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Effect of La2O3 additions on microstructure and mechanical properties of Ti (C,N)-WC-Mo2C-Ni-Co cermets

La2O3添加量对Ti(C,N)-WC-Mo2C-Ni-Co 金属陶瓷组织结构和力学性能的影响

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Abstract

Rare earth elements were considered alternative additives beneficial to the TiCN based cermets, but their effect with high content Mo2C has not been thoroughly investigated. In this study, Ti(C, N)-WC-Mo2C-Cr3C2-Ni-Co cermets containing 12 wt.% Mo2C doped with different contents of La2O3 were prepared by vacuum hot-press sintering at 1500 °C. Parametrical analysis on La2O3 addition (0, 0.5 wt.%, 1.0 wt.%, 1.5 wt.%, and 2.0 wt.%) was conducted, in terms of microstructure and mechanical properties of Ti(C, N) based cermets. Experimental results show that when the content of La2O3 increases from 0 to 1.0 wt.%, the ratio of core phase increases while the ratio of brittle rim phase decreases. Nanostructure is formed on the grain boundary of ceramic phase, which effectively inhibits the abnormal growth of rim structures. This can thin the brittle shell, coarsen the core phase, and refine the grains, thus improving its mechanical properties, including hardness and fracture toughness. When the addition amount of La2O3 increases from 1.5 wt.% to 2.0 wt.%, it will aggregate to form larger particles of about 100 nm, which sharply reduces its mechanical properties. The optimal La2O3 addition is 1.0 wt.%, in which Ti(C,N)-based cermets show the optimal comprehensive mechanical properties: the Vickers hardness and fracture toughness are 16.55 GPa and 6.14 MPa·m1/2, respectively. This work provides further knowledge about the effect of rare earth on the core-rim structure and mechanical properties of Ti(C,N)-based cermets with high Mo2C contents.

摘要

稀土元素被认为是可以有效改善TiCN 基金属陶瓷性能的添加剂,但其在高Mo2C含量下的效果尚未得到深入研究。本研究采用真空热压烧结技术,在1500 °C 下制备了不同La2O3含量的Ti(C,N)-WC-Mo2C-Cr3C2-Ni-Co 金属陶瓷,其中Mo2C含量为12 wt.%。对不同La2O3添加量(0.5 wt.%、1.0 wt.%、1.5 wt.%和2.0 wt.%)对Ti(C,N)基陶瓷显微组织和力学性能的影响进行了参数化分析。结果表明,当La2O3含量增加到1.0 wt.%时,芯相的比例增加,脆壳相的比例减少; 在陶瓷相晶界上形成的纳米结构,有效抑制了壳相组织的异常长大,这使得金属陶瓷的脆壳相变薄,硬质相颗粒细化,从而提高了其硬度和断裂韧性等力学性能。当La2O3的添加量从1.5 wt.%增加到2.0 wt.%时,La2O3团聚形成直径约100 nm 的较大颗粒,大幅度降低了金属陶瓷的力学性能。当La2O3添加量为1.0 wt.%时,Ti(C,N)基陶瓷的综合力学性能最佳,其维氏硬度和断裂韧性分别为16.55 GPa 和6.14 MPa·m1/2。本研究有助于进一步揭示稀土氧化物对高Mo2C含量Ti(C,N)基陶瓷芯壳结构和力学性能的影响。

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Authors and Affiliations

  1. National Engineering Research Centre of Near-net-shape Forming Technology for Metallic Materials, South China University of Technology, Guangzhou, 510640, China

    Hao Qiu  (邱昊), Xiao-qiang Li  (李小强), Chen-yang Jiang  (江晨阳), Cun-liang Pan  (潘存良) & Sheng-guan Qu  (屈盛官)

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  1. Hao Qiu  (邱昊)
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  2. Xiao-qiang Li  (李小强)
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Contributions

QIU Hao contributed to conceptualization, data curation and investigation, and wrote the original draft of manuscript. LI Xiao-qiang contributed to funding acquisition and supervision, and edited the manuscript. JIANG Chen-yang and PAN Cun-liang edited and reviewed the manuscript supportively. QU Sheng-guan acquired the financial support.

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Correspondence to Xiao-qiang Li  (李小强).

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Foundation item: Project(51474108) supported by the National Natural Science Foundation of China; Project(208081725043) supported by the Natural Science Foundation of Guangdong Province, China; Project(1203) supported by the Innovation-driven Development Science and Technology Project of Economic Development District of Yichun, China

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Qiu, H., Li, Xq., Jiang, Cy. et al. Effect of La2O3 additions on microstructure and mechanical properties of Ti (C,N)-WC-Mo2C-Ni-Co cermets. J. Cent. South Univ. 30, 1751–1762 (2023). https://doi.org/10.1007/s11771-023-5362-0

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