Multi-Walled CNT Reinforcement to Thermal Spray Coatings

Abstract

Thermal spraying coating techniques have emerged as very effective surface protection technology to apply protective coatings for corrosion and wear resistance applications. These coatings have gained more importance in recent past. Advances in powder and wire production have resulted in development of various types of surface coatings with excellent wear and corrosion resistance properties. Because of excellent mechanical, thermal and electrical properties of Carbon Nanotubes, CNTs reinforced composite coatings are being developed for various applications, e.g. automotive, aerospace and sports equipment industry. It is observed that if properly deposited, these CNTs ceramic composite coatings can provide improved properties like wear and corrosion resistance. It has been found that CNTs composite coatings can be successfully deposited by thermal spraying techniques, and these coatings provide better performance than conventional coatings. This paper reviews the performance of such coatings developed by various researchers.

Corrosion Behaviour of HVOF Sprayed Coatings on ASME SA213 T22 Boiler Steel in an Actual Boiler Environment

“…Kaushal et al [13] used detonation gun spray method to deposit Ni-20Cr onto ASTM A213 TP347H boiler steel and results revealed that coating had potential to lower the high temperature corrosion. Goyal et al [14] outlined the role of corrosion and effect of coatings on the properties of various engineering materials and concluded that Ti-Al-N and Cr-Al-N exhibit greater plastic hardness which contributes to its better wear performance. But Cr-Al-N proved to have exceptionally high wear and oxidation resistance.…”