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| Abrasive Wear Characteristics of Surface Gradient Composites of TaC Reinforced Iron Matrix Prepared by In-Situ Technology |
Nana ZHAO1,Yunhua XU1,**( ),Lisheng ZHONG2,Xing HUANG1,Wenke MENG1,Fangxia YE1 |
1. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048
2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072 |
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Cite this article:
Nana ZHAO,Yunhua XU,Lisheng ZHONG,Xing HUANG,Wenke MENG,Fangxia YE. Abrasive Wear Characteristics of Surface Gradient Composites of TaC Reinforced Iron Matrix Prepared by In-Situ Technology. Chinese Journal of Materials Research, 2014, 28(8): 567-572.
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Abstract Tantalum carbide gradient composite was fabricated via in-situ reaction of pure tantalum plate with gray cast at high temperature. The morphology, phase constituent, microhardness, and relative abrasion resistance of the composite were characterized by scanning electron microscopy, X-ray diffraction, microhardness tester and abrasive wear testing machine. The results show that the thickness of the gradient composite is about 475 μm. The cast 170 μm thick surface layer is a dense ceramic layer consisted of ~95% submicron TaC particles, and the highest micro-hardness value of which is 2328HV0.1; In the sub-layer, there exists a gradient distribution of TaC particles from 90% to 0% in volume fraction, correspondingly the microhardness value decreased from 915HV0.1 to 410HV0.1, and the size of the TaC particles increased to 0.5-1.5 μm; the interface between the composite and matrix exhibits a perfect metallurgical bonding. The TaC reinforced iron matrix surface gradient composite shows far superior wear resistance than the gray cast iron. The wear mechanism is mainly related with the local plastic deformation, micro cracking caused by misrouted broken carbide particles.
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Received: 26 November 2013
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| Fund: *Supported by National High Technology Research and Development Program of China No.2013AA031803 and National Natural Science Foundation of China No.51374169. |
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