Preparation and characterization of plasma sprayed Ni3Al–hBN composite coating

Ni3Al–hBN composite powders were manufactured by spray drying technology, and then plasma sprayed to form the coatings. The influence of hBN addition amount on the flowability and apparent density of the composite powders, as well as the mechanical and tribological properties of the as-sprayed coati...

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Bibliographic Details
Published in:Surface & coatings technology 2010-12, Vol.205 (7), p.2419-2424
Main Authors: Du, Lingzhong, Zhang, Weigang, Liu, Wei, Zhang, Jingmin
Format: Article
Language:English
Subjects:
Applied sciences
Bonding strength
Bulk density
Coatings
Composite coating
Composite coatings
Contact of materials. Friction. Wear
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Friction
Hardness
hBN
Lubrication
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Physics
Plasma spray
Production techniques
Solid lubricant
Spray drying
Surface treatment
Surface treatments
Tribology
Wear
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Summary:Ni3Al–hBN composite powders were manufactured by spray drying technology, and then plasma sprayed to form the coatings. The influence of hBN addition amount on the flowability and apparent density of the composite powders, as well as the mechanical and tribological properties of the as-sprayed coatings was evaluated. The results indicate that the spherical powders with uniformly distributed compositions are successfully manufactured by spray drying technology. Both the flowability and apparent density of the Ni3Al–hBN powders, as well as the bond strength and hardness of the composite coatings decrease with the increase of hBN content. Addition of hBN less than 10wt.% reduces the friction coefficient and brittle fracture of the coatings, which is beneficial to improve the tribological properties of the Ni3Al–hBN composite coatings. However, high hBN addition, damaging the bond in the coating, will deteriorate the wear resistance of the coating. The Ni3Al–hBN composite coating containing 10%hBN shows the optimum properties combining strength and hardness with tribological properties. ► Ni3Al–hBN powders are successfully manufactured by spray drying. ► With an increase of hBN, hardness and bond strength of coating decrease. ► With an increase of hBN, friction coefficient and its fluctuation decrease. ► When hBN10%, bond weakening controls.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2010.09.036