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Evaluation of Fracture Toughness of Tantalum Carbide Ceramic Layer: A Vickers Indentation Method

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Abstract

A tantalum carbide (TaC) ceramic layer was produced on gray cast iron matrix by in situ technique comprising a casting process and a subsequent heat treatment at 1135 °C for 45 min. Indentation fracture toughness in TaC ceramic layer was determined by the Vickers indentation test for various loads. A Niihara approach was chosen to assess the fracture toughness of TaC ceramic layer under condition of the Palmqvist mode in the experiment. The results reveal that K IC evaluation of TaC ceramic layer by the Vickers indentation method strongly depends on the selection of crack system and K IC equations. The critical indentation load for Vickers crack initiation in TaC ceramic layer lies between 1 and 2 N and the cracks show typical intergranular fracture characteristics. Indentation fracture toughness calculated by the indentation method is independent of the indentation load on the specimen. The fracture toughness of TaC ceramic layer is 6.63 ± 0.34 MPa m1/2, and the toughening mechanism is mainly crack deflection.

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Acknowledgments

This project is supported by the National Science and Technology Plan of Russia’s Cooperation Project of China (No. 2014DFR50630) and the National Natural Science Foundation of China (No. 51374169 and No. 51501148). The authors would also like to acknowledge the Doctoral Starting Fund of Xi’an University of Technology (No. 101-451115009), the Doctorial Innovation Foundation of Xi’an University of Technology (No. 310-11202j404), and the Project of the Shaanxi Key Laboratory of Nano Materials and Technology (13JS053, 14JS0046 and 14JS0048).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, China

    Ke Song, Yunhua Xu, Nana Zhao, Lisheng Zhong, Zhao Shang & Liuliu Shen

  2. Shaanxi Key Laboratory of Nano Materials and Technology, Xi’an, 710055, China

    Yunhua Xu & Juan Wang

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  1. Ke Song
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  2. Yunhua Xu
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Correspondence to Yunhua Xu.

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Song, K., Xu, Y., Zhao, N. et al. Evaluation of Fracture Toughness of Tantalum Carbide Ceramic Layer: A Vickers Indentation Method. J. of Materi Eng and Perform 25, 3057–3064 (2016). https://doi.org/10.1007/s11665-016-2161-x

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  • DOI: https://doi.org/10.1007/s11665-016-2161-x

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