Mechanical polishing of ultrahard nanotwinned diamond via transition into hard sp2-sp3 amorphous carbon

Jin, Tianye; Ma, Mengdong; Li, Baozhong; Gao, Yufei; Zhao, Qingliang; Zhao, Zhisheng; Chen, Junyun; Tian, Yongjun

doi:10.1016/j.carbon.2020.01.041

Cited by 44 publications

(6 citation statements)

References 28 publications

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“…The performance of the a-C film is not only related to its microstructure but also closely related to the hybridization rate of sp 2 and sp 3 in the C network. , Therefore, if the percentages of sp, sp 2 , and sp 3 in the a-C film are changed at different STs, it will affect the sliding friction behavior of the a-C film. The hybridization rate can be estimated by the following formula: where sp, sp 2 , and sp 3 represent the number of different bonding types in each slice.…”

Section: Resultsmentioning

confidence: 99%

High-Temperature Sliding Friction Behavior of Amorphous Carbon Films: Molecular Dynamics Simulation

et al. 2020

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With the development of the aerospace industry, the requirement for mechanical parts, which are serviced under extreme conditions such as high temperature, is more and more severe. Amorphous carbon (a-C) films are widely used in the aviation field as a protective coating because of their excellent antiwear and friction-reduction properties. However, a-C films are vulnerable to failure in a hightemperature environment, and a series of complex changes in the friction process make it a challenge to put forward the friction mechanism. Here, the sliding friction behaviors of amorphous carbon (a-C) films at different simulated temperatures (STs) (300−1300 K) were analyzed by molecular dynamics. The density, average coordination number, and local residual stress as well as the hybridization of sp, sp 2 , and sp 3 of a-C films were analyzed to reveal the high-temperature sliding friction mechanism of a-C films. The results show that the friction coefficient (μ) of a-C films increased with increase in ST. Meanwhile, the friction mechanisms of a-C films are different at an ST lower than 800 K and higher than 1100 K. Compared with those before sliding, the local residual stress of all a-C films is relaxed, which causes transformation of sp 3 into sp 2 . Moreover, when ST is lower than 800 K, the μ increased with increase in sp 3 %. When ST is higher than 1100 K, the stability of a-C films is broken, which results in the rapid increase in μ.

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Section: Resultsmentioning

confidence: 99%

High-Temperature Sliding Friction Behavior of Amorphous Carbon Films: Molecular Dynamics Simulation

et al. 2020

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“…It thus becomes a stumbling block in its potential use as the tool, especially in ultra‐precision cutting of hard‐to‐machine materials. [ 184 ] Prior to its industrial production, how to fabricate nt‐diamond is still waiting to be resolved. Thanks to workable traditional mechanical polishing [ 184a ] and femtosecond pulsed laser milling techniques, [ 184b ] such a challenge has been partially solved.…”

Section: D Diamond Nanostructuresmentioning

confidence: 99%

“…[ 184 ] Prior to its industrial production, how to fabricate nt‐diamond is still waiting to be resolved. Thanks to workable traditional mechanical polishing [ 184a ] and femtosecond pulsed laser milling techniques, [ 184b ] such a challenge has been partially solved. For example, under a synergistic effect bwtween mechanical loading and the catalysis of Fe nanoparticles, nt‐diamond was transferred to a hard sp 2 ‐sp 3 mixed amorphous carbon.…”

Section: D Diamond Nanostructuresmentioning

confidence: 99%

“…However, the surface of the amorphous carbon layer and the interface between amorphous carbon and nt‐D were both smooth after the application of a polishing process, of which final surface roughness (Ra) was 0.29 nm. [ 184a ] Compared to the conventional mechanical methods, the femtosecond pulsed laser milling technique was with higher efficiency, revealing the possibility to shape nt‐diamond related cutting tools. The cubic diamond within nt‐diamond was directly transformed into amorphization.…”

Section: D Diamond Nanostructuresmentioning

confidence: 99%

See 1 more Smart Citation

Diamond Nanostructures at Different Dimensions: Synthesis and Applications

Li,

Yang,

Jiang

et al. 2024

Adv Funct Materials

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Diamond materials at different nanoscales provide them various characteristics such as elastic mechanical properties in needle‐like nanotips, flexibility of 2D films having atomic thicknesses and constant hardness under high pressures, superior field electron emission properties of vertically wall‐like composites, unprecedented hardness and improved toughness of nanotwin diamond (nt‐diamond), while the inherent excellent properties of bulk diamond (e.g., high Young's modulus, robustness, biocompatibility) can be maintained. In this paper, the newly born 1D diamond nanothreads, 2D diamanes, as well as 3D nt‐diamond are briefly reviewed. The innovations, progresses and achievements of different dimensional diamond nanostructures, covering lines, planes and volumes are overviewed. The topical problems and future outlooks of diamond nanostructures are outlined and discussed.

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“…Consequently, the development of efficient technologies to resolve these issues in polishing CVD diamond films has received considerable attention. Nonetheless, the high hardness, wear resistance, and chemical inertness of diamond have always been technical challenges in modern manufacturing [26,27]. Most industrial applications of diamond require high-precision flattening to obtain ultra-smooth and damage-free surfaces.…”

Section: Introductionmentioning

confidence: 99%

Energy beam-based direct and assisted polishing techniques for diamond: A review

Li,

Jiang,

Jiang

et al. 2023

Int. J. Extrem. Manuf.

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Diamond is a highly valuable material with diverse industrial applications, particularly in the fields of semiconductor, optics, and high-power electronics. However, its high hardness and chemical stability make it difficult to realize high-efficiency and ultra-low damage machining of diamond. To address these challenges, several polishing methods have been developed for both single crystal diamond (SCD) and polycrystalline diamond (PCD), including mechanical, chemical, laser, and ion beam processing methods. In this review, the characteristics and application scope of various polishing technologies for SCD and PCD are highlighted. Specifically, various energy beam-based direct and assisted polishing technologies, such as laser polishing, ion beam polishing, plasma-assisted polishing, and laser-assisted polishing, are summarized. The current research progress, material removal mechanism, and influencing factors of each polishing technology are analyzed. Although some of these methods can achieve high material removal rates or reduce surface roughness, no single method can meet all the requirements. Finally, the future development prospects and application directions of different polishing technologies are presented.

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Mechanical polishing of ultrahard nanotwinned diamond via transition into hard sp2-sp3 amorphous carbon

Cited by 44 publications

References 28 publications

High-Temperature Sliding Friction Behavior of Amorphous Carbon Films: Molecular Dynamics Simulation

High-Temperature Sliding Friction Behavior of Amorphous Carbon Films: Molecular Dynamics Simulation

Diamond Nanostructures at Different Dimensions: Synthesis and Applications

Energy beam-based direct and assisted polishing techniques for diamond: A review

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