What are the functions of surface treatment of tungsten particles

The surface oxidation control of tungsten particles is a key link in ensuring their performance and extending their service life. Tungsten is very likely to form an oxide layer in air or high temperature environments. This layer of oxide will not only significantly reduce the conductivity and mechanical properties of tungsten, but will also have an adverse impact on subsequent processing processes. Therefore, by forming a dense protective film, such as tungsten oxide or other inert coating on the surface of tungsten particles, the occurrence of oxidation process can be effectively prevented, thereby extending the service life of tungsten. In addition, using a heat treatment process under vacuum or inert atmosphere, the thickness and structure of the surface oxide can be adjusted and the performance of tungsten particles can be further optimized.

Surface coating technology is one of the important means of surface treatment of tungsten particles. By covering the surface of the tungsten particles with metal or non-metallic materials, its fluidity, oxidation resistance, wetting properties and bonding properties with other materials can be significantly improved. For example, coating metal materials such as titanium, aluminum or copper can enhance the mechanical bonding force of tungsten particles and enhance their dispersion and interface bonding strength in the composite material. Non-metallic clad materials such as alumina, silicon oxide or carbide layers can provide excellent high temperature resistance, corrosion resistance and insulation properties, and are widely used in electronic packaging and high temperature resistance materials. A uniform coating deposition can be achieved through advanced processes such as chemical vapor deposition (CVD), physical vapor deposition (PVD), or sol-gel, and high-quality surface coatings can be obtained.

The surface modification of the tungsten particles also includes functionalization treatment, which aims to impart specific functions to the tungsten particles to meet special application needs. In the field of catalysis, the catalytic efficiency and selectivity can be significantly improved by introducing active sites or functional groups on the surface of tungsten particles. In the electronics industry, in order to improve the conductivity of tungsten particles or to achieve regulation of insulation properties, its performance in electronic devices can be optimized by introducing specific functional groups or adjusting the surface charge state. In the application of high-temperature structural materials, the introduction of high-temperature resistant ceramic coatings or carbon-based materials on the surface can effectively enhance the heat resistance and oxidation resistance of tungsten particles.

Surface treatment technology significantly improves the wetting and dispersion of tungsten particles, which is particularly important in the preparation of composite materials or coating materials. By introducing hydrophilic or hydrophobic groups on the surface, the compatibility of tungsten particles with the matrix material can be adjusted, ensuring their uniform dispersion in the composite material, avoiding agglomeration and settlement, thereby improving the overall performance of the material. The use of surface functionalization technology can also reduce the interface energy between tungsten particles and other components, improve the interface bonding strength, and enhance the mechanical properties and durability of composite materials.

In addition, the surface treatment of tungsten particles also involves improving their wear and corrosion resistance. In mechanical processing or high wear environments, surface-strengthening tungsten particles can significantly extend their service life. Through the surface strengthening of ceramic coating, carbonized layer or metal alloy layer, the hardness and wear resistance of tungsten particles are not only improved, but also effectively resist external corrosion such as acid and alkali corrosion and oxidation, ensuring the stability and reliability of tungsten particles in extreme environments. This is of great significance for the application of tungsten in aerospace, nuclear energy, metallurgy and high temperature industries.