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Dilatometric study of Ti3SiC2 synthesis from TiC/Si starting powders
2008 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this study MAX phase ceramics were obtained by pressurless heat treatment of TiC and Si powders. The aim of the project was to attain a better understanding about the reaction mechanisms that takes place in the system. Different initial ratios with silicon excess in the TiC/Si powder mixture were used to synthesize Ti3SiC2. Pellets from each powder were heat treated at 1500ºC in Argon atmosphere dilatometer without holding times. The sintering environment effect was evaluated using a graphite furnace and a graphite-free furnace (Al2O3) in the dilatometer for the heat treatment. The chemical reaction mechanisms were investigated according with the volume changes obtained from graphite-free furnace dilatometric curves and the respective temperatures where such changes took place. After heat treatment the samples were evaluated by scanning electron microscopy (SEM) and x-ray diffraction (XRD). It was obtained 70Vol% of Ti3SiC2 and 15Vol% of SiC for 3TiC:2,2Si initial ratio sintered at 1500ºC. It was found that there is an effect of the carbon in the temperature synthesis. A chemical reactions sequence was suggested according with phases present dependent on temperature treatment.

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Keyword [en]
Keyword [sv]
URN: urn:nbn:se:ltu:diva-57101ISRN: LTU-PB-EX--08/049--SELocal ID: dcd4062e-a7eb-4a7d-9e49-db0d036b5c31OAI: diva2:1030488
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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