Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第1期    总第226期    2018年1月

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文章编号:1004-0609(2018)-01-0046-07
Ti6Al4V合金表面激光熔覆NiCrAlSi复合涂层的组织及高温抗氧化性能
徐江宁1,刘秀波1, 2,乔世杰1,翟永杰1,涂 溶2

(1. 苏州大学 机电工程学院,苏州 215006; 2. 武汉理工大学 材料复合新技术国家重点实验室,武汉 430070)

摘 要: 为提高Ti6Al4V合金的高温抗氧化性能,以Ni80Cr20-40Al-20Si(质量分数,%)复合合金粉末为原料,采用激光熔覆技术,在Ti6Al4V合金表面制备复合涂层,系统地分析涂层的物相、显微组织结构及高温抗氧化性能。结果表明:复合涂层中没有发现裂纹,仅有少量气孔,且与基体实现良好的冶金结合;Ti5Si3/Al3Ni2作为增强相均匀分布于基体Al3Ti/NiTi中;经恒温800 ℃氧化32 h后,复合涂层的氧化膜主要由Al2O3和NiO组成,结构连续致密,氧化动力学曲线近似符合抛物线规律,表现出较好的高温抗氧化性能;而Ti6Al4V合金的氧化膜主要为疏松的TiO2,表面氧化严重,表现出较差的抗氧化性能。激光熔覆NiCrAlSi复合涂层可望成为有效提高Ti6Al4V合金高温抗氧化性能的途径之一。

 

关键字: 激光熔覆;复合涂层;显微组织;高温氧化

Microstructure and high-temperature oxidation resistance of NiCrAlSi composite coating on Ti6Al4V alloy by laser cladding
XU Jiang-ning1, LIU Xiu-bo1, 2, QIAO Shi-jie1, ZHAI Yong-jie1, TU Rong2

1. School of Mechanical and Electric Engineering, Soochow University, Suzhou 215006, China; 2. State Key Laboratory of Advanced Technology for Materials Synthesis Processing, Wuhan University of Technology, Wuhan 430070, China

Abstract:In order to enhance the high-temperature oxidation resistance of Ti6Al4V alloy, Ni80Cr20-40Al-20Si (mass fraction, %) precursor mixed powders were adopted to prepare the protective composite coating on Ti6Al4V alloy by laser cladding. The phase compositions, microstructure and high temperature oxidation resistance of the composite coating were investigated, and the corresponding mechanisms were discussed. The results indicate that the coating which has metallurgical bonding with the substrate, has few pores, and is crack free, and mainly consists of primary Ti5Si3/Al3Ni2 reinforced particles and the inter-primary Al3Ti/NiTi intermetallic compounds matrix. The composite coating can form dense oxide scale consisting of Al2O3 and NiO on the surface, the oxidation dynamic curve is approaching parabolic, indicating good high-temperature oxidation resistance, after isothermal oxidation test at 800 ℃ for 32 h. While the Ti6Al4V alloy is oxidized severely because of the high affinity of Ti atoms to O atoms and the non-protective oxide scales of TiO2. Laser cladding NiCrAlSi composite coating is a promising way to improve the oxidation resistance of Ti6Al4V alloy.

 

Key words: laser cladding; composite coating; microstructure; high temperature oxidation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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