Abstract
This chapter is a review of research on the hydrothermal oxidation of powdered and bulk Ti3SiC2. The interaction of Ti3SiC2 powders with H2O was investigated at 500–700°C under a hydrostatic pressure of 50MPa. During hydrothermal oxidation, titanium and silicon were selectively oxidized and extracted from Ti3SiC2, resulting in the formation of TiO2, SiO2 and disordered carbon, and this was attributed to the weak bonding between Ti–Si atomic layers and the layered structure of the matrices. Studies on Ti3Si09Al01C2 powders demonstrated that this hydrothermal oxidation was influenced by aluminum dopant, which delayed the phase transformation from anatase to rutile, and promoted the formation of carbon, the crystallization of silica and decomposition of the matrix. Hydrothermal oxidation of bulk Ti3SiC2 was investigated at 500 to 700°C under a hydrostatic pressure of 35MPa in continuous water flow, which obeyed a linear time-law. The oxidation was limited at 500–600°C and accelerated at 700°C due to the formation of cracks in oxides. Owing to the high solubility of silica in hydrothermal water, the resulting oxide layers only consisted of titanium oxides and carbon.
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