A dense amorphous SiBCN(O) ceramic prepared by simultaneous pyrolysis of organics and inorganics

作者：Tang, Baojun^*; Zhang, Yue; Hu, Shujuan; Feng, Bo

来源：Ceramics International, 2016, 42(4): 5238-5244.

DOI：10.1016/j.ceramint.2015.12.050

• SiBCN(O) ceramic
• Polycarbosilane
• Amorphous
• Dense
• Pyrolysis

Utilizing active function groups and radicals of polymers (polycarbosilane) to react with a mixture of organics (urea) and inorganics(boric acid) during polymer to ceramic conversion process, a novel SiBCN(O) ceramic was successfully prepared via hot-pressing from 380 to 700 degrees C combined with following pyrolysis at 1400 degrees C for 2 h in nitrogen atmosphere. The prepared SiBCN(0) ceramic with a low open porosity of similar to 4%, which maintained amorphous structure still. Experimental results confirmed that the inorganic network of SiBCN(0) amorphous ceramic was constructed by Si-C, Si-N, Si-O, B-N, and B-O bonds. Pyrolysis product BN served as active filler in densification process of the SiBCN (O) ceramic. Additionally, the introduced oxygen from boric acid could be well controlled and thus effectively improved the densification process of the ceramic.

• 出版日期2016-3
• 单位北京航空航天大学