相关实验视频

Updated: May 1, 2026

Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles

Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles

Published on: November 27, 2015

将纳米晶体转化为超硬的化碳酸纳米结构

Fernando Igoa Saldaña^1,2, Thomas Gaudisson³, Sylvie Le Floch³

¹Sorbonne Université, CNRS, Laboratoire de Chimie de la Matière Condensée de Paris (CMCP), 4 place Jussieu, F-75005 Paris, France.

|October 25, 2024

概括

研究人员开发了一种新型的纳米结构碳化物 (B_4+δC) 具有优越的硬度和无形化电阻. 这种超硬材料克服了工业应用的局限性.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
固态化学固态化学

背景情况:

碳化 (B_4+δC) 是一个有前途的结构材料,由于其低密度,高点和优良的机械性能.
碳化的工业应用受到其易于在应力下变形的阻碍.

研究的目的:

为了设计纳米结构的碳化物,增强硬度和抵抗无形化.
开发一种可扩展的合成路径,用于先进的碳化材料.

主要方法:

在化盐中Na_1-B_5-C₁₊ (x = 0.18) 纳米晶体的同态转化.
使用固态B和CNMR和密度函数理论 (DFT) 的表征.
在高压下进行火花等离子体烧结 (SPS) 进行密集.

主要成果:

成功合成了10纳米B_4.1C纳米晶体,显著减少了尺寸.
核磁共振和DFT揭示了纳米晶体内的复杂原子配置,包括B₁₁C二元体单位和共价链.
火花等离子烧结实现了充分的密集,同时保持了纳米晶体大小.

结论:

由此产生的纳米结构碳化物表现出显著增强的硬度和抗无形化的性能.
纳米颗粒和高颗粒边界密度的组合是提高性能的原因.
这项工作为要求苛刻的应用提供了超硬碳化物材料的途径.

关键词:

碳化物碳化物硬度硬度硬度硬度高压的高压的高压.化的盐是化的盐.纳米晶体是一种纳米晶体.在火花等离子烧结过程中,火花等离子烧结.

更多相关视频

Negative Additive Manufacturing of Complex Shaped Boron Carbides

Negative Additive Manufacturing of Complex Shaped Boron Carbides

Published on: September 18, 2018

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

相关概念视频

Network Covalent Solids

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...