两步加热脉冲电流烧结法制备透明MgAl2O4尖晶石

IF 1.1 Q3 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Slovaca Pub Date : 2021-12-07 DOI:10.36547/ams.27.4.1212

Y. Nguyen, H. M. Le, Tu Anh Dao, H. N. Tran, T. Nguyen, Thang Hong Le, K. Dang

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引用次数: 1

摘要

采用脉冲电流烧结(PECS)两步烧结方式制备了透明MgAl2O4陶瓷。首先，以水合硝酸盐和尿素为原料，采用溶液燃烧合成法制备纳米级MgAl2O4粉体。随后，在100mpa的压力下，以升温速率为100oC/min的PECS烧结合成粉体。烧结过程按两步加热方式进行。第一步分别升温至1050、1100、1150℃，保温时间为60 min。第二步分别在1300、1350、1400oC下烧结20 min。在1050℃/ 60 min ~ 1400oC/ 20 min下烧结的透明陶瓷在红外范围内透光率超过80%。此外，在1150oC/ 60min - 1400oC/ 20min的烧结模式下，透明样品的维氏硬度高达30gpa。

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

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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来源期刊

Acta Metallurgica Slovaca METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

2.00

自引率

30.00%

发文量

审稿时长

12 weeks