Investigation of wear resistance of high velocity oxy-fuel sprayed WC-Co and [Cr.sub.3][C.sub.2]-NiCr coatings/ Greituoju liepsniniu purskimu suformuotu WC-Co ir [Cr.sub.3][C.sub.2]-NiCr dangu atsparumo dilimui tyrimas

In the present work, the comparative investigation of wear resistance was carried out for two types of thermal spray coatings--tungsten carbide-based (WC-Co) and chromium carbide-based ([Cr.sub.3][C.sub.2]-NiCr) coatings deposited by high velocity oxy-fuel (HVOF) spraying process. The wear mechanism was investigated in the interrelationship with wear particles formation. Wear resistance of coatings was evaluated by tribotester FALEX T-09. The wear debris after scuffing were studied by atomic force microscopy. Metallographical investigation was carried out using optical microscopy and scanning electron microscopy (SEM). X-ray energy dispersion microprobe analysis was used for the investigation of the composition of coatings. The obtained results show that WC-Co coatings are characterized by better tribological characteristics. Wear resistance of coatings was connected with the microstructure. Straipsnyje aprasomi didelio greicio liepsniniu purskimu suformuotu volframo karbido (WC-Co) ir chromo karbido ([Cr.sub.3][C.sub.2]-NiCr) dangu atsparumo dilimui tyrimai. Dangu dilimo procesas nagrinejamas susiejant ji su dilimo daleliu sandara. Dangu atsparumas dilimui buvo tiriamas FALEX T-09 irenginiu. Dilimo daleles buvo analizuojamos atomines mikroskopijos budu (AFM). Dangu metalografiniai tyrimai atlikti optines ir skenuojamosios elektronu mikroskopijos (SEM) budais. Dangu sudeciai nustatyti naudota dispersine rentgeno spinduliu mikroanalize. Is gautu rezultatu galima spresti, kad WC-Co dangos pasizymi geresnemis tribologinemis charakteristikomis. Nustatyta, kad dangu atsparuma dilimui nulemia ju mikrostruktura. [TEXT NOT REPRODUCIBLE IN ASCII.]