کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10632079 | 992382 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and high-pressure sintering of (W0.5Al0.5)C
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
A new solid solution of Al in WC, which can be expressed by the chemical formula (W0.5Al0.5)C, has been synthesized directly by reaction milling (RM) of a W0.5Al0.5 alloy and the proper amount of carbon. The total reaction time is about 50 h. The ESEM photograph shows that the prepared (W0.5Al0.5)C powders are spherical, and the average particle size is about 40 nm. (W0.5Al0.5)C has been identified to crystallize in the hexagonal space group P-6m2 (No.187) and belongs to the WC structure type. The lattice parameter of (W0.5Al0.5)C is calculated to be a = 2.908(1) Ã
, c = 2.836(1) Ã
. This nanocrystalline powder can be well sintered at the high temperature (1600 °C) under the high pressure (4.5 GPa), and the relative density reaches 99.1%. The hardness of the sintered (W0.5Al0.5)C is tested to be 1500 ± 50 kg mmâ2, while the density is about 9.417 ± 0.003 g cmâ3, which is far lower than that of WC.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 40, Issue 4, 20 April 2005, Pages 701-707
Journal: Materials Research Bulletin - Volume 40, Issue 4, 20 April 2005, Pages 701-707
نویسندگان
Junmin Yan, Xianfeng Ma, Wei Zhao, Huaguo Tang, Changjun Zhu, Shuguang Cai,