Wetting of carbon materials by the eutectic ZrB2-Si-C alloy

Krivoshein, D. A.; Sobol, I. A.; Maurakh, M. A.; Dergunova, V. S.; Petrov, Yu. N.

doi:10.1007/bf00798476

Cited by 2 publications

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“…In the effort of reducing the very high production and maintenance costs of these components, plasma spraying has been investigated as a manufacturing technique to produce near net shape components from UHTC composites: coatings up to 4 mm thick were produced by CAPS (Controlled Atmosphere Plasma Spray), over a wide range of processing pressures, and results are reported in previous works [15][16][17]. Particular attention was focused on ZrB 2 -SiC ceramic composites, positive effects being expected from SiC additions on the oxidation resistance of ZrB 2 , with possible extension of the maximum working temperature in oxidizing environments [18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Ceramic Composites and Thermal Protection Systems for Reusable Re-Entry Vehicles

Valente

Bartuli

Pulci

2006

Advances in Science and Technology

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Next generation of reusable launch vehicles and new hypersonic space vehicle concepts are currently under development, moving from traditional aerodynamic configuration towards slender profiles. Main expected benefits are reduction of drag, enhancement in lift-to-drag ratio and reduction of interferences with radio frequency transmissions during the re-entry. Flexibility in designing sharp profiles is strictly conditioned to the availability of suitable materials and processing technologies, required to fabricate components and surfaces able to withstand higher heat fluxes induced by the new profiles. Advances in the field of CMC's for high temperature structures and TPS are the basis for innovative approaches to the design of future RLV's. Beside baseline solutions, already available and well characterized, as for C/SiC CMC's, ultra high temperature ceramics seem to offer the right chance to fabricate hot structures having the required heat-resistant and load carrying capabilities. This paper deals with technologies based on the use of diboride based CMC's which can be considered promising candidate materials for the fabrication of hot structures of slender bodies, such as nose cap and wing leading edges. Recent experimental results will be presented and discussed.

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Section: Introductionmentioning

confidence: 99%

Ceramic Composites and Thermal Protection Systems for Reusable Re-Entry Vehicles

Valente

Bartuli

Pulci

2006

Advances in Science and Technology

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Rapid spark plasma sintering to produce dense UHTCs reinforced with undamaged carbon fibres

et al. 2017

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HighlightsSpark plasma sintering is an efficient technique for densification of Creinforced ZrB materials.Suitable processing conditions (1800 °C/300 s/60 MPa) minimize reaction at the interface.Controlled fibre/matrix reaction enables fibre pull-out and non-brittle fracture.Uncontrolled heating leads to sample degeneration due to eutectic melting. Short fibre reinforced ceramic composites, based on ZrB with a carbon fibre content of 45 vol%, were produced by ball-milling and rapid Spark Plasma Sintering (SPS) at 1800-2300 °C by varying the holding times. Careful control of the sintering parameters, such as the heating rate, dwell temperature and holding time are required to produce a fully dense matrix and avoid fibre degradation. The sintered materials were characterized in terms of relative density, morphology of the fibres and microstructural features of the matrix. The final residual porosity ranged from 16 to 3 vol%. The carbon fibres maintained their original morphology and the matrix consisted of ZrB , SiC and ZrC phases. In spite of the good adhesion between the fibre surface and the matrix promoted by SPS processing, extensive fibre pull-out was observed in the fracture surfaces of all of the composites sintered at or below 1900 °C. Graphical abstractDownload high-res image (327KB) Download full-size image

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Wetting of carbon materials by the eutectic ZrB2-Si-C alloy

Cited by 2 publications

References 1 publication

Ceramic Composites and Thermal Protection Systems for Reusable Re-Entry Vehicles

Ceramic Composites and Thermal Protection Systems for Reusable Re-Entry Vehicles

Rapid spark plasma sintering to produce dense UHTCs reinforced with undamaged carbon fibres

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