نتایج جستجو برای: b4c

تعداد نتایج: 739  

Journal: :Journal of the Japan Society of Powder and Powder Metallurgy 1990

Journal: :Polymer Composites 2023

In this study, 1 wt% boron carbide (B4C) reinforced PVA nanofibers were fabricated by the electrospinning technique as a new generation of ultra-thin, lightweight, and flexible neutron shielding nanocomposites. The influence B4C particles' size morphology on fiber formation radiation performance mats was investigated. results indicate that particle characteristics have dramatic properties thick...

Journal: :Journal of Applied Physics 2023

Ultrashort period 1.0 nm W/Si multilayers have potential as dispersive Bragg reflectors in high-resolution x-ray fluorescence. However, formation of WSix leads to poor optical performance. To address this, we introduce ultrathin 0.1 B4C diffusion barriers sputter-deposited W/Si, inhibiting W–Si interaction. We demonstrate that the peak reflectance at a wavelength 0.834 increased with factor 3.4...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت دبیر شهید رجایی - دانشکده مکانیک 1391

امروزه استفاده از مواد با شرایط کاربرد در دماهای بالا مورد توجه بسیاری از صنایع از جمله نیروگاه ها، صنایع فضایی، هوافضا و صنایع نظامی می باشد. کامپوزیت کربن – کربن به عنوان یک ماده مهندسی در درجه حرارت بالا، در صورتی کاربرد موفق دارد که از پوشش محافظ در برابر اکسیداسیون برخوردار باشد. از میان کلیه پوشش های تحقیق شده، نوع پوششی که حاوی zrb2 و sic باشد از همه موفق تر بوده و هنوز تحقیق در مورد بهب...

Journal: :Journal of Thermal Spray Technology 2022

Boron carbide (B4C) is considered an ideal material for plasma-facing materials (PFMs) in nuclear fusion, due to a combination of excellent properties: high elastic modulus, chemical stability, low Z and melting point. In this paper, B4C coatings were fabricated onto tungsten (W) substrates using atmospheric plasma spraying (APS). The powder feed rate significantly affects the coating quality. ...

Journal: :Science of Sintering 2022

In this study, aluminium matrix boron carbide (B4C) and carbon nanofiber (CNF) reinforced hybrid composite was produced by powder metallurgy method their microstructure mechanical properties were investigated. The samples at 6 percentage volume ratios using hot pressing technique. Microstructure examination, hardness measurement, transverse rupture test, wear tests carried out in order to deter...

Journal: : 2022

A project of an X-ray monochromator for the «SKIF» synchrotron based on two flat mirrors with multilayer reflective coatings is reported. The concept absence precision mechanical systems and feedthroughs in vacuum, which significantly reduces mirror surface contamination increases scanning accuracy. In addition, overall structure device greatly simplified this way, turn leads to a significant r...

Journal: :Coatings 2022

Aluminum-based metal matrix composites with single or multiple ceramic reinforcements are finding application in the aerospace and automobile industries. In this research work, novel AA7150-B4C (aluminium7150 alloy–Boron carbide) nanocomposites were successfully fabricated, through liquid metallurgy route via stir casting method, incorporation of B4C nanoparticles different weight percentages u...

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