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

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research 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

引用次数: 1

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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两步加热脉冲电流烧结法制备透明MgAl2O4尖晶石

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。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.