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.
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, 2007
, 22(5)
: 973
-978
.
DOI: 10.3724/SP.J.1077.2007.00973
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