SU1458908A1 - Suspension for applying gas absorber for incandescent lamps - Google Patents

Abstract

The invention is responsible for electrical engineering and can be used in the manufacture of incandescent lamps. The aim of the invention is to increase the mechanical strength of the filament bodies. Potassium chlorate is used as the last suspension for applying a getter containing the active substance, an organic compound, a solvent and an inorganic oxygen-containing substance. In the process of welding lamps, the internal elements of the incandescent lamp are heated. Chlorate Kyl is decomposed with the release of oxygen, which actively oxidizes carbon to the organic component. In the future, when the spirals of the lamps are fired, potassium diffuses into the thickness of the tungsten wire from the surface of the incandescent body, increases its plasticity and forms a structure that has high resistance to mechanical loads. 3 tab. with ( /)

Description

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The invention relates to electrical engineering and can be used in the manufacture of incandescent lamps.

The aim of the invention is to increase the mechanical strength of the filament bodies of incandescent lamps.

In order to obtain a suspension intended for the introduction of the getter into the incandescent lamp, three groups of ingredients were prepared, each containing by weight:

first group of mixtures of ingredients: glue BF-2 (organic compound) 5; potassium chlorate 13; differing from each other in the content of hafnium nitride (active substance) 10, 25, 40, as well as the content of ethyl alcohol, an additional part up to 100% in each mixture;

the second group of mixtures of ingredients: zirconium diboride (active substance) 20; potassium chlorate 13; differing from each other in the content of BP-2 (organic compound) 2, 6, 10,. and also the content of ethyl alcohol, which constitutes an additional 100% of each mixture;

one third group of mixtures of ingredients: red phosphorus (active substance) 10; colloxylin (organic compound) 5; differing from each other in potassium chlorate 5, 13, 20, as well as in acetone, which constitutes an additional 100% of each mixture.

The results of the test suspensions are given in table. 1-3.

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From tab. 1, it can be seen that the optimal amount of hafnium nitride in a suspension containing a balanced amount of HF-2 and calsh chlorate is in the range of 10-40 wt.%. Going beyond these limits leads to a decrease in the dynamic durability of the lamps, due to the absence of the reinforcing effect of tungsten nitride. With a limit of 40% by weight of hafnium nitride, lamps are observed to fail as a result of an arc, due to an increase in the emission ability of the helix surface.

From tab. 2 that the optimum amount of organic compound (LP-2); in the suspension consisting of zirconium dibsride and potassium chlorate is in the range of 2-10% by weight. When less than 2% is introduced into the organic matter suspension, the adhesive ability of the getter particles is significantly reduced, its absorption from the surface of the heat body is observed. With the introduction of more than 10 wt.% Of an organic component in the suspension, an embrittling effect of carbon of the organic component on tungsten and a decrease in the mechanical strength of the filament body are observed.

As can be seen from the table. 3, the optimal addition of potassium hlrrate is in the range of 5-20% by weight of the total ingredients included in the suspension. Introduction to the suspension of potassium chlorate in an amount of less than 5 wt. leads to incomplete burning of carbon on the surface of the helix. In the event that the content of potassium chlorate exceeds 20 wt.%, There is a decrease in the reliability of the lamps due to an excess

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In the process of welding lamps is heating the internal structural elements. The potassium chlorate applied with the active substance and the organic compound begins to decompose with the release of oxygen, which is actively oxidizing the carbon in the organic component. Removal of volatile carbon compounds is carried out in subsequent operations of pumping and flushing the internal volume of the flask with nitrogen. Subsequently, during the firing of the spirals of lamps at the operation ... of the pinout, potassium from the surface of the incandescent body diffuses into the thickness of the tungsten wire, increases its plasticity and forms a structure with increased resistance to mechanical loads.

Claims (1)

Invention Formula Slurry dp of deposition of a getter for incandescent bulbs, containing the active substance, organic compound, inorganic oxygen-containing substance; the latter is a compound with a decomposition temperature not exceeding 400 ° C and a solvent, in the following ratios of components, wt.%: Active substance 10-40 Organic compound 2-10 Inorganic acid. Hydrogen-containing compound. Solvent characterized by 5-20 The rest is that. in order to increase the mechanical strength of the incandescent body, potassium chlorate was taken as the inorganic oxygen-containing compound. Table 1 10 25 40 9 h 40 min 14 h 30 min 11 h 05 min The composition of the suspension: BF-25 Potassium chlorate 13 Ethyl alcohol to 100% The content of BF-2, g, in suspension 2 6 ten Suspension composition: Zirconium diboride; Potassium chlorate; Ethyl alcohol Content of potassium, g, in suspension five 13 20 The composition of the suspension: - Red phosphorus Kolloksilin Acetone Continued table. one table 2 The time during which 50% of the lamps died when tested on dynamic durability, h 10 h 10 min 13 h 50 min 8 h 50 min 20 13 yes 100% Table 3 Time during which over 50% of the lamps failed during dynamic durability tests, h 8 10 min 12 h 20 min 10 h 05 min ten 5 others. 100%