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10-05-2016 | Issue 6/2016

Journal of Materials Engineering and Performance 6/2016

Microstructure and Scratch Resistance of TaC Dense Ceramic Layer on an Iron Matrix

Journal:
Journal of Materials Engineering and Performance > Issue 6/2016
Authors:
Nana Zhao, Yunhua Xu, Lisheng Zhong, Honghua Yan, Vladimir E. Ovcharenko

Abstract

A tantalum carbide dense ceramic layer with a thickness of ~20 μm was produced on the surface of an iron matrix using an in situ technique. The morphology, microstructure, and phase composition of the layer were characterized by means of SEM, TEM, and XRD. The results show fairly agglomerated and uniformly sized (~200 nm) TaC particulates with a face-cantered cubic structure. The values of nano-hardness for the surface and cross section of reinforcing layer can be as high as 29.5 ± 0.6 and 26.7 ± 0.1 GPa, respectively, which were analyzed using a nano-indentation apparatus. Moreover, the scratch resistance of the layer was measured by scratch tests under a progressively increasing load of 0-100 N. A high critical load of 90.4 N is obtained. It is worthy to note that there are only cracking, slight splitting, and small flaking pits (even at the maximum load) all over the whole scratch process, namely the reinforcing layer can protect the iron matrix from serious abrasion effectively. In addition, the excellent scratch resistance and mechanism are discussed in detail.

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