کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1565730 | 1514208 | 2013 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Oxidation rate of nuclear-grade graphite NBG-18 in the kinetic regime for VHTR air ingress accident scenarios
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Oxidation rate of nuclear-grade graphite NBG-18 in the kinetic regime for VHTR air ingress accident scenarios Oxidation rate of nuclear-grade graphite NBG-18 in the kinetic regime for VHTR air ingress accident scenarios](/preview/png/1565730.png)
چکیده انگلیسی
One of the most severe accident scenarios anticipated for VHTRs is an air ingress accident caused by a pipe break. Graphite oxidation could be severe under these conditions. In this work, the oxidation rate of NBG-18 nuclear-grade graphite was studied thermogravimetrically for different oxygen concentrations and with temperatures from 873 to 1873Â K. A semi-empirical Arrhenius rate equation was developed for the temperature range of 873-1023Â K. The activation energy of NBG-18 was 187Â kJ/mol and the order of reaction was 1.25. The penetration depth of oxidant was about 3-4Â mm for NBG-18 oxidized at 973Â K. Increased porosity and changes in external geometry became more prominent at higher temperatures from about 1173 to 1873Â K. The surface of oxidized NBG-18 was characterized by SEM, EDS, FTIR and XPS.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 438, Issues 1â3, July 2013, Pages 77-87
Journal: Journal of Nuclear Materials - Volume 438, Issues 1â3, July 2013, Pages 77-87
نویسندگان
Jo Jo Lee, Tushar K. Ghosh, Sudarshan K. Loyalka,