Sintering characteristics and grain growth behavior of MgO nanopowders by spark plasma sintering

被引：44

作者：

Zhang, Yongfen ^{[1
,2
]}

Song, Aijun ^{[3
]}

Ma, Deqiang ^{[1
]}

Zhang, Xinyu ^{[1
]}

Ma, Mingzhen ^{[1
]}

Liu, Riping ^{[1
]}

机构：

[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China

[2] Hebei Vocat & Tech Coll Bldg, Qinhuangdao 066004, Peoples R China

[3] Hebei Normal Univ Sci & Technol, Phys Chem Coll, Qinhuangdao 066004, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 608卷

关键词：

Magnesia ceramics; Spark plasma sintering; Grain growth; Microstructure; Microhardness; MECHANICAL-PROPERTIES; DIELECTRIC PROPERTY; DENSIFICATION MAPS; GLASS-CERAMICS; MICROSTRUCTURE; COMPOSITES; NANO; CRYSTALLIZATION; DEFORMATION; FABRICATION;

D O I：

10.1016/j.jallcom.2014.04.148

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The densification of nanocrystalline MgO powders with average particle size of 60 nm by spark plasma sintering (SPS) was investigated within the temperature range of 900-1420 degrees C, an applied pressure of 30 MPa, and duration ranges of 3-8 min. The relative density of these sintered specimens continuously increased with increasing sintering temperature, and the value reached an asymptote at 1420 degrees C. The grain size slowly increased at low sintering temperatures (900-1200 degrees C) and rapidly increased at high sintering temperatures (1200-1420 degrees C). The grain growth of the MgO nanopowders during SPS was investigated based on classical phenomenological kinetic theory. The analysis of the grain growth kinetics showed that the grain growth exponent varied at different sintering temperatures, whereas the activation energy for grain growth at low sintering temperatures was smaller than that at high sintering temperatures, and the maximum value was achieved at 1200 degrees C. The microhardness of the sintered specimens at different temperatures was tested and the results were discussed according to the microstructure characteristics analysis of the sintered specimens at different temperatures. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：304 / 310

页数：7

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