Strong and ultra-flexible polymer-derived silicon carbonitride nanocomposites by aligned carbon nanotubes

Yang, Jinshan; Downes, Rebekah; Yu, Zhibin; Park, Jin Gyu; Liang, Richard; Xu, Chengying

doi:10.1016/j.ceramint.2016.05.078

Cited by 15 publications

(7 citation statements)

References 46 publications

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“…Polymer‐derived ceramics (PDCs) are class of ceramics that can be synthesized by direct thermal decomposition of liquid, melt, or organic solution polymeric precursors 11‐13 . Different from conventional ceramics, properties of PDCs can be tuned by tailoring the chemical composition upon heat treatment 14‐16 . PDCs are known to possess good oxidation resistance and creep resistance at high temperatures 16 .…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of polymer‐derived ceramic reinforced with boron nitride nanotubes

Jia

Ajayi

2020

J Am Ceram Soc

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The electrical and dielectric properties of boron nitride nanotubes (BNNTs) reinforced ceramic composites using the polymer‐derived ceramic (PDC) processing route were investigated in this work. The electrical resistivity of the pristine PDC increases from 106 to 108 Ω m after the addition of BNNTs. When the BNNT loading was increased to 5 wt%, the average real relative permittivity of the PDC decreased from 2.94 to 2.80, while the quality factor (Q) of the PDC increased from 134.40 to 176.77. The BNNTs can increase the Q factor of the PDC due to the reduction in the porosity cause by the introduction of the BNNTs. Further increasing the BNNT content decreases the real relative permittivity of the nanocomposites and increases the Q factor at high frequency. The average real relative permittivity decreases to 2.29, while the average Q factor increases to 208.60 when the BNNT content is increased to 30 wt%. The dielectric loss after the addition of high fraction of BNNTs can be explained by the Lorentz resonance relaxation process. Results of this work showed that PDC‐BNNT nanocomposites are satisfactory electromagnetic transparent materials when the BNNT fraction is less than 10 wt%.

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Section: Introductionmentioning

confidence: 99%

Dielectric properties of polymer‐derived ceramic reinforced with boron nitride nanotubes

Jia

Ajayi

2020

J Am Ceram Soc

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“…The pullout length of SiCNWs is related to the energy dissipation during the process of SiCNWs pullout and debonding, which is beneficial to the composite toughening, as shown in the following equations (Equations and ):

G_{pullout} = \frac{V L^{2} τ}{r}

G_{debond} = \frac{2 V L T}{r},

where V is the nanowire volume fraction of 20%, L is the pullout length of SiCNWs and r is the nanowire radius of 40 nm; τ is the interfacial shear stress and can be obtained from literatures (10 MPa) and T is an estimated value usually set as 4 J/m 2 for glass matrix materials . The SiCNWs/SiC composites with PyC interphase show G pullout and G debond of 40.5 and 36 J/m 2 comparing to the one of 0.72 and 4.8 J/m 2 without the PyC interphase.…”

Section: Resultsmentioning

confidence: 99%

“…Little pull-outs exist on the fracture surface of SiCNWs/SiC composites without PyC interphase. As long as PyC interphase is applied to optimize the bonding condition between SiCNWs and SiC The pullout length of SiCNWs is related to the energy dissipation during the process of SiCNWs pullout and debonding, which is beneficial to the composite toughening, as shown in the following equations (Equations 1 and 2) 15 :…”

Section: Resultsmentioning

confidence: 99%

Interfacial optimization of SiC nanocomposites reinforced by SiC nanowires with high volume fraction

et al. 2019

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High volume fraction SiC nanowires‐reinforced SiC composites (SiCNWs/SiC) were prepared by hybrid process of chemical vapor infiltration and polymer impregnation/pyrolysis in this research. SiCNWs networks are first to be made promising a high volume fraction (20 vol%), and the pyrolytic carbon (PyC) interphase with 5 nm is designed on SiCNWs surface to optimize the bonding condition between SiCNWs and SiC matrix. Nanoindentation shows a modulus of 494 ± 14 GPa of SiCNWs/SiC composites without interphase comparing to the one with PyC interphase of 452 ± 13 GPa. However, the 3‐point bending test shows a higher strength of the composite with PyC interphase (273 ± 32 MPa) comparing with the one without interphase (240 ± 38 MPa). The fracture surface is observed under SEM, which shows a longer SiCNWs pullout of the composite with PyC interphase. The energy dissipation during the 3‐point bending test is calculated by the length of nanowire pull‐out, it demonstrates that the SiCNWs with PyC interphase possess better performance for toughening composite. Further characterization proves that the PyC interphase can give SiCNWs/SiC composites higher fracture toughness (4.49 ± 0.44 MPa·m1/2) than the composites without interphase (3.66 ± 0.28 MPa·m1/2).

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“…These two effects have a negative impact on the thermal conductivity of PDCs. However, BNNTs have a high thermal conductivity of 200 W•(m•K) −1 [77], and the positive impact on the thermal conductivity of PDCs far exceeds the negative impact caused by micropores and interfaces. Therefore, the thermal conductivity of PDCs increases with the increase of BNNTs content.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Polymer-Derived Si-Based Ceramics: Recent Developments and Perspectives

et al. 2020

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Polymer derived ceramics (PDCs) are promising candidates for usages as the functionalization of inorganic Si-based materials. Compared with traditional ceramics preparation methods, it is easier to prepare and functionalize ceramics with complex shapes by using the PDCs technique, thereby broadening the application fields of inorganic Si-based ceramics. In this article, we summarized the research progress and the trends of PDCs in recent years, especially most recent three years. Fabrication techniques (traditional preparation, 3D printing, template method, freezing casting techniques, etc.), microstructural tailoring mainly via additive doping, and properties (mechanical, thermal, electrical, as well as dielectric and electromagnetic wave absorption properties) of Si-based PDCs were explicated. Meanwhile, challenges and perspectives for PDCs techniques were proposed as well, with the purpose to enlighten multiple functionalized applications of polymer-derived Si-based ceramics.

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Strong and ultra-flexible polymer-derived silicon carbonitride nanocomposites by aligned carbon nanotubes

Cited by 15 publications

References 46 publications

Dielectric properties of polymer‐derived ceramic reinforced with boron nitride nanotubes

Dielectric properties of polymer‐derived ceramic reinforced with boron nitride nanotubes

Interfacial optimization of SiC nanocomposites reinforced by SiC nanowires with high volume fraction

Polymer-Derived Si-Based Ceramics: Recent Developments and Perspectives

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