Method for preparing pressed scandia-doped dispenser cathodes using microwave sintering
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United States of America Patent
Stats
-
May 12, 2020
Grant Date -
Nov 30, 2017
app pub date -
Jan 19, 2017
filing date -
May 27, 2016
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present disclosure discloses a preparation method of pressed Scandia-doped dispenser cathode using microwave sintering. Embodiments of the present disclosure include dissolving some nitrates and ammonium metatungstate with deionized water to prepare a homogeneous solution. Precursor powder with uniform size is obtained by spray drying, the precursor powder is decomposed, and two-step reduction may be proceeded to form doped tungsten powder with uniform element distribution. The cathode is prepared by one-time microwave sintering. One-time forming of cathode sintering is realized, and sintering shrinkage and sintering time are reduced significantly. The method has excellent repeatability, and the cathode has a homogeneous structure and excellent emission performance at 950° C.
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International Classification(s)
- 2017 Application Filing Year
- H01J Class
- 2316 Applications Filed
- 1735 Patents Issued To-Date
- 74.92 % Issued To-Date
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- 0 Citation Count
- H01J Class
- 0 % this patent is cited more than
- 5 Age
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