The C/ C-SiC-ZrC composites were prepared by precursor impregnation and pyrolysis method (PIP)
using different mass ratio of PCS/ PZC as impregnant. The microstructure and the ceramic phase distribution of the C/
C-SiC-ZrC composites before and after ablation were examined. And the effect of SiC/ ZrC precursor ratio on the ab-
lation property of the C/ C-SiC-ZrC composites was analyzed. The results show that the mass ablation rate and linear
ablation rate of the C/ C-SiC-ZrC composites were decreased firstly and increased subsequently with the increasing of
the content of ZrC. The composite possessing the relatively best ablation performance was fabricated with the impreg-
nant with the mass ratio of PCS/ PZC =1 ∶3. After ablation on oxyacetylene flame with the surface temperature of 3
000℃, the mass ablation rate and linear ablation rate of the sample are -0. 65 mg/ s and 21 μm/ s, respectively. Too
much or less ZrC in SiC-ZrC multiphase ceramics is not favorable to the oxidation stability of the samples. Therefore,
appropriate ZrC may be better.