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Light Source Materials—Production of Pure Iron
In industry, iron is one of the most widely used metals. Its light gray appearance and high melting point (1535°C) make it valuable for numerous applications. With a density of 7.87, iron possesses good physical properties. However, due to the difficulty of cleaning and degassing, pure iron has relatively limited use in the production of electro-vacuum devices. In the electro-vacuum field, pure iron is typically employed only under conditions where heating temperatures are not excessively high.
Applications of Pure Iron in the Electro-Vacuum Industry
The most commonly used iron materials in electro-vacuum devices are Amek steel and low-carbon steel. Amek steel contains no more than 0.05% carbon, while low-carbon steel typically has carbon impurities not exceeding 0.1%. These materials offer excellent electrical conductivity and thermal stability, meeting the stringent material requirements of electro-vacuum equipment.
Methods for Producing Pure Iron
Various methods exist for producing pure iron, with the carbonylation process being the most common. This method, similar to nickel production, involves reacting iron with carbonyl to form iron-containing carbonyl compounds. Ultimately, the resulting carbonyl powder is converted into bulk metal through powder metallurgy techniques. During this process, carbon content is strictly controlled to not exceed 0.01%, while other impurities (such as manganese, silicon, phosphorus, and sulfur) are also rigorously limited to ensure they do not exceed 0.02%.
Beyond carbonylation, electrolysis is another common method for iron production. During electrolysis, pure iron is extracted from chemically pure salt solutions via precipitation reactions. To further enhance purity, the resulting iron powder undergoes purification steps like hydrogen annealing and vacuum melting to eliminate impurities.
Application Prospects of Pure Iron
Although pure iron faces certain limitations in electro-vacuum devices, technological advancements and the emergence of increasingly sophisticated purification and degassing techniques are expanding its potential applications across diverse fields. Particularly in high-precision equipment, the superior properties of pure iron materials remain irreplaceable.
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#Electrolysis
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#HighPurityIron
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