PREPARATION OF TRANSPARENT MgAl2O4 CERAMICS BY PULSED ELECTRIC CURRENT SINTERING USING TWO-STEP HEATING METHOD

被引：1
|
作者：
Yen Ngoc Nguyen [1 ]
Hai Minh Le [1 ,2 ]
Tu Anh Dao [1 ]
Hung Ngoc Tran [3 ]
Tue Ngoc Nguyen [3 ]
Thang Hong Le [1 ]
Khanh Quoc Dang [1 ]
机构：
[1] Hanoi Univ Sci & Technol, Sch Mat Sci & Engn, 1 Dai Co Viet, Hanoi 10000, Vietnam
[2] Viettel Grp, Viettel Aerosp Inst, Lot D26, Hanoi 10000, Vietnam
[3] Hanoi Univ Sci & Technol, Sch Chem Engn, 1 Dai Co Viet, Hanoi 10000, Vietnam
来源：
ACTA METALLURGICA SLOVACA | 2021年 / 27卷 / 04期
关键词：
transparent ceramics; MgAl2O4; PECS; two-step sintering; SPINEL; POWDERS;
D O I：
10.36547/ams.27.4.1212
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Transparent MgAl2O4 ceramics were fabricated by pulsed electric current sintering (PECS) employing a 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 100 degrees C/min under an applied pressure of 100 MPa. The sintering process was conducted according to a two-step heating profile. At the first step, the temperature increased to 1050, 1100, and 1150 degrees C, followed by a dwell time of 60 min. The second-step sintering was carried out at 1300, 1350, and 1400 degrees C for 20 min. The transparent ceramics sintered at 1050 degrees C / 60 min - 1400 degrees C / 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 1150 degrees C / 60 min - 1400 degrees C / 20 min.
引用
收藏
页码：203 / 206
页数：4
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