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Preparation and Tribological Properties of Onion-like Carbon/Waterborne Polyurethane Coatings
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作者 Fei Xingpeng Jiang Wuhao +3 位作者 Wen Maosheng Xu Yong Hu Kunhong Hu Enzhu 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2024年第2期108-120,共13页
Rice husk powder was used as a carbon source in a high-temperature carbonization reaction for the production of rice husk ash(RHA).Under the catalysis of ferric nitrate,onion-like carbon(OLC)nanomaterial with a partic... Rice husk powder was used as a carbon source in a high-temperature carbonization reaction for the production of rice husk ash(RHA).Under the catalysis of ferric nitrate,onion-like carbon(OLC)nanomaterial with a particle size of approximately 200 nm was successfully prepared and incorporated into waterborne polyurethane(WPU).The tribological properties of the coatings were determined using a controlled-atmosphere tribometer(WMT-2E)under dry-friction conditions.Following the friction test,the friction mechanism was investigated by characterizing the abrasive spot surfaces of the test samples using 3D laser microscopy and scanning electron microscopy/energy dispersive spectrometer.The final results demonstrated that the thermal stability of WPU composite coatings containing various concentrations of OLC nanoparticles was significantly enhanced,binding forces between coatings and steel sheets increased,and hardness improved compared to pure WPU coatings.Tribological tests revealed a notable enhancement in the anti-wear properties of WPU coatings due to the presence of OLC particles.Specifically,the wear rate of the 1.5%OLC/WPU coating was reduced by 45.3%.The coating’s anti-wear mechanism was attributed to the improvement in the mechanical properties of WPU due to OLC,as well as OLC’s participation in the formation of a transfer film under induced friction,which protected the matrix. 展开更多
关键词 biomass carbon onion-like carbon waterborne polyurethane WEAR transfer films
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Fabrication of Onion-like Carbon Using Nanodiamond by Annealing at Lower Temperature and Vacuum
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作者 邹芹 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第6期935-939,共5页
Onion-like carbon (OLC) was fabricated by annealing nanodiamond at 1000 ℃ for 2 hours in low vacuum (1 Pa). The OLC was characterized by X-ray diffraction (XRD), high resolution transmission electron microscopy... Onion-like carbon (OLC) was fabricated by annealing nanodiamond at 1000 ℃ for 2 hours in low vacuum (1 Pa). The OLC was characterized by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and differential scanning calorimetry (DSC). The experimental results show that the OLC exhibits similarity to the original nanodiamond particles in shape. The size of the OLC is found to be approximately 5 nm. The transformation mechanism of the OLC from nanodiamond was discussed also. 展开更多
关键词 NANODIAMOND onion-like carbon ANNEALING
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Fabrication of onion-like carbon from nanodiamond by annealing 被引量:1
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作者 Qin Zou MingZhi Wang +2 位作者 YanGuo Li YuCheng Zhao LiangHua Zou 《Science China(Technological Sciences)》 SCIE EI CAS 2009年第12期3683-3689,共7页
Onion-like carbon(OLC)was synthesized by annealing nanodiamond in low vacuum of 1 Pa and at annealing temperatures from 500℃to 1400℃.The high-resolution transmission electron microscope (HRTEM)images,X-ray diffracti... Onion-like carbon(OLC)was synthesized by annealing nanodiamond in low vacuum of 1 Pa and at annealing temperatures from 500℃to 1400℃.The high-resolution transmission electron microscope (HRTEM)images,X-ray diffraction(XRD)and Raman spectrum of the OLC showed that there was no OLC when the annealing temperature was lower than 900℃.Moreover,the fragment amorphous carbon existed on the surfaces of the nanodiamond particles.At the annealing temperature of 900℃,the OLC particles began appearing and the size of the OLC particles was smaller than 5 nm.When the annealing temperature was increased from 900℃to 1400℃,the nanodiamond was transformed into OLC gradu- ally.At the annealing temperature of 1400℃,all the nanodiamond particles were transformed into OLC completely.The OLC exhibited similarity to the original nanodiamond particles in shape.A mechanism for the OLC synthesis by annealing was provided.The graphitization started at the surfaces of the nanodiamond particles.The formation process of the OLC includes formation of graphite fragments, connection and curvature of graphite sheets between diamond(111)planes and closure of the graphite layers. 展开更多
关键词 onion-like carbon(olc) NANODIAMOND ANNEALING FABRICATION
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Efficient coating fabrication of onion-like carbon nanoparticles via aerosol deposition 被引量:1
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作者 Yaoyao Fu Yi Liu Hua Li 《Particuology》 SCIE EI CAS CSCD 2020年第6期58-62,共5页
In this work,an onion-like carbon(OLC)nanoparticle coating with a micron-sized thickness was fabricated via aerosol deposition(AD).During the room temperature impact consolidation(RTIC),the OLC nanoparticles(5-10 nm)e... In this work,an onion-like carbon(OLC)nanoparticle coating with a micron-sized thickness was fabricated via aerosol deposition(AD).During the room temperature impact consolidation(RTIC),the OLC nanoparticles(5-10 nm)experienced remarkable deformation along both the perpendicular and parallel directions to the coating-substiate interface.Particle deformation,mechanical interlocking,and van der Waals forces between the OLC particles were revealed as the major regimes for coating formation.The aerosol deposition technique might open new avenues for fabricating carbonaceous nanostructures for various functional applications. 展开更多
关键词 onion-like carbon Aerosol deposition NANOPARTICLES Thick film Particle deformation
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Ultrahigh hardness of carbon steel surface realized by novel solid carburizing with rapid diffusion of carbon nanostructures
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作者 Qing Tao Jian Wang +4 位作者 Liming Fu Zheng Chen Chengjin Shen Dekun Zhang Zhi Sun 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2017年第10期1210-1218,共9页
In this study, a novel rapid solid carburizing process with a large diffusion depth using nano-diamonds(NDs) was conducted for low carbon steel. Changes of annealed NDs were obtained by Raman spectroscopy and transm... In this study, a novel rapid solid carburizing process with a large diffusion depth using nano-diamonds(NDs) was conducted for low carbon steel. Changes of annealed NDs were obtained by Raman spectroscopy and transmission electron microscopy(TEM), and the results suggested that the NDs experience a stripping process before a special solid-reaction with surface iron atoms from steel substrate. Onionlike carbon(OLC) derived from the annealed NDs provided broken graphitic ribbons as carbon sources that accelerated the rate of adsorption and diffusion. Examination of the surface layer at equilibrium using TEM and X-ray photoelectron spectroscopy(XPS) also revealed the special state of carbon, and an ultrafine mixed phase microstructure was obtained by rapid solid-phase transformation. As a result, a surface hardened layer with ultrahigh hardness and a smooth transition region were realized. We believe that these kinds of diamond or graphitic structures with high activity states have an important influence not only on adsorption and diffusion but also on this special solid-phase transformation. 展开更多
关键词 Solid carburizing onion-like carbon(olc) DIFFUSION Solid-phase transformation Ultrahigh hardness
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