High Temperature Materials Laboratory (Keizo Hashimoto Laboratory)

In our laboratory, we are conducting research on lightweight heat-resistant materials such as Ni-based superalloys, Ti alloys, titanium aluminide intermetallic compounds and their composite materials, and research in the space field of meteor observation. As a specialized subject, he is in charge of "materials science", "aerospace material properties", "aerospace combustion engineering", "material strength science", "composite material engineering", and "space science" in the undergraduate school, and "combustion" in the Graduate School. I am in charge of "Engineering" and "Materials and Structural Strength Science". We are conducting cutting-edge research on new materials in cooperation with domestic and overseas research institutes on advanced materials used in aircraft and spacecraft. In my graduation research, I am instructed to acquire advanced process technology and material analysis technology and to summarize the research results on my own. We also actively announce research results.

Development of SiC fiber reinforced titanium-aluminum intermetallic compound composite material
We have been conducting research for many years on titanium-aluminum intermetallic compounds, which have begun to be applied to jet engines as lightweight heat-resistant materials. We are conducting cutting-edge research in material design of titanium-aluminum intermetallic compounds, high-temperature strength, and high-temperature oxidation. Currently, we are working on the development of composite technology between titanium-aluminum intermetallic compounds and SiC fibers. Titanium aluminum foil material and SiC fiber are laminated and composited at a high temperature of 1200 to 1300 ° C using a hot press. A reaction occurs between the titanium aluminide and the SiC fiber, reducing the strength of the composite. We are conducting detailed analysis of the structure of the reaction layer using a scanning electron microscope and an X-ray diffractometer.

Observation of microstructural changes in Ni-based superalloys by non-destructive inspection (X-ray diffraction)
Comparison of the structure of the part exposed to high temperature and the part cooled from the Ni-based superalloy turbine blade used in the real environment, and the comparison with the diffraction image obtained non-destructively by the curved IPX-ray diffractometer. to hold. We aim to establish non-destructive inspection technology by clarifying the correspondence between X-ray diffraction spots and internal tissues.

Elucidation of the lubrication mechanism of WS2, a solid lubricant for spacecraft
Basically, the use of lubricant is indispensable for spacecraft that cannot be maintained after launch, and the selected lubricant may affect the life of the spacecraft. In addition, the economic loss due to a single failure is a non-negligible level in a spacecraft that requires enormous cost for development, and research and development of lubricants related to the reliability of the spacecraft are in an extremely important position. Molybdenum disulfide has been put into practical use as a solid lubricant for space, but we have evaluated the wear characteristics of tungsten disulfide, which has the same crystal structure, in the space environment and explored its potential as a solid lubricant for high temperatures. To do. We will analyze using XRD and SEM to elucidate the mechanism of superlubricity.

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Introduction of Keizo Hashimoto