相关实验视频

Updated: Dec 29, 2025

Atomic Force Microscopy Cantilever-Based Nanoindentation: Mechanical Property Measurements at the Nanoscale in Air and Fluid

Atomic Force Microscopy Cantilever-Based Nanoindentation: Mechanical Property Measurements at the Nanoscale in Air and Fluid

Published on: December 2, 2022

纳米结钻石具有前所未有的硬度和稳定性

Quan Huang¹, Dongli Yu¹, Bo Xu¹

¹1] State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China [2].

|June 13, 2014

概括

研究人员合成了具有特殊硬度和热稳定的纳米双胞胎钻石 (nt-diamond). 这一突破克服了传统钻石的局限性,为要求高的应用中先进的碳材料铺平了道路.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
晶体学晶体学是指结晶学.

背景情况:

钻石的硬度受到不良的热稳定性所限制,限制了高温应用.
纳米结构通过Hall-Petch效应增强了钻石的硬度,但纳米颗粒钻石的热稳定性降低了.
以前试图从碳前体中制造纳米双胞胎钻石 (nt-diamond) 的尝试一直没有成功.

研究的目的:

开发一种合成纳米结合钻石 (nt-diamond) 的方法,以提高硬度和热稳定性.
研究nt-diamond在先进材料应用中的潜力.
在合成钻石中探索新的晶体结构.

主要方法:

在高压和高温下使用洋碳纳米粒子直接合成nt-diamond.
合成材料的微观结构的表征,包括双厚.
机械性能 (维克尔硬度) 和热稳定性 (氧化温度) 的评估.

主要成果:

成功直接合成nt-钻石,平均双胞胎厚度约为5nm.
观察一种新的单临床晶体形式的钻石与nt-diamond共存.
取得了前所未有的维克尔硬度,高达200GPa,在空气中氧化温度超过200°C,高于天然钻石.

结论:

纳米结构,特别是纳米制造,是创建具有优越硬度和热稳定的先进碳材料的可行策略.
开发的方法为制造大量具有特殊性质的nt-钻石提供了一条途径.
这项研究为在极端环境中使用基于钻石的材料开辟了新的可能性.

更多相关视频

$Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction$ 09:13

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction

Published on: April 1, 2017

$Synthesis and Microdiffraction at Extreme Pressures and Temperatures$ 07:26

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

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...

Toughness and Hardness of Aggregate

Toughness and Hardness of Aggregate

Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...