公开(公告)号：US12012364B2

公开(公告)日：2024-06-18

申请号：US17264305

申请日：2020-07-10

申请人： CENTRAL SOUTH UNIVERSITY

发明人： Wei Sun ,  Zheng Peng ,  Xiang Xiong

IPC分类号： C04B35/56 ,  C04B35/626 ,  C04B35/645

CPC分类号： C04B35/5622 ,  C04B35/6261 ,  C04B35/6264 ,  C04B35/645 ,  C04B2235/3839 ,  C04B2235/3856 ,  C04B2235/3886 ,  C04B2235/422 ,  C04B2235/5436 ,  C04B2235/6562 ,  C04B2235/6565 ,  C04B2235/6567 ,  C04B2235/666 ,  C04B2235/77 ,  C04B2235/9669

摘要： A long-term ablation-resistant nitrogen-containing carbide ultra-high temperature ceramic with an ultra-high melting point is prepared as follows: preparing the HfC powder and the HfN powder according to a mass ratio of HfC:HfN=(1-7):1; uniformly mixing the HfC powder and the HfN powder with the carbon powder and the carbon nitride powder to obtain a mixed powder, wherein the amount of the carbon powder and the amount of the carbon nitride powder do not exceed 8.0 wt. % and 5.0 wt. %, respectively, of the mixed powder mass; and performing spark plasma sintering on the mixed powder to produce the ceramic with the ultra-high melting point, a density ≥98%, and a uniform C/N content distribution. The ultra-high temperature ceramic is suitable for ultra-high temperature ablation-resistant protection at ≥3000° C. The ceramic maintains a close to zero ablation rate and a continuously stable oxidation-resistant protective structure after ablation for 300 s.