A5004068390- High-Temperature Coating Behaviors
- Advanced ceramic materials synthesis
- Flame retardant materials and properties
- Advanced materials and composites
- Material Properties and Applications
- Nuclear Materials and Properties
- Nuclear materials and radiation effects
- Tribology and Wear Analysis
- Glass properties and applications
- Metal and Thin Film Mechanics
- Aluminum Alloys Composites Properties
- Catalytic Processes in Materials Science
- Semiconductor materials and devices
- Educational Methods and Analysis
- Recycling and utilization of industrial and municipal waste in materials production
- Educator Training and Historical Pedagogy
- Engineering and Materials Science Studies
- Diamond and Carbon-based Materials Research
- Magnesium Oxide Properties and Applications
- Education Practices and Challenges
- Intermetallics and Advanced Alloy Properties
- Luminescence Properties of Advanced Materials
- Antioxidant Activity and Oxidative Stress
- Advancements in Solid Oxide Fuel Cells
- Materials Engineering and Processing
Forschungszentrum Jülich
2014-2024
National Academy of Medicine
2017
Processing of Gd 2 Zr O 7 by atmospheric plasma spraying ( APS ) is challenging due to the difference in vapor pressure between gadolinia and zirconia. Gadolinia volatilized a greater extent than zirconia coating composition unfavorably deviates from initial stoichiometry. Aiming at stoichiometric coatings, experiments were performed with TriplexPro ™ torch different current levels. Particle diagnostics proved be an effective tool for detection potential degrees evaporation via particle...
During the past decade, gadolinium zirconate (Gd 2 Zr O 7 , GZO ) has attracted interest as an alternative material to partially yttria‐stabilized zirconia ( YSZ for thermal barrier coatings TBC s). Despite well‐known benefits of such lower conductivity and superior temperature capability compared processing via atmospheric plasma spraying APS still remains a challenge. Here, we report on experiments which were performed investigate influence microstructure lifetime / double‐layer s....
Abstract For more than 6 decades, thermal barrier coatings have been used to protect structural parts in both stationary and aviation gas turbines. These allow the use of significant higher operation temperatures hence increased efficiencies. In 1970s, yttria-stabilized zirconia (YSZ) was identified as outstanding material for this application. As major deposition technologies electron beam physical vapor (EB-PVD) atmospheric plasma spraying (APS) established. Although topic is already...
Environmental Barrier Coating systems (EBCs) were thermally cycled in a burner rig test facility. Yb2Si2O7 (YbDS) layer was deposited by air plasma spraying while two suspension sprayed Yb2SiO5 (YbMS) microstructures evaluated duplex (YbDS/YbMS) systems: columnar and segmentation cracked. EBCs underwent 2000 cycles at surface temperature of 1300 °C without signs delamination failure. A porous YbMS formed the base intercolumnar gaps cracks systems, presumably due to reactions with entrapped...
Abstract Gadolinium zirconate (Gd 2 Zr O 7 , GZO) as an advanced thermal barrier coating (TBC) material, has lower conductivity, better phase stability, sintering resistance, and calcium‐magnesium‐alumino‐silicates (CMAS) attack resistance than yttria‐stabilized zirconia (YSZ, 6‐8 wt%) at temperatures above 1200°C. However, the drawbacks of GZO, such low fracture toughness formation deleterious interphases with thermally grown alumina have to be considered for application TBC. Using...
Environmental barrier coatings (EBCs) are essential to protect ceramic matrix composites against water vapor recession in typical gas turbine environments. Both oxide and non-oxide-based (CMCs) need such as they show only a limited stability. As the thermal expansion coefficients quite different between two CMCs, suitable EBC materials for both applications different. In paper examples of EBCs types CMCs presented. case oxide-based strength CMC leads damage surface if standard grit-blasting...
Abstract Environmental barrier coatings (EBCs) are used to shield high-temperature Si-based ceramic matrix composite gas turbine components from the harsh, water vapor-rich operating environment. The success of this application is directly correlated intrinsic tightness or hermeticity EBC volatilization barrier, which typically rare-earth disilicates. For air plasma-sprayed (APS) EBCs, related processing parameters during deposition. In work, effect surface speed and feeding rate on...
Environmental barrier coatings are necessary to protect fibre reinforced ceramics from high recession rates in fast and hot water vapor-containing gases as they typically found the gas sections of turbines. A standard material SiC/SiC composites is atmospherically plasma sprayed (APS) Yb2Si2O7. For this material, it difficult obtain at reasonable substrate temperatures both low porosity crystallinity levels during APS. In paper results prepared by a so-called velocity APS process also more...
Gas turbine components are often operated in harsh conditions, which can lead to severe damage. As it is highly desirable from both an economical and ecological point of view restore these worn areas instead manufacturing new components, repair technologies huge interest for companies supplying maintenance overhaul gas turbines. In this article, two thermal techniques described that be used application: cold spraying (CGS) vacuum plasma (VPS). The CGS process allows the deposition metallic...
From the literature, it is known that due to their glass formation tendency, not possible deposit fully-crystalline silicate coatings when conventional atmospheric plasma spraying (APS) process employed. In APS, rapid quenching of sprayed material on substrate facilitates amorphous formation, which shrinks exposed heat and forms pores and/or cracks. This paper explores feasibility using a high-velocity oxygen-fuel (HVOF) for cost-effective fabrication dense, stoichiometric, crystalline...