Tailoring a High Temperature Corrosion Resistant FeNiCrAl for Oxy-Combustion Application by Thermal Spray Coating and HIP

Abstract

Oxy-fuel combustion combined with CCS (carbon capture and storage) aims to decrease CO2 emissions in energy production using fossil fuels. Oxygen firing changes power plant boiler conditions compared to conventional firing. Higher material temperatures and harsher and more variable environmental conditions cause new degradation processes that are inadequately understood at the moment. In this study, an Fe-Ni-Cr-Al alloy was developed based on thermodynamic simulations. The chosen composition was manufactured as powder by gas atomization. The powder was sieved into two fractions: The finer was used to produce thermal spray coatings by high velocity oxy-fuel (HVOF) and the coarser to manufacture bulk specimens by hot isostatic pressing (HIP). The high temperature corrosion properties of the manufactured FeNiCrAl coating and bulk material were tested in laboratory conditions simulating oxy-combustion. The manufacturing methods and the results of high temperature corrosion performance are presented. The corrosion performance of the coating was on average between the bulk steel references Sanicro 25 and TP347HFG. OPEN ACCESSCoatings 2015, 5 710

Microstructure, Wear Behavior and Corrosion Resistance of WC-FeCrAl and WC-WB-Co Coatings

“…Thermally sprayed coatings are often used to increase the resistance of the parent material against corrosion and wear [3][4][5][6][7][8][9][10][11][12][13][14][15]. The desired properties of coatings applied by the high-velocity oxygen fuel (HVOF) method also include high density and good adhesion, which are characterized by the ability to form coatings with a small portion of oxides and phase transformations [16][17][18][19].…”

Ketahanan Oksidasi Baja Super Austenitik 15%cr-25%ni Pada Temperatur 850 °c

“…Gambar tersebut memperlihatkan bagian permukaan sampel quenching yang dipanaskan pada T = 850°C selama 15 jam lebih mengalami kerusakan dibandingkan dengan sampel as-cast yang dipanaskan pada T = 850°C dengan jangka waktu yang sama. Foto morfologi tersebut cukup memperlihatkan kerusakan permukaan akibat oksidasi [9,10]. Permukaan sampel ascast (Gambar 3(a)) terlihat mulus dan batas poros masih utuh/tidak terkorosi, sedang permukaan sampel quenching (3b) terlihat jelas kerusakan akibat korosi, kerapuhan dan serpihan material (korodan) terdistribusi disekitar posisi porositas.…”