Fabrication and properties of cobalt-reinforced alumina-matrix composites

被引：0

作者：

Ning, Jinwei

Zhang, Junji

Pan, Yubai

Quo, Jingkun

机构：

[1] State Key Lab. of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China

[2] Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, China

来源：

Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | 2002年 / 31卷 / SUPPL. 1期

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摘要：

The Al2O3/Co powder with different metal contents was fabricated in the In-situ selected reduction method by controlling the process of wet chemical route , and the Al2O3/Co bulk composite was prepared by hot pressure sintering. The final microstructure can be controlled properly adopting the process. At first, cobalt-nitrate was dissolved into alcohol and mixed with alumina powder by milling. Next, the powder mixtures were calcinated. The calcinated temperature was determined by thermogravimetry and differential thermal analysis (TG-DTA). Calcinated in air, the powder mixtures of cobalt oxide and alumina were reduced in hydrogen atmosphere., Finally, the reduced powder were sintered by hot pressing in Ar atmosphere at 1 450°C in 30MPa and then dense alumina/cobalt composites were obtained (p>97.7%). The bending strength and fracture roughness, were enhanced by 52% and 37% respectively compared with monolithic alumina. The powder micrograph was observed by TEM. Phase analysis of the synthesized powders and sintered composites was carried out by X-ray diffraction (XRD) analysis. Field emission scanning electron microscopy (FESEM) was used to observe the microstructure of crack propagation and rupture micrographs. The reinforced mechanism was also discussed.

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