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  • COMPOSITE MATERIALS  (4)
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  • 1
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    CVD-produced boron filaments (1980)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A technique for producing boron filaments with an average tensile strength of 6.89 GPa has been developed which involves longitudinal splitting of the filament and core (substrate) removal by etching. Splitting is accomplished by a pinch wheel device which continuously splits filaments in lengths of 3.0 m by applying a force to the side of the filament to create a crack which is then propagated along the axis by a gentle sliding action. To facilitate the splitting, a single 10 mil tungsten substrate is used instead of the usual 0.5 mil substrate. A solution of hot 30% hydrogen peroxide is used to remove the core without attacking the boron. An alternative technique is to alter the residual stress by heavily etching the filament. Average strengths in the 4.83-5.52 GPa range have been obtained by etching an 8 mil filament to 4 mil.
    Keywords: COMPOSITE MATERIALS
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    NASA TECHNICAL REPORTS
  • 2
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    Microstructure and mechanical properties of high temperature aluminum composites (1989)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Keywords: COMPOSITE MATERIALS
    Type: Symposium on High Temperature Composites; Jun 13, 1989 - Jun 15, 1989; Dayton, OH; United States
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    NASA TECHNICAL REPORTS
  • 3
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    Investigation of reaction kinetics and interfacial phase formation in Ti3Al + Nb composites (1992)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Titanium aluminide metal matrix composites are prominent materials systems being considered for high temperature aerospace applications. One of the major problems with this material is the reactivity between existing reinforcements and the matrix after prolonged thermal exposure. This paper presents results from an investigation of reaction kinetics between Ti-14Al-21Nb (wt pct) and SCS-6 fibers and SiC fibers with surface coatings of TiB2, TiC, TiN, W, and Si. Microstructural evaluation of the reaction layers as well as matrix regions around the fibers is presented.
    Keywords: COMPOSITE MATERIALS
    Type: SAMPE Quarterly (ISSN 0036-0821); 23; 13-19
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    NASA TECHNICAL REPORTS
  • 4
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    Interfacial reaction kinetics of coated SiC fibers with various titanium alloys (1991)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The kinetics of the reaction between the silicon carbide fibers and the titanium-based alloy matrix was investigated at temperatures from 800 to 1000 C for several titanium-based alloys (including Ti-1100 alloy and BETA 21S) and unalloyed Ti, reinforced with coated silicon carbide fiber SCS-6. The reaction zone growth kinetics was studied by exposing vacuum encapsulated samples to temperatures from 700 to 1000 C for times up to 150 hrs, followed by SAM observations of samples which were polished perpendicular to the fiber axis and etched. It was found that the reaction zone growth kinetics of the alpha (hcp) and beta (bcc) phases of unalloyed titanium reacting with SCS-6 fibers exhibited different values of the apparent activation energy and of the preexponential factor. Additions of other metals to Ti was found to slow down the reaction kinetics. Among the alloys studied, the Ti-1100 was the slowest reacting conventional alloy and the Ti-14Al-21Nb (in wt pct) was the slowest overall.
    Keywords: COMPOSITE MATERIALS
    Type: Scripta Metallurgica et Materialia (ISSN 0956-716X); 25; 437-441
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    NASA TECHNICAL REPORTS
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