Polymer-derived SiBCN ceramics are well known for their outstanding thermal stability. Although they possess outstanding thermal stability, SiBCN ceramics are easily to decompose out Si3N4 and SiC crystalline phases at high temperature leading to thermal stability worsen. Here, to reduce the Si3N4 crystallization precipitation in SiBCN ceramics, the N contents are reduced from 25 to 8.09 wt%, 11.44 and 14.51 wt%, by adding polycarbosilane into polyborosilazane, respectively. The experimental results illustrated that the precipitation temperature of Si3N4 phase in modified S1-S3 ceramics increa...
