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High Performance Synthetic Fibers for Composites (1992) / Chapter Skim
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4 Important Issues in Fiber Science/Technology
Pages 103-108

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
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From page 103...
... In both polymer-matrix and metal-matrix composites produced by casting, the ability of the matrix to 'wet out" on the fiber can be determined by the fiber surface. Well-known examples of this include the epoxy-compatible "sizings" applied to carbon and glass fibers and the Ti-B surface preparation of carbon fibers in preparation for aluminum and magnesium metal infiltration.
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From page 104...
... Thus, with CMCs the region between fiber and matrix must exhibit sufficient strength to transfer load and be weak enough to divert cracks. SUMMARY OF TECHNICAL ISSUES Progress in high-performance synthetic fibers of all types demands greater emphasis on fundamental research directed at four interdependent technical issues: · Fiber-formation processes and mechanisms.
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From page 105...
... These factors, encompassing the scientific and engineering fundamentals underlying fiber preparation and property evaluation, can have a major impact on the rate of progress and success of fiber research efforts. Attention is required to the following technical issues concerning fiber characteristics and fiber-formation processes.
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From page 106...
... The type of bonding required at the fiber-matrix interface will often dictate the characteristics that must be designed into the fiber surface. In addition, surface coating layers may be required to enhance the fiber strength, to act as a diffusion barrier preventing chemical attack by the matrix, or to accommodate any thermal expansion coefficient mismatch between fiber and matrix.
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From page 107...
... Sturcture and composition of Sic fiber produced by Chemical Vapor Deposition. Carbon Layer Carbide / Layer -Fiber FIGURE 4.2.
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From page 108...
... A systematic approach needs to be developed, starting from the known properties of bulk material, to identify and select candidate materials for fiber development. This approach should incorporate early consideration of the matrix and potential fiber-matrix interactions during processing as well as in the service life and environment of the final composite.
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Key Terms

  • fiber strength
  • fiber surface
  • synthetic fibers
  • interphase region
  • chemical vapor

  • vapor deposition
  • reinforcing fiber
  • fiber reinforced
  • surface preparation
  • matrix composites

  • crack propagation
  • systematic approach
  • bulk material
  • fiber produced
  • following technical

  • normally involves
  • chemical equilibrium
  • comprise relatively
  • fiber test
  • chemical attack

  • ensure compatibility
  • initial fiber
  • direct comparison
  • coefficient mismatch
  • physical property

  • prenotched region
  • metal matrix
  • types demands
  • identify fiber
  • diameters frequently


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