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Cathode material of hollow-cathode lamp and preparation method thereof

A hollow cathode lamp and cathode material technology, which is applied to the parts and components of gas discharge lamps, can solve the problems of low melting point, easy sublimation, and low energy, and achieve the effect of overcoming mutual interference and improving energy.

Inactive Publication Date: 2010-07-07
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as Se, As, Te, Bi, B, Ge, Si, etc. These hollow cathode lamps have one thing in common, that is, low energy and short life, especially the improvement of the sensitivity of atomic fluorescence analysis instruments depends largely on the light source part In order to pursue the sensitivity of the instrument, some manufacturers are very picky about the hollow cathode lamp, and the simple substances of these elements are also volatile, easy to sublimate, and have a relatively low melting point. They cannot be used with high current. To obtain high energy, they can only increase the current. , so most of the element cathodes must use alloy elements, such as Se element is Se-Sn alloy at first, but there is interference in the atomic fluorescence analysis, so the research on other alloy elements of selenium must not only have strong atomic fluorescence, but also be stable , long life, no interference

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  • Cathode material of hollow-cathode lamp and preparation method thereof

Examples

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Effect test

Embodiment 1

[0018] A cathode material for a hollow cathode lamp, the cathode material is composed of AgSe alloy, the percentage content of Se in the AgSe alloy is 55%, and the percentage content of Ag is 45%.

[0019] A method for preparing a cathode material of a hollow cathode lamp, the method steps are as follows,

[0020] (1) Take metallic silver and metallic selenium (metallic silver and metallic selenium are block, and purity is all greater than 99.99%), mix by above-mentioned ratio;

[0021] (2) Put the mixture into the quartz crucible, put the crucible into the melting equipment, and evacuate until the vacuum degree is less than 10 -3 Pa;

[0022] (3) Heating the mixture to 1300° C., melting the raw materials, stirring, melting for 60 minutes, and cooling with the furnace to obtain the AgSe alloy.

[0023] The hollow cathode lamp that prepared cathode material is made is used in atomic absorption spectrometer G660, test condition slit 0.2nm, wavelength 1960.0nm, with old lamp (c...

Embodiment 2

[0025] A cathode material for a hollow cathode lamp, the cathode material is composed of AgSe alloy, the percentage content of Se in the AgSe alloy is 65%, and the percentage content of Ag is 35%.

[0026] A method for preparing a cathode material of a hollow cathode lamp, the method steps are as follows,

[0027] (1) Take metallic silver and metallic selenium (metallic silver and metallic selenium are powders, and the purity is greater than 99.99%) and mix according to the above ratio;

[0028] (2) Put the mixture into the quartz crucible, put the crucible into the melting equipment, and evacuate until the vacuum degree is less than 10 -3 Pa;

[0029] (3) Heating the mixture to 1200° C., melting the raw materials, stirring, melting for 120 minutes, and cooling with the furnace to obtain the AgSe alloy.

[0030] The hollow cathode lamp that prepared cathode material is made is used in atomic absorption spectrometer G660, test condition slit 0.2nm, wavelength 1960.0nm, with o...

Embodiment 3

[0032] A cathode material for a hollow cathode lamp, the cathode material is composed of AgSe alloy, the percentage content of Se in the AgSe alloy is 70%, and the percentage content of Ag is 30%.

[0033] A method for preparing a cathode material of a hollow cathode lamp, the method steps are as follows,

[0034] (1) Take metallic silver and metallic selenium (metallic silver and metallic selenium are powders, and the purity is greater than 99.99%) according to the above ratio, and mix;

[0035] (2) Put the mixture into the quartz crucible, put the crucible into the melting equipment, and evacuate until the vacuum degree is less than 10 -3 Pa;

[0036] (3) Heating the mixture to 1400° C., melting the raw materials, stirring, melting for 240 minutes, and cooling with the furnace to obtain the AgSe alloy.

[0037] The hollow cathode lamp that prepared cathode material is made is used in atomic absorption spectrometer G660, test condition slit 0.2nm, wavelength 1960.0nm, with ...

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Abstract

The invention provides a cathode material of a hollow-cathode lamp and a preparation method thereof, belonging to the technical field of analyzing and testing devices. The cathode material is prepared from the component of AgSe alloy, wherein the percentage composition of Se in the AgSe alloy is 10-80%, and the percentage composition of Ag is 20-90%. The preparation method comprises the following steps: weighting Ag and Se based on the proportion and mixing; putting the mixed materials into a smelting device, and vacuumizing to the vacuum degree less than 10-3Pa; and heating the mixed materials, heating up to 600-1400 DEG C until the materials are melt, stirring, and cooling in the furnace to obtain the AgSe alloy, wherein the smelting time is 10-240 minutes. The energy of the hollow-cathode selenium lamp is increased by more than 60%, the drift of the stability is less than 1% (within half an hour), and the mutual interference of Se-Sn / Se-Pb alloy elements in atomic fluorescence analysis is overcome.

Description

technical field [0001] The invention belongs to the technical field of analysis and testing instruments, and in particular relates to a cathode material of a hollow cathode lamp and a preparation method thereof. Background technique [0002] Hollow cathode lamps are used for atomic absorption spectrometry, atomic fluorescence spectrometry, molecular absorption spectrometry and other sharp line light sources in instruments that require line spectrum light sources and reference wavelengths. [0003] Cathode selection and cathode (smelting) shaping for high performance hollow cathode lamps with transition elements. Such as Se, As, Te, Bi, B, Ge, Si, etc. These hollow cathode lamps have one thing in common, that is, low energy and short life, especially the improvement of the sensitivity of atomic fluorescence analysis instruments depends largely on the light source part In order to pursue the sensitivity of the instrument, some manufacturers are very picky about the hollow cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/09C22C5/06C22C1/02
Inventor 李中建张敏郭长礼郭增华张宁马贺英
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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