High-temperature ablation performance of Si₃N₄-Si₂N₂O-BN composites prepared using selective laser sintering

In this study, a Si₃N₄ radome with high-temperature ablation performance was successfully prepared using selective laser sintering (SLS). The results showed that cold isostatic pressing was beneficial for the densification of SLS-processed Si₃N₄-Si₂N₂O-BN ceramics and improved their high-temperature ablation resistance. The sintering aids formed a glass phase that covered the surface of the Si₃N₄ ceramics, effectively preventing further ablation. The mass ablation rate and linear ablation rate were 0.6 mg/s and 0.5 µm/s, respectively. This work combines the advantages of additive manufacturing with the adjustable performance of composites.