Kombinierte PIRAC und CVD Oxidationsschutzbeschichtungen auf C/C‐SiC

Maile, Karl; Gotman, Irina; Gutmanas, E.Y.; Yin, Xiaowei; Lyutovich, A.; Berreth, Karl; Weiß, Roland

doi:10.1002/9783527609017.ch45

Cited by 3 publications

(3 citation statements)

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“…With regard to technical application and impact the concept was used for the improvement of ceramic matrix composites (C/C-SiC) especially for the use in the high temperature area. The following effects have been achieved: -Crack-sealing [1], -Improvement of the mechanical properties obtained by using the ion-mixing effect [5,9]. -A wide range of application is expected -e.g.…”

Section: Discussionmentioning

confidence: 99%

Functionally Graded Coatings of Carbon Reinforced Carbon by Physical and Chemical Vapour Deposition (PVD and CVD)

Maile

Berreth²,

Lyutovich³

2005

MSF

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This paper reflects our R&D results in the field of functionally graded coating processes. For industrial applications a special architecture for coatings is necessary: because the surface has to withstand environmental attacks, specific physical and mechanical functions and characteristics are required. In the interface region to the substrate additional stresses and strains occur due to the different materials combined. Consequently, the coatings have to be chemically and mechanically adjusted to the substrates. For this challenging problem, a concept named Materials Adapter has been developed within the frame of different research programs at MPA. For optimisation of the interface region an ion bombardment-activated inter-diffusion process ("ion mixing") was employed by using ion assisted electron beam PVD (IA EB PVD). Several Cr, Ti, Al and Zr coatings have been produced. An automated precursor inlet has been installed for CVD processes to obtain preset composition profiles for graded systems. Especially multilayer stacks of PyC-SixCy-SiC-Si3N4-Al2O3 have been deposited in a single growth process. The structure and composition of the coatings and interfaces were investigated by XRD, AFM, SEM, EDX, EPMA, ESCA and the micro-Raman spectroscopy. The characterisation confirms the gradual transition between Si and Cr, as well as between Cr and Al deposited by IA EB PVD and between C and Si grown by CVD.

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Section: Discussionmentioning

confidence: 99%

Functionally Graded Coatings of Carbon Reinforced Carbon by Physical and Chemical Vapour Deposition (PVD and CVD)

Maile

Berreth²,

Lyutovich³

2005

MSF

Self Cite

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“…The architecture of the coating should be a ductile material coherent with the tube material, showing improved oxidation resistance. The thickness of the diffusion coating with elevated Si content can be controlled by the process time [12]. The plastic deformation capability of the ferritic layer with lower hardness is better than that of the martensitic tube material.…”

Section: Methodsmentioning

confidence: 99%

Silicon surface treatment via CVD of inner steel tube surfaces

Berreth

Maile

Lyutovich

2005

Materials and Corrosion

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Inner surfaces of steel tubes should be protected against corrosion and oxidation by a coating in order to assure optimised application in power plants and the chemical industry. Since the silicon content in chromium alloyed steels improves the oxidation protection. Chemical vapour deposition (CVD) of Si has been investigated for martensitic 9% chromium steel (T91). The surface treatment was performed as a combined process of CVD at atmospheric pressure with heat treatment in a chemical atmosphere with high frequency heating (HF), automated with a Simatic PCS7. The Si out of SiCI 4 diffused into the steel lattice of the substrate surface. As a result, the Si-content near the surface layer increased as a ferrite layer which did not transform to martensite during heat treatment. The excess of Si was converted to Si 3 N 4 using NH 3 . This improves the anti-oxidation behaviour. The physical and chemical properties of the modified surfaces were investigated and characterised using the SEM, EDX, electron microprobe and X-ray diffraction methods. The deformation capacity of a coated specimen was proven by means of hot tensile tests. It could be determined that in the ferritic layer Fe is substituted by Si with a maximum concentration of approx. 5%, however the Cr content was almost constant.

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“…In order to overcome the limitations of thick-walled piping for highly efficient and flexible power plants a composite system based on a highly creep resistant CMC (Ceramic Matrix Composite) was developed by a joint team from industry and research and was patented in Ref. [15]. In a previous project [16] the concept has shown superior creep strength and allowed for an increase in lifetime of hollow cylinder specimen with a filament wound jacket by the factor of about six.…”

Section: Conceptmentioning

confidence: 99%

CMC-Jacketed Piping for High-Temperature Applications: Concept, Laboratory Tests and Large-Scale Application Test

Friedrich

Huang

Jüngert

et al. 2019

KEM

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The increasing market share of highly volatile electricity generated from renewable sources like wind or solar energy, leads to enormous challenges in the energy sector. Since large-scale storage systems are neither currently nor in the near future available, the gap between electricity from renewable sources and current electricity demand has to be closed with flexibly operated conventional power plants. In order to be a viable, cost-effective option in tomorrow’s energy market future power plants must be highly efficient while having low CO2 emissions. Furthermore, they have to be highly reactive to counter instabilities in the electrical grid due to fluctuations in renewable sources. Current materials used in power plants are only within limits suited to experience extreme changes in operational loads. However, extreme changes of operational loads will become increasingly severe with a growing share of renewables. Our project team has developed a new concept for CMC-jacketed pipes to alleviate these issues. Recently, this concept was further developed and tested in laboratory as well as a large-scale application test at Grosskraftwerk Mannheim (GKM). All tests are still ongoing. Additionally, to the use in modern highly efficient power plants such CMC-jacketed piping is also suitable for other high-temperature applications, like e.g. solar power plants or industrial chemical applications.

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Kombinierte PIRAC und CVD Oxidationsschutzbeschichtungen auf C/C‐SiC

Cited by 3 publications

References 0 publications

Functionally Graded Coatings of Carbon Reinforced Carbon by Physical and Chemical Vapour Deposition (PVD and CVD)

Functionally Graded Coatings of Carbon Reinforced Carbon by Physical and Chemical Vapour Deposition (PVD and CVD)

Silicon surface treatment via CVD of inner steel tube surfaces

CMC-Jacketed Piping for High-Temperature Applications: Concept, Laboratory Tests and Large-Scale Application Test

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