SU111243A1 - A method of manufacturing pressed cathodes based on barium tungstate or barium tungstate-calcium - Google Patents
A method of manufacturing pressed cathodes based on barium tungstate or barium tungstate-calciumInfo
- Publication number
- SU111243A1 SU111243A1 SU572240A SU572240A SU111243A1 SU 111243 A1 SU111243 A1 SU 111243A1 SU 572240 A SU572240 A SU 572240A SU 572240 A SU572240 A SU 572240A SU 111243 A1 SU111243 A1 SU 111243A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- barium tungstate
- calcium
- tungstate
- barium
- cathodes based
- Prior art date
Links
Landscapes
- Powder Metallurgy (AREA)
- Solid Thermionic Cathode (AREA)
Description
Предметом изобретени вл етс способ изготовлени прессованных катодов на основе вольфрамата бари или вольфрамата бари -кальци с применением в качестве восстановител алюмини .The subject of the invention is a process for the manufacture of pressed cathodes based on barium tungstate or barium calcium tungstate using aluminum as a reducing agent.
При существующем способе алюминий вводитс в смесь порошков вольфрама и вольфрамата бари . Затем смесь прессуетс и спекаетс . При таком способе введени алюмини часто наблюдаетс образование кратеров на поверхности катода изза резкого увеличени объема частиц алюмиин вследствие их термического расширени .With the existing process, aluminum is introduced into a mixture of powders of tungsten and barium tungstate. The mixture is then pressed and sintered. With this method of introducing aluminum, craters are often observed to form on the cathode surface due to a sharp increase in the volume of aluminum particles due to their thermal expansion.
Предложенный способ предусматривает введение алюмини в порошок вольфрама с последующим спеканием их в атмосфере водорода при 700° в течение 30 минут. Порошок сплава смешиваетс с порошком вольфрамата бари или вольфрамата бари -кальци , смесь прессуетс и спекаетс обычным путем. При таком способе введени алюмини не .наблюдаетс кратеров на поверхности катодов, вследствие чего последние имеют высокую эмиссионную способность и большую долговечность . При введении алюмини указанным способом получаютс катоды , дающие эмиссии плотностью до 10 а/см с долговечностью более 1000 часов.The proposed method involves the introduction of aluminum into tungsten powder, followed by sintering them in an atmosphere of hydrogen at 700 ° for 30 minutes. The alloy powder is mixed with the powder of barium tungstate or barium tungstate, the mixture is pressed and sintered in the usual way. With this method of introducing aluminum, there are no craters on the surface of the cathodes, as a result of which the latter have a high emissivity and greater durability. With the introduction of aluminum in this way, cathodes are obtained that give emissions with a density of up to 10 A / cm with a durability of more than 1000 hours.
Предмет изобретени Subject invention
Способ изготовлени прессованных катодов на основе вольфрамата бари или вольфрамата бари -кальци с применением в качестве восстановител алюмини , отличающийс тем, что, с целью исключени образовани на эмиттируюнтеи поверхности катодов кратеров, снижающих эмиссию и долговечность катодов, алюминии вводитс п состав смеси дл прессовани не непосредственно, а в виде порошкообразного его спека в необходимо пропорции с вольфрамо.м, иолуче ного прокалива) в водороде щгл 700°.A method of making pressed cathodes based on barium tungstate or barium calcium tungstate using aluminum as a reducing agent, characterized in that, in order to eliminate craters on the emitting surface of the cathodes, which reduce the emission and durability of the cathodes, aluminum is introduced directly into the composition of the mixture for pressing , and in the form of its powdery cake, in the necessary proportion with tungsten, m and calcined calcined) in 700 g of hydrogen in 700 g.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU572240A SU111243A1 (en) | 1957-04-30 | 1957-04-30 | A method of manufacturing pressed cathodes based on barium tungstate or barium tungstate-calcium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU572240A SU111243A1 (en) | 1957-04-30 | 1957-04-30 | A method of manufacturing pressed cathodes based on barium tungstate or barium tungstate-calcium |
Publications (1)
Publication Number | Publication Date |
---|---|
SU111243A1 true SU111243A1 (en) | 1957-11-30 |
Family
ID=48383895
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU572240A SU111243A1 (en) | 1957-04-30 | 1957-04-30 | A method of manufacturing pressed cathodes based on barium tungstate or barium tungstate-calcium |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU111243A1 (en) |
-
1957
- 1957-04-30 SU SU572240A patent/SU111243A1/en active
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