4.7 Article

Influence of powder characteristics on cold sintering of nano-sized ZnO with density above 99 %

期刊

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 4, 页码 2648-2662

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.11.007

关键词

Cold sintering; FAST/SPS; Powder agglomeration; Parameters' optimization; Grain boundary

资金

  1. German Research Foundation or DFG [GU993/10]
  2. University of Engineering and Technology, Lahore, Pakistan

向作者/读者索取更多资源

This study optimized cold sintering parameters for ZnO to achieve high density and small grain size. The research also revealed the impact of powder agglomerates and inter particle friction on densification behavior, as well as the influence of external atmosphere during the process.
Cold sintering parameters such as, temperature, pressure, aqueous phase, heating rate and dwelling time has been widely discussed in the literature but the role of starting powder with respective microstructure development is mostly overlooked. There is a need for understanding the effect of powder agglomerates and the role of inter particle friction on the densification behavior during cold sintering process. Present study encompasses investigation and optimization of these parameters for ZnO which enabled > 99 % of relative density with grain sizes below 200 nm. Additionally, role of external atmosphere was also studied to investigate its impact on densification during the process. All cold sintering experiments were carried out in a FAST/SPS device for studying aqueous phase evaporation and ensuring the reproducibility of process parameters. Microstructure characterization (scanning and transmission electron microscopy) showed - without any post heat treatment- defect free grain boundary structure opposite to what documented by previous studies.

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