[en] More use is being made of a dissociating coolant for power reactors, nitrogen tetraoxide N₂O₄ with additions of HNO₃, which is highly aggressive. Tungsten carbide and stainless steel are distinguished by high corrosion properties in this medium. Consequently, the most promising is a composite formed by these components. The composite discussed in this study was produced from type PKh18N15 stainless steel (All-Union State Standard (GOST) 13084-67) and tungsten carbide. The VNS composites were produced by powder metallurgy methods. The bend strength of VNS20 and VNS32 composites is determined by the quantity of nu-phase and depends little upon the content of binder (PKh18N15 steel). The composites show high corrosion resistance in a medium of nitrine with additions of nitric acid. Illustrations and tables are included

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[en] Major problems in metallurgical processing include stabilizing the basicity of the agglomerate and improving its quality which requires prompt and reliable monitoring of the calcium oxide and silicon dioxide in the iron-ore charge materials. The authors have devised a nondispersive fluorescence analyzer for iron-ore powder materials that gives the contents of calcium oxide and silicon dioxide. The paper describes the apparatus and various elements in the samples that fluoresce. The authors conclude, based on their data, that this method provides reasonably high accuracy in single determinations as well as constant readings over prolonged periods

[en] The multichannel information-measurement control system of the five-channel stellar spectrophotometer working in photon counting regime is described. The detecting part is synthesized taking into account the principles of multifunctional use of elements of the system. In the part of the photometer scanning mechanism control a discrete drive with the step motor is used. The data are detected on the punched tape, which is convenient for putting them into computer, into a digit printing device with the decimal code or on a diagram tape of the automatic potentiometer

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[en] Tungsten carbide PKh18N15 steel composites are studied for their mechanical and physical properties and structure. It is established that bending strength of the composites is determined by the amount of eta₁-phase and is weakly dependent on the binder content. The hardness, v.v., depends essentially on the eta₁-phase amount and on the binder quantity. Composites display high corrosion resistance in the nitrine medium with additions of nitric acid with a satisfactory level of mechanical and physical properties

[en] A device has been described to measure the electric conductivity, Hall constant, Hall mobility and concentration of charge carriers for thin films of semiconductors and metals in vacuum chamber. A distinctive feature of the device is a possibility to measure electric conductivity and Hall mobility for a definite film thickness and to study the dependence of electric conductivity and Hall mobility on the thickness and temperature without admission of air into the vacuum chamber and influence of heat on the magnetoconductor of an electric magnet. Dependences of Hall mobility of thin films of tellurium on temperature are given which have been obtained using the device described and standard equipment. The developed device excludes influence of the environment on specimens studied and allows data to be obtained which adequately reflect the physics of transport phenomena in thin semiconducting and metallic films

[en] Diffractionless X-ray fluorescence analyzer for detecting calcium oxide and silicon dioxide contents in dry iron ore materials has been developed. The analyzer includes a charging unit, sample-conveying device, spectrometric units for detecting calcium and silicon, computing racks and sample-removing device. Results of calcium oxide and silicon dioxide analyses in iron ore mixtures are presented. Errors are evaluated. It is shown that the analyzer provides high accuracy of one-time determinations, as well as reading constancy for a long time

No abstract available