Vol. 15, No. 6 (1959)
1959, 15 (6): 277-281. doi: 10.7498/aps.15.277
In accordance with the development of our national steel industry, we try to construct a spectroscope for the visual analysis of the compositions of steel or the other alloys. The work is completed in a course of 2 1/2 month. The whole apparatus consists of an auto-collimating spectroscope, a special desgined holder for specimens, and a high frequency activated alternating current are source. The model is somewhat like that produced by the firm of Fuess, but the whole optical systems are designed and computed according to the theory of optical abbora-tions. The auto-collimating objective is made achromatic, and the eyepiece is of Kolner type with magnification of 25X. With one and half prisms, each with 3 cm base, the spectroscope disperses the spectrum from 3900? to 7000?. The li-near dispersions of the final image of the system, at λ = 4358? and λ= 5893? are 0.89?/mm and 2.91?/mm, respectively. The resolving power △λ of the spectroscope at those wave lengths is 0.14? and 0.59?, respectively. The cireuit dia-gram of the arc source is also given.
1959, 15 (6): 285-296. doi: 10.7498/aps.15.285
wideThe application of spectro-chemical analysis to high alloy steel in our steel works has been limited by the accuracy of their methods. Through the investigation upon two typical high alloy steels, ‘P18' high speed steel and ‘Я1' stainless steel, it is proved that the minimum standard deviation that can Le reached by the photographic method of epectro-chemical analysis of such high alloy steels after adopting many improvements in each step of the analysis is about 1%. Many valuable experiences from our steel factories are introduced in this paper, and the problems concerning accuracy of the spectro-chemical analysis of high alloy steels are discussed.
In this article, it briefly introduces that by means of the three electro time-relays to control the arc-burn period, the pre-burn period and the moving distance of the photographic box, it simplifies the procedure of the work, shortens the required time and greatly raises the efficiency of the work concerned.
PHOTO-ELECTRIC DIRECT-READING ATTACHMENT TO A MEDIUM QUARTZ SPECTROGRAPH AND ANALYSIS OF COPPER IN Al-ALLOY
1959, 15 (6): 318-324. doi: 10.7498/aps.15.318
Two movable photo-multiplier tubes are set in the position of the plate holder of a medium quartz spectrograph. The photo-current of each is amplified by an AC amplifier, and, after rectification, is used to charge a condenser. A thyratron is connected parallel to the condenser for the internal standard line (Al 2660?). At a present value of the voltage of this condenser, the thyratron operates so as to switch off the reading instrument which is connected with the other condenser for the analysis line (Cu 2247?). The final reading on the meter is proved to be proportional to the ratio of intensities of the two spectral lines.With the help of a set of standard samples, calibration curve for analysis of copper in Al-alloy is obtained. It is a straight lino in the concentration interval 2.3-6.7%. Beproducibility of the whole instrument including the light source is measured by repeating ten times the calibration process, each time determining the content of Cu in a given sample. The mean relative error of those ten determinations is 4%. The results of spectroscopic determination and chemical analysis have a deviation of 1%.
1959, 15 (6): 325-330. doi: 10.7498/aps.15.325
A quantitative spectral method is usod to determino the various impurities contained in the 99.99% pure antimony. The antimony metal is ground to powder form as sample. A cortain amount of chemical salt, one of its component is the impurity element to be determined, in the form of powder is added to the sample, to secure a series of standards by several times of dilution. All the samples and standards are placed in the respective craters drilled on carbon rods. Each sample is photographed for five times by a Zeiss Qu-24 medium size quartz spec-trograph in same spectral plate. The result is obtained by linear interpolation method. The interrupted arc with longest interrupted time and exposure time is found to be a suitable source.Several impurities, including Ca, Si, Mg, Cu Fe, Al and Pb are analysed successfully at sensitivities from 10-5 to 10-6. The experimental error is only estimated about 30-
1959, 15 (6): 337-340. doi: 10.7498/aps.15.337
Group analysis of hydrocarbon compounds by integral intensities of infrared spectra was obtained. The results of determination of the number of atomic groups CH2 and CH3 were quite good. It seems justifiable that this method could be used to analyse other types of structural groups.