Surface hardening treatment of light metal materials using active screen plasma nitriding

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560896
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Material processing/treatments
• Research Institution: Kansai University
• Principal Investigator: NISHIMOTO Akio 関西大学, 化学生命工学部, 教授 (70330173)
• Research Collaborator: MATSUKAWA Tatsuya 関西大学大学院, 理工学研究科 ; NAKAZAWA Kunishige 関西大学大学院, 理工学研究科 ; KIZAWA Yoshitaka 関西大学大学院, 理工学研究科 ; TANAKA Toshiya 関西大学大学院, 理工学研究科
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 表面改質 / プラズマ窒化 / アクティブスクリーン / 軽金属 / チタン合金 / 表面熱処理

Outline of Final Research Achievements

Ti-6Al-4V alloy was active screen plasma nitrided using a double titanium screen under various process conditions. The ASPN process variables included treatment temperature (873 K), treatment time (1, 5 and 25 h) and gas mixture (75/25 of N2/H2) under 200 Pa pressure. Cross-sectional microstructure and GDOES results demonstrated that a Ti nitride compound layer consisting of TiN followed by Ti2N was formed on top of the surface. The surface hardness of the nitrided sample showed 1300 HV. Friction wear test results indicated that the friction resistance of the ASPN treated sample for 25 h improved considerably compared with the untreated sample.

Free Research Field

金属材料の表面改質