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Agar Scientific

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Filaments

Filaments

Agar tungsten filaments are made with specially designed jigs which ensure accuracy and reproducibility in production. High-ductility tungsten wire is used to minimise strain. All filaments are stress relieved by flashing in a vacuum at temperatures above the normal operating level, and are then checked for accuracy of centring. Filament assemblies having alignment screws are subsequently adjusted using a light microscope to ensure that they are ready for immediate operation in the electron microscope. We can also accept most types of filaments for repair provided the bases are in good condition. If the insulators need replacement, these will be changed (if available) and charged additionally to the standard cost for replacing the filament. Repaired filaments are given the same exacting care as our new filaments; all filaments are pre-flashed in a vacuum to promote stability in operation, and those filaments on bases provided with adjustment screws are subsequently re-centred under a light microscope. The filaments sent for repair must be in a suitable transit box or tube so that the repaired filaments can be returned safely.

Kimball Physics single crystal lanthanum hexaboride (LaB6) cathodes are available for most makes of electron microscopes and other electron beam instruments where a suitable gun vacuum in the region of 10-7 Torr is attainable. The filament heater can then be driven by the normal power supply of the microscope.

For SEM applications, the higher brightness provides better imaging resolution and improved efficiency for microanalysis. For TEM, the low energy spread of the LaB6 filament is particularly advantageous for high resolution imaging. Alternatively, LaB6 filaments may be used where a long filament life is important; lifetimes in excess of six months continuous operation are regularly achieved.

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4 Item(s)

  1. Agar Scientific tungsten filaments for SEM and TEM

    Agar Scientific tungsten filaments for SEM and TEM

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    High quality replacement tungsten filaments for Cambridge, LEO, Zeiss, AEI, FEI, JEOL, Siemens, Camscan, ISI electron and TESCAN microscopes.
  2. Electron Microscope Filaments

    Electron Microscope Filaments

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    Replacement filaments for Hitachi, JEOL and Zeiss electron microscopes.
  3. Filament repair service

    Filament repair service

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    Agar provides a repair service for most types of Tungsten filaments.
  4. Lanthanum hexaboride filaments

    Lanthanum hexaboride filaments

    More Information

    Kimball Physics single crystal lanthanum hexaboride (LaB6) cathodes are available for most makes of electron microscopes and other electron beam instruments.

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4 Item(s)