Structural Phase Transformations in Detonation Coatings Based on Ti3SiC2 after Pulse-Plasma Effect

Abstract

This work presents the results of the study on the effect of pulse-plasma treatment on the structural-phase states of the surface layer of detonation coatings based on Ti3SiC2. Structural-phase studies were carried out by three main methods: scanning electron microscopy, transmission electron diffraction microscopy on thin foils and X-ray structural analysis. It was determined that after the pulse-plasma treatment, an increase in the intensity of the Ti3SiC2 peaks was observed, and the appearance of new reflections (101, 102, 112, 204, 1110, 0016) of this phase was detected, which indicates the increase in the MAX-phase content. It was determined that after the pulse-plasma treatment, the fraction of voids (pores) and the particle area decreased and the microstructure became more homogeneous, which resulted in the densification of the Ti3SiC2-based detonation coating. It was found that the process of detonation spraying with subsequent pulse-plasma treatment resulted in the formation of a Ti3SiC2-based coating, with TSC carbosilicide (Ti3SiC2) [00] plane reflexes, lamellar layered structure, and reduced porosity.

Influence of Pulse-Plasma Treatment Distance on Structure and Properties of Cr3C2-NiCr-Based Detonation Coatings

“…Metal-ceramic coatings of Cr 3 C 2 -NiCr system obtained by gas-thermal spraying methods are also used to reduce wear and protect against corrosion at high temperatures in parts of gas turbines operating under dry-friction conditions and used in various industries: electric power, oil refining, and the aerospace industry [5][6][7]. These ceramic-metal coatings are deposited using different gas-thermal spraying methods, such as plasma spraying, detonation spraying, and high-velocity gas-flame spraying (HVOF, HVAF) [8][9][10][11][12][13][14][15][16]. While the HVOF and HVAF methods produce high-quality Cr 3 C 2 -NiCr coatings, they do come with some drawbacks.…”