As environmental and energy problems become more serious on a global scale, we are engaged in research and development of green process technologies that greatly reduce the environmental load. In particular, we are focusing on nano- and micro- particles, which work as the functional elements, and are developing their bottom-up synthesis methods and methodologies for assembling them as building blocks in the desired two-dimensional and three-dimensional shapes. In addition, the green process technologies developed in this research field are used to create materials and devices related to the environment and energy field.

(Top) Reductant free synthesis of metal nanoparticles
(Middle) Shape-controlled synthesis of oxide particles
(Bottom) Synthesis of high entropy nanomaterials

(Top) Direct Ink Writing of NP ink
(Left-bottom) Visible-light induced patterning of metal NPs
(Right-central) Hydrothermal coating of metal NPs
(Right-bottom) Magnetic Self-assembly of NP

Members

Prof.

H. ABE

Assist. Prof.

T. KOZAWA

Lithographic Additive Manufacturing (AM) is a newly developed novel process for creating three-dimensional (3D) structures using two-dimensional (2D) layer laminations. In this process, nanomaterials of metals and ceramics are dispersed into resin paste to be used in the original AM processes. In substrate techniques, a high power laser beam is scanned on a spread paste for 2D layer drawing and 3D structure forming. In deposition techniques, the paste is introduced into a high-temperature plasma or gas flame for 2D cladding and 3D patterning. The energy control structures created (i.e., magnetic devices, power modules, heat convertors, acoustic modulators, and vibration absorbers) and material control structures (i.e., fluid filters, grinding tools, and biological implants) will contribute to sustainable development.

Laser Scanning Stereolithography of Additive Manufacturing to Fabricate Bulky Metal and Ceramic Components with Micro Geometric Patterns

Thermal Spraying Using Fine Particle Pastes to Laminate Metal and Ceramic Coated Layers with Functional Nano/Micro Structures

Members

Prof.

S. KIRIHARA

Assist. Prof.

F. SPIRRETT

S. A. Prof.

S. Fujimoto

In the quality improvement of additively manufactured (AM) metal components with 3D complex shape, it is necessary to establish a fundamental theory of the alloying design and process optimization to control microstructures and crystal orientation through understanding additively manufacturing mechanism based on a rapid solidification of metal powder and thermal cycle effects. This department focuses on research projects regarding the formation mechanism of ultrafine microstructures and supersaturated solid solution by rapid solidification process and mechanical behavior in multiscale analysis of selective laser melted (SLMed) materials.

Compressive stress-strain curves of fabricated CP-Ti, Ti-6%Al-4%V, and Ti-7%ZrH₂; (a) split-p, (b) diamond, and (c) gyroid TPMS lattice struc-tures, and stress–strain curves of LPBF-fabricated Ti with ZrH₂ additions of (a) 0%, (b) 1%, (c) 2%, (d) 3%, (e) 5%, and (f) 10%.
A. Issariyapat, et al., Additive Manufacturing, 73 (2023) 103649.

Members

Prof.

K. KONDOH

Prof.

J. UMEDA

Assoc. Prof.

S. KARIYA

In this department, fundamental studies on laser additive manufacturing (LAM) are performed and apparatuses for LAM are developed. In particular, the apparatuses installed with high power blue diode lasers are also developed since those lasers enable stable and high efficient melting of metal materials such as copper. Furthermore, in order to realize high-quality and high-speed LAM, we will experimentally and theoretically proceed with the analysis of the melting and solidification process of the material by laser irradiation. Utilizing the obtained knowledge, we will work on the creation of innovative LAM processes and the development of equipment and promote their social implementation.

Additive manufacturing of copper using blue diode laser
(a)3D rod formation
(b) Microcoating of copper alloy
(c) JWRI logo by SLM
(d) Osaka University's school emblem by SLM

Members

Prof.

M. TSUKAMOTO

Assoc. Prof.

Y. SATO

Assist. Prof.

K. TAKENAKA

In the Department of Advanced Additive Manufacturing, renowned researchers from Japan and abroad are invited by the management committee of the Research Center for Additive Joining Application (RAJA). The main goal is to introduce scientific knowledge and practical technologies to drive innovative developments of novel processes in this research area. A wide range of materials are considered for processing, such as various metals including special alloys, and inorganic composites such as functional ceramics. Furthermore, welding heat sources including laser, arc, and plasma will be practically used in the manufacturing processes, and solid-phase and chemical joining methods such as powder sintering and photo-polymerization will be actively considered.

Members

Prof.

H. FUJII

Prof.

T. NAKANO

G. Prof.

A. B MURPHY

G. Prof.

R. GOODRIDGE

G. Prof.

S.F. GOECKE

G. Prof.

M. YAMAMOTO