AASERT Student Research on Non-Oxide Structural Ceramics - Alloy Design for Improved Sinterability and Mechanical Performance.
Abstract
The objective of this research is to design micro structures in non-oxide ceramics to improve their mechanical performance and sinter ability. Silicon nitride and silicon carbide with similarly controlled micro structures and residual stress distribution have been investigated. The grant was initiated in 1996. The AASERT student supported by the grant, Anatoly Rosenflanz, discovered an in-situ toughened a'-SiAlON and a patent was filed. This research has been publicly reported since 1997 and has received broad attention. We have also explored the compositional range over which in-situ toughened a'-SiAlON can be obtained. This essentially encompasses the entire single a'-phase region at the higher temperature. We have made a systematic effort to obtain kinetic data on phase transformation at different compositions since this knowledge is critically important for the precise control of nucleation and growth which dictate the microstructure. We have shown that the mechanical strength of a'-SiAlON can exceed 1 GPa and the strength retention is good at least up to 1350 degrees . We have lastly reported phase relations in melilite-containing silicon nitride and their properties, as well as a series of super plastic silicon nitride.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1998
- Accession Number
- ADA377615
Entities
People
- I-wei Chen
Organizations
- University of Michigan