Last edited by Mazujind
Monday, April 27, 2020 | History

3 edition of Molten salt corrosion of SiC and Sib□-s□b3b□-s□sNb□-s□b4b□-s□s found in the catalog.

Molten salt corrosion of SiC and Sib□-s□b3b□-s□sNb□-s□b4b□-s□s

Molten salt corrosion of SiC and Sib□-s□b3b□-s□sNb□-s□b4b□-s□s

  • 40 Want to read
  • 28 Currently reading

Published by Lewis Research Center, NASA, National Technical Information Service, distributor in Cleveland, Ohio, [Springfield, Va .
Written in English

    Subjects:
  • Ceramics.,
  • Corrosion.,
  • Heat exchangers.,
  • Molten salts.,
  • Thermodynamics.

  • Edition Notes

    StatementNathan S. Jacobson, James L. Smialek, and Dennis S. Fox.
    SeriesNASA technical memorandum -- 101346
    ContributionsSmialek, James L., Fox, Dennis S., Lewis Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17114600M

      Free Online Library: Improvement of the properties of AZ91D magnesium alloy by treatment with a molten [3]-NaCl salt to form an Mg-Al intermetallic surface layer. by "JCT Research"; Business Chemicals, plastics and rubber Aluminum compounds Corrosion (Chemistry) Corrosion and anti-corrosives Intermetallic compounds Magnesium alloys .


Share this book
You might also like
Genealogical notes and lineages

Genealogical notes and lineages

Conflict in Nepal

Conflict in Nepal

Monkeys

Monkeys

Structured computer project management

Structured computer project management

beauty of a life of service

beauty of a life of service

Common weeds from Iran, Turkey, the Near East, and North Africa

Common weeds from Iran, Turkey, the Near East, and North Africa

State-level planning for community colleges

State-level planning for community colleges

Report on the evaluation survey on the development of land in Ferozepore and Faridkot Districts with financial assistance of Agricultural Refinance Corporation.

Report on the evaluation survey on the development of land in Ferozepore and Faridkot Districts with financial assistance of Agricultural Refinance Corporation.

validation of a biographical inventory as a predictor of college success

validation of a biographical inventory as a predictor of college success

HIV/AIDS & housing services in Newham

HIV/AIDS & housing services in Newham

The history of New-Hampshire.

The history of New-Hampshire.

Civil liberties and the arts

Civil liberties and the arts

Discovering classic horror fiction I

Discovering classic horror fiction I

Molten salt corrosion of SiC and Sib□-s□b3b□-s□sNb□-s□b4b□-s□s Download PDF EPUB FB2

Molten Salt Corrosion of SiC and Si 3 N 4 Ceramics‐ R. TRESSLER The writers are with the Department of Material Sciences, Ceramic Science Section, The Pennsylvania State University, University Park, Pa.

Cited by: The above results suggest that it is at least in theory possible to reduce the salt potential with Be additions to suppress the corrosion of SiC in fluoride salt without precipitating out metal carbides by controlling the concentration of dissolved Be° species in the salt to be lower than ∼ 10 −14 mol% for C-rich condition, and ∼ Cited by: 3.

The overall corrosion reaction is described by salt deposition, rapid dissolution of the silica scale, and accelerated oxidation. SiC and Si 3 N 4 exhibit extensive pitting and/or grain boundary attack from corrosion, which leads to a strength reduction.

One approach to limiting corrosion of SiC is the use of by: 5. Immersion corrosion tests of TiC, TiC, TiC–20 vol% SiC, TiC–40 vol% SiC and SiC have been performed in molten FLiNaK salt at °C for 25– h under argon cover gas. Hot corrosion of sintered α-SiC by thin films of Na2SO4 and Na2CO3 molten salts at °C, the type that most likely occurs in a turbine engine, reduces the strengths at.

() Corrosion of SiC induced by Hastelloy N alloy and its corrosion products in LiF–NaF–KF molten salt. Corrosion ScienceOnline publication date: 1-AugCited by: 8.

April 1st, Goals and Objectives • Goal #1 – Identify molten salt / material combinations that have long service life and meet performance needs • Goal #2 – Characterize corrosion rates, corrosion mechanisms, and methods to reduce Molten salt corrosion of SiC and Sib□-s□b3b□-s□sNb□-s□b4b□-s□s book • Objective #1 – Perform experiments that quantify corrosion.

The corrosion of SiC fiber will affect the mechanical properties of SiC f /SiC composite. Most commercial SiC fibers are made up of β-SiC. In this work, SiC fiber, SiC single crystal and high purity CVD (chemical vapor deposition) SiC were used to study the effect of oxygen impurity on the corrosion of SiC in molten FLiNaK by: °C with molten salts • Model corrosion mechanisms and kinetics • Measure corrosion rates and compare with service lifetime goals for a variety of heat transfer system materials • 30 year lifetime SunShot corrosion rate target is corrosion in molten salt CSP systems.

A pO −2 diagram for nickel in carbonate salt is presented in Fig. pO −2 is the negative log of the O −2 ion concentration, the oxide ion concentration (and basicity) increases towards the left hand side of the diagram (low value of pO −2), whilst acidity is increased toward the right (high value of pO −2) [].As reaction 2 is reversible, pO −2 can be inferred using the acid gas Cited by: 2.

The corrosion of SiC in molten FLiNaK ( mol% LiF, mol% NaF and mol% KF) salt was studied. Results reveal that oxygen impurities from SiC and salt can affect the corrosion. The Molten salt corrosion of SiC and Sib□-s□b3b□-s□sNb□-s□b4b□-s□s book behaviours of GH alloy in molten FLiNaK eutectic salt (LiF-NaF-KF: –– mol.%) were investigated in the presence and absence of graphite particles by using a static immersion corrosion : Qi Liu, Bin Leng, Jie Qiu, Huiqin Yin, Jian Lin, Zhongfeng Tang.

A hot corrosion and oxidation study of SiC/SiC and SiC/C composites was conducted to examine environmentally induced interactions with the fiber and matrix and to assess the composite degradation in the simulated molten salt environment of Cited by: 4. Fox DS, Jacobson NS.

Molten-Salt Corrosion of Silicon Nitride: I, Sodium Carbonate. J Am Ceram Soc. ; 71 (2)– [Google Scholar] Jacobson NS. Kinetics and Mechanism of Corrosion of SiC by Molten Salts.

J Am Ceram Soc. ; 69 (1)– [Google Scholar] Jacobson NS. Sodium Sulfate: Deposition and Dissolution of Silica. Oxidation. The corrosion of SiC was performed in SiC capsule with pure FLiNaK salt. Fig. 1 is Raman spectrum of CVD SiC before and after corrosion experiment. Before experiment, SiC sample has five Raman features at, and cm − features of SiC sample are consistent with the first- and second-order Raman scattering of cubic SiC (3C–SiC).Cited by: Corrosion of Si 3 N 4 under thin films of Na 2 CO 3 was investigated at °C.

Pure Si 3 N 4 and Si 3 N 4 with various additives were examined. Thermogravimetric analysis and morphology observations lead to the following detailed reaction mechanism: (I) decomposition of Na 2 CO 3 and formation of Na 2 SiO 3, (II) rapid oxidation, and (III) formation of a protective silica layer Cited by: The corrosion mechanism of Si 3 N 4 + Na 2 SO 4 /O 2 at °C was investigated.

Corrosion of both pure and additive‐containing Si 3 N 4 was studied. The reaction of Si 3 N 4 + Na 2 SO 4 consists of an initial period of slow weight loss due to Na 2 SO 4 vaporization and oxidation‐dissolution. This initial period was the same for all forms of Si 3 N 4.A second region Cited by: @article{osti_, title = {SiC/SiC Composites Technology Gap Analysis for Molten Salt Reactors}, author = {Geringer, Josina Wilna and Katoh, Yutai and Koyanagi, Takaaki and Lee, Yoonjo}, abstractNote = {The purpose of this report is to identify the research and development (R&D) gaps for potential applications of silicon carbide/silicon carbide matrix (SiC/SiC).

Molten Salt Deposit Assisted Corrosion of CMCs and Alloys. Na2SO4 and MgSO4, derived from fuel and the external environment in an engine environment, deposit on both ceramic and metal components.

The Opila research group is working to understand the effects of these deposits on component lifetime. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle.

N.S. Jacobson, J.L. Smialek, D.S. Fox: “Molten Salt Corrosion of SiC and Si3N4”, in Handbook of Ceramics and Composites, ed. by N.P. Cheremisinoff, Vol.

1 Cited by: 4. Corrosion of nitrides, carbides and oxides by simple and complex gases (O 2, H 2 O, SO 2, halides) and melts (ionic and metallic) reveal current measurement and modelling methods, advanced experimental techniques, such as laser diagnostics, TV holography, Raman spectroscopy and NDE surface methods.

Frontier areas (e.g. the modelling of porous. @article{osti_, title = {Molten salt corrosion of hot-pressed Si sub 3 N sub 4 /SiC-reinforced composites and effects of molten salt exposure on slow crack growth of hot-pressed Si sub 3 N sub 4}, author = {Henager, Jr, C H and Jones, R H}, abstractNote = {Corrosion and slow crack growth of hot-pressed Si{sub 3}N{sub 4}- based ceramic materials were studied to.

Effects of silicon carbide on the corrosion of metallic materials in molten LiF-NaF-KF salt. Corrosion ScienceDOI: / Bingwen Long, Zile Wang, Qi Zhang, Wenchang Ke, Yigang Ding. Improved process to prepare high-purity anhydrous potassium fluoride from wet process phosphoric by: @article{osti_, title = {Molten salt corrosion of heat resisting alloys}, author = {Wong-Moreno, A and Salgado, R I.M.

and Martinez, L}, abstractNote = {This paper is devoted to the study of the corrosion behavior of eight high chromium alloys exposed to three different oil ash deposits with V/(Na+S) atomic ratiosandrespectively. Effects of silicon carbide on the corrosion of metallic materials in molten LiF-NaF-KF salt.

Corrosion Science, DOI: / Hongda Wang, Qian Feng, Zhen Wang, Haijun Zhou, Yanmei Kan, Jianbao Hu, Shaoming Dong. Microstructure evolution and high-temperature mechanical properties of SiC f /SiC composites Cited by: This paper reports results concerning the oxidation of silicon carbide of pure SiC powder (98% of SiC) and the oxidation of two silicon carbide castables, used.

Molten Chemical (Flux) Bath Dip Brazing. Dip brazing in molten salt (flux) involves the immersion of an assembly in a bath of molten salt, which provides the heat and may also supply the fluxing action for brazing.

The bath temperature is maintained above the liquidus of the filler metal but below the melting range of the base metal. The papers included in this issue of ECS Transactions were originally presented in the symposium ¿High Temperature Corrosion and Materials Chemistry 8¿, held during the th meeting of The Electrochemical Society, in Vienna, Austria from October 4 to 9, The corrosion protection of Hastelloy-N alloy in LiF-NaF-KF (commonly referred to as FLiNaK) molten salt has been developed by pure Ni and Co coatings using the laser cladding technique.

An immersion experiment with samples was performed in molten FLiNaK salt at °C for h. It was found that the corrosion rates of the pure Ni-coated specimen and the pure Co Cited by: 1. The molten salt systems discussed herein use alloys, such as Hastelloy N andwhich show corrosion resistance to molten salt at nominal operating temperatures up to °C.

These alloys were diffusion welded, and the corresponding information is presented. Test specimens were prepared for exposing diffusion welds to molten salt environments. Hot corrosion behaviour of nickel-based aluminide coatings with different thicknesses of initial Pt plating was evaluated in the Na2SO4/NaCl (, wt./wt.) salt mixture at °C.

Submicron-sized (~ nm) aluminium boron carbide (Al8B4C7) particles were synthesised from Al, B4C and carbon black raw materials in a molten NaCl-based salt at a relatively low temperature. The effects of the salt type/assembly and the firing temperature on the synthesis process were examined, and the relevant reaction mechanisms discussed.

The molten salt Author: Cheng Liu, Xueyin Liu, Zhaoping Hou, Quanli Jia, Benjun Cheng, Shaowei Zhang. Compaction Behavior and Mechanical Characteristics of Ceramic Powders 5. Molten Salt Corrosion of SiC and Si3N4 6.

Dynamic Properties of Epoxy Resins 7. Planar-Random Fiber Composites 8. Modeling Porous Glass Wool Composite Strength 9. Corrosion Phenomena in Glass-Fiber-Reinforced Thermosetting Resins Corrosion and corrosive degradation of ceramics microstructure molten salt molybdenum monoclinic mullite observed occurs oxidation oxidation of SiC oxidation rate oxygen partial pressure pits powder R.

Tressler reaction resistance samples shown in Fig shows Si3N4 ceramics SiC and Si3N4 silica silicon carbide silicon nitride sintered. The molten salt played an important role in the Al 8 B 4 C 7 formation process. By using a combined salt of 95%NaCl + 5%NaF, an effective liquid reaction medium was formed, greatly facilitating the Al 8 B 4 C 7 formation.

As a result, essentially phase-pure Al 8 B 4 C 7 was obtained after 6 h of firing at °C. This temperature was Silicon Carbide Surface Cleaning and Etching V. Jokubavicius, M. Syväjärvi, R. Yakimova. Silicon carbide (SiC) surface cleaning and etching (wet, electrochemical, thermal) are important technological processes in preparation of SiC wafers for crystal growth, defect analysis or.

A molten salt reactor (MSR) is a class of nuclear fission reactor in which the primary nuclear reactor coolant and/or the fuel is a molten salt mixture. MSRs offer multiple advantages over conventional nuclear power plants, although for historical reasons, they have not been deployed. The concept was first established in the s.

Topic Close-up #4. Symposium C High Temperature Corrosion and Materials Chemistry 14 Symposium focus: This symposium will focus on the fundamental thermodynamic and kinetic aspects of high temperature oxidation and corrosion, as well as other chemical reactions involving inorganic materials at high temperatures.

Both theoretical and experimental papers. R.L. Jones and K.H. Stem, New eras in molten salt corrosion research, Air Force Office for Scientific Research, Technical Report,NTIS:AFOSR-TR Google Scholar by: 2.

To address the various shortcomings of a high material cost, energy-intensive temperature conditions and ultra-low efficiency of the conventional boro/carbothermal reduction method for the industrial preparation of ZrB2-SiC powders, a novel molten-salt and microwave-modified boro/carbothermal reduction method (MSM-BCTR) was developed to synthesize ZrB2-SiC Cited by: 1.The corrosion behavior of three austenitic stainless steels was evaluated during thermal cycling in molten salt mixtures consisting of NaNO{sub 3} and KNO{sub 3}.

Corrosion tests were conducted with TypesL and stainless steels for more than hours and thermal cycles at a maximum temperature of C. Corrosion rates were.SiC CMCs will be put into service in commercial aircraft engines in The combustion process in a turbine engine produces a large amount of water vapor along with other particulate matter.

Molten Salt Deposit Assisted Corrosion of CMCs and Alloys.