XRD patterns and the detailed XRD patterns of samples synthesized at the mass ratio of the salt to 3Ti/Al/2C powders of 10:1 at temperatures ranging from 700 to 1000 °C for 2 to 5 h. it can be seen that the TiAl, Ti3Al, and TiC phases are initially formed when the starting materials of Ti, Al, and acetylene black are heated in NaCl‒KCl molten salt at 700 or 750 °C holding for five h. The absence of acetylene black in the product is due to the rinsing of boiled deionized water after the reaction. As the temperature increases to 800 °C, the sample consists of TiAl, Ti3AlC2, Ti2AlC, TiC, and a small amount of Ti3Al phases, as shown in detailed XRD patterns in Fig. 3(B). It is deduced that Ti3Al phase may react with C to form Ti3AlC2 and TiAl phase react with TiC to form Ti2AlC at 800 °C, respectively. As the temperature increases to 850 °C, the amount of TiAl and Ti3Al reduces while Ti3AlC2, Ti2AlC, and TiC increase, as shown in curve d. As the temperature further increases to 900 °C, the phases of TiAl and Ti3Al disappear, those of Ti3AlC2 and TiC are still observed, and Ti2AlC becomes the main phase as shown in curve e, which may be due to the more reaction between TiAl and TiC to form Ti2AlC phase. When the temperature reaches 950 °C, the desired Ti3AlC2 as the main phase and a few TiC as impurity phase are obtained as shown in curve f. It can be concluded that the Ti2AlC phase further reacts with the TiC phase to form Ti3AlC2. Therefore, Ti3AlC2 is successfully synthesized from 3Ti/Al/2C starting elemental powders without ball milling in NaCl‒KCl molten salt at 950 °C for five h.
Furthermore, when the temperature is elevated to 1000 °C just holding for two h, as shown in Fig. 3 curve g, the obtained sample is the same as that synthesized at 950 °C for five h. This evidence reveals that high-content Ti3AlC2 is synthesized at the mass ratio of the salt to 3Ti/Al/2C powders of 10:1 at 950 °C for five h or 1000 °C two h. In addition, the formation of the Ti3AlC2 is dramatically influenced by temperature, and a higher temperature is preferable for the preparation of Ti3AlC2 powder. If you are looking for high quality, high purity, and cost-effective Titanium Aluminum Carbide, or if you require the latest price of Titanium Aluminum Carbide, please feel free to email contact mis-asia.
