Low density, three-dimensionally interconnected carbon nanotube/silicon carbide nanocomposites for thermal protection applications

Polymer based materials with high conductivity and electric insulation are widely used in new electronic fields as thermal interface material (TIM). In this work, firstly we prepared the mixed fillers of silicon carbide (SiC) and carbon nanotubes (CNT), and then used them to modify silicone rubber (SR) preparing composite SR. The experimental results of TGA showed that the composite silicone rubber had strong thermal stability, and the mass loss was only 5% until about 370°C. Besides, the thermal conductivity was significantly enhanced, which increased from 0.2 (pure SR) to 1.103 W·m−1·k−1 (composite SR containing 3wt%CNT and 20wt%SiC), the enhancement ratio arriving as high as 483.05%. In addition, the composite silicone rubber maintained (water contact angle above 90 °) hydrophobicity and electrical insulation (volume resistivity of composite SR with 3wt%CNT and 20wt%SiC up to 1013 Ω·cm), which effectively prevent leakage risk and reduce voltage loss. Therefore, a small number of mixed fillers of SiC and CNT can effectively improve the combination properties of silicone rubber and provide more ideas for TIM.

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“…200), (220), and (311), respectively. [46,47] The peak labeled (S.F.) was due to internal defects formed during SiC whisker growth.…”

Section: Microstructuresmentioning

confidence: 99%

High conductivity thermoelectric insulation composite silicone rubber prepared by carbon nanotubes and silicon carbide composite filler

Cao

Tong

et al. 2022

Polymer Composites

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“…The PyC deposition on the CNT array fragments resulted in thickening the CNT struts and encapsulating the CNT-CNT junctions with PyC. [19,20] This effectively created physical crosslinks between the CNTs within the fragments' structure and built a threedimensional interconnected network of aligned CNTs. Further, the PyC infiltration was deemed essential to impart foamy properties to the coated CNT array fragments and provide a collective restoring force to reverse compressive strains.…”

Section: Pyc Coating Of Cnt Array Fragmentsmentioning

confidence: 99%

“…Further, the PyC infiltration was deemed essential to impart foamy properties to the coated CNT array fragments and provide a collective restoring force to reverse compressive strains. [19,20] The PyC coated samples were labeled and referred to as CNTF_pristine, CNTF_40 and CNTF_120 respectively.…”

Section: Pyc Coating Of Cnt Array Fragmentsmentioning

confidence: 99%

One‐step fabrication of bulk nanocomposites reinforced by carbon nanotube array fragments

2021

Self Cite

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Vertically aligned carbon nanotube (VACNT) array growth is an established process where high aspect ratio carbon nanotubes (CNTs) are produced. This work demonstrates one-step approach to fabricate bulk polymer nanocomposites using CNT array fragments'. Here, 4.5 mm long CNTs were collected post VACNTs synthesis. Next, CNT array fragments were coated with pyrolytic carbon (PyC) and infused with polydimethylsiloxane (PDMS) matrix to create porous CNT/PDMS nanocomposite with a CNT weight fraction of 20%. Achieving similar weight fraction with super long bundled CNTs using dispersion techniques is extremely difficult. The compression and dynamic mechanical behaviors and piezoresistive response of the PDMS filled nanocomposite were assessed. The results revealed the potential of the synthesized structure to serve as fatigue-resistant pressure sensors with high damping and self-sensing capabilities. The proposed fabrication technique is versatile, as it can work with thermosetting and thermoplastic polymers in addition to allowing for mass production of PDMS filled nanocomposites.

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“…Earlier published works mostly used computational models (Snoeys and Van Dijck [5]; Van Dijck and Dutre [6]; Beck [7,8]; Jilani and Pandey [9,10]; Erden and Kaftanoglu [11]; Lhiaubet and Meyer [12]; Lhiaubet et al [13]; Pandey and Jilani [14]; Dibitonto et al [1]; Patel et al [15]). These models allowed prediction of the temperature distribution chart, material removal rate (MRR), and shape of the crater on the machined workpiece.…”

Section: Introductionmentioning

confidence: 99%

“…At the end of the discharge, the crater's morphology and volume is determined using the isothermal curve that separates the liquid and solid portions of the workpiece material. SiC/CNT has an excellent electrical and thermal conductivity due to which it can be used as electrode support for electrochemical energy devices as Polymer Electrolyte Membrane Fuel Cells on Li-ion battery [14,15]. Yeo et al [16] conducted a thorough analysis and review of prior models, and they were found to be inconsistent with experimental findings.…”

Section: Introductionmentioning

confidence: 99%

Thermal Modelling and Multi Decision Making Optimization of EDM of Non Conductive SiC-CNT Ceramic Composite Used for Li-ion Battery and Sensor

Chaudhury¹,

Samantaray²

2021

JNMES

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In this research work the thermal modeling of a nonconductive Silicon carbide Ceramic matrix composite (CMC) machined by Die Sinking Electric Discharge Machining (EDM) has been done. Though SiC is a non-conductive material but the presence of CNT makes it a conductive material which can be machined with EDM. The modeling procedure carried out by considering some realistic approach like Gaussian heat Flux, Specific Discharge Energy, Variable Latent heat etc. For this analysis a 2D continuum has been designed as work domain. By simulating the work domain model by a Finite Element Analysis (FEA) Software (COMSOL), material removal rate (MRR) has been estimated with variable thermal properties. Parametric analysis of effect of Variable Specific heat on MRR by considering different current, Voltage and Pulse-On time has been performed. The effect of different input parameters (peak current and Pulse-on time) on Crater geometry has been done. A new concept of Specific discharge energy has been introduced during modelling to make it a more realistic model which can also be used as electrode support for electrochemical energy devices as Polymer Electrolyte Membrane Fuel Cells on Li-ion battery. Desirability analysis has been done to get an optimize set of input parameters for I= 3A, V=30V, Ton= 75 µs for machining ceramic matrix composite by EDM. The optimized MRR at this setting is 7.25 mm3/min whereas PFE is 87%. The experimental analysis has been also performed to strengthen the thermal and mathematical modelling.

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Low density, three-dimensionally interconnected carbon nanotube/silicon carbide nanocomposites for thermal protection applications

Cited by 30 publications

References 60 publications

High conductivity thermoelectric insulation composite silicone rubber prepared by carbon nanotubes and silicon carbide composite filler

High conductivity thermoelectric insulation composite silicone rubber prepared by carbon nanotubes and silicon carbide composite filler

One‐step fabrication of bulk nanocomposites reinforced by carbon nanotube array fragments

Thermal Modelling and Multi Decision Making Optimization of EDM of Non Conductive SiC-CNT Ceramic Composite Used for Li-ion Battery and Sensor

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