کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7887863 | 1509791 | 2018 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Densification behavior and ablation property of C/C-ZrC composites prepared by chemical liquid vapor deposition process at temperatures from 800 to 1100â¯Â°C
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Chemical liquid vapor deposition (CLVD) process has got much attention because of its high efficiency and flexibility, but almost no reports are available in the fields of C/C-UHTCs preparation and the study of process parameters. In this work, CLVD-processed C/C-ZrC composites were fabricated at temperatures from 800 to 1100â¯Â°C, and the effects of temperature on the densification behavior and ablation property were discussed. Results displayed the mass gain, the deposition rate and the density uniformity were enhanced when the temperature increased from 800 to 900â¯Â°C, and thereafter they were reduced with the further arising temperature. Meanwhile, there were two different deposition modes due to the various temperatures. When the temperature was 900â¯Â°C, the sample possessed a good densification behavior, leading to a high density, great content of ZrC and homogenous distribution. These advantages promote a complete and dense ZrO2 coating on the sample surface during ablation, which plays as an obstacle for oxidizing species diffusion and heat transfer. Thus, the specimen prepared at 900â¯Â°C exhibited an outstanding anti-ablation property. However, the densification behavior was deteriorated with the further increasing temperature. Especially, when the temperature increased to 1100â¯Â°C, the composites had a poor density, low content of ZrC and bad dispersion of ceramics. As a result, a loose and discontinuous oxide coating was formed on the ablation surface, and the oxidation and mechanical corrosion were severe, suggesting a poor ablation resistance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 7, May 2018, Pages 7991-8004
Journal: Ceramics International - Volume 44, Issue 7, May 2018, Pages 7991-8004
نویسندگان
Qinchuan He, Hejun Li, Changcong Wang, Songwei Chen, Jinhua Lu,