1. Schematic of the centrifugal spinning system and the preparation of ZrC fibers

2. FT-IR spectra of ZrC precursors with different ZrO(CH₃COO)₂ : C₁₂H₂₂O₁₁ ratios: (a) 4 : 1; (b) 4 : 1.2; (c) 4 : 1.5; and (d) ZrC precursor (with ZrO(CH₃COO)₂ : C₁₂H₂₂O₁₁= 4 : 1.5) after pyrolysis at 600 ℃

3. TG-DSC curves of the as-spun green fibers prepared from ZrC precursor with ZrO(CH₃COO)₂ : C₁₂H₂₂O₁₁=4 : 1.5

4. XRD patterns of ZrC fibers prepared from ZrC precursors with different ZrO(CH₃COO)₂:C₁₂H₂₂O₁₁ ratios after heat- treatment at temperature range from 1400 to 1600 ℃ for 2 h(a) 4 : 1.5 @1400 ℃; (b) 4 : 1.5 @1500 ℃; (c) 4 : 1.5 @1600 ℃; (d) 4 : 1.2 @1600 ℃; (e) 4 : 1 @1600 ℃

5. SEM images of ZrC fibers prepared from ZrC precursor with ZrO(CH₃COO)₂ : C₁₂H₂₂O₁₁=4 : 1.5((a) as-spun green fibers; (b) after heat-treatment at 600 ℃ and (c) after heat- treatment at 1600 ℃); and (d) TEM image of ZrC fibers after heat-treatment at 1600 ℃The insets in (a,b,c) are the corresponding local enlarged images; while the inset in (d) is the selected area electron diffraction (SAED) pattern of ZrC fibers

6. SEM images of ZrC fibers prepared from ZrC precursors with different ZrO(CH₃COO)₂ : C₁₂H₂₂O₁₁ ratios after heat-treatment at 2000 ℃ for 2 h(a, b) 4 : 1; (c, d) 4 : 1.2; (e, f) 4 : 1.5