Synthesis of dense NiZn ferrites by spark plasma sintering

被引:31
作者
Sun, JJ [1 ]
Li, JB [1 ]
Sun, GL [1 ]
Qu, WG [1 ]
机构
[1] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
关键词
sintering (spark plasma sintering; SPS); ferrites;
D O I
10.1016/S0272-8842(02)00064-0
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Dense NiZn ferrites were fabricated by spark plasma sintering (SPS) at 900 degreesC and 20 MPa in short periods. The powder was densified to greater than or equal to98% of the theoretical density by the SPS process. The SPS disks exhibited a higher saturation magnetization (Ms), up to 272 emu/cm(3), than did the disks sintered by the conventional process. A higher coercivity (Hci) was obtained when the green bodies were sintered by the SPS process for 5 min. A modest holding time is essential to obtain fine grain and uniformity in the SPS process. Secondary crystallization, inhomogeneous microstructure and intragranular pores were found as a result of the rapid sintering and relatively longer holding time in the SPS process. Infrared (IR) spectra were also measured in the range from 350 to 700 cm(-1) to study the efforts of the SPS process on NiZn ferrites. (C) 2002 Elsevier Science Ltd and Techna S.r.l. All rights reserved.
引用
收藏
页码:855 / 858
页数:4
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