What are the surface treatment methods of solid molybdenum wire

In the field of molybdenum wire surface treatment, oxidation treatment technology achieves directional optimization of material properties by precisely controlling the generation mechanism of oxide film. Specifically, the molybdenum wire is placed in a specific oxidizing atmosphere, and a molybdenum dioxide (MoO₂) oxide layer is formed on its surface under high temperature conditions. This oxide layer is uniformly generated on the surface of the molybdenum metal matrix through a solid-phase reaction mechanism, and its thickness is closely related to the oxidation temperature, atmosphere composition and treatment time. In the high temperature environment of the ferroalloy melt, the MoO₂ oxide layer not only effectively blocks the direct contact between the metal matrix and the external environment, but also significantly improves the corrosion resistance of the molybdenum wire through the microstructure regulation of the oxide film. This surface modification technology is particularly suitable for the manufacture of electrochemical sensors in high temperature environments, and the stability of its oxide film ensures the long-term stable operation of the sensor under extreme working conditions.

Mechanical grinding technology, as an important means of fine processing of molybdenum wire surface, uses the combined application of abrasives of different particle sizes to achieve precise control of surface roughness. Through a multi-stage grinding process, coarse-grained abrasives are first used to remove surface processing defects, and then fine-grained abrasives are used to improve surface finish. After the forming processes such as drawing and forging, the surface roughness of the molybdenum wire treated by mechanical grinding can be reduced to the micron level, which significantly improves the tribological properties of the material. This technology is particularly applicable in the field of online cutting processing. The improvement of surface finish effectively reduces the friction resistance during cutting, prolongs the service life of the molybdenum wire, and improves the cutting accuracy.

Chemical treatment technology constructs a composite layer with specific functions on the surface of the molybdenum wire through chemical reactions in the solution. For example, in the electroplating process, a metal coating can be deposited on the surface of the molybdenum wire by controlling the electrolyte composition and current density. This coating not only enhances the corrosion resistance of the material, but also realizes the customized design of the conductive performance by optimizing the coating composition. In addition, in the anodizing treatment, the electrochemical principle is used to generate an aluminum oxide film on the surface of metals such as aluminum and molybdenum. The oxide film has protective, decorative and insulating properties, and is particularly suitable for packaging materials of electronic components.

Composite surface treatment technology comprehensively improves the performance of molybdenum wire through the synergistic effect of multiple processes. For example, taking SiC-based composite materials as an example, a MoSi₂/Mo₅Si₃ composite interface layer is formed on the surface of molybdenum wire through a molten silicon infiltration process. This interface layer forms a metallurgical bond with the molybdenum wire matrix through a solid-phase reaction mechanism, significantly enhancing the material's resistance to crack propagation. In a three-point bending test, the composite material exhibited quasi-plastic damage characteristics in the temperature range of 20°C to 1500°C. This performance breakthrough provides a new technical path for the design of high-temperature structural materials and promotes the application prospects of molybdenum wire in aerospace, nuclear energy, and high-temperature industrial equipment.