There are many methods for preparing barium tungsten alloy cathode material. The following is one of the common preparation processes:
Preparing NH4ReO4 (ammonium perrhenate) aqueous solution
Dissolve NH4ReO4 crystal powder in deionized water and heat the solution to above 60°C to ensure that the NH4ReO4 crystals are completely dissolved.
Adsorbing NH4ReO4 solution
Immerse the sintered porous tungsten substrate in NH4ReO4 solution so that the porous tungsten substrate absorbs NH4ReO4 solution. The porosity of the porous W substrate is usually controlled between 18% and 30%.
Baking and sintering
The porous tungsten substrate adsorbed with NH4ReO4 solution is baked and sintered to convert it into a W-Re substrate. This step helps to improve the doping uniformity of Re in the W substrate.
Immersing in aluminate and coating
Immerse aluminate in the W-Re substrate and coat it to complete the manufacture of tungsten-rhenium-based barium tungsten cathode.
In addition, there is another simple preparation method:
Preparation of tungsten cathode green embryo
Put tungsten powder into a mold and perform bidirectional pressing with a steel mold to obtain a tungsten cathode green embryo.
Pressing and sintering
Put the alumina crucible containing the cathode green embryo into an auxiliary heat preservation and heating device, and then pre-sinter and sinter. By precisely controlling the heating rate and heat preservation time, ensure that the cathode green embryo is converted into a tungsten matrix with the required pore structure.
Applying active salt
A layer of 411 active salt is uniformly applied on the surface of the prepared cathode, and after high-temperature impregnation, it is cooled to room temperature by water.
Post-treatment
The cathode coated with active salt is washed, dried and annealed to obtain the final barium tungsten cathode.
These preparation processes can ensure that the barium tungsten alloy cathode material has a good pore structure, high electron emission performance and stable working performance. In practical applications, the process parameters can also be adjusted according to specific needs to obtain a barium tungsten alloy cathode material with better performance.
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