Author(s): Jandieri G.^*, Sakhvadze D.

Affiliation(s): Rafiel Dvali Institute of Machine Mechanics, 10, Elizbar Mindeli St., 0186, Tbilisi, Georgia

^*Corresponding Author’s Address: [email protected]

Issue: Volume 11, Issue 2 (2024)

Dates:
Submitted: June 15, 2024
Received in revised form: September 11, 2024
Accepted for publication: September 24, 2024
Available online: September 28, 2024

Citation:
Jandieri G., Sakhvadze D. (2024). Controlled synthesis of TiB₂-TiC composite: Substantiation of the homogenizing Joule thermostatting efficiency and improvement of SHS-compaction technology in a vacuum. Journal of Engineering Sciences (Ukraine), Vol. 11(2), pp. C13–C28. https://doi.org/10.21272/jes.2024.11(2).c2

DOI: 10.21272/jes.2024.11(2).c2

Research Area: Materials Science

Abstract. This research aims to improve and substantiate the efficiency of homogenization heat-stabilizing Joule heating on ceramic-matrix composites of TiB₂-TiC system with a 2:1 component ratio during its synthesis. For this purpose, an improved technological approach is proposed, which is based on the known method of SHS-compacting but differs by the possibility of controlled Joule influence on the synthesis products, which is achieved by the use of a special electrothermal vacuum press-mold functioning according to a particular control algorithm. The task of controlled Joule heating is a compensation of the temperature gradient formed in the synthesized workpiece, which is solved by passing in it a direct current directed in line with the vector of propagation of the combustion wave. An indicator of assessment of the degree of compensation of the noted temperature gradient is the Seebeck effect, excited between the upper and lower surface of the SHS workpiece, which should be brought to zero in the process of Joule thermostatting. It was experimentally revealed that compensation of the noted temperature gradient with heat released predominantly by electrically conductive and Joule-heated TiC grains leads to their softening, which contributes to more uniform compaction of the workpiece due to diffusion coalescence of these grains around prism-shaped hard TiB₂ crystals. Such consolidation leads to a significant increase in the quality of structural packaging and a reduction in the number and volume of micropores, as a result of which the performance properties of the composite improve on average by 10–15 %.

Keywords: ceramic-matrix composite, Joule heating, Seebeck effect, microstructure homogenization.

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