STRUCTURE AND MECHANICAL PROPERTIES OF THE Ni-Cr-Al COATING OBTAINED BY DETONATION SPRAYING METHOD

This paper discusses the results of studies of the properties of Ni-Cr-Al wearresistant detonation coatings obtained at different values of the volume of filling the detonation barrel with an explosive acetylene-oxygen mixture. The thickness of the obtained detonation coatings NiCr-Al was 214-288µm. When the barrel is filled with an explosive gas mixture of 40%, the coating is not dense enough, with noticeable boundaries between individual particles, which may be the result of insufficient heating and acceleration of the particles of the sprayed powder. Higher values of microhardness were obtained at 50% filling of the barrel. The results of tribological tests of coatings have shown that the coating applied when the volume of filling the detonation barrel with an explosive mixture is up to 60 %, has a lower wear rate than other coatings. Visible that the mass loss at 50% of the detonation barrel filling volume is less than other coatings.

1. Yu-Juan Zhang, Xiao-Feng Sun , Heng-Rong Guan etc. 10500C isothermal oxidation behavior of detonation gun sprayed NiCrAlY coating // Surface and Coatings Technology. – 2002. – V.161. –

2. № 2-3. – Р. 302-305.

3. Zhang Y.J., Sun X.F., Zhang Y.C. etc. A comparative study of DS NiCrAlY coating and LPPS NiCrAlY coating // Mater. Sci. Eng. – 2003. – V. 360. – Р. 65-69.