脱炭素、安全・安心社会の実現に向けて、産業機器、エネルギー機器、モビリティをはじめとした様々な分野の省エネ化、高安全化に資する最先端材料やモノづくりのプロセスに関する研究開発
（マテリアルズインフォマティクスを活用した金属・樹脂・複合材料等の最先端材料技術に関する研究開発および省エネ化、社会インフラプロダクトを支えるモノづくり工程のデジタル化、CO2排出削減に向けた材料プロセス技術、検査・計測機器の高度化技術）
金属・樹脂・複合材料等の最先端材料、高信頼化技術、プロセス技術、マテリアルズインフォマティクス（材料シミュレーション、プロセスシミュレーション）、モノづくりDX化技術（材料プロセスナレッジとデジタル技術の両方を用いた開発）、光学設計技術
Publishing Academic Papers:
Masahiro Ito , Kenya Ohashi, Kazumi Fujii, Kyoko Hombo, Katsumasa Miyazaki, Azusa Ooi, Eiji Tada, Atsushi Nishikata
ISIJ International, Vol. 62 (2022), No. 3, pp. 568–576
Identification of Chromium-Depleted Area around Chromium Nitride Precipitates in Heat-affected Zone of Lean-Duplex Stainless Steel and In-situ Observation of Preferential Dissolution by EC-AFM
Abstract: A Gleeble thermo-mechanical simulator was used to simulate the welds of duplex stainless steel S32101. A micro-precipitate of chromium-nitride and its surroundings in the simulated welds was analyzed in detail by SEM/AES and EC-AFM. The AES analysis revealed that a chromium-depleted area is present in the γ phase near the chromium-nitrides precipitated at the α/γ grain boundary. The EC-AFM observation revealed that the duplex stainless steel preferentially dissolves from the chromium-depleted area.
J. KUSUKAWA, N. TSUYUNO, T. TOKUYAMA, K. NAKATSU, A. MATSUSHITA, T. ISHI "Partial Discharge Properties of Conductor Laminated Insulation Sheet for High Withstand Voltage Double-Sided Direct Cooling Power Module", MES2021, 22B3 (2021)
Abstract: Prevention of partial discharge is an issue for increasing the withstand voltage of power modules using resin insulating sheets. We have developed an insulating structure that improves the partial discharge voltage by forming a conductive layer in the middle of the insulating sheet and dividing the voltage between the upper and lower insulating layers. It was verified that the electric field of the void, which causes partial discharge, can be relaxed by using electric field analysis, and that the partial discharge voltage is improved by the insulation test using the element sample.
Tomio Iwasaki "Materials Informatics Technique for Designing Strong-Adhesion Interfaces in Electronics Devices"Transactions of The Japan Institute of Electronics Packaging Vol. 13, 2020
Abstract: A materials-informatics technique for designing strong flat interfaces has been developed by use of advanced molecular simulations that can calculate the delamination energy as the adhesion strength. In this study, this technique is applied to the design of metals with strong adhesion to organic materials such as polyimide and DNA. At the first stage, the interatomic spacings were selected as the important, dominant metal parameters from four metal parameters (the short-distance and long-distance interatomic spacings, electronegativity, and surface energy density) by using sensitivity analy-sis based on the design-of-experiments method with the delamination-energy data calculated from advanced molecular simulations. At the second stage, the adhesion strength (delamination energy) was expressed as a function of the impor-tant metal parameters (i.e., the short-distance and long-distance interatomic spacings) by using a response-surface method (Kriging method). At the third stage, by solving the maximum-value problem of the function, it was found that the metal that has the same short-distance and long-distance interatomic spacings as those of organic materials has the strongest adhesion to the organic materials. Finally, it was found that the metal (Ni-12%Mn) whose lattice matches with polyimide has the strongest adhesion to polyimide and that the Zr/Dy/Y multilayer whose lattice matches with B-DNA’s lattice has the strongest adhesion to B-DNA.
第 31 回 マイクロエレクトロニクスシンポジウム ベストペーパー 賞（2022）
「高耐圧両面直接冷却型パワーモジュール向け導体積層絶縁シートの部分放電特性」
2022 年度溶接学会ベストオーサー賞
「最新の溶接技能伝承」 「高精度動作センシングによる溶接技能デジタル化と溶接士技能を搭載した溶接自動化
2022年度 第31回ポリマー材料フォーラム 広報委員会パブリシティ賞
「公開データから探索したバイオ由来ポリ乳酸樹脂用添加剤の効果実証」
2021年度 日本溶接協会 技術賞
「自動車燃料系部品へのレーザ溶接溶込み深さ 全数検査技術の適用」
International Organization for Standardization the ISO Excellence Award (2021)
「Contributions to the development of ISO 7539-10:2020 Corrosion of metals and alloys - Stress corrosion testing - Part 10: Reverse U-bend met」
2020年度 エレクトロニクス実装学会 技術賞
「急速充電対応800V車載インバータを実現するパワーモジュール樹脂絶縁構造の開発」
2020年度 日本機械学会 材料力学部門 業績賞
「電子デバイスを高信頼化させる原子レベル材料設計に関する先駆的研究」
全国発明表彰「内閣総理大臣賞」を受賞
https://www.hitachi.co.jp/New/cnews/month/2022/05/0531b.pdf
公開データのAI分析で強度と生分解性を両立させるバイオ由来樹脂用添加剤を探索し実証
https://main.spsj.or.jp/koho/koho_top.php
