Study on distribution uniformity of hard phases in composite coating

ABSTRACT

Five hard-phase aluminium-based composite coating types with volume fractions of 12.5%, 25%, 37.5%, and 50%, respectively, were used. The addition of a large hard phase enhanced the coating densification. An increase in hard-phase content in the coating distributes more uniformly, but when the hard-phase content is too high, the hard phase is more likely to agglomerate, which decreases the distribution uniformity. Therefore, all those with a 25% volume fraction had the best uniformity. The kinetic energy of the hard-phase particles affects the distribution uniformity by changing the deposition method. When the kinetic energy is small, particles cannot be deposited effectively (Al₂O₃-8). When the kinetic energy is large, the metal-based plastic flows to form a fracture belt, which reduces the distribution uniformity (WC-72). When the kinetic energy does not cause the deposition method to change, the uniformity of the hard-phase distribution is similar.

KEYWORDS:

• Cold-sprayed
• composite coating
• uniformity
• agglomerate

Acknowledgements

The project is supported by the National Natural Science Foundation of China [grant number 51601157].

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The project is supported by the National Natural Science Foundation of China [grant number 51601157].