The manufacturing process of the hollow cathode of the barium tungsten emitter generally includes the following steps:
Preparing a porous tungsten substrate
First, a porous tungsten substrate needs to be prepared. These pores are used to adsorb and store active substances in subsequent steps.
Preparing NH4ReO4 (ammonium perrhenate) aqueous solution
Dissolve NH4ReO4 crystal powder in deionized water and heat the solution to above 60°C to completely dissolve the NH4ReO4 crystals.
Adsorbing NH4ReO4 solution
Immerse the porous tungsten substrate in the NH4ReO4 solution so that the porous tungsten substrate adsorbs the NH4ReO4 solution. The pore size of the porous tungsten substrate is usually between 18% and 30% to ensure sufficient adsorption capacity.
Baking and sintering
The porous tungsten substrate adsorbed with the NH4ReO4 solution is baked and sintered to convert it into a W-Re (tungsten-rhenium) substrate. During this process, NH4ReO4 will decompose and release rhenium elements to form a W-Re alloy with the tungsten substrate.
Immersion in aluminate and coating
Immersing aluminate in the W-Re substrate and coating it is to form a stable, low work function emission layer on the cathode surface. This emission layer is the key to the cathode’s ability to emit electrons.
Subsequent processing
Other subsequent processing may be required as needed, such as cleaning, drying, packaging, etc.
Through the above steps, the production of the barium tungsten emitter hollow cathode can be completed. This cathode has efficient electron emission performance, long service life and good stability, and is widely used in various vacuum electronic devices.
It should be noted that the specific production process may vary depending on different materials, equipment and requirements. Therefore, in the actual production process, it is necessary to adjust and optimize according to the specific situation.
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