Formation Mechanism of TaC by Tantalum-contained Resin Precursor

doi:10.3724/SP.J.1077.2007.00973

Abstract

Abstract: C/C-TaC composites prepared by liquid precursors are promising in improving the ablation properties of C/C composites. The formation mechanism of TaC by tantalum-contained resin precursor was investigated through the analysis of components and morphologies of tantalum-contained resin after different heat treatment by XRD and SEM together with the DSC-TG results of tantalum-contained solution. The results show that tantalum-contained solution promotes the solidification of resin. Treated at 100℃, TaF₅ will hydrolyze into TaO₂F and the resin will solidify. Treated at 800℃ in vacuum atmosphere, part of TaO₂F in tantalum-contained resin will decompose into Ta₂O₅ solid and TaF₅ gas. Then, Ta₂O₅ will be reduced and compounded by carbon into TaC with fine sizes at 1000℃. The lossof tantalum can be controlled by prolonging treatment time at lower temperatures (room temperature --100℃) and introducing anhydrous ammonia into the solution.

Key words: tantalum-contained resin, TaC, formation mechanism

CLC Number:

TB332

LI Jiang-Hong,ZHANG Hong-Bo,XIONG Xiang,XIAO Peng,ZHAO Lei,HUANG Bai-Yun. Formation Mechanism of TaC by Tantalum-contained Resin Precursor[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.00973.

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Formation Mechanism of TaC by Tantalum-contained Resin Precursor

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