کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1475701 991126 2013 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, consolidation and characterization of monolithic and SiC whiskers reinforced HfB2 ceramics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Synthesis, consolidation and characterization of monolithic and SiC whiskers reinforced HfB2 ceramics
چکیده انگلیسی

Spark Plasma Sintering is used for the fabrication of highly dense HfB2 monolithic and HfB2–26 vol.% SiCw composite. Reactive SPS from elemental reactants is preferred for the preparation of bulk HfB2 instead of classical sintering. The desired phase is rapidly formed through a solid–solid combustion synthesis mechanism, while full densification is achieved in 30 min at 1350 A when the applied pressure is switched from 20 to 50 MPa after the synthesis reaction. A 99.4% dense whiskers-reinforced HfB2 ceramic matrix composite is also obtained in 30 min by SPS (I = 1350 A, P = 20 MPa) using SHSed HfB2 powders and SiCw. Nevertheless, whiskers degradation into SiCp resulted under such conditions (temperature up to 1830 °C). On the other hand, the presence of whiskers is clearly evidenced in 96% dense products obtained when the applied current was decreased down to 1200 A (1700 °C) while P was increased to 60 MPa.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 33, Issue 3, March 2013, Pages 603–614
نویسندگان
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