Volume 18, Issue 2 (April 1996)

    Hot Pressing of Plasma-Sprayed SiC Fiber-Reinforced Ti-6Al-4V Alloy


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    Advanced titanium alloy metal matrix composites offer significant mechanical improvements over many conventional materials. In order to minimize fiber-matrix chemical reactions due to high temperatures involved in the fabrication methods, the final component can be obtained using two different steps: (1) fabrication of preforms (monotapes) by inert plasma spraying and (2) hot pressing of the fabricated preforms.

    Continuous SiC fiber-reinforced Ti-6Al-4V preforms were hot pressed to fabricate a composite multilayer. Different values of hot pressing processing parameters (temperature, applied load, bonding time) were investigated on the basis of a two-level factorial design. Metallographic and scanning electron microscopy (SEM) analyses were carried out to evaluate the bonding degree of the fabricated preforms. Preliminary three-point bending tests were also performed to understand the mechanical behavior and to show the more suitable values of the processing parameters for a hot pressing procedure. These values should be in the range of 830 to 950°C (temperature), 80 MPa (applied stress), 20 to 30 min bonding time to avoid undesired phase transformation, large plastic flow of the metal matrix, and detrimental chemical reaction at fiber-matrix interface.

    Author Information:

    Carassiti, F
    Associate professor, Third University of Rome, Rome,

    Valente, T
    Research engineer, Rome University “La Sapienza,”, Rome,

    Stock #: CTR10519J

    ISSN: 0884-6804

    DOI: 10.1520/CTR10519J

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    Title Hot Pressing of Plasma-Sprayed SiC Fiber-Reinforced Ti-6Al-4V Alloy
    Symposium , 0000-00-00
    Committee D30