Experimental investigation of the dynamic elastic modulus and vibration damping in MoSi{sub 2}-30%Si{sub 3}N{sub 4} as a function of temperature
The dynamic elastic modulus, E, and vibration damping of molybdenum disilicide (MoSi{sub 2}) with 30% volume addition of silicon nitride (Si{sub 3}N{sub 4}) were measured at varying temperatures using the piezoelectric ultrasonic composite oscillator technique (PUCOT). The value of the elastic modulus of the composite was observed to decrease as temperature, T, was increased. The value of dE/dT of MoSi{sub 2} was determined to be {minus}0.03 GPa/K. The vibration damping of MoSi{sub 2}-30%Si{sub 3}N{sub 4} increased as temperature was increased, with an effective activation energy of 0.076 eV/atom. This was an average over the entire temperature range, but two distinct slopes were observed in the plot of damping versus inverse temperature.
- Research Organization:
- Texas A and M Univ., College Station, TX (US)
- OSTI ID:
- 20023165
- Journal Information:
- Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 1 Vol. 9; ISSN 1059-9495; ISSN JMEPEG
- Country of Publication:
- United States
- Language:
- English
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