The effect of La2O3 and Y2O3 additions on the improvement of regenerated cemented carbide properties was investigated. The WC-Co powder recycled by the zinc melting method was used as a raw material, and five alloys were prepared by conventional powder metallurgy process by adding La2O3 and Y2O3 with 0, 0.3, and 0.6 wt.%, separately. The results show that they have a certain effect on the carbide compactness, but it is not obvious. When the La2O3 or Y2O3 content is less than 0.3 wt%, the hardness of regenerated cemented carbide will be slightly increased and then significantly decreased. A rare-earth oxide exhibits significant improvement of fracture toughness and transverse rupture strength, and the performance of carbide with Y2O3 is better than that with La2O3. When 0.3 wt.% Y2O3 is added, integrated mechanical properties of regenerated cemented carbide are excellent: hardness is 1720 HV30 kgf, fracture toughness is 8.41 MPa ·m1/2, and rupture strength is 1653 MPa.
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Acknowledgments
This work was financially supported by the Natural Science Foundation of China (51705228), Natural Science Foundation of Guangdong Province (2018A030307017), Zhanjiang Financial Science and Technology Special Competitive Allocation Projects (2017A02021), and Non-Funded Science and Technology Project of Zhanjiang, China (2019B01078). The research was also supported by the Natural Research Project (LP1842 and LP2023) of the Lingnan Normal University, China.
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Translated from Problemy Prochnosti, No. 4, pp. 97 – 104, July – August, 2021.
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Xia, X.Q., Gong, M.F. Effects of Rare-Earth Oxides on the Microstructure and Mechanical Properties of Regenerated Cemented WC-12Co-2Ni Carbide. Strength Mater 53, 619–626 (2021). https://doi.org/10.1007/s11223-021-00324-9
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DOI: https://doi.org/10.1007/s11223-021-00324-9