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Compositing Mechanisms Lab
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The lab studies how to strengthen metallic materials such as titanium by making them composites.
AboutAbout the lab
Compositing materials to bring out their functions
The lab (Kondo Lab) studies how to strengthen metallic materials such as titanium through powder sintering, metal 3D printing, and compositing with carbon nanotubes.
It examines the inside of materials broadly, from atomic-scale calculations to analysis of joint interfaces between dissimilar materials and evaluation of corrosion and friction and wear.
The lab is a division of the Joining and Welding Research Institute, Osaka University, and participates in the graduate school as a cooperating division of the Department of Mechanical Engineering, Graduate School of Engineering.
The lab's page introduces equipment for making and examining materials, such as heat treatment equipment and electron microscopes.
Key terms
- Solid solution strengthening
- A strengthening method in which atoms of another element are dissolved into a metal crystal to make it harder to deform
- Sintering
- A method of compacting powder and heating it so that the particles bond into a solid mass without melting
- First-principles calculation
- A method that calculates the properties of materials at the atomic level from the fundamental laws of quantum mechanics
- CNT
- Short for carbon nanotube. A very thin material in which carbon atoms are connected in a tube shape
NewsLab news
A master's student received the Excellent Presentation Award at the Spring Meeting of the Japan Society of Powder and Powder Metallurgy
A doctoral student received the Graduate Student Research Encouragement Award from the Society of Automotive Engineers of Japan
A master's student's paper was published in the Journal of the Japan Society of Powder and Powder Metallurgy
A master's student's paper was published in Materials Transactions
A doctoral student's paper was published in the Journal of Alloys and Compounds
ResearchResearch themes
The lab works on creating materials with enhanced strength by combining metals such as titanium with atoms such as oxygen and nitrogen, metal powders, and carbon nanotubes. In addition to experiments, it uses first-principles calculations to predict the behavior of atoms, aiming to build models that predict strength.
*Illustrative imageHigher strength and ductility in sintered titanium
By dissolving oxygen and nitrogen atoms in the α-Ti phase and promoting the thermal decomposition of oxides and nitrides during sintering, the lab aims for higher strength through a combination of mechanisms such as solid solution strengthening. It also examines designs that control the ratio of crystal lattice constants to suppress the loss of ductility.
*Illustrative imageMetal 3D printing of titanium and higher strength and toughness
When laser-melted metal powder solidifies rapidly, it produces non-equilibrium microstructures, ultrafine structures and supersaturated solid solutions. The lab uses these to improve mechanical properties and is advancing new alloy design and process development.
*Illustrative imageCarbon nanotube-metal composites
To make use of the excellent mechanical, thermal and electrical properties of CNTs in metallic materials, the lab makes composites by a monodispersion method. It analyzes the interface structure between the CNTs and the matrix and the synthesis behavior of carbon-based nanocompounds, clarifies the strengthening mechanisms, and applies them to materials design.
*Illustrative imageAtomic-scale strength prediction by computational science
The lab uses first-principles calculations to predict the structural stability of solute (solid solution) atoms in metal crystals, building a comprehensive understanding of the atomic behavior involved in solid solution strengthening. By comparing the results with experiments, it aims to build strength prediction models.
MembersFaculty
The members of Kondo Lab consist of professors, visiting professors, visiting researchers, lecturers, assistant professors, project researchers, and doctoral, master's and undergraduate students.As of 2026
- ProfessorKatsuyoshi Kondo
- ProfessorJunko Umeda
- LecturerShota Kariya
- Assistant ProfessorAmarda Issariyapat
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Composite 3d” PerOX / Public domain (cropped)
- Higher strength and ductility in sintered titanium: “Titanium powder 3N” Leiem / CC BY-SA 4.0 (cropped)
- Metal 3D printing of titanium and higher strength and toughness: “JPL 3D-Printed Part Springs Forward (PIA26706 figA)” Proteus Space / Public domain (cropped)
- Carbon nanotube-metal composites: “Types of Carbon Nanotubes” User Mstroeck on en.wikipedia / CC BY-SA 3.0 (cropped)
- Atomic-scale strength prediction by computational science: “Atomic structure model of fcc CoCrFeMnNi” Shaoqing Wang / CC BY 3.0 (cropped)
- Related lab (溶接機構学分野): “Arc welding ( )” US Air Force from USA / Public domain (cropped)
- Related lab (接合界面機構学分野): “Friction Stir Weld” NASA / Public domain (cropped)
- Related lab (微細接合学分野): “Electronic Printed Circuit Board” JayHand / CC BY-SA 3.0 (cropped)
- Related lab (エネルギー変換機構学分野): “Plasma directed” Volker urban / Public domain (cropped)
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