Limit of inert functional admixtures depending on the dispersion in the combustion synthesis of nickel aluminides. (November 2018)

• Record Type: Journal Article
• Authors: Gulyaev, P; Dolmatov, A; Jordan, V; Panchenko, Y
• Is Part Of: Journal of physics. Volume 1134(2018)
• Publication Date: 2018-11
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1134/1/012018
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: The aim of this study is to report is to report a new experimental possibility of determining the thermal stability limit in the combustion synthesis of nickel aluminides, when the reaction mixture is diluted with inert additives. The paper presents the results of measuring the temperature and velocity in the propagation of a combustion wave, obtained using a special television micro-pyrometer (1200 x 800 pixels) with high spatial (5.85 μm / pixel) and resolution time (1000 fps). High accuracy of temperature measurement was provided by using a new method of spectrally-bright pyrometry from 800 to 2000 °C with an error of less than 1%. This paper shows the experimental procedure and statistical data on the hysteretic dependence of velocity on temperature. Experimental results are given of the measurement of the dependence of the velocity and temperature of the combustion wave in the Ni-Al system for different proportions of inert additives in the range from 2.5 to 30% with a change in the dispersion from 80 to 220 μm. It is shown that for a small size of an inert additive, the thermal stability of the combustion wave is lost faster, and the limit of the inert addition decreases from 22.5 to 17.5%.