QIU Haipeng, MA Xin, LIANG Yanyuan, CHEN Mingwei, XIE Weijie, WANG Xiaomeng, ZHAO Yuliang

(1. AVIC Composite Technology Center, AVIC Manufacturing Technology Institute, Beijing 101300, China; 2. National Key Laboratory of Advanced Composites, Beijing 101300, China)

Abstract: Continuous nitride fiber reinforced nitride matrix composite has been recognized as a promising microwave transparent radome material. 2D silicon nitride fiber fabric reinforced silicon boronitride ceramic composites were prepared through polyborosilazane precursor infiltration pyrolysis routine using polyborosilazanes (PBSZs) as the precursor of SiBN. Properties of the composites at elevated temperatures were measured, including strength, dielectric constant and loss tangent. After pyrolysis at above 900 °C in ammonia atmosphere, C element in the PBSZ precursor was effectively removed. The ceramic yield was 53-56 wt.%, with contents of C, Si and B to be less than 0.3 wt.%, 38.11 wt.% and 7.35 wt.%, respectively.

Key words: continuous fiber reinforced ceramic matrix composite, precursor infiltration pyrolysis, dielectric property, mechanical property