Effects of Carbon Sources on Structure and Properties of TaC Ceramic Powder Prepared by Polymer Derived Ceramics

Polymer derived ceramic is one of the effective methods for producing ultra-high temperature ceramics and powders, but effect of source material type on precursor cross-linking degree and ceramic yield has rarely been reported.Here, TaC precursors were synthesized using two carbon sources and poly-tantalumoxane (PTO).Phase composition and microstructure of TaC ceramic powders from different carbon sources, tantalum/carbon mass ratios, and pyrolysis temperatures were characterized.It was found that PF-3 resin with C=C was effective in promoting the cross-linking of PTO and increasing the ceramic yield.When the mass ratio of PTO to PF-3 Resin was 1 : 0.25 and PTO to 2402 Resin was 1 : 0.4, TaC ceramic powders could be obtained at 1400 ℃ without residue Ta 2 O 5 .Ceramic yields of ceramic powders were 54.02% and 49.64%, and the crystal sizes were 47.2 and 60.9 nm, respectively.Therefore, PF-3 resin is able to reduce crystal size while increasing ceramic yield, but has less impact on the powder