کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7886378 | 1509785 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Low temperature synthesis of pure phase TaB2 powders and its oxidation protection modification behaviors for Si-based ceramic coating in dynamic oxidation environments
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
To reveal the generation mechanisms of the Ta-Si-O glass ceramics layer in dynamic oxidation environments, a 40â¯wt% TaB2-SiC coating was prepared by liquid phase sintering method. To obtain pure phase TaB2 powders at lower temperature (1500â¯Â°C), excessive B2O3 powders were added in raw materials to eliminate the TaC byproduct phase. The hexagonal pure phase TaB2 powders own average particle size of about 386â¯nm. During the TGA dynamic oxidation tests, after the modification of 40â¯wt% TaB2, the initial weight loss temperature of the sample delayed by about 48%, while the weight loss percentage and rate in fastest weight loss zone decreased by about 61% and 53%, respectively. During oxidation, the generated Ta-oxides were peeled and carried away by the formed fluid SiO2 glass layer to form “Ta-oxides halation” at first, which results the dissolution of Ta-oxides in the SiO2 glass, thus forming the Ta-Si-O glass ceramics with dendritic structure. With the spread of the SiO2 glass layer and growth of the Ta-Si-O dendrite, the Ta-Si-O glass ceramics gradually cover on the surface of the SiO2 glass layer, forming the structure of Ta-Si-O/SiO2 double glass layer that is capable of sealing and arresting of microcracks.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 13, September 2018, Pages 15517-15525
Journal: Ceramics International - Volume 44, Issue 13, September 2018, Pages 15517-15525
نویسندگان
Xuanru Ren, Lifeng Wang, Peizhong Feng, Ping Zhang, Litong Guo, Xiaojun Sun, Hongsheng Mo, Ziyu Li,