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Ultra-fine W–Y2O3 composite powders prepared by an improved chemical co-precipitation method and its interface structure after spark plasma sintering

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A Correction to this article was published on 21 August 2021

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Abstract

Y2O3-doped tungsten (W–Y2O3) composite powders prepared by a traditional chemical co-precipitation method possess obvious bimodal distribution in size, which would deteriorate their sintering properties. The bimodal distribution can be effectively eliminated by an improved chemical co-precipitation method, in which the cationic surfactant cetyltrimethylammonium bromide (CTAB) was innovatively employed. The reduced powders with excellent uniformity have an average grain size of only ~ 31.5 nm. It is noteworthy that Y2O3 particles would fuse and grow with the growth of W grains during subsequent spark plasma sintering (SPS) process, which was rarely reported in relevant literature before. On top of that, phase interfaces of sintered W–Y2O3 alloys were systematically analyzed. Compared to the intracrystalline oxygen content, the oxygen content at W/Y2O3 phase boundaries is relatively higher. It can be found that the (110) crystal planes of W form coherent, semi-coherent, and non-coherent interfaces with different crystal planes of Y2O3. The weak interfacial bonding strength between W and Y2O3 phases results from relatively more oxygen impurities as well as more semi-coherent/non-coherent interfaces at phase boundaries compared with the inner W grains.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51822404 and 51574178) and the Science and Technology Program of Tian** (Grant No. 18YFZCGX00070), the Natural Science Foundation of Tian** (Grant No. 18JCYBJC17900) and the Seed Foundation of Tian** University (Grant Nos. 2018XRX-0005 and 2019XYF-0066).

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Authors and Affiliations

  1. Tian** Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tian** University, Tian**, 300072, China

    Weiqiang Hu, Qingshuang Ma, Zongqing Ma, Yuan Huang, Zumin Wang & Yongchang Liu

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  1. Weiqiang Hu
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  2. Qingshuang Ma
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Correspondence to Zongqing Ma.

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Hu, W., Ma, Q., Ma, Z. et al. Ultra-fine W–Y2O3 composite powders prepared by an improved chemical co-precipitation method and its interface structure after spark plasma sintering. Tungsten 1, 220–228 (2019). https://doi.org/10.1007/s42864-019-00021-w

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