There are many ways to improve the life of tungsten wire through material modification. The following are some of the main strategies:
- Adding second phase particles
Adding second phase particles, such as ThO2 particles, to tungsten wire can effectively prevent the growth of grains during heating. When the volume fraction and radius of ThO2 particles are selected appropriately, the grains can be significantly refined, thereby improving the strength and toughness of tungsten wire. This is because the refined grains can reduce the brittleness of the performance caused by grain growth, thereby extending the service life of tungsten wire.
- Forming micro-voids
During the sintering process of tungsten wire, by adding a small amount of impurities such as K, Al, Si, these impurities will vaporize during sintering to form tiny bubbles, thereby forming micro-voids in the tungsten wire. These voids can inhibit the growth of grains, and also help to improve the strength and toughness of tungsten wire. In addition, the formation of micro-voids can also improve the thermal expansion properties of tungsten wire, reduce the stress concentration caused by thermal expansion and contraction, and further extend the service life of tungsten wire.
- Adding iodine
Adding a small amount of iodine to tungsten wire can form a uniform and dense iodide layer covering the surface of tungsten wire. This iodide layer can improve the oxidation resistance, corrosion resistance and thermal stability of tungsten wire. Specifically, the tungsten iodide layer can prevent the formation of tungsten oxide, thereby slowing down the oxidation rate of tungsten wire; at the same time, it can also improve the corrosion resistance of tungsten wire and reduce Reduce the performance degradation caused by chemical corrosion; in addition, the tungsten iodide layer can also reduce the thermal expansion coefficient of the tungsten wire and improve its thermal stability. All of these help to extend the service life of the tungsten wire.
- Alloying treatment
Tungsten can be alloyed with other metal elements to form a solid solution or intermetallic compound. These alloying elements can change the microstructure of tungsten and improve its strength and toughness. At the same time, alloying treatment can also improve the thermophysical and mechanical properties of tungsten wire, making it better adapted to working conditions in high temperature environments. Through reasonable alloying design, the life of tungsten wire can be significantly improved.
- Surface treatment technology
Special treatment of the surface of tungsten wire, such as coating, can also increase its service life. These surface treatment technologies can form a protective layer on the surface of tungsten wire to reduce the erosion and damage of the tungsten wire by the external environment. At the same time, these protective layers can also improve the wear resistance, corrosion resistance and oxidation resistance of tungsten wire, thereby extending its service life.
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