کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10625033 | 989613 | 2014 | 24 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of excess boron oxide on the formation of tungsten boride nanocomposites by mechanically induced self-sustaining reaction
ترجمه فارسی عنوان
اثر اکسیدهای بور بر روی تشکیل نانوکامپوزیت های بورید تنگستن بواسطه واکنش خودکشی ناشی از مکانیک
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
چکیده انگلیسی
The influence of the type of reducing agent, milling time and excess boron oxide on the formation of tungsten boride nanocomposites by mechanically induced self-sustaining reaction was studied. The powder mixtures were mechanically activated using a high-energy planetary ball mill under two distinct experimental conditions. In the first manner, a mixture of tungsten trioxide, boron oxide and graphite with the stoichiometric composition was milled for different times. In the second approach, a mixture of tungsten trioxide, boron oxide and elemental magnesium with a molar ratio of 2:x:y (with x=2.5-6.25 and y=13.5-24.75) was activated for 1 and 30Â h. In the presence of 30-50Â wt% excess boron oxide, WB was formed during milling. Further increasing the boron oxide content to 150Â wt% led to a significant change in the mechanochemical behavior of the system so that WB and W2B5 became more dominant after 1Â h of milling. During leaching in 18% HCl aqueous solution, MgO was completely removed and consequently tungsten boride nanocomposites with high phase purity were obtained. According to microscopic observations, the 30Â h milled sample showed an average particle size of about 95Â nm after the leaching process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 40, Issue 9, Part A, November 2014, Pages 14235-14246
Journal: Ceramics International - Volume 40, Issue 9, Part A, November 2014, Pages 14235-14246
نویسندگان
Bahman Nasiri-Tabrizi, Reza Ebrahimi-Kahrizsangi, Mojtaba Bahrami-Karkevandi,