Engineering of CMC Tubular Components

Schmidt, Jens; Scheiffele, Matthias; Krenkel, Walter

doi:10.1002/3527605622.ch126

Cited by 7 publications

(4 citation statements)

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“…In general, the higher the amount of fiber reinforcement in the circumferential direction and the higher the tube's wall thickness, the higher the radial shrinkage impediments which cause local delaminations. Wound C/C‐SiC tubes are therefore limited in their size if a high tightness and a delamination‐free microstructure are required 10 …”

Section: Macroscopic Design Aspectsmentioning

confidence: 99%

Carbon Fiber Reinforced CMC for High‐Performance Structures

Krenkel

2004

Int J Applied Ceramic Tech

211

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The demands in space technology originally played the decisive role in the development of carbon fiber reinforced ceramic matrix composites (CMC). Within the last few years, the properties and the manufacturing methods were consistently improved, so that now the industry in general can share in the profits of this new class of composite materials. The liquid silicon infiltration (LSI) process is regarded as one of the most promising processes for industrial products, especially if the aspect of cost is considered. An overview of the design, manufacture, properties, and applications of C/C‐SiC ceramics, produced with the LSI process, is given in this paper.

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Section: Macroscopic Design Aspectsmentioning

confidence: 99%

Carbon Fiber Reinforced CMC for High‐Performance Structures

Krenkel

2004

Int J Applied Ceramic Tech

211

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“…The mechanical and thermophysical properties of these materials have been verified [8]. The mechanical and thermophysical properties of these materials have been verified [8].…”

Section: Components For New Generation High Temperature Heat Exchangementioning

confidence: 85%

Applications of CMCs Made via the Liquid Silicon Infiltration (LSI) Technique

Kochendörfer

Lützenburger

2001

High Temperature Ceramic Matrix Composites

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IntroductionFibre reinforced ceramics can be defined as composite materials, which on the one hand demonstrate the typical material characteristics of high temperature ceramics, and on the other open up the technical manufacturing possibilities for the construction of large, thin walled, complex structures feasible with polymer based composites. Ceramic matrix composites (CMC) are very promising materials for use in structural applications when one considers their low mass (~ 2 g/cm 3 ), excellent thermal shock stability and strength at high temperatures. Different processing techniques are currently in use for the manufacture of complex shaped CMC components based on a fibre architecture of continuous carbon or silicon carbide fibres. A novel technology to produce CMC structures with lower costs and shorter manufacturing times has been developed at DLR [1]. The Liquid Silicon Infiltration (LSI) process is based on the infiltration of economically manufactured carbon / carbon with molten silicon and leads to so-called C/C-SiC materials. The LSI process allows the fabrication of thin walled, extremely lightweight C/C-SiC structures. It is a three step process starting with carbon fibre reinforced polymer (CFRP) manufacture followed by carbonization and concluding with liquid silicon infiltration. The advantage of the LSI process is that it is a near net shape process without reinfiltration steps. Moreover, the LSI process enables the joining of substructures in-situ. An homogeneous, and therefore strong, joint can be produced by implementing molten silicon as a joining material which reacts with carbon, either from the joining specimen or introduced as a paste to the joining surfaces, to form silicon carbide so the joint is as strong and thermally stable as the basis C/C-SiC material.The typical field of application for CMC lies where metals, or superalloys, due to their insufficient mechanical strength at elevated temperatures, can no longer be considered and encompasses all areas of lightweight construction. Thus, all projects concerning future space transportation systems and hypersonic aircraft foresee the extensive use of these materials, in particular for engine intake flaps, nozzles, thermal protection systems (TPS) or so-called hot, load bearing structures in the wings and fuselage, in order to fulfill the extreme lightweight construction demands. However, if the application is in an oxidising atmosphere carbon burnout of both the fibres and the matrix will start at temperatures as low as 450 °C. For these applications, carbon based CMCs can only be utilised for a limited lifetime. Even oxidation protective coatings will only reduce material degradation rather than to prevent oxidation completely.This paper discusses the LSI process and presents examples of CMC applications. Successful applications for the high temperature regime are space reentry structures. Commercially attractive applications within the medium temperature regime take advantage of the excellent High Temperature Ceramic Matrix Composites....

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“…For sulfuric acid thermal decomposition, the decomposition products are SO 3 , SO 2 , O 2 , and H 2 O, which create an aggressively oxidizing environment. Heat exchanger surfaces exposed to this process stream must be capable of protecting the carbon-fiber matrix from oxidation using coatings, matrix additives, or other approaches, as is being done in the HITHEX project to protect exchanger tubes from high-temperature moist combustion flue gases [2]. For the compact plate heat exchanger geometry envisioned here, processes for applying coatings must be compatible with the limited physical access to the heat exchanger surfaces that exists after assembly of the heat exchanger monolith, or be compatible with final assembly following coating.…”

Section: Sulfur-iodine Process Fluids Performancementioning

confidence: 99%

“…LSI composite heat exchanger with 0.3-m long tubes being developed for hightemperature (950 -1200°C) heat recovery from moist flue gas to indirect highpressure gas power cycles under the EU HITHEX project[2].…”

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confidence: 99%

Advanced CSiC Composites for High-temperature Nuclear Heat Transport with Helium, Molten Salts, and Sulphur-iodine Thermochemical Hydrogen Process Fluids

Peterson¹,

Forsberg

Pickard

2004

Nuclear Science

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This paper discusses the use of liquid-silicon-impregnated (LSI) carbon-carbon composites for the development of compact and inexpensive heat exchangers, piping, vessels and pumps capable of operating in the temperature range of 800 to 1100°C with high-pressure helium, molten fluoride salts, and process fluids for sulfur-iodine thermochemical hydrogen production. LSI composites have several potentially attractive features, including ability to maintain nearly full mechanical strength to temperatures approaching 1400°C, inexpensive and commercially available fabrication materials, and the capability for simple forming, machining and joining of carbon-carbon performs, which permits the fabrication of highly complex component geometries. In the near term, these materials may prove to be attractive for use with a molten-salt intermediate loop for the demonstration of hydrogen production with a gas-cooled high temperature reactor. In the longer term, these materials could be attractive for use with the moltensalt cooled Advanced High Temperature Reactor, molten salt reactors, and fusion power plants.

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Engineering of CMC Tubular Components

Cited by 7 publications

References 0 publications

Carbon Fiber Reinforced CMC for High‐Performance Structures

Carbon Fiber Reinforced CMC for High‐Performance Structures

Applications of CMCs Made via the Liquid Silicon Infiltration (LSI) Technique

Advanced CSiC Composites for High-temperature Nuclear Heat Transport with Helium, Molten Salts, and Sulphur-iodine Thermochemical Hydrogen Process Fluids

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