By doping the tungsten with aluminium- potassium silicate followed by intense deformation it is possible to produce tungsten alloys with a high form stability and a high corrosion resistance against various molten metals (WVM) or high grain stability (WVMW). WVM has a nominal chemical composition of 0.005 K in weight%, WVMW of 0.002 K in weight%.
Advantages compared to pure W:
- higher recrystallization temperature
- elongated grain structure after recrystallization (WVM for Ø/thickness < 1 mm)
- grain stability
- higher creep strength (WVM for Ø/thickness < 1 mm)
- higher arc stability
Typical areas of application:
- electrodes for discharge lamps in the lighting industry
- boats and coils for resistive evaporation
- stationary anodes for the medical technology
- heating elements for the high temperature furnace construction
