What are the requirements of hafnium silk in the evaporation industry?

1. Purity requirements:

High purity is the key, generally requires the purity of hafnium wire in 99.9% and above. High purity hafnium wire can ensure the stability and consistency of the material in the evaporation process, reduce the influence of impurities on the quality of the evaporation film, and make the evaporated film have good performance and purity.

2. Dimensional accuracy requirements:

Diameter accuracy: the diameter of hafnium wire needs to maintain a high degree of consistency, and usually the diameter error should be controlled in a very small range. For example, for some high-precision evaporation applications, the diameter error of hafnium wire may need to be controlled within ± 0.05mm to ensure the stability of the evaporation rate and evaporation amount of the material during the evaporation process, thus ensuring the uniformity of the film.

Length requirements: according to different evaporation equipment and process requirements, the length of hafnium wire also needs to be accurately controlled. Too long or too short hafnium wire may affect the normal operation and evaporation effect of the equipment.

3. Surface quality requirements:

Finish: the surface of hafnium wire should have a high finish, no obvious scratches, pits, burrs and other defects. The smooth surface can ensure the uniform evaporation of the material during the evaporation process, and avoid the local evaporation rate difference caused by the uneven surface, thus improving the quality of the evaporation film.

Cleanliness: the surface shall be kept clean, free of oil pollution, dust, oxides and other impurities. These impurities may be mixed into the evaporation process, affecting the purity and performance of the film.

4. Mechanical performance requirements:

Strength: The hafnium wire needs to have sufficient strength to withstand the mechanical stress generated during the installation and use process to avoid fracture or deformation. For example, when installing the hafnium wire to the evaporation source of the evaporation equipment, it needs to fix and stretch, which requires the hafnium wire to have a certain strength to withstand the stresses during these operations.

Toughness: good toughness can make hafnium wire is not easy to break when subjected to external force, especially in some complex evaporation process, may need to hafnium wire bending or folding operations, which requires hafnium wire to have a certain toughness to adapt to these operations.

5. Evaporation characteristics requirements:

Evaporation rate: Hfnium wire needs to have a suitable evaporation rate, neither too fast nor too slow. Too fast evaporation rate may cause too fast growth rate of the film, which will affect the structure and performance of the film; too slow evaporation rate will reduce production efficiency and increase production cost.

Evaporative stability:, the evaporation rate and amount of hafnium wire need to be kept stable to ensure the uniformity and consistency of the evaporation film. This requires the material composition, structure and manufacturing process of hafnium silk to have good stability.

6. Chemical stability requirements:

 in the evaporation process, the hafnium wire needs to contact with other materials and gases, so it is necessary to have good chemical stability, to avoid the chemical reaction or interaction with other materials, so as to affect the quality and performance of the evaporation film.