
Highly anisotropic Fe3C microflakes constructed by solid-state …
2024年2月19日 · Here, we propose a pathway via solid-state phase transformation to obtain the large-scale preparation of Fe 3 C microflakes with crystal orientation. The morphology can be adjusted by solid-state...
The evolution of Fe5C2 with the carburization of N- and K …
2025年2月1日 · One-step facile pyrolysis synthesizing Fe/Fe 3 C-based core–shell catalysts with high Fe loadings and no other impurities. In situ N and K addition increases oxygen vacancies and defects in the carbon shell, benefiting substrate transport. N and K coordinate to promote Fe 5 C 2 /Fe 3 C formation and mitigate carbide oxidation.
Surface modification by CO2 plasma boosting core shells …
2024年3月1日 · Hou and coworkers successfully synthesized Fe/Fe 3 C–C core-shell microspheres through chemical vapor deposition method, and the RL min value achieved −58.5 dB at around 15.2 GHz under a thickness of 2 mm, due to the synergistic mechanism between the dielectric carbon shells and magnetic Fe/Fe 3 C cores [18].
A transition of ω-Fe3C → ω′-Fe3C → θ′-Fe3C in Fe-C ... - Nature
2020年4月8日 · Carbon steel is strong primarily because of carbides with the most well-known one being θ-Fe 3 C type cementite. However, the formation mechanism of cementite remains unclear. In this study, a...
Fe/Fe3C modification to effectively achieve high-performance …
2022年9月30日 · Herein, composites of Fe/Fe 3 C-modified carbon nanofiber–coated Si nanoparticles (Fe/Fe 3 C–Si@CNFs) were synthesized via a simple electrospinning method. These composites effectively overcome the volume change effect, poor interfacial compatibility and low conductivity, delivering excellent LIB performance.
高鹏、孙予罕团队ACB: 过渡金属掺杂铁基催化剂上CO2加氢制烯烃 …
H2-TPR(图1a)、CO-TPR(图1b)、CO2-TPD(图1c)、 H2-TPD (图1d)表征结果显示:Zn和Cu助剂能促进铁物种的还原和渗碳,有利于Fe3O4和Fe5C2活性相的形成,同时显著提高了催化剂的表面碱性和H2的活性。虽然Mn的引入增强了铁氧化物的还原性,但Mn与铁物种之间的 …
渗碳体 - 百度百科
渗碳体(cementite)是铁与碳形成的金属化合物,其化学式为Fe3C。 渗碳体的含碳量为ωc=6.67%,熔点为1227℃。 其晶格为复杂的正交晶格,硬度很高HBW=800,塑性、韧性几乎为零,脆性很大。
Fe3C化合物电子结构磁性和硬度的第一性原理研究.pdf
2015年8月18日 · 因此,本文应用第一性原 理计算的方法研究了两种结构Fe3C 化合物的能量、电子结构及磁性和硬度等性能,对这两 种结构的稳定性和性能等进行了比较。 1. 计算方法 第一性原理计算采用剑桥大学研发的CASTEP (Cambridge Serial Total Energy Package) [4] [5] [6] 软件包 ,交换关联势选用广义梯度近似 (GGA) ,离子势选用超软 (ultra soft)势 。 为了获 得计算精度与收敛速度的平衡,平面波截断能量Eout =300eV ,能量收敛精度为1 × 10-5eV, 作用在每个原 …
Phase Relations of Iron Carbides Fe2C, Fe3C, and Fe7C3
Based on first-principle calculations in the framework of the density functional theory and structure prediction algorithms, we have determined iron carbide phases stable at the Earth's core...
功能Fe3C的制备及其性能研究进展 - 豆丁网
2016年5月25日 · Fe3C的磁学性能进行测试,也发现温度会对Fe。C的FMR. 多个研究小组与本实验小组正在尝试控制材料的微观结构, 曲线造成影响,而且C含量的增加还会显著降低铁磁性能, 探索制备高纯纳米级的FeaC和填充在CNTs中或被碳纳米