The features of combustion and structure formation of ceramic materials in the Cr–Al–Si–B system

The features of combustion and structure formation of ceramic materials in the TiC–Ti3PO –CaO system

“…The combustion temperature (T c ) and rate (U c ) were measured for the mixtures with X¼ 20 and 30 wt% in a laboratory SHS rector on cylindrical-shaped briquettes (10 mm in diameter, 15 mm high) with a relative density of 60% using the procedure described in [16,17]. T c was measured using a W-Re thermocouple; the thermocouple was mounted in a hole $ 4-mm deep and 2 mm in diameter that was drilled into the sample.…”

“…An LKD-41 one-coordinate position-sensitive detector was used for the single-frame recording of XRD patterns [16][17][18]. The diffraction pattern was recorded in the 2θ angle range of 28 to 641 because the initial reagents, probable intermediates and final products of the reaction have an intense diffraction maxima in this range.…”

“…The dynamics of structural transformation in the combustion wave were studied using the well-known method of stopped combustion front (SCF) by quenching in a copper wedge (the vertex angle of 51) [16,17,19] followed by the scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) of the characteristic SCF areas using a Hitachi S-3400N scanning electron microscope equipped with a NORAN energy-dispersive X-ray spectrometer. For the SEM investigations, a cross-section of the SCF sample was prepared using conductive resin.…”

“…The technological parameters of the force SHS-pressing technology [16,17,20] (pressing delay time after combustion was finished, exposure time of hot synthesis products under pressure, and molding pressure) providing the minimal residual porosity were optimized for each composition to produce dense ceramic samples. Table 1 shows the experimental T c and U c values at different initial temperatures (T 0 ) of the SHS process.…”