Development of nano-structured Al2O3-TiB2-TiN coatings by combined SHS and laser surface alloying

被引：30
作者：
Chatterjee, Satyajit [1 ]
Shariff, S. M. [3 ]
Majumdar, J. Datta [2 ]
Choudhury, A. Roy [1 ]
机构：
[1] Indian Inst Technol, Dept Mech Engn, Kharagpur 721302, W Bengal, India
[2] Indian Inst Technol, Dept Met & Mat Engn, Kharagpur 721302, W Bengal, India
[3] Int Adv Res Ctr Powder Met & New Mat ARCI, Hyderabad, Andhra Pradesh, India
来源：
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY | 2008年 / 38卷 / 9-10期
关键词：
coating; laser; alloying; nano; SHS; surface;
D O I：
10.1007/s00170-007-1143-4
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
A powder mixture of aluminium (Al), titania (TiO2) and hexa-boron nitride (h-BN) was laser-triggered to undergo SHS (self-propagating high temperature synthesis) and was subsequently laser alloyed onto a mild steel substrate surface. A nano-structured coating was formed with high microhardness (similar to 3000 HV0.05 at the cross-section and similar to 2600 HV0.2 on the top surface). X-ray diffraction (XRD) identified the presence of aluminium oxide (Al2O3), titanium di-boride (TiB2), titanium nitride (TiN), iron (Fe) and its borides (FeB, Fe2B) in the coating. Scanning electron microscopy (SEM) and high resolution transmission electron microscopic (HRTEM) analysis of the coating revealed nano-fibrous titanium-rich reinforcements in a matrix of nano-crystalline alumina. The thickness of titanium di-boride nano-fibres was an order of magnitude higher than the size of nano-alumina crystallites.
引用
收藏
页码：938 / 943
页数：6
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