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  • 1
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    Plasma Enhanced Microwave Joining (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: A new method for plasma enhanced microwave joining of high purity (99.8%) alumina has been developed. The controlled application of a plasma between the adjoining surfaces of two rods initially heats the microwave-low-absorbing alumina rods to temperatures high enough for them to absorb microwave energy efficiently. With this technology, the adjacent surfaces of alumina rods can be melted and welded together in less than three minutes using approximately 400 watts of microwave energy. Four point bending tests measured fracture strengths of up to 130 MPa at the joined interface. Optical and SEM micrographs indicated that exaggerated grain growth prevailed for all joints studied.
    Keywords: Mechanical Engineering
    Type: Ceramic Transactions; Volume 56; 265-272
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Vibration Method for Tracking the Resonant Mode and Impedance of a Microwave Cavity (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: A vibration technique his been developed to continuously maintain mode resonance and impedance much between a constant frequency magnetron source and resonant cavity. This method uses a vibrating metal rod to modulate the volume of the cavity in a manner equivalent to modulating an adjustable plunger. A similar vibrating metal rod attached to a stub tuner modulates the waveguide volume between the source and cavity. A phase sensitive detection scheme determines the optimum position of the adjustable plunger and stub turner during processing. The improved power transfer during the heating of a 99.8% pure alumina rod was demonstrated using this new technique. Temperature-time and reflected power-time heating curves are presented for the cases of no tracking, impedance tracker only, mode tracker only and simultaneous impedance and mode tracking. Controlled internal melting of an alumina rod near 2000 C using both tracking units was also demonstrated.
    Keywords: Electronics and Electrical Engineering
    Type: Ceramic Transactions; Volume 59; 167-174
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Conventional and Microwave Joining of Silicon Carbide Using Displacement Reactions (1995)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: Microwave heating was used to join Silicon Carbide rods using a thin TiC /Si tape interlayer . Microwaves quickly heated the rods and tape to temperatures where solid-state displacement reactions between TiC and Si occurred.
    Type: American Ceramic Society meeting on Advanced Ceramic Processing; Indianapolis, IN; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    (abstract) Microwave Induced Combustion Synthesis of Ceramic and Ceramic-Metal Composites (1995)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: We have used microwaves to induce self-propagating high temperature synthesis (SHS) in the reaction 3TiO(sub 2)+3C+(4+x)Al ---〉 3TiC+2Al(sub 2)O(sub 3)+xAl. The SHS process was studied for x = 0 and 4, with and without the application of uniaxial pressure. A TE102 microwave cavity mode internally ignited the samples using less than 50 watts. The resultant microstructure of the microwave processed samples were compared to SHS products obtained using a conventional hot wire ignition technique. Uniaxial stresses along the vertical axis of approximately 1400 and 200 psi were applied simultaneously as the SHS reactions were initiated in some of the conventional and microwave processed samples, respectively. SEM photomicrographs will be presented that show the different microstructural features of the products using the microwave and hot wire techniques.
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Microwave Induced Combustion Synthesis of Ceramic and Ceramic-Metal Composites (1995)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: In recent years, there has been a renewed interest in combustion synthesis reactions, commonly called self-propagating high-temperature synthesis. These reactions are an attractive, energy efficient approach to the synthesis of high temperature composite materials and metastable phases. Microwaves are used to induce self-propagating high temperature synthesis of ceramic and ceramic-metal composites.
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Functionally Graded Material Prepared by Microwave Induced Combustion Synthesis (1996)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Type: American Ceramic Society, 1996 Annual Meeting and Exposition; Indianapolis, IN; United States
    Format: text
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    NASA TECHNICAL REPORTS
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