Damping characteristics of CVI-densified carbon–carbon composites

Wang, Can; Zhang, Zhengang; Hou, Xianghui; Li, Hejun

doi:10.1016/s0008-6223(00)00014-2

Cited by 27 publications

(7 citation statements)

References 6 publications

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“…When the corrosion proceeds for 10 h, the Q −1 has already reduced by about 50%. The drastic change is believed to originate from the weakness of interfacial sliding, which causes the energy to be dissipated 12–18,21,24,25 …”

Section: Resultsmentioning

confidence: 99%

“…In theory, IF is closely related to microstructural change on the materials because it is induced by some irreversible structural transformation in solid. Most researches on IF of CMCs have focused on its generation mechanisms 12–19 . Studies on the relationships between thermomechanical damage and IF of CMCs have also been reported 20,21 .…”

Section: Introductionmentioning

confidence: 99%

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Internal Friction Behavior of C/SiC Composites with Environmental Barrier Coatings in Corrosive Environment

Zhou

Cheng

Zhang

et al. 2010

Int J Applied Ceramic Tech

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Internal friction (IF, Q À1 ) behavior of C/SiC composites that were coated with two kinds of environment barrier coatings, scandium disilicate (Sc 2 Si 2 O 7 ) and barium aluminosilicates (BaAl 2 Si 2 O 8 , BAS), were investigated in corrosive environments. The Sc 2 Si 2 O 7 -coated C/SiC composites were subjected to 50%H 2 O-50%O 2 water vapor at 14001C and BAS-coated C/SiC composites were exposed to molten Na 2 SO 4 coupled with 50%H 2 O-50%O 2 water vapor at 9001C. The values of Q À1 for the samples corroded at different times were recorded by means of a forced nonresonant technique. The weight loss and flexural strength as a function of corrosion time were measured. The microstructural evolution of the corroded specimens at different periods was also studied. The results indicate that the value of Q À1 of the coated C/SiC composites varies with their corrosion behaviors. The main factors that determine the IF behavior of the composites subjected to corrosion environments are the oxidation and corrosion of their fibers and interface.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Internal Friction Behavior of C/SiC Composites with Environmental Barrier Coatings in Corrosive Environment

Zhou

Cheng

Zhang

et al. 2010

Int J Applied Ceramic Tech

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Section: ■ Introductionmentioning

confidence: 99%

“…The induced strain energy in a composite material subjected to dynamic loading is absorbed through a variety of damping mechanisms. Regardless of the viscoelastic nature of polymer matrix, which is the main contributing factor in energy dissipation, the interphase region − and damaged area can affect the damping behavior of composites. Recently, it was shown that assembled carbon nanotube (CNT) forests on carbon fiber increase the damping coefficient of continuous fiber reinforced polymer (CFRP) composites by 514% whereas dispersed CNTs show only 53% enhancement. − In nanocomposites, it is postulated that the improved damping response relies on increasing the friction area at the interface between the CNTs and matrix phase. − Nevertheless, the damping performance of dispersed CNTs within the matrix phase of a polymer based composite is compromised by complex fabrication processes and reduction in stiffness .…”

Section: Introductionmentioning

confidence: 99%

Morphology-Controlled ZnO Nanowire Arrays for Tailored Hybrid Composites with High Damping

Malakooti

Hwang

Sodano

2014

ACS Appl. Mater. Interfaces

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Hybrid fiber reinforced composites using a nanoscale reinforcement of the interface have not reached their optimal performance in practical applications due to their complex design and the challenging assembly of their multiscale components. One promising approach to the fabrication of hybrid composites is the growth of zinc oxide (ZnO) nanowire arrays on the surface of carbon fibers to provide improved interfacial strength and out of plane reinforcement. However, this approach has been demonstrated mainly on fibers and thus still requires complex processing conditions. Here we demonstrate a simple approach to the fabrication of such composites through the growth of the nanowires on the fabric. The fabricated composites with nanostructured graded interphase not only exhibit remarkable damping enhancement but also stiffness improvement. It is demonstrated that these two extremely important properties of the composite can be controlled by tuning the morphology of the ZnO nanowires at the interface. Higher damping and flexural rigidity of these composites over traditional ones offer practical high-performance composites.

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“…Carbon fiber reinforced ceramic matrix composites are promising for applications requiring not only high strength, high fracture toughness, and low specific weight but also at ultrahigh temperatures , . More recently, fabricating silicon-containing CMCs from polysilanes, polysiloxanes, polycarbosilanes, and polysilazanes, the so-called polymer-derived ceramics (PDCs), has gained interest because of the advantages of their low processing temperatures, controllable ceramic compositions and neat-net-shapes .…”

Section: Introductionmentioning

confidence: 99%

SiCO-doped Carbon Fibers with Unique Dual Superhydrophilicity/Superoleophilicity and Ductile and Capacitance Properties

Lü

Huang

Mukherjee

et al. 2010

ACS Appl. Mater. Interfaces

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Silicon oxycarbide (SiCO) glass-doped carbon fibers with an average diameter of 163 nm were successfully synthesized by electrospinning polymer mixtures of preceramic precursor polyureasilazane (PUS) and carbon precursor polyacrylonitrile (PAN) into fibers then converting to ceramic/carbon hybrid via cross-linking, stabilization, and pyrolysis at temperatures up to 1000 °C. The transformation of PUS/PAN polymer precursors to SiCO/carbon structures was confirmed by EDS and FTIR. Both carbon and SiCO/carbon fibers were amorphous and slightly oxidized. Doping with SiCO enhanced the thermal stability of carbon fibers and acquired new ductile behavior in the SiCO/carbon fibers with significantly improved flexibility and breaking elongation. Furthermore, the SiCO/carbon fibers exhibited dual superhydrophilicity and superoleophilicity with water and decane absorbing capacities of 873 and 608%, respectively. The cyclic voltammetry also showed that SiCO/carbon composite fibers possess better capacitor properties than carbon fibers.

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Damping characteristics of CVI-densified carbon–carbon composites

Cited by 27 publications

References 6 publications

Internal Friction Behavior of C/SiC Composites with Environmental Barrier Coatings in Corrosive Environment

Internal Friction Behavior of C/SiC Composites with Environmental Barrier Coatings in Corrosive Environment

Morphology-Controlled ZnO Nanowire Arrays for Tailored Hybrid Composites with High Damping

SiCO-doped Carbon Fibers with Unique Dual Superhydrophilicity/Superoleophilicity and Ductile and Capacitance Properties

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