DE499847C - Process for the production of hydrides of the alkali and alkaline earth metals for glow cathodes - Google Patents

Process for the production of hydrides of the alkali and alkaline earth metals for glow cathodes

Info

Publication number
DE499847C
DE499847C DER68032D DER0068032D DE499847C DE 499847 C DE499847 C DE 499847C DE R68032 D DER68032 D DE R68032D DE R0068032 D DER0068032 D DE R0068032D DE 499847 C DE499847 C DE 499847C
Authority
DE
Germany
Prior art keywords
alkaline earth
hydrides
alkali
earth metals
production
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DER68032D
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German (de)
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Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DER68032D priority Critical patent/DE499847C/en
Application granted granted Critical
Publication of DE499847C publication Critical patent/DE499847C/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/042—Manufacture, activation of the emissive part

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Description

Verfahren zur Herstellung von Hydriden der Alkali- und Erdalkallmetalle für Glühkathoden Es ist bekannt, daß sich Erdalkalihydride unter Einwirkung von Wasserstoff aus den Oxyden der Erdalkalien bei erhöhten Temperaturen bilden. Da die Reaktion zwischen dem Erdalkalimetall und dem Wasserstoff verhältnismäßig träge verläuft, hat man zur Erleichterung der Darstellung der Hydride den in einer Wasserstoffatmosphäre zu erhitzenden Erdalkalioxyden Magnesium zugesetzt.Process for the production of hydrides of alkali and alkaline earth metals for hot cathodes It is known that alkaline earth hydrides under the action of Form hydrogen from the oxides of the alkaline earths at elevated temperatures. There the reaction between the alkaline earth metal and the hydrogen is relatively sluggish runs, one has to facilitate the representation of the hydrides in a hydrogen atmosphere Magnesium added to the alkaline earth oxides to be heated.

Erfindungsgemäß wird dieses Verfahren für Glühkathoden, da es auf die spezifische Elektronenemüssion günstig einwirkt, angewendet. Die Alkali- oder Erdalkaliverbindung - außer den Oxyden sind auch andere Verbindungen verwendbar - wird mit einer Dosis einer solchen Substanz zusammengebracht, die eine sehr hohe, möglichst eine noch höhere Affinität zum Sauerstoff hat als das ursprünglich mit dem Sauerstoff verbundene Metall.According to the invention, this method for hot cathodes, since it is based on the specific electron emission acts favorably, applied. The alkali or Alkaline earth compound - in addition to the oxides, other compounds can also be used - is brought into contact with a dose of such a substance that has a very high, if possible, has an even higher affinity for oxygen than originally with metal associated with oxygen.

Hierzu eignen sich beispielsweise Aluminium und Magnesium. Diese Metalle sind aus dem Grunde besonders giinstig, weil sie die Elektronenemission nicht behindern.Aluminum and magnesium, for example, are suitable for this. These metals are particularly favorable for the reason that they do not hinder electron emission.

Die Anwesenheit der Hydride ist besonders auf der Oberfläche der Kathode erforderlich, da die spezifische Elektronenemission eine Eigenschaft der Oberfläche ist.The presence of the hydrides is particularly evident on the surface of the cathode required because the specific electron emission is a property of the surface is.

Der sauerstoffaffine Zusatz wirkt wahrscheinlich auf die ursprüngliche Verbindung derart, daß er die Lostrennung des Sauerstoffes begünstigt und damit den Platz für den Eintritt des Wasserstoffes in die Molekularverbindung frei macht.The additive with an affinity for oxygen probably affects the original one Connection in such a way that it favors the separation of the oxygen and thus clears the space for the hydrogen to enter the molecular compound.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von Hydriden der Alkali- und Erdalkalimetalle für Glühkathoden, dadurch gekennzeichnet, daß Oxyde der Alkali- oder Erdalkalimetalle unter Zumischung von stark sauerstoffaffinen Substanzen., z. B. Magnesium oder Aluminium, in Gegenwart von Wasserstoff erhitzt werden.PATENT CLAIM: Process for the production of hydrides of the alkali and alkaline earth metals for hot cathodes, characterized in that oxides of the alkali or alkaline earth metals with the addition of substances with strong oxygen affinity., z. B. magnesium or aluminum, are heated in the presence of hydrogen.
DER68032D 1926-06-29 1926-06-29 Process for the production of hydrides of the alkali and alkaline earth metals for glow cathodes Expired DE499847C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DER68032D DE499847C (en) 1926-06-29 1926-06-29 Process for the production of hydrides of the alkali and alkaline earth metals for glow cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER68032D DE499847C (en) 1926-06-29 1926-06-29 Process for the production of hydrides of the alkali and alkaline earth metals for glow cathodes

Publications (1)

Publication Number Publication Date
DE499847C true DE499847C (en) 1930-06-17

Family

ID=7413283

Family Applications (1)

Application Number Title Priority Date Filing Date
DER68032D Expired DE499847C (en) 1926-06-29 1926-06-29 Process for the production of hydrides of the alkali and alkaline earth metals for glow cathodes

Country Status (1)

Country Link
DE (1) DE499847C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1241421B (en) * 1963-11-26 1967-06-01 Bayer Ag Process for the production of sodium boranate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1241421B (en) * 1963-11-26 1967-06-01 Bayer Ag Process for the production of sodium boranate

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