AT131776B - Wehnelt cathode and process for making the same. - Google Patents
Wehnelt cathode and process for making the same.Info
- Publication number
- AT131776B AT131776B AT131776DA AT131776B AT 131776 B AT131776 B AT 131776B AT 131776D A AT131776D A AT 131776DA AT 131776 B AT131776 B AT 131776B
- Authority
- AT
- Austria
- Prior art keywords
- making
- wehnelt
- same
- nickel
- cathode
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 4
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 6
- 239000010953 base metal Substances 0.000 claims description 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 3
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 239000011162 core material Substances 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Landscapes
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
Description
<Desc/Clms Page number 1>
WehneltkathodeundVerfahrenzurHerstellungderselben.
Für Wehneltkathoden. welche durch Auftragen von geeigneten Verbindungen der Erdalkalimetalle, die bei ihrer durch Erhitzung erfolgenden Zersetzung im Vakuum die aktiven Oxyde ergeben, z. B, durch Auftragen der Karbonate oder Nitrate der Erdalkalimetalle und Erhitzen im Vakuum hergestellt werden, ist schon verschiedenes Kerndrahtmaterial vorgeschlagen worden.
EMI1.1
bewährt. Das aktive Material hat nach Zersetzung der aufgebrachten Verbindung sofort genügende.
Emission, ohne dass die Kathode nach ihrer Herstellung einer langandauernde Wärmebehandlung. dem sogenannten Formieren, zu unterwerfen wäre. Die geringe mechanische Festigkeit des metallischen Nickels macht aber die Anwendung des sonst vorzüglichen Kernmaterial bei Kathoden von kleinem Durchmesser, d. h. von auf die Längeneinheit bezogener geringer Oberfläche, uumöglich. Diesem Zwecke entsprechen die mit manchen unedlen Metallen, z. B. Chrom, Mangan oder Titan, gebildeten Legierungen des Nickels, welche hohe Festigkeit haben, viel besser. Dafür besitzen aber die auf eine Chromnickeloberfläche, z.
B. in der früher beschriebenen Weise auf-
EMI1.2
Zersetzung im Vakuum-, nur eine geringe Emission und erlangen ihre volle Emission nur nach einem langandauernden Formierungsprozess, welcher erst nach Fertigstellung der Röhre ausführbar ist. Man hat daher auch vorgeschlagen, einen Kerndraht aus einer Nickellegierung mit einem edlen Metall zu überziehen und auf diesen Überzug die aktive Schichte aufzubringen.
Nach vorliegender Erfindung wird ein Kerndraht aus einer mit unedlem Metall gebildeten Nickellegierung von hoher Festigkeit vor Anbringung der aktiven Schicht mit Nickel, z. B. auf elektrolytischem Wege, überzogen.
PATENT-ANSPRÜCHE :
1. Wehneltkathode mit einem aus mit unedlen Metallen gebildeten Legierung des Nickels bestehenden Kemdraht, gekennzeichnet durch eine darüberliegende dünne Nickelschicht als Träger einer aktiven Schicht.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
Wehnelt cathode and process for making the same.
For Wehnelt cathodes. which by applying suitable compounds of the alkaline earth metals which, when they decompose in vacuo when they are heated, give the active oxides, e.g. B, prepared by applying the carbonates or nitrates of the alkaline earth metals and heating in a vacuum, various core wire materials have been proposed.
EMI1.1
proven. The active material has sufficient immediately after decomposition of the applied compound.
Emission without the cathode having to undergo a long-term heat treatment after its manufacture. the so-called forming would have to be subjected to. The low mechanical strength of the metallic nickel, however, makes the application of the otherwise excellent core material for cathodes of small diameter, i. H. of a small surface in relation to the unit of length, impossible. This purpose corresponds to those with some base metals, e.g. B. chromium, manganese or titanium, formed alloys of nickel, which have high strength, much better. But have on a chrome nickel surface, z.
B. in the manner described earlier
EMI1.2
Decomposition in a vacuum, only a low emission and achieve their full emission only after a long-lasting formation process, which can only be carried out after completion of the tube. It has therefore also been proposed that a core wire made of a nickel alloy be coated with a noble metal and that the active layer be applied to this coating.
According to the present invention, a core wire made of a nickel alloy formed with base metal of high strength is prior to application of the active layer with nickel, e.g. B. electrolytically coated.
PATENT CLAIMS:
1. Wehnelt cathode with a core wire consisting of an alloy of nickel formed with base metals, characterized by an overlying thin nickel layer as a carrier of an active layer.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT131776T | 1931-05-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AT131776B true AT131776B (en) | 1933-02-10 |
Family
ID=3637114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT131776D AT131776B (en) | 1931-05-23 | 1931-05-23 | Wehnelt cathode and process for making the same. |
Country Status (1)
| Country | Link |
|---|---|
| AT (1) | AT131776B (en) |
-
1931
- 1931-05-23 AT AT131776D patent/AT131776B/en active
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