SU857733A1

SU857733A1 - Constant spectral electrode

Info

Publication number: SU857733A1
Application number: SU782611004A
Authority: SU
Inventors: Майя Никифоровна Кондакова; Дмитрий Гаврилович Никитин; Алла Алексеевна Коваленко
Original assignee: Предприятие П/Я Р-6273
Priority date: 1978-04-21
Filing date: 1978-04-21
Publication date: 1981-08-23

Description

(54) ПОСТОЯННЫЙ СПЕКТРАЛЬНЫЙ ЭЛЕКТРОД(54) CONSTANT SPECTRAL ELECTRODE

1one

Изобретение относитс к области спектрального анализа, а именно к конструкции посто нного спектрального электрода, и может быть использовано при спектральном анализе сталей неметаллических материалов и т.д.The invention relates to the field of spectral analysis, in particular to the design of a constant spectral electrode, and can be used in the spectral analysis of steels of non-metallic materials, etc.

Известен посто нный спектральный электрод, состо щий из электропровод щей основы и примыкающей к ней стержневой рабочей части, Такие электроды представл ют собой стержень из электропровод щего материала (графита , меди, железа, никел , магни и т.д.), который в рабочей части заточен на цилиндр Ц. A permanent spectral electrode is known, consisting of an electrically conductive base and an adjacent core working part. Such electrodes are a rod of electrically conducting material (graphite, copper, iron, nickel, magnesium, etc.), which is parts sharpened to cylinder C.

Недостатком известных электродов вл етс то, что они пригодны только дл определени сравнительно больших концентраций элементов в пробе. Причина этого заключаетс в том,что известные электроды обеспечивают обыскривание анализируемой пробы только в одной точке поверхности, т.е. дают при анализе только один искровой разр д, интенсивность которого не может быть больше предельной величины, определ емой заданной мощностью генератора искры. Это приводит к тому, что спектральные линии примесей получаютс слабыми, неконцентрационночувствительными . Не дает эффекта и увеличение мощности генератора , поскольку при этом имеет место неравномерное поступление вещества в плазму разр да, и, как следствие, снижение точности анализа,A disadvantage of the known electrodes is that they are only suitable for determining relatively high concentrations of elements in the sample. The reason for this is that the known electrodes ensure that the analyzed sample is searched only at one point on the surface, i.e. give the analysis only one spark, the intensity of which can not be greater than the limiting value determined by the given power of the spark generator. This leads to the fact that the spectral lines of impurities are weak, non-concentration-sensitive. There is no effect and an increase in generator power, since this causes an uneven intake of a substance into the discharge plasma, and, as a result, a decrease in the accuracy of the analysis,

Цель изобретени - повышение точности определени малых концентраций анализируемых элементов.The purpose of the invention is to improve the accuracy of determining small concentrations of the elements being analyzed.

10ten

Указанна цель достигаетс тем, что рабоча часть электрода выполнена по крайней мере из двух стержней, рассто ние между которыми составл ет от 3 до 5 их диаметров.This goal is achieved by the fact that the working part of the electrode is made of at least two rods, the distance between which is from 3 to 5 of their diameters.

1515

Кроме того,, рабоча часть электрода выполнена из трех стержней,проекции которых на основу лежат в вершинах равностороннего треугольника.In addition, the working part of the electrode is made of three rods, whose projections onto the base lie at the vertices of an equilateral triangle.

На фиг. 1 изображен посто нный FIG. 1 depicts a constant

20 спектральный электрод, общий вид; на фиг. 2 - вид А на фиг. 1; на фиг. 3 - составной электрод; на фиг. 4 - разрез А-А на фиг. 3.20 spectral electrode, general view; in fig. 2 is a view A of FIG. one; in fig. 3 - composite electrode; in fig. 4 shows section A-A in FIG. 3

Посто нный спектральный электрод Constant spectral electrode

25 ( фиг. 1,2) состоит из электропровод щей основы 1, например медной, уто.пщени 2 и рабочей части, выполненной в виде трех стержней 3, изготовленных из металла, обладающего . 30 большим сродством к кислороду, например магни . Стержни 3 расположены парашлельно электропровод щей основе 1 и выступают от места соединени с нею на 10-15 мм. Составной электрод (фиг. 3,4) содержит электропровод щую основу 4, а его рабоча часть выполнена в виде стержней 5, закрепленных на основе при помощи держател 6 винтами 7.25 (Fig. 1, 2) consists of an electrically conductive base 1, for example copper, a wedge 2 and a working part made in the form of three rods 3 made of a metal having. 30 greater affinity for oxygen, such as magnesium. The rods 3 are arranged parallel to the electrically conductive base 1 and protrude 10-15 mm from the junction with it. The composite electrode (Fig. 3.4) contains an electrically conductive base 4, and its working part is made in the form of rods 5 fixed on the base by means of a holder 6 with screws 7.

Claims

When such an electrode is used, several spark discharges occur, while the excitation of the radiation involves a much larger surface of the sample being analyzed, the intensity of the radiation increases and the intensity of the spectral lines of the elements increases with a low concentration in the sample. their diameters to obtain maximum illumination; 180 The use of a constant spectral electrode of the proposed design leads to a violation of the accuracy of the spec moral analysis. The use of a constant spectral electrode will expand the possibilities of spectral analysis in industry and will ensure the control of impurities in finished products. Formula 1: A constant spectral electro consisting of an electrically conductive base and an adjacent core working part, characterized in that sharpened the spectrograph and not less than 3 diameters due to the fact that the spot of the search must be in close proximity, but not overlap each other.

Example. In order to carry out a spectral analysis with the proposed electrode, a sample of a metal weighing at least 30 g, which served as the lower electrode, was taken. The top (constant) electrode was a composite electrode. The standards were selected and repeatedly analyzed samples of the Ural Institute of Ferrous Metals.

The results of the determination of carbon in steels by the spectral method using the known and proposed electrodes under the same conditions of analysis are shown in the table.

satisfactory

0.047

0.234

0.038

0.170 for determining the low concentrations of the elements being analyzed, the working part of the electrode is made of at least two rods, the distance between which is from 3 to 5 of their diameters.

2. Electrode according to claim 1, TL, which is based on the fact that the working part is made of three rods, the projections of which on the island lie at the vertices of the equilateral triangle. Sources of information taken into account in the examination I. Mandelstam S.A. Introduction to spectral analysis. M., Gostekhizdat, 1946, p. 84-85, fig. 66

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