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Study of Bonding Strength of Plasma‐Sprayed Ti‐Al Coating on Mild Steel Substrate
Author(s) -
Adachi Shinichiro,
Nakata Kazuhiro
Publication year - 2007
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.200731217
Subject(s) - materials science , coating , substrate (aquarium) , composite material , adhesive , surface roughness , polishing , bonding strength , bond strength , surface finish , phase (matter) , metallurgy , layer (electronics) , oceanography , chemistry , organic chemistry , geology
The effect of the surface roughness of a mild steel substrate on the adhesive strength of a plasma‐sprayed Ti‐Al coating was examined. The substrate surface was prepared by grit blasting or mirror polishing, and the bonding mechanism between the coating and the substrate is discussed. The adhesive strength of the Ti‐Al coatings varied from 55 to 60 MPa with changes in the roughness from 1.2 to 7.5 µm. The adhesive strength of the Ti‐Al coating sprayed onto a mirror‐polished substrate was 25 MPa. The adhesive strength of a sprayed Ti coating was also affected by the roughness, but that of a sprayed Al coating was not. The bonding mechanism should be a combination of the mechanical anchoring of the Ti compound phase in the coating and the metallurgical bonding of the Al phase to the mild steel substrate.