Accession Number:

ADA275396

Title:

Dynamic Response of Ceramics

Descriptive Note:

Final rept. 1 May 1992-31 Oct 1993

Corporate Author:

CALIFORNIA INST OF TECH PASADENA SEISMOLOGICAL LAB

Report Date:

1993-12-31

Pagination or Media Count:

29.0

Abstract:

Both solid to gas CaSO4 SiO yields SiO3 S02 and Si3N4 3C diamond and 3SiC 2 N2 can be shock-induced at ballistic velocities. Because of the endothermic nature of the gas-producing reactions, the extent of reactions observed are limited to interfaces. We found the above reactions proceed to a much less extent than calculation by equilibrium thermodynamic calculations. Reaction products are found to be 0.01 times those calculated for equilibrium. We show that the extent of reaction, rather than limited by the usual diffusion processes appears to be controlled by dynamic mixing processes arising from Rayleigh-Taylor instabilities at, for example, CaSiO4-SiO2 interfaces. We apply a theory developed by Drucker 1 to account for the observed extent of reaction. Gas-producing reactions, Shock chemistry, Rayleigh-Taylor instabilities.

Subject Categories:

  • Physical Chemistry
  • Ballistics
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE