Influence of Heat Treatment on the Phase Composition and Microhardness of Coatings Based on Ti&lt;sub&gt;3&lt;/sub&gt;SiC&lt;sub&gt;2&lt;/sub&gt;/ TiC

The article presents the study results of detonation spraying parameters on the phase composition and tribological properties of NiCr-Al2O3 powder coatings. The spraying was carried out at a ratio of the acetylene-oxygen mixture O2 /C2H2=1.856. The detonation barrel filling volume with an explosive gas mixture varied from 30% to 68%. It is determined that the phase composition of the NiCr-Al2O3 coatings varies depending on the degree of detonation barrel filling. With an increase in the detonation barrel’s filling volume, the intensity of the NiCr diffraction peaks is decreased, and the intensity of the a-Al2O3 reflexes is increased, which indicates an increase in the content of the Al2O3 phase. When low filling volume, there is determined a low coating density and uneven roughness. The tribological test results showed that with an increase in the detonation barrel filling volume, there is a decrease in the wear volume, which confirms the increase in the coatings wear resistance. Determined that the lowest friction coefficient was recorded in the sample obtained at the barrel filling volume 68%. The coatings’ high wear resistance is associated with an increase in the alpha phase volume fraction of a-Al2O3 and coatings density.

Section: Materials and Research Methodsmentioning

confidence: 99%

Effect of the detonation-spraying mode on the tribological properties of NiCr-Al2O3 coatings

Rakhadilov¹,

Буйткенов²,

Kabdykenova³

et al. 2021

“…The particle size of the powder is up to 22-45 µm. Detonation coatings were obtained on a computerized complex of new generation detonation spraying CCDS2000 (Computer Controlled Detonation Spraying), [21][22][23].…”

Section: Materials and Methods Of Researchmentioning

confidence: 99%

The effect of detonation spraying on the phase composition and hardness of Al2O3 coatings

Rakhadilov¹,

Buytkenov²,

Kakimzhanov³

et al. 2020

The article were studied the effect of detonation spraying on the structure and properties of Al 2 O 3 coatings. It was determined that reducing the delay time between shots is leading to increase the hardness and elastic module of Al 2 O 3 coatings. It was found on the basis of X-ray diffraction analysis that the main reason for the increasing in hardness with a decreasing in the delay time between shots is associated with increasing in the volume fraction of α -Al 2 O 3 phase. The studies of X-ray diffraction presented that the highest content of the phase is achieved when the coatings are formed with a delay time between shots of 0.25 s. It was found that increasing in the volume fraction of the α -Al 2 O 3 phase is caused by the secondary recrystallization γ → α , which occurs due to the heating of particles during coating formation, i.e. due to increasing in temperature above 1100 • C in single spots of the coating when they are put each other.

“…Experimental researches were conducted on the effect of technological parameters of the detonation spraying process on the phase composition and properties of Ti-Si-C coatings [16][17][18][19][20]. The experiments were carried out based on the Scientific research center «Surface Engineering and tribology» of the non-profit limited company "Sarsen Amanzholov East Kazakhstan University" on the industrial computerized detonation spraying complex CCDS 2000 [21].…”

Section: Phase Composition and Nanohardness Of Detonation Coatingsmentioning

confidence: 99%

Obtained of powder coatings by detonation spraying

Буйткенов¹,

Rakhadilov²,

Sagdoldina³

et al. 2020

In this work, consider the aspects of obtaining powder coatings that possessing certain working properties obtained by detonation spraying. Experimental research were carried on the effect of technological parameters of the detonation spraying process on the phase composition and properties of Ti-Si-C coatings. It is determined that when the volume of filling the detonation barrel with an explosive mixture increases to 70% in the detonation wave flow, the Ti 3 SiC 2 powder partially decomposes into TiC consequently the high-speed shock interaction of heated to high temperatures. Installed that when filling the barrel with an explosive mixture of 50% and 60%, a low extent of decomposition of Ti 3 SiC 2 powder can be achieved. It is determined that an increase in the volume content of the TiC phase in the composition of coatings bring to a decrease in the hardness of the TiC -Si coating.