Abstract
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 increased to 1800 °C which was higher than that of S0 ceramics (1600 °C). The results indicated that the crystalline precipitation of Si3N4 in SiBCN ceramics can be suppressed at a high-temperature environment via declining N content, which may provide a new strategy for decreasing carbothermal reduction. In addition, the original SiBCN ceramic had a weight change of 31.7% at T > 1800 °C, while the weight change of modified SiBCN ceramics significantly reduced to 15.7 ~ 19.5%, which attributed to the decrease in carbothermal reduction.
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The authors sincerely thank navi-sci.cn for its contributions to assistance with the test.
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This work is supported by the National Natural Science Foundation of China (Grant No. 52173306), the National Key Research and Development Program of China (Grant No. 2021YFB3702304-4) and the National Science and Technology Major Project (Grant No. J2019-VI-0017–0132).
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Prime Novelty Statement:The carbothermal reduction in SiBCN ceramics at high temperatures severely limits their use in aerospace applications. This paper presents a simple and effective method to improve thermal stability by reducing the elemental N content of derived SiBCN ceramics. Meanwhile, the microstructural evolution and high-temperature behavior of SiBCN ceramics with different elements contents is investigated systematically. The experimental result demonstrates that the carbothermal reduction (mainly via 2C + 2Si–N → 2SiC + N2) can be hindered via decreasing the elemental N contents in the SiBCN ceramics. This is because the dehydrocoupling degree between Si–H and N–H is significant reduced in pyrolysis process, thus decreasing precipitation of Si–N at high-temperature environment, which may provide a new strategy for decreasing carbothermal reduction.
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Wang, T., Chen, S., Zhao, Z. et al. Improved thermal stability of SiBCN ceramics by lowering nitrogen content. J Mater Sci 58, 1013–1025 (2023). https://doi.org/10.1007/s10853-022-08027-5
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DOI: https://doi.org/10.1007/s10853-022-08027-5