Tungsten wire may indeed have microcracks during processing. This situation may be caused by many factors. The following are some of the main reasons:
Raw materials and manufacturing process problems:
If the tungsten powder raw materials used are impure and contain more impurities, these impurities may cause cracks during sintering.
Certain links in the manufacturing process, such as pressing, sintering and drawing, may also cause microcracks inside the tungsten wire if they are not properly controlled.
Microstructure influence:
The microstructure of tungsten wire, including grain size, shape and distribution, will affect its crack resistance. If the grains are too large or unevenly distributed, stress concentration may occur during processing, leading to cracks.
Stress during processing:
During the processing, tungsten wire will be subjected to various forces, such as stretching, bending and compression. If the stress exceeds the strength limit of tungsten wire, cracks will occur. Especially during the drawing process, if the deformation is too large or the drawing speed is too fast, micro cracks may occur inside the tungsten wire.
Improper annealing:
Annealing is an important link to eliminate processing stress and improve the performance of tungsten wire. However, if the parameters such as annealing temperature, time and atmosphere are not properly controlled, new cracks may occur inside the tungsten wire or the original cracks may expand.
In order to reduce or avoid micro cracks in tungsten wire during processing, the following measures can be taken:
Use high-purity tungsten powder raw materials to reduce the impact of impurities on the performance of tungsten wire.
Optimize the manufacturing process, such as improving the process parameters of pressing, sintering and drawing to reduce processing stress.
Control the microstructure of tungsten wire, such as refining the grains by adding appropriate amounts of alloying elements or compounds to improve the crack resistance of tungsten wire.
Reasonable annealing treatment, select appropriate annealing temperature, time and atmosphere and other parameters to eliminate processing stress and improve the performance of tungsten wire.
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