نتایج جستجو برای: hfb2
تعداد نتایج: 67 فیلتر نتایج به سال:
سینتر با جرقه پلاسما (SPS) فرآیندی است که طی سال‌های اخیر برای سرامیک‌های فوق دما بالا به کار گرفته می شود. در این پژوهش کامپوزیتهای پایه ZrB2 با درصدهای مختلف HfB2 (Vol 15%-0) با استفاده از فرآیند SPS در دماها (1600- 1900)، زمانها (min 8-4) و فشارهای (MPa 40-10) سینتر شدند. به علاوه تأثیر MoSi2 بر نفوذ Hf در Zr مورد بررسی قرار گرفت. به منظور ارزیابی ریزساختار و نوع فازهای تشکیل شده بررسیهای...
The performance of carbon nanotube network (CNN) devices is usually limited by the high resistance of individual nanotube junctions (NJs). We present a novel method to reduce this resistance through a nanoscale chemical vapor deposition (CVD) process. By passing current through the devices in the presence of a gaseous CVD precursor, localized nanoscale Joule heating induced at the NJs stimulate...
Abstract The main goal of this study is optimization of densification of ZrB2-SiC composites reinforced with chopped Cf prepared by SPS. Taguchi method is employed as statistical design of experiment (DOE) to optimize densification parameters including SiC, Cf, MoSi2, HfB2 and ZrC content, milling time of Cf and SPS parameters such as temperature, time and pressure. Each of these factors ...
The present work considers the results on synthesis of composite clad powder systems with “core-shell” type structure for spraying wear-resistant metal-ceramic coatings. Powders highly hard TiB 2 and HfB borides were used as a core powder, titanium was to create coating their surface. cladding layer is synthesized by iodine transport method. Powder uses method detecting one component another ga...
Control rods are used in nuclear reactors to control fission the core. Different reactor designs must use different rod materials because of neutrons that can be found at various energies. These materials, which made chemical compounds such as B4C, ZrB2, TiB2 or HfB2 absorb neutrons, have absorption properties for In this study, Akkuyu Nuclear Reactors were investigated. It has been taken into ...
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