Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 34, Issue 15, Pages 3579-3589Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2014.05.039
Keywords
Dimethylaminoborane; Polymer derived ceramic; SiBCN; High temperature resistant
Categories
Funding
- National Natural Science Foundation of China [50802079]
- Natural Science Foundation of Fujian Province of China [2011J01330]
- Scientific and Technological Innovation Platform of Fujian Province [2006L2003]
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A novel polyborosilazane (PBSZ) precursor was synthesized by the reaction of copolysilazane (CPSZ) with dimethylaminoborane (DMAB). The resultant PBSZs were characterized by FT-IR and NMR spectroscopy. It was found that both, B-H and N-H bonds of DMAB, react with CPSZ leading to boron containing copolysilazanes. The polyborosilazanes were pyrolyzed at 900 degrees C in argon and the precursor-to-ceramic transformation was studied by TG-MS and FT-IR spectroscopy. The modification of CPSZ with DMAB enhances the cross-linking of the resulting PBSZ, which increases the final ceramic yield from 57.8% to 77.5-80.0%. Finally, the ceramics obtained at 900 degrees C were subsequently annealed at different temperatures ranging from 1200 to 1800 degrees C. The heat-treated products were characterized by X-ray powder diffraction and electron microscopy. Accordingly, the resulting SiBCN ceramics exhibit significantly enhanced high-temperature-resistance with respect to decomposition and crystallization as compared with boron-free CPSZ-derived SiCN ceramics. TEM results support that the thermal stability is due to the segregation of a BN(C) phase as interlayer between Si3N4 nanocrystals formed during heat-treatment of SiBCN at T > 1500 degrees C. (C) 2014 Elsevier Ltd. All rights reserved.
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