✦ LIBER ✦

Preparation, structure, and properties of Cr2N reinforced Al2O3 composites

✍ Scribed by Yaogang Li; Lian Gao; Jing Sun

Publisher: Elsevier Science
Year: 2006
Tongue: English
Weight: 298 KB
Volume: 37
Category: Article
ISSN: 1359-8368
DOI: 10.1016/j.compositesb.2006.02.005

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✦ Synopsis

Nanosized a-Al 2 O 3 and CrN powders were mixed in calculated proportion and homogenized by ball milling. Cr 2 N reinforced Al 2 O 3 composites were prepared by hot pressing of nano CrN-Al 2 O 3 powders. Dense sintered bodies were obtained by hot pressing at 1400-1550 8C and 30 MPa for 60 min. X-ray diffraction (XRD) analysis indicated that the CrN converted to Cr 2 N during the sintering process. Microstructures of the composites were studied by field emission scanning electron microscopy (FE-SEM). It was found that Cr 2 N particles were uniformly dispersed in the Al 2 O 3 matrix. The bending strength of the Al 2 O 3 -Cr 2 N composite with the addition of 12.97 vol% Cr 2 N hot pressed at 1400 8C reached 848 MPa, and the fracture toughness of samples was over 4 MPa m 1/2 .

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