Electrical discharge machining of medical titanium alloy by using spark plasma sintering body tool electrode

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K14864
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 18020:Manufacturing and production engineering-related
• Research Institution: Nagaoka National College of Technology
• Principal Investigator: Kaneko Kensei 長岡工業高等専門学校, 機械工学科, 准教授 (60708618)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 放電プラズマ焼結 / 放電コーティング / 窒化チタン / ホウ化チタン / チタン合金 / 放電時間 / 元素分析

Outline of Final Research Achievements

The characteristics of electrical discharge machining of titanium alloys by using a TiN tool electrode were clarified, aiming at simultaneous machining and TiN coating in EDM of titanium alloys for medical applications. High removal rate and low tool electrode wear were obtained by adding TiB2 to TiN sintering body as an auxiliary agent. A coating layer of about 50 μm was formed on the machined surface. The thickness of the coating layer can be controlled by the discharge time. Elemental analysis of the coating layer revealed that TiN, the tool electrode material, was formed.

Free Research Field

加工学および生産工学

Academic Significance and Societal Importance of the Research Achievements

工具電極に材料と加工雰囲気の組み合わせによって医療用チタン合金の放電加工における成形加工とTiNコーティングの同時処理ができることを明らかにした．チタン合金の成形加工とTiNコーティングの同時加工は，微小凹凸による骨適合性とTiNによる無毒で高い細胞親和性を両立している．工学と医学の両分野におけるチタン合金の高付加価値加工法が確立されたといえる．