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Thermally sprayed coatings resistant to erosion and corrosion for power plant boilers - A review

“…From among the many thermal spraying methods, in practice, for the protection of boiler elements, the flame, arc, plasma and HVOF methods are used. The flame and plasma methods are relatively rarely used, due to the complexity of the process (flame with remelting) or the relatively high costs (plasma) [12][13][14]. An example of the interconnection between the wear mechanism, the used spraying technology and the type of the coating material is presented in Table 1.…”

Cyclic high temperature oxidation of HFPD thermal sprayed CoNiCrAlY coatings under simulated gas turbine and furnace environments

“…The elongated appearance of these hard, brittle oxides promotes high stress concentration, crack nucleation and sudden crack growth. 11,12 Some adhesive failure along the substrate/coating interface was also observed. After cyclic oxidation testing, the samples maintain their adherence strength without any significant change.…”

Cavitation Damage Behavior of Inconel 625 Coating Layer by Arc Thermal Spraying Method in Sea Water

“…Inconel 625의 코팅 방법으로는 초고속 화염용사(High Velocity Oxy-Fuel, 이하 HVOF) 코 팅기술이 다른 용사코팅 기술에 비해 매우 작은 기 공율(1 % 이내)과 산화물(평균 3.6 % vol. )을 생성 하며, 높은 경도(200~450 H V )를 나타내어 침식-부 식 환경에서 주로 적용된다 1,4,5) . 그러나 해양환경에 서 해양 구조물, 해양 플랜트 및 선박 등과 같은 대 형 강 구조물의 내구성 향상을 위한 Inconel 625 용 사코팅 적용은 고품질 코팅 층의 HVOF 보다는 저 품질의 코팅 층을 형성하는 아크 용사코팅(Arc Spray Coating, 이하 ASC) 기술이 더 합리적인 것으로 판 단된다.…”