针对高超音速飞行器、可重复使用运载器和下一代火箭发动机等超高温使用环境的工况要求,提出在2DC/SiC复合材料体系中引入耐超高温相ZrB2.采用先驱体转化法制备了不同ZrB2含量的2DC/SiC-ZrB2新型复合材料,考察了ZrB2含量对材料力学性能、微观结构和抗烧蚀性能的影响.结果表明,材料的力学性能(弯曲强度和弯曲模量)随着材料中ZrB2含量的增加有一定的下降,材料的抗烧蚀性能明显提高.其中含ZrB2体积分数为19.4%的试样弯曲强度达到242.6 MPa,弯曲模量为37.1 GPa;经氧乙炔焰烧蚀考核90 s后,试样表面温度达到2329℃,线烧蚀率为0.015 mm/s,质量烧蚀率为0.005 g/s.
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