Deposition, characterization and performance evaluation of ceramic coatings on metallic substrates for supercritical water-cooled reactors

Abstract

This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. A series of ceramic coatings have been prepared on P91 substrates by spray pyrolysis processes and on Zr-2.5Nb substrates by a plasma electrolytic oxidation process. Preliminary results show that coatings obtained with different solution compositions and procedures can reduce the oxidation weight gain of P91 samples by factors of 2-10 for exposure times up to 500 h in deaerated supercritical water at 500°C and 25 MPa. Results also show that the weight gain of a P91 sample with an alumina (Al 2 O 3 ) coating is about nine times less than that of uncoated P91 after exposures for 400 h in deaerated supercritical water at 650°C and 25 MPa. These results indicate that the Al 2 O 3 coating shows promising results for preventing oxidation of P91 under supercritical water conditions. The samples with ceramic coatings on Zr-2.5Nb substrates show marginally improved corrosion resistance compared to the bare substrates.Crown

Vacuum-arc chromium-based coatings for protection of zirconium alloys from the high-temperature oxidation in air

“…Extensive investigations have been carried out to find out the mechanisms of the hightemperature zirconium alloy oxidation in different media [1][2][3][4][5][6][7] and to develop the zirconium alloy protection techniques [8][9][10][11][12][13][14]. It has been established that the ion implantation of different elements can change the structure and the composition of the zirconium oxide and thus improve its protective properties [8,9].…”

Effect of Al Concentration on Microstructure and Properties of AlNbTiZr Medium-Entropy Alloy Coatings

“…[11][12][13][14], ceramic coatings (CrC, SiC, CrN, MAX phase materials, etc.) [15][16][17][18][19][20] and composite coatings (Cr/CrN, TiN/TiAlN, etc.) [20,21].…”

Steam Oxidation of Aluminide-Coated and Uncoated TP347HFG Stainless Steel under Atmospheric and Ultra-Supercritical Steam Conditions at 700 °C

“…Considerable efforts have been dedicated to the development of coatings for super-critical power plants [12][13][14][15][16][17][18][19] but little work has been published regarding the behaviour and coatings under high pressure steam. Coatings such as MCrAlY overlays (M = Ni, Fe) [20,21] ceramics such as Al 2 O 3 [22], and diffusion aluminides deposited by slurry application [23][24][25] or by pack cementation [26] have been studied over the past few years and in most cases these coatings displayed a substantial improvement in terms of high pressure steam oxidation resistance. For instance, specimens of P92, both uncoated and coated with a slurry aluminide were exposed to real operating conditions in a bypass of a steam power plant and the results were compared to those obtained in the laboratory under atmospheric steam [23].…”