article - ceramic coatings for htr graphite structures - tests and

High Temperature Coatings for Oxidation and Erosion

Modern approaches to the creation of single-layer and multi-layer high-temperature coatings for the protection of heat-resistant carbon-containing composite materials from oxidation and erosion in the high-speed fluxes of oxygen-containing gases are analyzed.

Open Access Full Text Article ORIGINAL RESEARCH

For ceramic coatings, hydroxyapatite (HA) has been demonstrated to be a reliable and an effective material because of its similarity with the mineral phase of natural bone tissue.15 Numerous methods are available for preparation of HA coat

Microstructure, properties and applications of Zr

Zirconium-based coatings have found important uses ranging from functional deposits on carbon fibers, field emitters, nuclear fuel particles, and dental and body implants to protective layers on tool bits, roller contacts, integrated circuits, and components exposed to

Ceramic coatings for protection against frictional wear and

1990/5/2Nuclear Engineering and Design 119 (1990) 447-457 447 North-Holland CERAMIC COATINGS FOR PROTECTION AGAINST FRICTIONAL WEAR AND DIFFUSION WELDING IN HTR HELIUM W. THEYMANN, R. ENGEL and H. DEMUS Hochtemperatur Reaktorbau

Shaping of ceramic parts by selective laser melting of

Nevertheless, several researches are focused on the fabrication of ceramic coatings or monolithic parts by laser processes. Reference Bourell, Marcus, Barlow and Beaman 1 – Reference Wu, Du, Choy and Hench 9 One of the primary challenges is to perform SLS or melting in two dimensions (on coatings or powder beds) which is a prerequisite to build up 3D ceramic parts.

Sensitivity and Uncertainty Analysis of the Maximum Fuel

The maximum fuel temperature under accident condition is the most important parameter of inherently safe characteristics of HTR-PM, and the DLOFC accident may lead to a peak accident fuel temperature. And there are a variety of uncertainty sources in the

Microstructure, properties and applications of Zr

Zirconium-based coatings have found important uses ranging from functional deposits on carbon fibers, field emitters, nuclear fuel particles, and dental and body implants to protective layers on tool bits, roller contacts, integrated circuits, and components exposed to

Studies of White Ceramic Coatings for ESA's BepiColombo

2019/5/17Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.

Wettability, Photoactivity, and Antimicrobial Activity of

Self-cleaning coatings are advanced materials for the removal of pollutants and microorganisms by combining wettability, photocatalytic degradation, and antimicrobial activity. In this work, we propose a rational design of self-cleaning films based on TiO 2 synthesized by sol–gel on commercial glazed ceramic tiles for building's indoor applications.

Studies of White Ceramic Coatings for ESA's BepiColombo

2019/5/17Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.

Ceramic composites: A review of toughening mechanisms

This is likely a result of irradiation induced microstructural changes within the turbostatic graphite-like structures. Reference Karthik, Kane, Butt, Windes and Ubic 76, Reference Karthik, Kane, Butt, Windes and Ubic 77 For thought, consider a perfect graphite lattice for which shear failure occurs at the weakly bound basal planes.

Advances in Abradable Coatings for Gas Turbines

These coatings are necessary to provide very small clearances between the rotating and stationary parts in order to minimize gap losses and so Increase efficiency. The relatively few abradable coating materials developed over the last 20 years still perform well in many blade tip seal and labyrinth seal applications.

Micro

2021/4/12Tailor et al. [] used X-ray diffraction to analyze the residual stresses of thick metallic and ceramic coatings fabricated by thermal spray technologies. Using penetrating high-energy synchrotron X-rays and thermal neutrons, Venter et al. found that the residual stresses associated with an HVOF thermal spray coating of WC–Co on two different substrate materials were less than 250 MPa [ 19 ].

Springer

2009/10/15Invar alloy (Fe-36%Ni) is used in industrial applications that require high dimensional stability because of its exceptionally low thermal expansion coefficient. The purpose of this work is to improve the wear resistance of the molds in the production of carbon-fiber reinforced plastic (CFRP) components applying thermal spray coatings. Four different kinds of commercial powders were

SiC/SiO2 Coating on Matrix Graphite Spheres of HTR Fuel

Abstract: Graphite is one of the most important material for the reactor core and fuel elements of high temperature gas-cooled reactor (HTR). [4] Dong Z J, Liu S X, Li X K, et al. Influence of infiltration temperature on the microstructure and oxidation behavior of SiC–ZrC ceramic coating on C/C composites prepared by reactive melt infiltration [J].

Comparison of irradiation behaviour of HTR graphite

2017/8/15Large HTR graphite irradiation program results are reported. • Irradiation and measurement quality allows comparison of graphite grades. • Coarse grain grades appears favourable over fine grain grades for HTR applications. • Graphite irradiation behaviour could not be

Graphite as a structural material in HTR plants

1990/4/1Graphite has been selected as a structural material in HTR plants because of its favourable characteristics. The low ductility and the low tensile strength of this material as well as its behaviour under the impact of fast neutron irradiation require special construction directives and design criteria.

Boron carbide

article{osti_10179978, title = {Boron carbide-based coatings on graphite for plasma facing components}, author = {Valentine, P G and Trester, P W and Winter, J and Linke, J and Duwe, R and Wallura, E and Philipps, V}, abstractNote = {In the effort to evaluate boron-rich coatings as plasma facing surfaces in fusion devices, a new process for applying boron carbide (B{sub 4}C) coatings to

Cold

Cold spray is a solid-state coating deposition technology developed in the 1980s. In comparison with conventional thermal spray processes, cold spray can retain the original properties of feedstock, prevent the adverse influence on the underlying substrate materials, and produce very thick coatings. Coatings with nanostructure offer the potential for significant improvements in physical and

Structure and Properties of Nanostructured (Ti

Nanostructured coatings of (Ti-Zr-Hf-V-Nb)N were obtained by the Cathodic Arc Vapor Deposition (CAVD) method. To investigate these coatings, a number of complementary methods of elemental and structural analysis were used, namely, slow positron beam

Ceramic materials testing and modeling (Technical

article{osti_674999, title = {Ceramic materials testing and modeling}, author = {Wilfinger, K. R., LLNL}, abstractNote = {Certain refractory ceramics (notably oxides) have desirable properties suitable for the construction of ceramic waste containers for long term use in nuclear waste disposal applications.

Relationship between Al2O3 Content and Wear Behavior of

In this study, the microstructure and wear behaviours of aluminium composites, reinforced with different amounts of (3-12%) Al 2 O 3 and 2% (% vol.) graphite were investigated. The Al 2 O 3 and graphite were added to Al matrix and mechanically alloyed for 60 minutes. Subsequently, the mechanically alloyed powders were pressed under 700MPa pressure and sintered at 600 ∘ C for 120 minutes. The

In Vitro Biocompatibility of Si Alloyed Multi

2016/8/29As resulted from the XPS analysis, the surface composition of the coatings consists of a mixture of metallic carbide, free-carbon (graphite-like) and oxides phases. The formation of surface oxides has been often reported for coatings based on transition metal compounds [ 49 – 51 ], being the result of the oxidation process during sample exposure in free atmosphere.

Silver Nanoparticle/Graphene Oxide/Chitosan Coatings

Also, the passive region in the GO/CS and AgNPs/GO/CS coatings after immersion for 3 h in universal buffer solution are larger than that of the bare ceramic. The electrochemical parameters such as corrosion potential ( E corr ) and corrosion current density ( i corr ) were obtained by extrapolation of the Tafel curves, and the protection efficiency is calculated by the following equation [ 49

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