US 12,012,364 B2
Long-term ablation-resistant nitrogen-containing carbide ultra-high temperature ceramic with ultra-high melting point and application thereof
Wei Sun, Changsha (CN); Zheng Peng, Changsha (CN); and Xiang Xiong, Changsha (CN)
Assigned to CENTRAL SOUTH UNIVERSITY, Changsha (CN)
Appl. No. 17/264,305
Filed by CENTRAL SOUTH UNIVERSITY, Changsha (CN)
PCT Filed Jul. 10, 2020, PCT No. PCT/CN2020/101425
§ 371(c)(1), (2) Date Jan. 29, 2021,
PCT Pub. No. WO2021/103560, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 201911204418.3 (CN), filed on Nov. 29, 2019.
Prior Publication US 2022/0009838 A1, Jan. 13, 2022
Int. Cl. C04B 35/56 (2006.01); C04B 35/626 (2006.01); C04B 35/645 (2006.01)
CPC C04B 35/5622 (2013.01) [C04B 35/6261 (2013.01); C04B 35/6264 (2013.01); C04B 35/645 (2013.01); C04B 2235/3839 (2013.01); C04B 2235/3856 (2013.01); C04B 2235/3886 (2013.01); C04B 2235/422 (2013.01); C04B 2235/5436 (2013.01); C04B 2235/6562 (2013.01); C04B 2235/6565 (2013.01); C04B 2235/6567 (2013.01); C04B 2235/666 (2013.01); C04B 2235/77 (2013.01); C04B 2235/9669 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A long-term ablation-resistant nitrogen-containing carbide ceramic, wherein a density of the long-term ablation-resistant nitrogen-containing carbide ceramic is greater than or equal to 99.8%, and a C/N content distribution is uniform, and wherein the long-term ablation-resistant nitrogen-containing carbide ceramic is prepared by the following steps:
step 1:
preparing a HfC powder and a HfN powder according to a mass ratio of HfC:HfN=(1-7):1, uniformly mixing the HfC powder and the HfN powder with a carbon powder and a carbon nitride powder to obtain a mixed powder, wherein an amount of the carbon powder is greater than 0 wt. % and does not exceed 8.0 wt. % of a mass of the mixed powder, and an amount of the carbon nitride powder is greater than 0 wt. % and does not exceed 5.0 wt. % of the mass of the mixed powder; and
step 2:
performing a spark plasma sintering on the mixed powder obtained in step 1 to produce the long-term ablation-resistant nitrogen-containing carbide ceramic, wherein conditions of the spark plasma sintering re: a temperature in a sintering furnace is 1500-2400° C., a holding time is 5-60 minutes, a heating rate is 5-150° C./min, a cooling rate is 5-150° C./min, a pressure is 20-60 Mpa, and a vacuum degree is less than 5 Pa.