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Nishi-Tokyo-shi, Japan

Galetz M.C.,Dechema Institute | Bauer J.T.,Dechema Institute | Schutze M.,Dechema Institute | Noguchi M.,Ebara Corporation | And 2 more authors.
Materials and Corrosion

Previous laboratory studies reported in the literature and field experience have revealed the accelerating effect of the heavy metals lead and zinc on the corrosion behaviour of materials used in waste incineration plants. The major problem is that heavy metal containing chloride and sulphate salts usually have relatively low melting points, often below the metal temperature of the boiler surfaces. While the negative influence of lead and zinc is well-known, copper is another heavy metal that can occur in high amounts of up to 2000 mg/kg in refuse-derived fuel, which is the fuel produced by shredding and dehydrating solid municipal waste that is burned in modern waste-to-energy plants. The impact of copper additions on the corrosion behaviour of one iron-based austenitic alloy 1.4952 and three nickel-based alloys 2.4856 (alloy 625), 2.4633 (alloy 602 CA), 2.4605 (alloy 59), which are often used in waste incineration plants was investigated. The results of these studies clearly show the strong corrosive effect of copper content in salt mixtures on the corrosion of steels and nickel-based alloys. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

De Dieu Mugiraneza J.,University of Ryukyus | Miyahira T.,Ebara Environmental Plant Co. | Sakamoto A.,Sanken Electric Co. | Cheny Y.,University of Ryukyus | And 3 more authors.
Japanese Journal of Applied Physics

The microcrystalline phase obtained by adopting a two-step rapid thermal annealing (RTA) process for rf-sputtered silicon films deposited on thermally durable glass was characterized. The optical properties, surface morphology, and internal stress of the annealed Si films are investigated. As the thermally durable glass substrate allows heating of the deposited films at high temperatures, micro-polycrystalline silicon (micro-poly-Si) films of uniform grain size with a smooth surface and a low internal stress could be obtained after annealing at 750 °C. The thermal stress in the Si films was 100 times lower than that found in the films deposited on conventional glass. Uniform grains with an average grain size of 30nm were observed by transmission electron microscopy (TEM) in the films annealed at 800 °C. These micro-poly-Si films have potential application for fabrication of uniform and reliable thin film transistors (TFTs) for large scale active-matrix organic light emitting diode (AMOLED) displays. © 2010 The Japan Society of Applied Physics. Source

Galetz M.C.,Dechema Institute | Bauer J.T.,Dechema Institute | Schutze M.,Dechema Institute | Noguchi M.,Ebara Corporation | Cho H.,Ebara Environmental Plant Co.
Journal of Thermal Spray Technology

The accelerating effect of heavy metal compounds on the corrosive attack of boiler components like superheaters poses a severe problem in modern waste-to-energy plants (WTPs). Coatings are a possible solution to protect cheap, low alloyed steel substrates from heavy metal chloride and sulfate salts, which have a relatively low melting point. These salts dissolve many alloys, and therefore often are the limiting factor as far as the lifetime of superheater tubes is concerned. In this work the corrosion performance under artificial salt deposits of different coatings, manufactured by overlay welding, thermal spraying of self-fluxing as well as conventional systems was investigated. The results of our studies clearly demonstrate the importance of alloying elements such as molybdenum or silicon. Additionally, the coatings have to be dense and of a certain thickness in order to resist the corrosive attack under these severe conditions. © 2013 ASM International. Source

Chen J.,Chubu University | Ninomiya Y.,Chubu University | Naganuma H.,Tohoku Electric Power Co. | Sasaki Y.,Tohoku Electric Power Co. | And 5 more authors.
Fuel Processing Technology

Protective surface treatment via several kinds of cost-effective thermal spraying alternate materials was developed and investigated in this study for heat exchanger tubes in waste incinerators with quite aggressive environment. Different thermal spraying materials including Fusible Ni-SA-a, Fusible Ni-SA-b, Fusible Ni-SA-c, NiCr-TS and NiCr-WEL were investigated to evaluate their performance of corrosion resistance. Three corrosion tests including high-temperature wettability test, long-term adhesion force experiment and hot corrosion test were performed, respectively. As has been proven from experimental results, the specimen coated with Fusible Ni-SA-c exhibited high contact angles in both air and simulated flue gas condition, which indicated a low ash wettability and liquid-bridge force. The coatings of Fusible Ni-SA-c and Fusible Ni-SA-b resulted in quite low adhesion force between ash and specimen, illustrating their good performance to improve the tube corrosion resistance. Besides, the weight losses of specimens coated with Fusible Ni-SA-c and Fusible Ni-SA-b due to corrosion by ash were noticeably decreased, in particular Fusible Ni-SA-c caused almost zero corrosion. Fusible Ni-SA-c decreased the amount of ash deposition on the tube surface of SUS304 by 35%. These corrosion tests supported Fusible Ni-SA-c as thermal spraying material with excellent corrosion resistance, which is able to prevent the heat transfer surface from high-temperature corrosion and thus enhance the service-life of the tube. Furthermore, among these corrosion tests, it was found that the high-temperature wettability test is an effective approach to evaluate the performance of different corrosion-resistant materials. © 2015 Elsevier B.V. Source

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