引用本文:童庆,陈泉志,莫秋凤,董婉冰,蒋智秋,李伟洲.预置Ti粉对激光氮化TC4涂层组织及性能的影响[J].中国表面工程,2018,31(5):167~174
TONG Qing,CHEN Quanzhi,MO Qiufeng,DONG Wanbing,JIANG Zhiqiu,LI Weizhou.Effects of Pre-set Ti Powder on Microstructure and Properties of Laser Nitriding TC4 Coating[J].China Surface Engineering,2018,31(5):167~174
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预置Ti粉对激光氮化TC4涂层组织及性能的影响
童庆1, 陈泉志1, 莫秋凤1, 董婉冰1, 蒋智秋1, 李伟洲1,2
1.广西大学 资源环境与材料学院, 南宁 530004;2.广西大学 广西有色金属及特色材料加工重点实验室, 南宁 530004
摘要:
采用直接激光氮化及表面预置1 mm钛粉后再激光氮化两种工艺在TC4合金表面制备了涂层。通过XRD和带能谱仪（EDS）的场发射扫描电镜（SEM）分析了涂层的物相结构、微观形貌和局部化学成分。由摩擦磨损试验仪、喷砂机和电化学工作站分别检测了涂层的滑动摩擦性能、抗冲蚀磨损性能以及电化学腐蚀性能。结果表明：两种工艺制备的涂层主要由TiNx（x=1、0.98和0.90）树枝晶、α-Ti片状晶及表面TiO2组成。经激光氮化处理后TC4合金的抗滑动摩擦、抗冲蚀磨损和耐酸蚀性能均得到了较大的提升。其中预置粉后再激光氮化由于反应充分，获得的涂层较厚，氮含量高，成分分布均匀，其抗滑动磨擦性能较TC4合金基体及直接激光氮化的样品分别提升了5.3倍和1.3倍，稳定的冲蚀失重率比基体及直接激光氮化的样品分别降低了37%及12%，极化电阻分别提高了18 915和12 537 Ω。
关键词:  激光氮化  TC4  微观组织  摩擦磨损  电化学腐蚀
DOI：10.11933/j.issn.1007-9289.20180109004
分类号:TG174.44
基金项目:国家自然科学基金（51371059）；广西自然科学基金（2014GXNSFCA118013，2016GXNSFDA380022）；广西高等学校高水平创新团队项目
Effects of Pre-set Ti Powder on Microstructure and Properties of Laser Nitriding TC4 Coating
TONG Qing1, CHEN Quanzhi1, MO Qiufeng1, DONG Wanbing1, JIANG Zhiqiu1, LI Weizhou1,2
1.School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China;2.Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China
Abstract:
The nitriding coatings were prepared by direct laser nitriding TC4 (N-TC4) and laser nitriding TC4 with 1 mm titanium power preset on the surface (N-Ti-TC4), respectively. The XRD and field emission scanning electron microscopy (SEM) with EDS were used to analyze phase structure, morphology and local chemical composition of the coating. Sliding friction and erosion wear properties and electrochemical corrosion resistance of the coating were characterized by friction wear tester, sand blasting machine and electrochemical workstation, respectively. Results show that mainly TiNx(x=1, 0.98 and 0.90) dendrites, α-Ti flake crystals and surface TiO2 are formed in both coating. The sliding friction and erosion wear properties and electrochemical corrosion resistance of TC4 alloy are markedly improved after laser nitriding. Due to full reaction of Ti with N, the N-Ti-TC4 coating is thicker and exhibits uniform composition with higher nitrogen content than the N-TC4 coating. The sliding wear resistance of the N-Ti-TC4 coating is 5.3 times and 1.3 times higher than that of the TC4 alloy substrate and the N-TC4 coating, respectively. The erosion wear loss rate is reduced by 37% and 12%, respectively. The polarization resistance value of the N-Ti-TC4 is 18 915 Ω higher than that of the TC4 alloy, and 12 537 Ω higher than that of the N-TC4 coating.
Key words:  laser nitriding  TC4  microstructures  friction and wear  electrochemical corrosion
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