Irradiation-induced length changes of glassy carbon

Gray, W.J.; Morgan, W.C.; Cox, James H.; Woodruff, E.M.

doi:10.1016/0008-6223(72)90048-6

Cited by 14 publications

(3 citation statements)

References 4 publications

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“…3,8 Glass-like carbons are widely used for aerospace, medical, chemical and semiconductor industries. 5,[11][12][13][14][15][16][17][18] which require various physical properties such as low density, closed porosity, thermal stability, impermeability of gases and liquids, and electrical conductivity including glass-like isotropic properties.…”

Section: Introductionmentioning

confidence: 99%

Structural and property changes in glass-like carbons formed by heat treatment and addition of filler

Kim¹,

Kim

Hahm

et al. 2004

Macromol. Res.

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Glass-like carbon precursors shrink significantly during curing and carbonization, which leads to crack formation and bending. Cured furan resin powder and ethanol were added to furan resin to diminish the weight loss, to suppress the shrinkage and bending, and to readily release the gases evolved during polymerization and curing. Curing and carbonization were controlled by pressure and slow heating to avoid damage to the samples. The effect of the filler and ethanol on the fabrication process was examined by measuring the properties of the glass-like carbon, such as the specific gravity, bending strength, electrical resistivity, and microstructural change. The specific gravities of the filler-added glass-like carbons were higher than those of the ethanol-added samples because of the formation of macropores from the vaporization of ethanol during the curing and polymerization processes. Although the ethanol-added glass-like carbons exhibited lower bending strengths after carbonization than did the filler-added samples, the opposite result was observed after aging at 2,600 o C. We found that the macropores created from ethanol were contracted and removed upon heat treatment. The electrical resistivity of the glass-like carbon aged at 2,600 o C was lower than those of the samples carbonized at 1,000 o C. We attribute this phenomenon to the fact that aging at high temperature led to well-developed microstructures, the removal of macropores, and the reduction of the surface area.

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Section: Introductionmentioning

confidence: 99%

Structural and property changes in glass-like carbons formed by heat treatment and addition of filler

Kim¹,

Kim

Hahm

et al. 2004

Macromol. Res.

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show abstract

“…In general, all the diffraction patterns obtained after heat treatment were analogous to the previously reported data. 7,11,13,23 With an increase in heat treatment temperature, the broad (002) and (101) diffraction peak of glass-like carbon gradually shifts to a higher angle side and its peak becomes sharper.…”

Section: Resultsmentioning

confidence: 99%

“…8 The physical properties of the glass-like carbon including low density, chemical inertness, closed porosity, thermal stability, impermeability to gases and liquids, electrical conductivity and glass-like isotropic properties allow its application in the aerospace, medical, mechanical, chemical, semiconductor industries. 5,[8][9][10][11][12][13][14] The apparent density of commercially available glass-like carbons ranges from 1.46-1.50 g/cm 3 (2.27 g/cm 3 for a single crystal graphite) irrespective of heat treatment temperature, indicating the existence of thermally stable closed pores in the matrix. 5,8,15 The microstructure of glass-like carbon contains a significant volume of pores as indicated by its low density.…”

Section: Introductionmentioning

confidence: 99%

Chemical and micro-structural changes in glass-like carbon during high temperature heat treatment

Lim

Kim

et al. 2003

Macromol. Res.

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A glass-like carbon was fabricated using furan resin. The influence of heat treatment temperature during fabrication process on the chemical and micro-structural changes was studied by various analytical and spectroscopic methods including TGA, FT-IR, CHN, TEM and XRD. The chemical resistance properties of the fabricated glasslike carbon were also investigated. It has been found that the heat-treated samples at higher temperature up to 2600 o C in N 2 atmosphere had little weight loss, small amounts of functional groups, and high carbon content. The fabricated glass-like carbons upon heat treatment at 2600 o C showed an amorphous stage without any grain growth and/or reconstruction of structure. The glass-like carbon had much better chemical resistance than the artificial graphite, and exhibited a high chemical resistance due to its low surface areas, minimum impurities, and low graphite crystallites.

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Effects of filler and ethanol on mechanical properties of glass-like carbon

et al. 2003

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The effects of filler and ethanol on the mechanical properties of glass-like carbon were studied. The specific gravities of glass-like carbons with the filler were higher than those of alcohol added glass-like carbons due to the formation of pores and bubbles as the alcohol was vaporized in the curing and polymerization stages. The ethanol added glass-like carbon samples also had lower bending strength than the filler added glasslike carbon samples after carbonization; a contrary result was observed after heat treatment at 2600 °C . This was due to the pores that were made with ethanol which plays the role of pore former during carbonization. The fabricated glass-like carbons are quite brittle material. The shore hardness of the glass-like carbon was observed not to be affected by the addition of filler or ethanol, but increased a lot after carbonization.

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Irradiation-induced length changes of glassy carbon

Cited by 14 publications

References 4 publications

Structural and property changes in glass-like carbons formed by heat treatment and addition of filler

Structural and property changes in glass-like carbons formed by heat treatment and addition of filler

Chemical and micro-structural changes in glass-like carbon during high temperature heat treatment

Effects of filler and ethanol on mechanical properties of glass-like carbon

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