Summary of Research Project Results under JSPS FY2002
"Research for the Future Program"

1.Research Institution Tokyo University of Science
2.University-Industry Cooperative Research Committee 133rd Committee on Microstructures and Functions of Materials
3.Term of Project FY 1998 - FY 2002
4.Project Number 98R13301
5.Title of Project Research and Development of New High Damping Materials Based on Atomistic Design

6.Project Leader
Name Institution,Department Title of Position
Shin, Takeuchi Tokyo University of Science, Faculty of Industrial Science and Technology Professor

7.Core Members

Name Institution,Department Title of Position
Naohiro, Igata The University of Tokyo Emeritus Professor
Katsuhiro, Nishiyama Tokyo University of Science, Research Center Professor
Hajime, Hatano Tokyo University of Science, Faculty of Industrial Science and Technology Professor

8.Summary of Research Results

1. Development of high strength (or high specific-strength) and high damping materials: We have succeeded in developing various high damping materials with a strength of 1GPa or higher than 1GPa. Examples are Ti-Ni-Cu intermetallic compounds, Fe-Cr-Mn steel added by Co and hydrogenated bulk metallic glasses. We have developed high specific-strength material, e.g., for sintered Mg-Cu-Mn alloys.
2. Development of Materials with high damping at high temperatures: We have succeeded in developing new ceramics compounds. An example is sintered oxide ceramics containing superelastic YnbO4, which shows high damping from the room temperature to 800°C. We have succeeded in making C/C composites relatively high damping by an oxidation treatment.
3. New characterization procedures: We have successfully developed for the first time an apparatus of damping capacity measurement at high temperature and under high tensile loading. We have developed a method of characterizing damping properties by use of a supersonic attenuation.
4. Application of new high damping materials to practical purposes: We have tried to apply newly developed high damping materials to about 30 machinery and tools, and many of them are found to be successfully applicable but some are not before improving some other properties than damping.

9.Key Words
(1)Noise and vibration problem   (2)Damping technique   (3)Internal friction
(4)High damping material   (5)High-strength, high-damping material
(6)High-temperature, high-damping material
(7)High damping alloy   (8)Ceramics   (9)Composite material