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1 edition of An investigation of substrate effects on type two hot corrosion of marine gas turbine materials found in the catalog.

An investigation of substrate effects on type two hot corrosion of marine gas turbine materials

Michael J. Shimko

An investigation of substrate effects on type two hot corrosion of marine gas turbine materials

by Michael J. Shimko

  • 219 Want to read
  • 19 Currently reading

Published by Naval Postgraduate School in Monterey, California .
Written in English

    Subjects:
  • Mechanical engineering

  • ID Numbers
    Open LibraryOL25454453M

    Corrosion is a natural process that converts a refined metal into a more chemically stable form such as oxide, hydroxide, or is the gradual destruction of materials (usually a metal) by chemical and/or electrochemical reaction with their environment. Corrosion engineering is the field dedicated to controlling and preventing corrosion.. In the most common use of the word, this means. A turbine blade is the individual component which makes up the turbine section of a gas turbine or steam blades are responsible for extracting energy from the high temperature, high pressure gas produced by the turbine blades are often the limiting component of gas turbines. To survive in this difficult environment, turbine blades often use exotic materials like.

      The type II hot corrosion behavior of NiCr20 model alloys with the additional alloying elements, iron and cobalt, is investigated at °C in synthetic air + % SO 2 with two different salt deposits. For the cobalt‐containing alloy, an increased metal loss is observed, whereas the iron additions decrease the corrosion attack. Two forms of hot corrosion are generally recognized: Type I (high temperature), which typically occurs between the temperatures of °C and °C (°F and °F), with a maximum at about °C (°F), characterized by the buildup of a nonprotective oxide layer as oxidation and sulfidation destroy the metal substrate; and Type II.

    As described in chapter 2, the primary purposes of high-temperature structural coatings are to enable high temperature components to operate at even higher temperatures, to improve component durability, and to allow use of a broader variety of fuels in land-based and marine-based gh high-temperature coatings protect the substrate, the demarcation between coating and substrate. Topics: Corrosion resistance, Thermal barrier coatings, Coatings, Corrosion, Ceramics, Chemistry, Cathode ray oscilloscopes, Electron beams, Engines, Marine gas turbines Investigation of the Part-Load Performance of Two MW Regenerative Marine Gas Turbines.


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An investigation of substrate effects on type two hot corrosion of marine gas turbine materials by Michael J. Shimko Download PDF EPUB FB2

An Investigation of Substrate Effects on Type Two Hot Corrosion of Marine Gas Turbine Materials by Michael J. Shimko Lieutenant, United States Navy B.S., University of Maryland, Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN MECHANICAL ENGINEERING from the NAVAL POSTGRADUATE SCHOOL June Author.

The effect of other alloying elements on the hot corrosion resistance of superalloys has been reported as well. Cerium, lanthanum, zirconium, yttrium, and scandium significantly increase the resistance as they improve the adhesion between the alloy and the protective n, platinum, and hafnium have all been shown to have beneficial effects, at least on LTHC by:   Formations of YVO 4 crystals as hot corrosion products were observed during the hot corrosion tests in the Na 2 SO 4 1 V 2 O 5 salt mixture medium at.

Gas turbines will be one of the most important horizontal technologies and will play an essential role in meeting these requirements.

Gas turbine technology is considered as horizontal due to its capacity to be widely applied across many different types of power plant configurations, while running with different fuels (coal gas, natural gas, hydrogen, liquid fuels, etc.).Cited by: 3.

The Control of Hot Corrosion in Marine Gas Turbines levels prevailing in naval engines are described in relation to the normal operating profile and the incidence of corrosion effects in relation to temperature.

Results of rig evaluation of materials and coatings are given. Erosion resistance, the combined effects of erosion/corrosion and Cited by: 4. Hot corrosion test. Cyclic hot corrosion resistance of the coatings was tested in static air at °C using a muffle furnace.

A hot corrosion cycle was started by painting saturated aqueous salt-solution of 25 wt% NaCl + 75 wt% Na 2 SO 4 at the surface of specimens on a heated tab.

The total salt film ranged from 1 to mg/cm painted samples were kept at °C for 20 h before. H.E. Evans, in Shreir's Corrosion, The Protective Oxide Layer. High temperature coatings rely, for protection, on the formation of a dense and adherent surface oxide layer that is chemically stable, thickens slowly with time at temperature, and has good adherence to the coating.

These are, of course, the same requirements as are needed in the design of oxidation-resistant alloys. The gas turbine engine under investigation in this paper was in service after major overhaul for about 2 h at A.M. on 18 October, and sulphides in the substrate. Hot corrosion has.

A gas turbine, also called a combustion turbine, is a type of continuous and internal combustion main elements common to all gas turbine engines are: an upstream rotating gas compressor; a combustor; a downstream turbine on the same shaft as the compressor.; A fourth component is often used to increase efficiency (on turboprops and turbofans), to convert power into.

Erosion–corrosion is a relatively new branch of materials science with the first reference to erosion–corrosion (as recorded in Scopus) being in a paper by Venzcel et al. on the corrosion and erosion–corrosion of copper alloys and a low carbon steel in a 3 weight % NaCl solution in 1 Since then the number of papers published on.

Owing to the excellent strength and corrosion resistance at higher temperatures, nickel-based superalloys are widely used as the materials for the hot components in aero-engines and land-based gas turbines, such as blades, turbine discs, and combustion chambers [1,2,3].However, due to the existence of various impurities such as sulfur, sodium, potassium, and vanadium in the fuels, SO 2.

The blade under investigation belongs to a 30 MW gas turbine engines used in marine applications and is made of Nickel-Base superalloys. gas turbine blade materials should be assessed.

In about an apparently new form of hot corrosion attack of gas turbine airfoils was identified during low-power, low-metal-temperature operation of a marine gas turbine. The rate of this corrosion was substantially greater at about ° C than that usually observed for sulfate-induced hot corrosion at ° to ° C.

The same type of. The components of gas-turbine engines operating in marine environments are highly susceptible to hot corrosion, which is typically classified as Type II (– °C) and Type I (– °C. The hot-corrosion resistance of two /- eutectic alloys, Ni Nb Al and NiNb-6Cr Al, has been studied using three techniques: (1) a salt-coated test, in which the specimens are.

The effects of Ca 2+ on the corrosion behavior of iron is negligible, however, Cl − plays an important role in accelerating the corrosion activity with the increased concentration and temperature.

With increased concentrations of CO 3 2− and SiO 3 2−, the corrosion resistance of iron is largely improved, which is attributed to the. MCrAlX (M: Ni or Co or both, X: minor elements) coatings have been used widely to protect hot components in gas turbines against oxidation and heat corrosion at high temperatures.

Understanding the influence of the X-elements on oxidation behavior is important in the design of durable MCrAlX coatings. In this study, NiCoCrAlX coatings doped with Y + Ru and Ce, respectively, were deposited. The effects of both Cr and Pt additions to aluminide coatings on the IN nickel-base superalloy substrate under low temperature (°C) hot corrosion conditions have been studied.

In this investigation, it was found that the structure of the Cr modified platinum-aluminide coatings is most dependent on the sequence of modifying element. The cold gas dynamic spray (CGDS) method has been considered a promising technology to produce a metallic bond coat for thermal barrier coating (TBC) systems.

In this study, CoNiCrAlY bond coats produced by CGDS method were coated with yttria-stabilized zirconia (YSZ) by electron beam physical vapor deposition (EB-PVD).

TBCs were subjected to 50 wt % V2O5 and 50 wt % Na2SO4 molten hot. Coatings for turbine blades possess some attractive properties like oxidation and hot corrosion resistance, maintain their strength, cohesion and etc. High temperature damages divide in three general groups: High temperature corrosion type II (–°C), High temperature corrosion type I (–°C), Oxidation (°C and higher).

There are three types of high temperature coating:. Ni-Mo-ZrO 2 composite coatings were produced by pulse electrodeposition technique from alkaline electrolytes containing dispersed ZrO 2 nanopowder.

The structure, microhardness, corrosion properties and tribological properties of Ni-Mo-ZrO 2 composites with different content of molybdenum and ZrO 2 have also been examined. Structural characterization was performed using X-ray diffraction ([email protected]{osti_, title = {Gas turbine blade life assessment and repair guide}, author = {Swaminathan, V P and Lowden, P and Liburdi Engineering Ltd., Hamilton, ON}, abstractNote = {Combustion turbine hot section rotating blades are fabricated from nickel-base superalloys and operate at high temperatures.

Both metallurgical and mechanical property degradation of the blading material. Functional coatings are widely used in energy generation equipment in industries such as renewables, oil and gas, propulsion engines, and gas turbines.

Intelligent thermal spray processing is vital in many of these areas for efficient manufacturing. Advanced thermal spray coating applications include thermal management, wear, oxidation, corrosion resistance, sealing systems, vibration and.