25 Result(s)

Article

Aero-abrasive wear resistance of zirconium carbide base cermets

1. A study was made of the intensity of wear of ZrC-Nb, ZrC-Mo, and ZrC-W cermets with metal-to-carbide ratios o...

G. V. Samsonov, A. A. Dan'kin, I. V. Bogomol… in Soviet Powder Metallurgy and Metal Ceramics (1973)

Article

Strength and gas-abrasive wear resistance of cermets based on zirconium carbide

1. The strength and wear resistance of cermets based on zirconium carbide are determined by the conditions under...

G. V. Samsonov, A. A. Dan'kin, A. A. Markov… in Soviet Powder Metallurgy and Metal Ceramics (1976)

Article

Ultrasonic Multichannel Flaw Detector for Testing Rails with Signal Recording

Although automated testing instruments have been introduced intensely on the railways of Russia, up to 95% of hazardous flaws in rails are detected by ultrasonic two-line (removable) flaw detectors. The paper ...

A. A. Markov, D. A. Shpagin, M. N. Shilov in Russian Journal of Nondestructive Testing (2003)

Article

A program for 3D simulation of signals for ultrasonic testing of specimens

Optimization of the parameters of schemes using multichannel ultrasonic flaw detectors for sonic testing of rails (sonic test schemes), as well as development of algorithms for processing test signals, are con...

A. A. Markov, V. V. Mosyagin, M. V. Keskinov in Russian Journal of Nondestructive Testing (2005)

Article

Oxygen transport and thermomechanical properties of SrFe(Al)O_3-δ –SrAl₂O₄ composites: microstructural effects

Measurements of oxygen permeation through dense % MathType!Translator!2!1!AMS LaTeX.tdl!TeX -- AMS-LaTeX! % MathType!MTEF!2!1!+- % feaaeaart1ev0aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX % garmW...

V. V. Kharton, A. V. Kovalevsky… in Journal of Solid State Electrochemistry (2006)

Article

Oxygen permeability, stability and electrochemical behavior of \( \Pr _{2} {\text{NiO}}_{{4 + \delta }} \) -based materials

The high-temperature electronic and ionic transport properties, thermal expansion and stability of dense $$ \Pr _{2} {\text{NiO}}_{{4 ...

A. V. Kovalevsky, V. V. Kharton, A. A. Yaremchenko… in Journal of Electroceramics (2007)

Article

Detection of flaws in the railhead by the mirror method under the condition of multiple reflection of ultrasonic oscillations

Issues of detection of flaws in the railhead by the echo and mirror methods are considered. The influence of the degree of rail wear on the path of propagating ultrasonic beams has been studied. It has been sh...

A. A. Markov, M. V. Keskinov in Russian Journal of Nondestructive Testing (2008)

Article

Evaluation of transverse cracks detection depth in MFL rail NDT

The limiting detection depth of subsurface defects is considered as an important efficiency factor of Magnetic Flux Leakage (MFL) method of railway nondestructive testing. This issue is particularly topical si...

A. G. Antipov, A. A. Markov in Russian Journal of Nondestructive Testing (2014)

Article

Ion transport in dual-phase SrFe_1−xТа_xO_3−δ (x = 0.03 − 0.10): effects of redox cycling

The incorporation of tantalum cations in mixed-conducting SrFe_1-xTa_xO_3−δ (x = 0.03 − 0.10) results in the formation of single cubic perovskite-like phases in oxidizing atmospheres while under red...

E. V. Shalaeva, M. V. Patrakeev, A. A. Markov… in Journal of Solid State Electrochemistry (2015)

Article

Oxygen non-stoichiometry and mixed conductivity of La_0.5Sr_0.5Fe_1–x Mn _x O_3–δ

Oxygen non-stoichiometry, thermal expansion, and high-temperature transport properties of perovskite-type La_0.5Sr_0.5Fe_{1– x} Mn _{x ...}

A. A. Markov, K. Yu. Chesnokov, M. V. Patrakeev… in Journal of Solid State Electrochemistry (2016)

Article

A comparative analysis of the active and residual magnetization methods in the nondestructive testing of rails

The comparison of residual Magnetic Flux Leakage (MFL) with traditional MFL method was carried out as applied to rail nondestructive testing. The mechanisms for the residual magnetization of rails are consider...

A. G. Antipov, A. A. Markov in Russian Journal of Nondestructive Testing (2016)

Article

Evaluation of the Size and Type of Flaws in a Railhead

The relevance of being able to detect flaws beneath horizontal exfoliations in rails with simultaneous measurement of crack parameters has been shown. Based on the performed research, the authors proposed a ne...

A. A. Markov, V. V. Mosyagin in Russian Journal of Nondestructive Testing (2018)

Article

The impact of Ba substitution on high-temperature transport in lanthanum-strontium ferrite

Effect of barium content on structural, thermal, and transport properties of oxides La_0.49Sr_0.5–x Ba _x FeO_3–δ (х = 0, 0.25, 0.50) was studied wit...

A. D. Bamburov, A. A. Markov, I. A. Leonidov… in Journal of Solid State Electrochemistry (2018)

Article

Defect formation, ordering, and transport in SrFe_1–x Si _x O_3–δ (x = 0.05–0.20)

Oxygen nonstoichiometry of perovskite-like SrFe_1–x Si _x O_3–δ (x = 0.05–0.20), studied by thermogravimetric analysis and coulometric titration in ...

O. V. Merkulov, E. N. Naumovich, M. V. Patrakeev… in Journal of Solid State Electrochemistry (2018)

Article

Fabrication and Testing of a Tubular Thermoelectric Module Based on Oxide Elements

A thermoelectric module with a tubular design, considered as particularly promising for energy recovery from hot exhaust gases of vehicles was fabricated and successfully tested under laboratory condition. The...

O. V. Merkulov, B. V. Politov, K. Yu. Chesnokov… in Journal of Electronic Materials (2018)

Article

Detectability of Rail Defects by Magnetic Flux Leakage Method

The ability of the Magnetic Flux Leakage (MFL) method to detect flaws in railway rails in two different ways has been studied. First, a three-dimensional computer simulation of the leakage of magnetic flux aro...

A. G. Antipov, A. A. Markov in Russian Journal of Nondestructive Testing (2019)

Article

High-temperature transport in perovskite-type Ca_0.25Sr_0.75Fe_0.75Mo_0.25O_{3 − δ}

The comparative study of transport characteristics of SrFe_0.75Mo_0.25O_{3 − δ} and Ca_0.25Sr_0.75Fe_0.75Mo_0.25O_{3 − δ} was carried out in order to evaluate calcium substitution usability to improve functional properties o...

O. V. Merkulov, A. A. Markov, I. A. Leonidov… in Journal of Solid State Electrochemistry (2019)

Article

Analyzing the Development of Rail Defects Based on Results of Multichannel Periodic Testing

Systems for nondestructive testing (NDT) of rails are multichannel and concurrently use several methods, including ultrasonic, magnetic flux leakage (MFL), visual, and others. Periodic inspection of rails does...

A. A. Markov, E. A. Maksimova, A. G. Antipov in Russian Journal of Nondestructive Testing (2019)

Article

Analyzing Ultrasonic Signal Parameters during High-Speed Rail Inspection

The results of investigating the parameters of ultrasonic signals when increasing rail testing speed presented. Signals from rail bolt holes were selected as test reflectors. It is shown that the holes closest...

A. A. Markov, E. A. Maximova in Russian Journal of Nondestructive Testing (2021)

Article

Analysis of the Parameters of Bottom Signals in the Area of Welded Joints of Rails under High-Speed Ultrasonic Testing

This research is a continuation of the work aimed at analyzing the parameters of ultrasonic signals during high-speed rail inspection. The analysis of the behavior of the amplitudes of the sequences of bottom ...

A. A. Markov, E. A. Maksimova in Russian Journal of Nondestructive Testing (2021)