期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 42, 期 4, 页码 1332-1340出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.12.002
关键词
Polymer-derived ceramics (PDCs); SiZrBOC ceramics; Oxidation behavior; Thermal stability; Sol-gel method
资金
- National Natural Science Foundation of China [51772061]
SiZrBOC ceramics prepared by sol-gel method exhibit excellent high-temperature resistance and oxidation resistance, with the addition of boron elements promoting the formation of Si-O-B bonds in the ceramics.
A new type of high-temperature-resistant SiZrBOC ceramics was prepared by sol-gel method using polymethylhydro siloxane (PMHS), boric acid (B(OH)(3)), and n-propyl zirconate (Zr(OPr)(4)) as raw materials. After hightemperature pyrolysis, the SiZrBOC precursor was transformed into a crystalline ceramic material with a yield of 89.5 wt%. Fourier infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA) were applied to characterize the polymer-ceramic conversion process and thermal behavior of ceramic precursors. According to the results, the addition of boron elements led to the formation of Si-O-B links in the system. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to study the phase composition and microstructure of SiZrBOC ceramics. Finally, the oxidation test at 1200 degrees C revealed that SiZrBOC ceramics with a boron/zirconium molar ratio of 2.5:1 exhibited the best oxidation resistance at a weight gain of 0.4 wt% only.
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