نتایج جستجو برای: boron carbide synthesis
تعداد نتایج: 434147 فیلتر نتایج به سال:
In this work, the successful heteroepitaxial growth of boron carbide (B x C) on 4HSiC(0001) 4° off substrate using chemical vapor deposition (CVD) is reported. Towards end, a two-step procedure was developed, involving 4H-SiC boridation under BCl 3 precursor at 1200°C, followed by conventional CVD + C H 8 1600°C. Such allowed obtaining reproducibly monocrystalline (0001) oriented films B with s...
The self-propagating foaming process of porous Al-Ni intermetallics was investigated. Aluminum and nickel powders were blended, and titanium and boron carbide powders were added as reactive exothermic agents. The blended powder was extruded to make a rod-shape precursor. Only one end of the rod precursor was heated to ignite the reaction. The reaction propagated spontaneously throughout the pre...
The ablation material used during the National Ignition Campaign, a glowdischarge polymer (GDP), does not couple as efficiently as simulations indicated to the multipleshock inducing radiation drive environment created by laser power profile [1]. We investigate the performance of two other ablators, boron carbide (B4C) and high-density carbon (HDC) and compare with GDP under the same hohlraum c...
High pressure high temperature (HPHT) synthesis of crystallographically well-defined boron doped diamond (BDD) microparticles, suitable for electrochemical applications and using the lowest P T (5.5 GPa 1200 °C) growth conditions to date, is reported. This aided through use a metal (Fe–Ni) carbide forming catalyst an aluminum diboride (AlB2) source. The latter also acts as nitrogen sequester, r...
Boron and nitrogen doped graphenes are highly promising materials for electrochemical applications, such as energy storage, generation and sensing. The doped graphenes can be prepared by a broad variety of chemical approaches. The substitution of a carbon atom should induce n-type behavior in the case of nitrogen and p-type behavior in the case of boron-doped graphene; however, the real situati...
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