Flexible graphite sheet with decreased anisotropy
First Claim
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1. Flexible graphite sheet formed by compressing a blended mixture of relatively large particles of intercalated, exfoliated, expanded natural graphite at least 80% by weight sized 20×
- 50 mesh prior to exfoliation and expansion with smaller particles of intercalated, exfoliated, expanded particles of natural graphite at least 80% by weight sized 50×
100 mesh prior to exfoliation and expansion, the smaller particles being present in the amount of 25 to 75% by weight, characterized by having increased electrical conductivity through the thickness of the sheet as compared to a flexible graphite sheet formed only from relatively large particles of intercalated, exfoliated, expanded natural graphite.
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Abstract
Flexible graphite sheet is made by compressing a mixture of relatively large particles of intercalated, exfoliated, expanded natural graphite with smaller particles of intercalated, exfoliated expanded, expanded particles of natural graphite. The resulting sheet of flexible graphite exhibits increased electrical conductivity through the thickness (“c” direction) of the sheet and improved sealability perpendicular to the “c” direction.
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Citations
1 Claim
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1. Flexible graphite sheet formed by compressing a blended mixture of relatively large particles of intercalated, exfoliated, expanded natural graphite at least 80% by weight sized 20×
- 50 mesh prior to exfoliation and expansion with smaller particles of intercalated, exfoliated, expanded particles of natural graphite at least 80% by weight sized 50×
100 mesh prior to exfoliation and expansion, the smaller particles being present in the amount of 25 to 75% by weight, characterized by having increased electrical conductivity through the thickness of the sheet as compared to a flexible graphite sheet formed only from relatively large particles of intercalated, exfoliated, expanded natural graphite.
- 50 mesh prior to exfoliation and expansion with smaller particles of intercalated, exfoliated, expanded particles of natural graphite at least 80% by weight sized 50×
Specification
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Current AssigneeUCAR Graph-Tech Incorporated
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Original AssigneeGraftech, Incorporated
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InventorsMercuri, Robert Angelo
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Primary Examiner(s)Kuhns, Allan R.
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Application NumberUS09/133,237Time in Patent Office1,055 DaysField of Search428/372, 428/402, 428/408, 264/122, 264/321, 423/448, 423/460US Class Current428/408CPC Class CodesC04B 35/536 based on expanded graphite ...F16J 15/3496 use of special materialsH01M 8/0213 Gas-impermeable carbon-cont...Y02E 60/50 Fuel cellsY10T 428/2982 Particulate matter [e.g., s...Y10T 428/30 Self-sustaining carbon mass...
