Rapid vapor-phase densification of refractory composites

Golecki, I.

doi:10.1016/s0927-796x(97)00003-x

Cited by 119 publications

(63 citation statements)

References 39 publications

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“…The density of C/C composite is 1.71 g cm À3 after fast infiltration for 5 h. Compared to isothermal CVI, [1] the densification rate is two orders of magnitude larger. A homogeneous rough laminar (RL) deposit is obtained along the thickness direction of densified Fe-deposited fibers according to the comprehensive studies of pyrocarbon by Pierson and Lieberman.…”

Section: Characteristics and Mechanical Properties Of Cnfsreinforced mentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

“…[1,2] However, two major drawbacks with C/C composites are inadequate interlaminar shear strength (ILSS) causing delamination and a very long processing period. [1,3] In order to improve ILSS of C/C composites, ''whiskerization'' processes have been investigated in which carbon filaments were grown on the surface of CFs (CFs) via catalytic CVD or catalytic chemical vapor infiltration (CVI). [3][4][5][6][7] The combination of a microscale fibrous preform with a nanometer-scale reinforcement could improve the interfacial strength between matrix and fiber, [4,8] which is a crucial parameter controlling the load transfer.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and Characteristics of Carbon Nanofiber‐Reinforced Carbon/Carbon Composites by Fast Catalytic Infiltration Processes

Zhang

Luo

et al. 2009

Chemical Vapor Deposition

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The simultaneous in-situ growth of carbon nanofibers (CNFs) and densification of a CNFs/CF hybrid multiscale felt are accomplished in a single step by thermal gradient chemical vapor infiltration using Fe as the catalyst and vaporized kerosene under atmospheric pressure. A three-dimensional CNF network which could bridge dissimilar components of composites is formed on carbon fibers (CFs). The length of CNFs can reach several micrometers and the diameters are about 80 nm. Smooth and rough surface densified CNFs can be produced after further higher temperature infiltration. CNFs, anchoring to CFs by the adherence of the catalyst nanoparticles, enhance the bonding between CFs and pyrocarbon as well as promoting the formation of a rough laminar pyrocarbon matrix. The deposition mechanisms and physical model are also discussed. This fast catalytic infiltration process can be applied to other ceramic materials and has significant enlargement potential.

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Section: Characteristics and Mechanical Properties Of Cnfsreinforced mentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication and Characteristics of Carbon Nanofiber‐Reinforced Carbon/Carbon Composites by Fast Catalytic Infiltration Processes

Zhang

Luo

et al. 2009

Chemical Vapor Deposition

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“…After multiple heat treatments and densification processes a lightweight, yet mechanically stable composite is produced which is almost entirely composed of carbon. The bonding and densification can be achieved by the aid of different processes and precursor materials [2]. Such processes include chemical vapour deposition (CVD) or chemical vapour infiltration (CVI) [2].…”

Section: Introductionmentioning

confidence: 99%

SEM and EDS investigation of a pyrolytic carbon covered C/C composite maxillofacial implant retrieved from the human body after 8 years

Sebők

Kiss

Szabó

et al. 2012

J Mater Sci: Mater Med

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The long term effect of the human body on a pyrolytic carbon covered C/C composite maxillofacial implant (CarBulat(Tm)) was investigated by comparing the structure, the surface morphology and composition of an implant retrieved after 8 years to a sterilized, but not implanted one. Although the thickness of the carbon fibres constituting the implants did not change during the 8 year period, the surface of the implant retrieved was covered with a thin surface layer not present on the unimplanted implant. The composition of this layer is identical to the composition of the underlying carbon fibres. Calcium can only be detected on the surface as a trace element implying that the new layer is not formed by bone tissue. Residual soft tissue penetrating the bulk material between the carbon fibre bunches was found on the retrieved implant indicating the importance of the surface morphology in tissue growth and adhering to implants.

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“…These preforms were densified using both resin and/or chemical vapor infiltration (CVI). Several resin systems were employed, as well as different CVI precursors and processing conditions [4]. Annealing was performed in the temperature range 1800-3000°C.…”

Section: Materials Methods and Resultsmentioning

confidence: 99%

Properties of high thermal conductivity carbon-carbon composites for thermal management applications

Golecki

Xue²,

Leung³

et al.

1998 High-Temperature Electronic Materials, Devices and Sensors Conference (Cat. No.98EX132)

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Rapid vapor-phase densification of refractory composites

Cited by 119 publications

References 39 publications

Fabrication and Characteristics of Carbon Nanofiber‐Reinforced Carbon/Carbon Composites by Fast Catalytic Infiltration Processes

Fabrication and Characteristics of Carbon Nanofiber‐Reinforced Carbon/Carbon Composites by Fast Catalytic Infiltration Processes

SEM and EDS investigation of a pyrolytic carbon covered C/C composite maxillofacial implant retrieved from the human body after 8 years

Properties of high thermal conductivity carbon-carbon composites for thermal management applications

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