Improvement of the oxidation stability and the mechanical properties of flexible graphite foil by boron oxide impregnation

Savchenko, D.V.; Serdan, A.A.; Morozov, V.A.; Van Tendeloo, G.; Ionov, S.G.

doi:10.1016/s1872-5805(12)60001-8

Cited by 39 publications

(8 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such a large percentage of relative weight gain also means that boron dissociated from boron nitride can make small amounts easier to detect. Boron oxide has traditionally been utilized as a protective layer to increase the oxidation resistance of carbon–carbon composites by restricting active sites and preventing oxygen transport. , Thus, newly forming boron oxide can create a layer surrounding the boron particle, protecting it from further oxidizing and not allowing elemental boron to gain weight fully.…”

Section: Resultsmentioning

confidence: 99%

Extreme Thermal Stability and Dissociation Mechanisms of Purified Boron Nitride Nanotubes: Implications for High-Temperature Nanocomposites

Tank

Reyes

Park

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

A fundamental understanding of the thermal behavior of reinforcement materials is crucial to fully exploit their properties in composites. Boron nitride nanotubes (BNNTs), structural analogues to carbon nanotubes, are a strong candidate for nanofillers in high-temperature composites due to their high thermal stability, oxidation resistance, excellent mechanical properties, and high thermal conductivity. In this paper, samples of high-quality, high-purity BNNTs were tested to thermal failure in an inert atmosphere for the first time up to 2500 °C. A significant fraction of the BNNTs survived temperatures as high as 2200°, and the BNNT samples were completely undamaged at temperatures as high as 1800 °C. Boron nitride (BN) nanopowders were tested identically to perform a comparative study, as hexagonal BN is commonly found in purified BNNT samples. Observed color darkening, significant weight loss, an increased boron atomic level, significant weight gain upon oxidation, the presence of boron oxide compounds in an oxidized sample, and the observed boron clusters at the nanoscale indicate dissociation of B-N bonds in the BNNT sample at 2200 °C. The stability of BNNT structures was observed up to 2000 °C, with local/partial wall dissociation or unzipping, and complete survivability of highly crystalline BNNTs is demonstrated up to 1800 °C. This paper presents the first-ever study on extreme temperature thermal stability of purified BNNTs in an inert atmosphere analogous to manufacturing processes for high-temperature nanocomposites.

show abstract

Section: Resultsmentioning

confidence: 99%

Extreme Thermal Stability and Dissociation Mechanisms of Purified Boron Nitride Nanotubes: Implications for High-Temperature Nanocomposites

Tank

Reyes

Park

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…It is worth noting that the oxidation resistance of the EG obtained was high enough, higher than that of various porous graphites, and can be compared to the expanded graphite coated with SiC (expanded graphite +25 or 100 vol.% silane coupling agent) synthesized in [52], graphite foil obtained from expandable graphite modified with boric acid [53], and boron oxide modified graphite foil reported by Savchenko et al [54].…”

Section: Resultsmentioning

confidence: 76%

Highly Porous Expanded Graphite: Thermal Shock vs. Programmable Heating

et al. 2021

View full text Add to dashboard Cite

Highly porous expanded graphite was synthesized by the programmable heating technique using heating with a constant rate (20 °C/min) from room temperature to 400–700 °C. The samples obtained were analyzed by scanning electron microscopy, energy-dispersive spectroscopy, low-temperature nitrogen adsorption, X-ray photoelectron spectroscopy, Raman spectroscopy, thermogravimetry, and differential scanning calorimetry. A comparison between programmable heating and thermal shock as methods of producing expanded graphite showed efficiency of the first one at a temperature 400 °C, and the surface area reached 699 and 184 m2/g, respectively. The proposed technique made it possible to obtain a relatively higher yield of expanded graphite (78–90%) from intercalated graphite. The experiments showed the advantages of programmable heating in terms of its flexibility and the possibility to manage the textural properties, yield, disorder degree, and bulk density of expanded graphite.

show abstract

“…Cold rolling of thermally expanded graphite [48,49] was used to obtain the graphite foil (GF) (Unichimtek, MSU, Russia). The GF strips (0.8 mm thick and 5 × 0.5 cm in size) were anodized in 0.1 M (NH 4 ) 2 SO 4 electrolyte for 4 min at V = 3.0 V and I = 0.3 A [50].…”

Section: Methodsmentioning

confidence: 99%

Advanced Electrode Coatings Based on Poly-N-Phenylanthranilic Acid Composites with Reduced Graphene Oxide for Supercapacitors

et al. 2023

View full text Add to dashboard Cite

The electrochemical behavior of new electrode materials based on poly-N-phenylanthranilic acid (P-N-PAA) composites with reduced graphene oxide (RGO) was studied for the first time. Two methods of obtaining RGO/P-N-PAA composites were suggested. Hybrid materials were synthesized via in situ oxidative polymerization of N-phenylanthranilic acid (N-PAA) in the presence of graphene oxide (GO) (RGO/P-N-PAA-1), as well as from a P-N-PAA solution in DMF containing GO (RGO/P-N-PAA-2). GO post-reduction in the RGO/P-N-PAA composites was carried out under IR heating. Hybrid electrodes are electroactive layers of RGO/P-N-PAA composites stable suspensions in formic acid (FA) deposited on the glassy carbon (GC) and anodized graphite foil (AGF) surfaces. The roughened surface of the AGF flexible strips provides good adhesion of the electroactive coatings. Specific electrochemical capacitances of AGF-based electrodes depend on the method for the production of electroactive coatings and reach 268, 184, 111 F∙g–1 (RGO/P-N-PAA-1) and 407, 321, 255 F∙g–1 (RGO/P-N-PAA-2.1) at 0.5, 1.5, 3.0 mА·cm–2 in an aprotic electrolyte. Specific weight capacitance values of IR-heated composite coatings decrease as compared to capacitance values of primer coatings and amount to 216, 145, 78 F∙g–1 (RGO/P-N-PAA-1IR) and 377, 291, 200 F∙g–1 (RGO/P-N-PAA-2.1IR). With a decrease in the weight of the applied coating, the specific electrochemical capacitance of the electrodes increases to 752, 524, 329 F∙g–1 (AGF/RGO/P-N-PAA-2.1) and 691, 455, 255 F∙g–1 (AGF/RGO/P-N-PAA-1IR).

show abstract

Improvement of the oxidation stability and the mechanical properties of flexible graphite foil by boron oxide impregnation

Cited by 39 publications

References 28 publications

Extreme Thermal Stability and Dissociation Mechanisms of Purified Boron Nitride Nanotubes: Implications for High-Temperature Nanocomposites

Extreme Thermal Stability and Dissociation Mechanisms of Purified Boron Nitride Nanotubes: Implications for High-Temperature Nanocomposites

Highly Porous Expanded Graphite: Thermal Shock vs. Programmable Heating

Advanced Electrode Coatings Based on Poly-N-Phenylanthranilic Acid Composites with Reduced Graphene Oxide for Supercapacitors

Contact Info

Product

Resources

About