کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10629392 | 991063 | 2016 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Fundamental understanding of water vapor effect on SiOC evolution during pyrolysis
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
In this study, fundamental difference of polysiloxane derived SiOC from pyrolysis conditions with and without water vapor presence is evaluated from composition and microstructure points of view. Based on the composition analysis, it can be derived that the presence of water vapor preferentially removes the free carbon in the SiOC matrix. Because of the less dominant presence of carbon, SiC formation is suppressed; some SiO2 is reduced to Si. After the pyrolysis, SiO2 nanodomains can be removed and pores form with the HF etching to form highly porous microstructures. The graphitic layers form a connecting network encapsulating other phases present: SiO2, Si, and SiC; SiOC co-exists with the graphitic network. Without the constraint of the SiOC matrix and other crystalline phases, the graphitic layers can exfoliate and form disorganized single layers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 36, Issue 3, February 2016, Pages 411-422
Journal: Journal of the European Ceramic Society - Volume 36, Issue 3, February 2016, Pages 411-422
نویسندگان
Kathy Lu, Jiake Li,