Preparation of Transparent MgAl2O4 Spinel by Pulsed Electric Current Sintering Using Two-step Heating Method

Authors

  • Yen Ngoc Nguyen Hanoi University of Science and Technology https://orcid.org/0000-0002-2114-0761
  • Hai Minh Le Viettel Aerospace Institute, Viettel Group
  • Tu Anh Dao Hanoi University of Science and Technology
  • Hung Ngoc Tran Hanoi University of Science and Technology
  • Tue Ngoc Nguyen Hanoi University of Science and Technology
  • Thang Hong Le Hanoi University of Science and Technology
  • Khanh Quoc Dang https://orcid.org/0000-0001-9416-891X

DOI:

https://doi.org/10.36547/ams.27.4.1212

Keywords:

transparent ceramics, MgAl2O4, PECS, two-step sintering

Abstract

Transparent MgAl2O4 ceramics were fabricated by pulsed electric current sintering (PECS) employing two-step sintering mode. First, nanoscale MgAl2O4 powders were produced by solution combustion synthesis from hydrated nitrate compounds and urea. Subsequently, the synthesized powders were sintered by PECS with a heating rate of 100oC/min under an applied pressure of 100 MPa. The sintering process was conducted according to two-step heating profile. At the first step, the temperature increased to 1050, 1100, and 1150oC, followed by a dwell time of 60 min. The second-step sintering was carried out at 1300, 1350, and 1400oC for 20 min. The transparent ceramics sintered at 1050oC/ 60 min – 1400oC/ 20 min exhibited transmittance over 80% in infrared range. In addition, transparent samples presented a Vickers hardness up to 30 GPa for sintering mode of 1150oC/ 60 min – 1400oC/ 20 min.

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Published

2021-12-07

How to Cite

Nguyen, Y. N., Le, H. M., Dao, T. A., Tran, H. N., Nguyen, T. N., Le, T. H., & Dang, K. Q. (2021). Preparation of Transparent MgAl2O4 Spinel by Pulsed Electric Current Sintering Using Two-step Heating Method. Acta Metallurgica Slovaca, 27(4), 203–206. https://doi.org/10.36547/ams.27.4.1212

Issue

Vol. 27 No. 4 (2021): Acta Metallurgica Slovaca

Section

Research papers