Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第16卷    第9期    总第90期    2006年9月

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文章编号: 1004-0609(2006)09-1577-06
胞状结构NiFe2O4/Ni金属陶瓷的制备及性能
杨文杰, 周科朝, 李志友, 张雷

(中南大学 粉末冶金国家重点实验室, 长沙 410083)

摘 要:  采用结构功能化设计理念, 使用共挤压成形工艺制备具有胞状结构的NiFe2O4/Ni金属陶瓷坯体。试样在1 350 ℃的氮气气氛下进行烧结。 结果表明, 在构造胞状结构过程中, 有机添加剂起到了粉末流动载体及对坯件的保形作用。 对所得试样导电性能及力学性能的分析结果表明, 与同等Ni含量NiFe2O4/Ni均匀体试样相比, 胞状结构试样的电导率有显著提高且与富Ni层中的金属含量有关; 虽然胞状结构材料的抗弯强度高于同等金属含量NiFe2O4/Ni均匀体, 但随着富Ni层金属含量的提高材料的抗弯强度呈下降趋势。

 

关键字:  NiFe2O4; 金属陶瓷; 共挤压; 电导率; 抗弯强度

Preparation and properties of NiFe2O4/Ni cermets with celluar structure
YANG Wen-jie, ZHOU Ke-chao, LI Zhi-you, ZHANG Lei

State Key Laboratory of Powder Metallurgy, Central South University,
 Changsha 410083, China

Abstract: The NiFe2O4/Ni cermets with cellular microstructure were prepared by the co-extrusion forming process based on the concept of functionally design. The microstructure, conductivity and mechanical properties were investigated using the samples sintered at 1 350 ℃ in N2 atmosphere. The results indicate that the chosen additive is the carrier of powder and has a good effect of holding shape in co-extrusion process. The conductivity of the sample with cellular microstructure is higher than that of the conventional material with similar Ni content, and the conductivity increases with the increasing Ni content of rich metal layers. Although the bending strength of the sample with cellular microstructure is higher than that of conventional material with similar Ni content, it decreases with the increasing Ni content of rich metal layers.

 

Key words: NiFe2O4; cermet; co-extrusion; conductivity; bending strength

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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