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| To improve the properties and structures of products, especially for those employed at high temperatures, ternary layer carbide Ti3SiC2 was found to be a novel material which combines many of the best attributes of both metals and ceramics, such as low density (4.53 g/cm3), high melting point (about 3000 ℃), high toughness, electrically and thermally conductive, machinability and resistant to thermal shock. In this paper, Ti3SiC2 synthesized at room temperature was experimentally investigated by mechanical alloying (MA) method. It was found that small amounts of granules with diameters of about 1 cm were coexisted with powders in the as-obtained products. After being ball milled for 7 hours, the contents of Ti3SiC2 in the powders and granules reached 83.6 wt% and 89.8 wt%, respectively. The fracture surface of Ti3SiC2 granules with the feature of “birds nest” was observed. For MA process that gives a specific state of alloying, the relationship of equivalency between MA-speed and MA-time was expressed, indicating that the supplied energy was being accumulated and transferred during MA. |
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| Keywords:Ti3SiC2;mechanical alloying;fracture surface;energy transfer |
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