CAJ | 학술논문

目的利用等离子浸没注入技术(PIII)改质钛-铝-钒(Ti-6Al-4V)表面,探讨高温注入及后续退火处理的改性效果.方法将Ti-6Al-4V合金以氮气等离子注入,藉检测表面氮离子的分布、表面结构/粗糙度、材料晶体及摩擦系数等性质,以评估PIII表面改性的效果.结果提高注入温度,表面氮注入层浓度的峰值呈轻度下降;渗透深度则略为上升.硬度与注入层厚度呈良好相关性,但在高温下注入,表面溅射将造成材料的粗化,摩擦系数上升.600～800℃间高温下退火处理,同样可达到提高注入深度及促使TiN及Ti2N晶体生成、提升硬度的效果,同时升温退火处理也会造成粗糙度的微幅上升.结论本研究藉表面物化性及力学性质的量测,初步发现Ti-6Al-4V于室温下以等离子浸没注入技术注入,并于700℃下经 30 min退火处理,可得到高硬度、低摩擦系数、耐磨损的适用于人工关节应用表面的技术.
목적 이용등리자침몰주입기술(PIII)개질태-려-범(Ti-6Al-4V)표면,탐토고온주입급후속퇴화처리적개성효과.방법 장Ti-6Al-4V합금이담기등리자주입,자검측표면담리자적분포、표면결구/조조도、재료정체급마찰계수등성질,이평고PIII표면개성적효과.결과 제고주입온도,표면담주입층농도적봉치정경도하강;삼투심도칙략위상승.경도여주입층후도정량호상관성,단재고온하주입,표면천사장조성재료적조화,마찰계수상승.600～800℃간고온하퇴화처리,동양가체도제고주입심도급촉사TiN급Ti2N정체생성、제승경도적효과,동시승온퇴화처리야회조성조조도적미폭상승.결론 본연구자표면물화성급역학성질적량측,초보발현Ti-6Al-4V우실온하이등리자침몰주입기술주입,병우700℃하경 30 min퇴화처리,가득도고경도、저마찰계수、내마손적괄용우인공관절응용표면적기술.
Objective The effects of implantation and annealing temperatures on the surface properties of a Ti-6Al-4V alloy modified by the plasma ion immersion implantation(PIII) technique. The results are to be applied to the development of a surface plasma treatment technique for the metallic element used in an artificial joint. Methods The substrates of Ti-6Al-4V alloy were implanted by N2 plasma and surface properties of:nitrogen distribution profile, surface morphology/roughness, crystallographic structure, and friction coefficient were analyzed to evaluate the performance of the modified surfaces.Results Increasing the implantation temperature in a PIII process slightly decreases the peak concentration of the implanted nitrogen layer while increases the penetration depth. As the temperature rises, the plasma ions strike a surface with higher energy and thus induce surface sputting, which increases surface roughness and friction coefficient. Surfaces annealed at 600-800℃ is accompanied with the increases in nitrogen penetration depth, TiN and Ti2N formation, and surface hardness. Also, the surface roughness is slightly increased with the annealing treatment.Conclusions By analyzing the chemical, physical and mechanical properties of a surface modified by plasma ion immersion implantation technique, it is found that a Ti-6Al-4V surface implanted at room temperature followed by annealing at 700℃ for 30 min gives high surface hardness and the lowest friction coefficient and appeared to be the most promising technique for improving the wear resistance of a Ti-6Al-4V alloy material.