Zirconia fibres have excellent high temperature ablation resistance and have been widely used in ablative materials. In this paper, zirconia fibre was used for reinforcing the ablative composite materials to study the influence of zirconia fibre had upon the mechanical properties and the high temperature ablation properties of such composites. The results showed that the bending strength of the material was also good and reached a maximum of 13.05 MPa. After sintering at 1400°C, the bending strength was also great which could reach 13.05 MPa. In addition, the corrosion resistance of the composites was excellent and the oxygen-acetylene line ablation rate was 0.03 mm s −1 when the fibre content was 30 wt-%.

2. EXPERIMENTAL DETAILS 2.1. Experimental materials EPDM, 4045M, produced by Mitsui of Japan, the third monomer is ethylidenenorbornene (ENB), the content of 7.6 wt%, the ethylene content of 45 wt%. Zinc oxide, stearic acid, tetramethylthiuram disulfide (TMTD), benzothiazole disulfide (DM), liquid paraffin, sulfur and ATH are all produced by Sinopharm Chemical Reagent Co., Ltd. Fumed silica, the specific surface area was 200 m2/g, produced by Shanghai Aladdin Reagent Co., Ltd.. Para-aramid fibre, the length was 3 mm, produced by Shenzhen Fibre Valley Technology Co., Ltd.. Calcined kaolin,

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With the development of rocket and aerospace technology in recent decades, people have put forward higher requirements on the heat resistance and ablation performance of thermal protection materials. In this paper, zirconia fibre hybrid alumina fibre/boron phenolic (ZA/ BPF) ceramifiable composites, based on ceramic fillers of MgO, Al 2 O 3 , SiC and mica-modified boron phenolic resin matrix, were prepared with different hybrid fibre contents (5, 10, 15, 20, 25, 30 wt-%) by hot compression moulding. The result shows that fibre contents have little effect on the ablation resistance of composite materials which all have a low linear ablation rate below 0. 01 mm s −1 . When the fiber content is 25%, the ZA/BPF composite reaches the highest bending strength 48. 86 MPa and 15. 57 MPa before and after sintering respectively. It is showed by the SEM results that too high and too low fibre content would both lead to poor bonding between resin and fibre interfaces.

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