학술논문
Synthesis and some properties of Ti[sub 3]SiC[sub 2] by hot pressing of titanium, silicon, and carbon powders Part 1 – Effect of starting composition on formation of Ti[sub 3]SiC[sub 2] and observation of Ti[sub 3]SiC[sub 2] crystal morphology.
Document Type
Article
Author
Source
Subject
*TITANIUM
*SILICON
*MICROSTRUCTURE
*TRANSMISSION electron microscopy
*ELECTRON microscopy
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Language
ISSN
0267-0836
Abstract
Dense Ti[sub 3]SiC[sub 2] bulk ceramic was synthesised by hot pressing of elemental titanium, silicon, and carbon powders. The effects of starting composition of the powders on the synthesis of pure Ti[sub 3]SiC[sub 2 ]were examined. Phase identification was carried out by X-ray diffraction. Silicon content in the starting composition played an important role in formation of the final constituent phases in the composite. It was difficult to obtain the pure phase Ti[sub 3]SiC[sub 2] because other thermodynamically stable reaction products such as TiC, TiSi[sub 2], or Ti[sub 5]Si[sub 3 ]were always present together with Ti[sub 3]SiC[sub 2]. The microstructure of samples was examined using scanning electron microscopy and transmission electron microscopy. Observations showed that the Ti[sub 3]SiC[sub 2] matrix was composed of elongated, platelike, and equiaxial grains. It is suggested that the hexagonal crystal Ti[sub 3]SiC[sub 2] exhibits anisotropic grain growth behaviour. The relative growth rates on different planes, therefore, endow Ti[sub 3]SiC[sub 2] with several morphologies. [ABSTRACT FROM AUTHOR]