Processing and Properties of Silicon Carbide Reinforced Reaction Bonded Silicon Nitride Composites
Abstract
Reaction formed ceramic materials have not approached potential levels of utilization because of historically poor properties and the lack of familiarity by potential users. Research with reaction bonded silicon nitride (RBSN) has shown that reduced processing temperatures and times, high purities, net-shape fabrication, and improved properties can be achieved simultaneously with this class of materials if they are processed carefully by rather conventional techniques. Distinct from conventional high performance ceramics, reaction formed ceramics typically contain relatively high levels of residual porosity. As is true of conventional ceramics, superior properties are feasible with porous ceramics only if the microstructural characteristics of all final phases are precisely controlled; the major difference for the porous ceramics is that the pore structure must be as carefully controlled as is required for the solid phases in a high quality conventional ceramic material.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1992
- Accession Number
- ADA260570
Entities
People
- John S. Haggerty
- Shanti Nair
Organizations
- Massachusetts Institute of Technology