کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5000664 1460754 2017 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Submicron binderless polycrystalline diamond sintering under ultra-high pressure
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی برق و الکترونیک
پیش نمایش صفحه اول مقاله
Submicron binderless polycrystalline diamond sintering under ultra-high pressure
چکیده انگلیسی


- Pure diamond compacts with submicron grain size were prepared by sintering diamond powder at 14.0 GPa and 1600-2000 °C.
- The sintered PCD performed the excellent mechanical properties (Hv ≈ 125.0 GPa) which is comparable to NPD.
- The graphite completely transformed into diamond at 14.0 GPa and 2000 °C.
- The resulting PCD exhibited numerous {111} nano-twins and a large amount of stacking faults inside grains.

Pure diamond compacts with submicron grain size were prepared by sintering diamond powder at 14.0 GPa and 1600-2000 °C using a multi-anvil apparatus. The synthesis conditions were much milder than those required when using graphite as the precursor. The sintered polycrystalline diamond (PCD) displayed excellent mechanical properties comparable to those of nano-polycrystalline diamond. The highest Vickers hardness measured for PCD was 125.0 GPa. During sintering, the small diamond grains between larger grains transformed into graphite first at moderate sintering temperature, and then the graphite transformed into diamond at 14.0 GPa and higher temperature. The large amounts of nano-twins and stacking faults inside the diamond grains contributed to the high Vickers hardness of PCD.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Diamond and Related Materials - Volume 77, August 2017, Pages 41-45
نویسندگان
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