Brittle Materials Design, High Temperature Gas Turbine. Ceramic Turbine Rotor Technology
Abstract
This report contains progress during the last six months and a summary of earlier progress on the DOE supported programs within the joint DARPA/DOE 'Brittle Materials Design, High Temperature Gas Turbine' Program and constitutes the final report of work under DOE funds. A separate report will cover the progress on the DARPA supported Ceramic Turbine Testing Program. The summary of previous work supported by DOE includes progress on reaction bonded and hot pressed silicon nitride materials technology. Several NDE techniques were considered for the detection of flaws in complex-shaped silicon nitride components. Improvements to the hot press bonding process resulted in a significant improvement in the yield of flaw-free hot press bonded rotors. M.O. R. and cold spin tests of rotor blade rings revealed the presence of undetected subsurface flaws in both the blades and the rim. Blade bend testing indicated that blade strength degraded during hot press bonding. During this reporting period, an investigation of hot press bonding temperatures and time at temperature defined a region of zero microstructural and strength degradation. This study involved 19 hot press bondings from which curves were generated defining the changes in color, porosity, hardness, phase and strength as a function of time and temperature.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1979
- Accession Number
- ADA067176
Entities
People
- Arthur F. Mclean
- Robert R. Baker
Organizations
- Ford Motor Company