抄録
Combustion synthesis process is attracted as new synthesizing technology of TiAI intermetallic compound. However, since the synthesized products tend to be heterogeneous and by-products such as TiAl3 or α, β Ti-Al solid solution are synthesized in addition to TiAl, homogeneous and superior material is not obtained yet. To realize combustion synthesis of the compound, control conditions of microstructure and synthesized phase should be established. In this paper, a numerical model of TiAl combustion synthesis is driven, and combustion behavior and phase control condition are investigated. The numerical analysis is performed by solving the model equations with finite differential method.
From the calculation, the combustion behavior and the compound formation behavior are able to be simulated. At first TiA13 is formed, secondly Ti-Al solid solution is synthesized. TiAl is formed by reaction between the both compounds. The synthesis process and the synthesized phase are affected by combustion temperature. In case that the temperature is low, the formation reaction of TiAl is inferiority and the synthesized products become to be TiAl3 and Ti-Al solid solution. In case that the combustion temperature is high, TiAl is synthesized. Same result is able to be obtain from the experiment of the TiAl synthesis. TiAl is detected in a sample that the temperature is high, and for the low temperature sample TiAl phase is not found. Therefore, the combustion temperature is important for controlling of the synthesized phases, and it is found that the temperature should be control accurately to obtain the homogeneous and superior compound.
