Effects of pressure and temperature on hot pressing a sialonThe combined effects of temperature and pressure on the resulting density of a sialon (i.e., a ceramic composed of Si, Al, O, and N) are evaluated. Pressures in the 3.5-27.5 MPa range and temperatures in the 1550-1750 C range are considered. It is found that: (1) fully dense sialon bodies may be produced at lower temperatures than those usually used in the field, (2) the phase equilibrium reaction is increased by increased pressure, (3) the iso-density contour may be used to help design the desired microstructure, (4) phase changes occurring in the sample during hot pressing influenced sialon densification to a large extent, and (5) microstructures exceeding 98% theoretical density suggest that plastic deformation has contributed to densification.
Document ID
19790027535
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Yeh, H. C. (NASA Lewis Research Center Cleveland, OH, United States)
Waters, W. J. (NASA Lewis Research Center Cleveland, Ohio, United States)