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Paper Information

Journal:   JOURNAL OF NEW MATERIALS   SUMMER 2015 , Volume 5 , Number 4 (20); Page(s) 165 To 174.
 
Paper: 

PRODUCTION AND CHARACTERIZATION OF PLASMA SPRAYED NANOSTRUCTURED CR2O3 COATINGS

 
 
Author(s):  KHOSRAVI M.*, LOTFI B., ERFANMANESH M., RAMAZANI M.
 
* DEPARTMENT OF ENGINEERING, SOUTH TEHRAN BRANCH, SLAMICAZAD UNIVERSITY
 
Abstract: 

In the present study, Cr2O3 nanostructured and conventional (microstructured) coatings have been prepared by atmospheric plasma spraying (APS) on carbon steel substrates. Phase composition and structural properties of coatings were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Also, the mechanical properties of coatings such as microhardness were evaluated. Nanostructured Cr2O3 coating exhibited a bimodal microstructure consisting of nanosized particles retained from the powder and microcolumnar grains formed through the resolidification of the molten part of powder, whereas the microstructure of conventional Cr2O3 coating consisted of columnar-grain splats. The results revealed that nanostructured coating, due to unique microstructure container of nanozones, presented improved microhardness and fracture toughness as compared to the conventional coating.

 
Keyword(s): MICROSTRUCTURED, PLASMA SPRAYING, CR2O3, MICROHARDNESS
 
References: 
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