 6N copper is 2.3 × 10-12 Ω m, while that of 4N copper is 1.1 × 10-10 Ω M. The conductivity of 6N copper is about 20 times higher than that of 4N copper at very low temperature.

2. High thermal conductivity: ultra high pure copper has high thermal conductivity at extremely low temperature. The thermal conductivity of 6N copper is 3.0 × 104w / MK at 8K, and that of 4N copper is 3.1 × 103w / MK at 18K.

3. Good ductility: 6N copper has excellent processability, which can be drawn into copper wire with diameter of 20 μ m to 30 μ m, or pressed into thin copper foil. If the sulfur content is very low, the brittleness of copper will disappear at 600k ~ 700k, while the brittleness of 4N copper still exists. When the oxygen content is very low, hydrogen embrittlement will disappear.

4. Low softening temperature: 6N copper softens at 350 K, while 4N copper softens at 440 K. 6N copper can be easily drawn into 20 ~ 30 micron thin wires.