کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10155369 | 1666349 | 2018 | 30 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhanced mechanical properties of W-doped Nb4AlC3 ceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The W-doped Nb4AlC3 ceramics [(Nb1-xWx)4AlC3, xâ¯=â¯0-0.0375] were successfully fabricated by in-situ reactive hot-press-aided method using elemental niobium, aluminum, graphite and tungsten powders. The XRD results suggest that the matrix phase (Nb1-xWx)4AlC3 and the second phase (Nb1-xWx)C were simultaneously formed when W was added. The SEM images show that (Nb1-xWx)C is dispersed in the W-doped Nb4AlC3 ceramics matrix. The mechanical properties of Nb4AlC3 were greatly enhanced by W doping. Typically, the (Nb0.975W0.025)4AlC3 exhibits the highest flexural strength (483â¯Â±â¯21â¯MPa), fracture toughness (8.5â¯Â±â¯0.3â¯MPaâ
m1/2) and Youngâ²s modulus (382â¯Â±â¯18â¯GPa) at room temperature (RT), which are increased by 59%, 15% and 30%, respectively, compared with the present Nb4AlC3. The Vickers hardness of (Nb0.9625W0.0375)4AlC3 (4.8â¯Â±â¯0.2â¯GPa) is 92% higher than that of Nb4AlC3. The (Nb0.975W0.025)4AlC3 also retains a high flexural strength of 344â¯Â±â¯4â¯MPa at 1400â¯Â°C (71% of RT value), which is much higher than the RT flexural strength (303â¯Â±â¯22â¯MPa) of the present Nb4AlC3. The strengthening effect is attributed to the solid solution of W and the incorporation of the second phase (Nb1-xWx)C. The excellent mechanical properties endow the W-doped Nb4AlC3 ceramics as promising high-temperature structural materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 16, November 2018, Pages 19135-19142
Journal: Ceramics International - Volume 44, Issue 16, November 2018, Pages 19135-19142
نویسندگان
Ping Cai, Qiming He, Xishi Wu, Xuejian Liu, Yan Liu, Jie Yin, Yihua Huang, Zhengren Huang,