US 11,807,582 B1
Silicon nitride ceramic sintered body and preparation method thereof
Lujie Wang, Lanzhou (CN); Zhuhui Qiao, Lanzhou (CN); Tongyang Li, Lanzhou (CN); Ziyue Wang, Lanzhou (CN); Yuan Yu, Lanzhou (CN); and Huaguo Tang, Lanzhou (CN)
Assigned to Lanzhou Institute of Chemical Physics, CAS, Lanzhou (CN); Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Yantai (CN); and Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing, Yantai (CN)
Filed by Lanzhou Institute of Chemical Physics, CAS, Lanzhou (CN); Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Yantai (CN); and Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing, Yantai (CN)
Filed on Jul. 7, 2023, as Appl. No. 18/348,425.
Claims priority of application No. 202210865969.X (CN), filed on Jul. 22, 2022.
Int. Cl. C04B 35/584 (2006.01); C04B 35/587 (2006.01); C04B 41/00 (2006.01); C04B 35/626 (2006.01)
CPC C04B 35/584 (2013.01) [C04B 35/6264 (2013.01); C04B 41/0054 (2013.01); C04B 41/0072 (2013.01); C04B 2235/3203 (2013.01); C04B 2235/5436 (2013.01); C04B 2235/5445 (2013.01); C04B 2235/666 (2013.01)] 15 Claims
 
1. A silicon nitride ceramic sintered body, wherein the silicon nitride ceramic sintered body has a content of a silicon nitride crystalline phase of not less than 98 wt %, a relative density of not less than 99%, a porosity of not larger than 1%, a grain boundary phase comprising Li, 0, N, and Si elements, and a total content of C, F, Al, Mg, K, Ca, Na and rare-earth metals elements of less than 0.1 wt %.