4.6 Article

Ethanol-Induced Flash Sintering of ZnO Ceramics at Room Temperature

Journal

MATERIALS
Volume 15, Issue 3, Pages -

Publisher

MDPI
DOI: 10.3390/ma15030862

Keywords

flash sintering; room temperature; ZnO; ethanol; strong electric field

Funding

  1. National Natural Science Foundation of China [52077118]
  2. Jiangxi Key Research and Development Program [20212BBE53025]
  3. Technology Project of State Grid Jiangxi Electric Power Supply Co., Ltd [52182020008Y]
  4. State Key Laboratory of New Ceramic and Fine Processing Tsinghua University [KFZD201903]

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This paper presents a method for flash sintering of ceramic materials at room temperature by applying an electric field and dropwise addition of ethanol. The method is simple, easy to control, and achieves high density ceramic materials with consistent initiation voltage.
Ceramic flash sintering with a strong electric field at room temperature is the most attractive method. This paper presents the flash sintering of ZnO ceramics at room temperature by the application of a 3-kV/cm electric field after a dropwise addition of ethanol. This method is simple and easy to control. The density of the specimen exceeded 96% after 30 s of sintering. No significant difference was observed in the initiation voltage of flash sintering with and without the dropwise addition of ethanol. Ethanol burns upon dropwise addition, causing a discharge to first occur far from the location of the dropwise addition, followed by glowing and heating up, which causes the temperature of the entire specimen to rise.

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