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

页码：203 / 206

页数：4

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