Graphite foil-incorporated PAN/Pitch/Phenolic-derived carbon/carbon composite and preliminary hermetic sealing test in molten fluoride salt

Hsun Yu Lin, Kuo Jung Lee, Jiin Huey Chern Lin, Chien Ping Ju

研究成果: Article

摘要

C/C composite has been recommended for use in molten fluoride salt-cooled reactors as structural containment for the highly corrosive salts in heat exchangers, piping, pumps, etc. Despite their excellent high-Temperature mechanical properties and chemical compatibility with molten fluoride salts, the inherently high porosity level of C/C composites is one major challenge to the material for such applications. The numerous inherent and/or high temperature heat treatment-induced macrocracks and microcracks in C/C composites are difficult to seal completely using conventional methods such as CVD or CVI. To overcome the porosity-related molten salt permeation problem, a graphite foil-incorporated PAN fiber, a pitch/phenolic resin matrix-derived C/C composite, was developed in the authors' laboratory. Experimental results showed that the C/C composite with the graphite foil had lower density value, higher porosity value, and lower bending strength value than the C/C composite without the graphite foil. A preliminary result of the hermetic sealing test in a molten mixture of LiF, NaF and KF salts ("Flinak" salt) showed that the graphite foil could effectively seal the underlying C/C composite against permeation from high temperature molten salts. Furthermore, given appropriate process parameters, the graphite foil could remain tightly bonded to the C/C structure during the entire fabrication process and the subsequent bending and hermetic sealing tests.

原文English
頁(從 - 到)1313-1318
頁數6
期刊Materials Transactions
58
發行號9
DOIs
出版狀態Published - 2017 一月 1

指紋

carbon-carbon composites
Carbon carbon composites
polyacrylonitrile
Graphite
sealing
Fluorides
Metal foil
fluorides
Molten materials
foils
graphite
Salts
salts
composite materials
Composite materials
Porosity
molten salts
porosity
Permeation
Seals

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

引用此文

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title = "Graphite foil-incorporated PAN/Pitch/Phenolic-derived carbon/carbon composite and preliminary hermetic sealing test in molten fluoride salt",
abstract = "C/C composite has been recommended for use in molten fluoride salt-cooled reactors as structural containment for the highly corrosive salts in heat exchangers, piping, pumps, etc. Despite their excellent high-Temperature mechanical properties and chemical compatibility with molten fluoride salts, the inherently high porosity level of C/C composites is one major challenge to the material for such applications. The numerous inherent and/or high temperature heat treatment-induced macrocracks and microcracks in C/C composites are difficult to seal completely using conventional methods such as CVD or CVI. To overcome the porosity-related molten salt permeation problem, a graphite foil-incorporated PAN fiber, a pitch/phenolic resin matrix-derived C/C composite, was developed in the authors' laboratory. Experimental results showed that the C/C composite with the graphite foil had lower density value, higher porosity value, and lower bending strength value than the C/C composite without the graphite foil. A preliminary result of the hermetic sealing test in a molten mixture of LiF, NaF and KF salts ({"}Flinak{"} salt) showed that the graphite foil could effectively seal the underlying C/C composite against permeation from high temperature molten salts. Furthermore, given appropriate process parameters, the graphite foil could remain tightly bonded to the C/C structure during the entire fabrication process and the subsequent bending and hermetic sealing tests.",
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Graphite foil-incorporated PAN/Pitch/Phenolic-derived carbon/carbon composite and preliminary hermetic sealing test in molten fluoride salt. / Lin, Hsun Yu; Lee, Kuo Jung; Lin, Jiin Huey Chern; Ju, Chien Ping.

於: Materials Transactions, 卷 58, 編號 9, 01.01.2017, p. 1313-1318.

研究成果: Article

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AB - C/C composite has been recommended for use in molten fluoride salt-cooled reactors as structural containment for the highly corrosive salts in heat exchangers, piping, pumps, etc. Despite their excellent high-Temperature mechanical properties and chemical compatibility with molten fluoride salts, the inherently high porosity level of C/C composites is one major challenge to the material for such applications. The numerous inherent and/or high temperature heat treatment-induced macrocracks and microcracks in C/C composites are difficult to seal completely using conventional methods such as CVD or CVI. To overcome the porosity-related molten salt permeation problem, a graphite foil-incorporated PAN fiber, a pitch/phenolic resin matrix-derived C/C composite, was developed in the authors' laboratory. Experimental results showed that the C/C composite with the graphite foil had lower density value, higher porosity value, and lower bending strength value than the C/C composite without the graphite foil. A preliminary result of the hermetic sealing test in a molten mixture of LiF, NaF and KF salts ("Flinak" salt) showed that the graphite foil could effectively seal the underlying C/C composite against permeation from high temperature molten salts. Furthermore, given appropriate process parameters, the graphite foil could remain tightly bonded to the C/C structure during the entire fabrication process and the subsequent bending and hermetic sealing tests.

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