Gas transport model for chemical vapor infiltration. Topical report

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Description

A node-bond percolation model is presented for the gas permeability and pore surface area of the coarse porosity in woven fiber structures during densification by chemical vapor infiltration (CVI). Model parameters include the number of nodes per unit volume and their spatial distribution, and the node and bond radii and their variability. These parameters relate directly to structural features of the weave. Some uncertainty exists in the proper partition of the porosity between {open_quotes}node{close_quotes} and{open_quote}bond{close_quotes} and between intra-tow and inter-tow, although the total is constrained by the known fiber loading in the structure. Applied to cloth layup preforms the model ... continued below

Physical Description

17 p.

Creation Information

Starr, T.L. May 1, 1995.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 14 times . More information about this report can be viewed below.

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  • Starr, T.L. Georgia Institute of Technology, Atlanta, GA (United States). School of Materials Science and Engineering

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Description

A node-bond percolation model is presented for the gas permeability and pore surface area of the coarse porosity in woven fiber structures during densification by chemical vapor infiltration (CVI). Model parameters include the number of nodes per unit volume and their spatial distribution, and the node and bond radii and their variability. These parameters relate directly to structural features of the weave. Some uncertainty exists in the proper partition of the porosity between {open_quotes}node{close_quotes} and{open_quote}bond{close_quotes} and between intra-tow and inter-tow, although the total is constrained by the known fiber loading in the structure. Applied to cloth layup preforms the model gives good agreement with the limited number of available measurements.

Physical Description

17 p.

Notes

OSTI as DE95012163

Source

  • Other Information: PBD: May 1995

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  • Other: DE95012163
  • Report No.: ORNL/SUB--87-00184/05
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/70781 | External Link
  • Office of Scientific & Technical Information Report Number: 70781
  • Archival Resource Key: ark:/67531/metadc712218

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Creation Date

  • May 1, 1995

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • May 2, 2016, 3:51 p.m.

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Starr, T.L. Gas transport model for chemical vapor infiltration. Topical report, report, May 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc712218/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.