Hybrid Ti₂AlC Bonded Diamond Composites Prepared by a Self-propagation Sintering Approach

Abstract

Ti, Al, graphite and diamond powders were used as raw materials to prepare Ti₂AlC matrixbonded diamond composite using self-propagating high-temperature synthesis (SHS) method. The effect of diamond size and content on the fabrication of Ti₂AlC-bonded diamond material was investigated. Results showed that Ti₂AlC matrix-bonded diamond composites could be obtained by SHS. The phase composition and microstructure of the Ti₂AlC-bonded diamond material were influenced by the diamond content and size. When the diamond (93 μm) additive amounts were 10% and 20%, the product phases included Ti₂AlC, TiC and Al3Ti. However, excess Ti and Al persisted in the sample that contained 30% diamond. Diamond bonded well with the matrix in the sample that contained 10% diamond. Moreover, addition of coarse diamond particles with sizes of 93 and 125 μm produced a mainly Ti₂AlC matrix. However, diamond adequately reacted with Ti to form TiC when finer diamond particles (5 and 10 μm) were used.

Keywords

titanium aluminum carbide / diamond / content / size / self-propagation high temperature sintering

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