| 학회 | 한국재료학회 |
| 학술대회 | 2011년 가을 (10/27 ~ 10/29, 신라대학교) |
| 권호 | 17권 2호 |
| 발표분야 | E. Structural Materials and Processing Technology(구조재료 및 공정기술) |
| 제목 | Formation and Oxidation of Nitrided layers formed on Titanium alloys by Gas Nitriding |
| 초록 | Many types of titanium-based alloys have been developed over the past years. They are widely used in aerospace application and corrosive environments because of their superior properties such as high specific strength and modulus, excellent corrosion resistance in many active environments, and high temperature capability as well as cryogenic properties in some cases. However, they have found little use in mechanical engineering applications due to their poor tribological properties such as poor abrasive and wear resistance, a tendency to galling and seizure, a tendency to fretting wear and fretting fatigue, and high coefficient of friction. The formation and oxidation of nitride layers formed on titanium alloys by gas nitriding were investigated in this study. The gas nitriding treatment has many advantages for titanium nitride synthesis: (i) this technique takes advantage of the high affinity of titanium with nitrogen to produce the hardened surface layer which is well bonded to the tough matrix; (ii) ecological clean, high economical and low cost. Although the hard nitride layers improve the wear resistance, the high temperature oxidation resistance is also important for the titanium-based alloy because the hard coatings are frequently exposed to oxidative atmospheres. It is also important to study the correlation between the nitriding parameters and the hardness of the materials in order to achieve properties desired for various applications. This would allow an optimization of the processing parameters and alloy composition in order to achieve properties desired for various applications. In this study, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to determine the structures at the surface and in the nitrided zone. Also, a TEM study was newly performed to examine the nitride layer. Microindentation hardness testing using Vickers hardness tester as well as nanoindentor indicated that microhardness increased with the increase in the oxynitriding temperature. The results are discussed to throw some light on high temperature nitrding and oxynitriding phenomenon. 이 연구는 2010년도 교육과학기술부의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업 (2010-0023002)입니다. |
| 저자 | 김민정, 이동복, 봉성준, 김슬기 |
| 소속 | 성균관대 |
| 키워드 | Nitriding; Titanium alloys; Oxidation |
