What Is Oxygen Free Copper?
Pure copper without oxygen and without any deoxidizer residue. But it still contains very trace oxygen and some impurities. According to the standards, the content of oxygen is not greater than 0.003%, the total content of impurities is not greater than 0.05%, and the purity of copper is greater than 99.95%.
- Oxygen-free copper
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- Strict distinction, oxygen-free copper should be divided into ordinary oxygen-free copper and
- Oxygen copper rods and oxygen-free copper rods have different characteristics due to different manufacturing methods.
- 1) About the inhalation and desorption of oxygen and its existence
- The oxygen content of cathode copper used in the production of copper rods is generally 10-50 ppm.
- Copper has high electrical and thermal conductivity, good solderability, excellent plasticity and ductility, excellent cold workability and non-magnetic, and dispersed oxygen-free copper overcomes the lower yield strength after annealing and high temperature Disadvantages of poor creep resistance, such as high temperature, high strength and high thermal conductivity, are highly valued by experts in electronic materials. At present, copper and its alloys have been widely used in the electronics industry. In vacuum electronic devices, oxygen-free copper has ranked first in the seven major structural materials in this field.
- Oxygen content is one of the most important properties of oxygen-free copper. Due to the small solid-melt amount of oxygen and copper, the oxygen in oxygen-free copper actually exists in the form of Cu 2 O. At high temperatures, hydrogen diffuses in copper at a great rate, encounters Cu 2 O and reduces it, producing a large amount of water vapor. The amount of water vapor is proportional to the oxygen content of copper. For example, copper with 0.01% oxygen content will form 14 cm 3 of water vapor in 100 g of copper after annealing. This water vapor cannot be diffused through dense copper, so it will generate several gigapascals where Cu 2 O is present. Pressure, which causes the copper to break and produce brittle cracks and loses vacuum compaction. Therefore, the oxygen content must be strictly limited. [4]