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AEM Deposition

Thermal Filaments

   

Thermal evaporation is a coating method used as part of the Physical Vapor Deposition process (PVD). The evaporation coils have a very high melting point which can make any metal to be boiled. There is no contamination of the substrates beacuse the high corrosion resistance and outstanding material purity of thermal filaments. AEM provides thermal filaments in a variety of shapes and numbers of wires.

Thermal Filaments Specifications

Materials Tungsten Filaments Molybdenum Filaments
Symbol W Mo
Purity 99.95% 99.95%
Theoretical Density (g/cc) 19.25 10.2
Melting Point (°C) 3,410 2617
Thermal Conductivity 174 W/m.K 139 W/m.K
 

Thermal Filaments Dimensions

Type Number of Strands Coils Length (mm) Length of Coils
(mm)
ID of Coils
(mm)
Diameter of Wires
(mm)
TFC-1 1-strand or 3-strand 6 coils 101.6 mm 44.45 mm 6.35 mm 0.762 mm or 1.905 mm
TFC-2 1-strand or 3-strand 4 coils 101.6 mm 44.45 mm 4.76 mm 0.762 mm or 1.905 mm
TFC-3 1-strand or 3-strand 6 coils 47.625 mm 25.4 mm (1") 4.76 mm 0.762 mm or 1.905 mm
TFC-4 1-strand or 3-strand 4 coils 47.625 mm 25.4 mm (1") 4.76 mm 0.762 mm or 1.905 mm
TFV-5 1-strand or 3-strand - 47.625 mm 6.35 mm - 0.762 mm or 1.905 mm
TFV-6 1-strand or 3-strand - 47.625 mm 25.4 mm - 0.762 mm or 1.905 mm
The customized size can be porvided accroding to customer's drawings.
 

Drawings of Thermal Filaments

   
TFC-1   TFC-2   TFC-3
   
TFC-4   TFV-5   TFV-6
 

Classifications of Thermal Filaments

1. Point and Loop Heaters
2. Coil Heaters
3. Basket Heaters
4. Spiral Heaters

Applications of Thermal Filaments

1. Offer good heat transfer.
2. Mostly inert in contact with hot metals.
3. Evaporate metals do not wet alumina, resulting in the melt forming a "sphere" that acts as a point source.
4. Heat resistance does not change throughout the deposition since evaporant does not touch the underlying material.
5. Work well while thermally evaporating gold.