کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1792520 | 1023648 | 2010 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of Al additive on the formation of cubic boron nitride in Li3N–hBN system under HPHT
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
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چکیده انگلیسی
We have investigated the effect of Al on cBN formation in Li3N–hBN system at 5.0 GPa and 1300–1650 °C. Regular cBN single crystals of 0.2–0.5 mm in size were obtained. It appears that the presence of Al in hBN powder facilitates the formation of cBN crystals with regular shape, although it does not have any catalytic action for hBN–cBN phase transformation. With increasing Al concentration, the color of cBN changed darker from amber to black and the threshold temperature for cBN formation became higher. X-ray diffraction and Raman spectroscopy indicate that AlN formed by reaction of Li3N and Al and some B liberated in system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 312, Issue 23, 15 November 2010, Pages 3544–3548
Journal: Journal of Crystal Growth - Volume 312, Issue 23, 15 November 2010, Pages 3544–3548
نویسندگان
W. Guo, X. Jia, J. Shang, H.W. Xu, H.A. Ma,