Jan 01,1999·It is considered that carbon coating on such regular carbon coils may result in the formation of a micro-pipe or micro-solenoid which could be expected to provide novel functional properties.In this study,the regular carbon coils with no coil gap were coated with the pyrolytic carbon films by the decomposition of methane in an argon atmosphere,and the coating conditions and their results for this questionHow is pyrolytic carbon prepared in a reactor?How is pyrolytic carbon prepared in a reactor?Pyrolytic carbons are prepared by heating a hydrocarbon such as propane to approximately 12001400 ° C in the absence of oxygen.At high temperature,the hydrocarbon breaks down to carbon free radicals,which then covalently bond to form the solid PyC material.In order to produce isotropic PyC,a fluidised bed reactor is needed.Pyrolytic Carbon - an overview ScienceDirect Topics results for this questionHow is pyrolytic carbon used for joint replacement?How is pyrolytic carbon used for joint replacement?Pyrolytic carbon (PyC) used for joint replacements is a specific form of elemental carbon that has been tailored for strength,durability and compatibility within the often hostile biological environment.The PyC structure is an imperfectly crystalline,turbostratic graphene or graphite-like pure elemental carbon structure.Pyrolytic Carbon - an overview ScienceDirect Topics
FIG.4 .4Scanning electron microscopy (SEM) micrographs of virgin carbon fibers (a),carbon fibers recovered from prepregs pyrolysis at 500,550,and 600 C (b-d),and from cured pyrolyzed carbon fiber reinforced composites (CFRCs) (e-h) at 450,500,550,and 600 C.Scale bar 20 mm.FIG.7 .7Raman spectra of cured scraps pyrolyzed at 500 C (A Ablation Experiments of Ultra-High-Temperature Ceramic Apr 30,2020·Ablation experiments of four thermal protection system (TPS) candidate specimens,including two UHTCs-coated (HfC and HfCTiC) specimens,were performed.The specimens were tested at the VKIs 1.2 MW ICP plasma wind tunnel.Intrusive flow diagnostic techniques (calorimetric probe and Pitot tube) were used to experimentally determine cold wall heat flux and dynamic
Feb 01,2016·The carbon and carbonalumina lattices and honeycombs of this work are compared to other microarchitected and macroscopically structured lattice materials 15,16,19,37,to carbonCarbon micro-coils were coated with pyrolytic carbon films by the decomposition ofmethanein an argon atmosphere,and the coating conditions and some of their properties were examined.Author:Xiuqin Chen,Seiji Motojima,Hiroshi IwanagaCited by:77Publish Year:1999Carbon coatings on carbon micro-coils by pyrolysis of Was this helpful?People also askWhich is not covered by the term pyrolytic carbon?Which is not covered by the term pyrolytic carbon?Also carbon materials,obtained by physical vapor deposition (PVD) are not covered by the term pyrolytic carbon.Pyrolytic carbon is produced by the thermal decomposition of a hydrocarbon gas,e.g.,methane,propane,acetylene,etc.The decomposition temperature may be roughly in the range of 14002500 °C.Pyrolytic Carbon - an overview ScienceDirect TopicsCited by 56Publish Year 2010Author Xiaosi Qi,Chuan Qin,Wei Zhong,Chaktong Au,Xiaojuan Ye,Youwei DuProcessing of fiberreinforced ultrahigh temperature Dec 12,2019·Vinci et al found that SiC contents over 15 vol% in a ZrB 2 SiC matrix ensured the formation of a homogeneous protective borosilicate layer over the sample that minimized C f degradation and burnout during 1-minute oxidation tests at 1500-1600°C.32 Pyrolytic carbon (PyC) coatings have also been shown to protect C f from processing-related damage.33 Lastly,the coefficient of thermal expansion (CTE) mismatches between UHTC matrix phases and C f
Pyrolytic carbon is produced by the thermal decomposition of a hydrocarbon gas,e.g.,methane,propane,acetylene,etc.The decomposition temperature may be roughly in the range of 14002500 °C.The structure and density of the product depend upon the substrate temperature and the nature of the hydrocarbon gas and its flow rate.Cited by 77Publish Year 1999Author Xiuqin Chen,Seiji Motojima,Hiroshi IwanagaCarbon Vol 37,Issue 11,Pages 1677-1878 (1999 Carbon coatings on carbon micro-coils by pyrolysis of methane and their properties.Xiuqin Chen,Seiji Motojima,Hiroshi Iwanaga.Pages 1825-1831 Download PDF.Article preview.select article Effect of binder addition on the mechanical and physicochemical properties of low rank coal char briquettes.Coiled carbon nanotubes their structural and electrical Jul 24,2003·Coiled carbon nanotubes exhibit excellent mechanical and electrical properties because of the combination of coil morphology and properties of nanotubes.They could have potential novel applications in nano-composite,nano-electronic devices as well as nano-electromechanical system (NEMS).In this work,synthesis of regularly coiled carbon nanotubes is presented.It involves pyrolysis
DeepDyve is the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.Formation and Growth Mechanism of Dissimilar CoiledApr 24,2004·Dissimilar coiled carbon nanotubes were prepared by catalytic chemical vapor deposition (CCVD) on finely divided Co nanoparticles supported on silica gel under reduced pressure and at lower gas flow rates.The morphology of the regular coiled carbon nanotubes were examined by TEM,while the polygonization characteristics of the helix were examined by SAED.Observations were made onGeometry-Controlled Carbon Coils by SF6 Flow Injection AbstractIntroductionExperimental DetailsResults and DiscussionConclusionAcknowledgmentsCarbon nanocoils and/or microcoils were synthesized using C2H2 as the source gas along with the injection of SF6 as an incorporated additive gas under the thermal chemical vapor deposition (TCVD) system.To control the geometries of the carbon coils,we varied the SF6 flow injection time at different reaction temperature ranges.At the lowest reaction temperature (550°C),carbon microcoils were dominantly formed within a relatively short initial SF6 flow injection time (less than 5min).By increasinSee more on hindawi(PDF) Low-phosporous nickel-coated carbon microcoils Introduction Carbon microcoils (CMCs) have recently been the focus of a large amount of research,centered particularly on their synthesis,Fullerenes ,tubes ,bers ,rods ,cones ,tips ,morphology,microstructure and growth mechanisms .and coils [7,8] are but a few examples of the stable and exotic forms
In 1972,Baker et al.[ 13] produced twisted carbon filaments with 3060 nm diameters using nickel particle catalyst.The following year,Boehm reported twisted carbon filaments and double helical filaments by pyrolysis of diluted Fe (CO) 5 vapor.This led to a proposed growth mechanism for double helical filaments [ 14 ].Helical multiwalled carbon nanotubes (h-MWCNTs Jun 01,2010·Chen X Q,Motojima S,Iwanaga H.Carbon coatings on carbon micro-coils by pyrolysis of methane and their properties[J].Carbon,1999,37(12) 1825-1831. Luo T,Liu J W,Chen L Y,et al.Synthesis of helically coiled carbon nanotubesLarge-Scale Synthesis and Characterization of Helically Helically shaped multiwalled carbon nanotubes (HCNTs) (diameter 3080 nm) were obtained as main products in large quantities by co-pyrolysis of Fe(CO)5 as floating catalyst precursor and pyridine or toluene as carbon source at temperatures above 1000 °C under flow of hydrogen.In contrast,pyrolysis at 700800 °C yielded only carbon-coated Fe nanoparticles.The HCNTs were characterized
product of acetylene pyrolysis over Fe nanoparticles at 450 °C was helical carbon nanofibers (HCNFs) (1.582 g,mass of product collected after reaction) .As shown in Figure 6,the HCNFs have two coiled nanofibers grown on a catalyst nanoparticle.The two coils are identical in cycle number and areMaterials Free Full-Text Protective Carbon Overlayers Hydrothermally stable carbon overlayers can protect mesoporous oxides (SiO2 and Al2O3) from hydrolysis during aqueous-phase catalysis.Overlayers made at 800 °C by pyrolysis of 2,3-naphthalenediol deposited out of acetone solution were analyzed by solid-state 13C nuclear magnetic resonance (NMR) spectroscopy.Power absorption due to sample conductivity was prevented byMicrowave absorption properties of carbon fibers with Mar 15,2014·Double-carbon microcoils and single-carbon nanocoils were selectively grown on the surface of carbon fibers (CFs) via decomposition of acetylene at the temperature of 680 °C using Ni and Ni/Al2O3 catalysts,respectively.The morphology and microstructure of the as-prepared carbon coilsCFs were studied by SEM and Raman spectra,and the microwave absorption properties were
resonators.Pyrolytic carbon is conductive and can be obtained directly from photoresist through pyrolysis at elevated temperatures in inert atmosphere.The advantage of this fabrication method is that the geometry of carbon micro- and nanostructures such as micropillar arrays ,bridges Preparation of carbon microcoils by catalytic Aug 01,2005·Abstract.Carbon microcoils (CMCs) were prepared by catalytic pyrolysis of acetylene containing a small amount of thiophene as a promoter at 9731073 K using nickel foam catalyst which was also used as a substrate,with the CMC yield of about 62% relative to the introduced carbon source.The morphology of the product was observed by scanning electron microscopy (SEM).Siloxane Precursor-Based Protective Coatings for High In this study,the application of coating layers on high modulus carbon fibers was achieved by continuous liquid phase coating (CLPC).This coating technology,developed by Kern and Gadow [13,14,15],is a cost-efficient alternative to CVD and PVD techniques based on a continuous dip-coating process.It enables the deposition of dense and homogenous thin ceramic coatings on every single filament of a
Oct 13,2016·Chen X Q,Motojima S and Iwanaga H 1999 Carbon coatings on carbon micro-coils by pyrolysis of methane and their properties Carbon 37 182531.Crossref Google ScholarSynthesis of carbon coiled micro/nano-structures in the Dec 12,2006·However,in the case of sample containing both carbon micro coils and coiled carbon nanobers,wide range of diameter distribution was present (e.g.,ranging from Fig.3 (a) Magnied view of bunch of double helical carbon 300 nm up to ~5 lm) and hence resulting a good microcoils present in the sample under SEM while (b) vertical reection
Dec 12,2006·The possible reason for this observation is that in the case of samples containing either carbon micro coils or coiled carbon nanofibersvery narrow rage of diameter distribution was present (e.g.,in the case of carbon micro coils diameter 3 to 4 m and in the case of coiled carbon nanofibers diameter 300 to 400 nm).Synthesis of carbon nanocoils by microwave CVD - IOPscienceSep 20,2002·The carbon nanocoil is an interesting kind of nanomaterial,which is expected to have various novel applications in microelectronics,microelectromechanical systems (MEMS) and bioMEMS due to its nanosize coil morphology.Carbon nanocoils were synthesized by catalytic pyrolysis of acetylene over 2.23.0 µm Ni particles at 600°C in a microwave chemical vapour deposition (CVD)The synthesis,properties and uses of carbon materials Bi et al. found that coated carbon micro-coils showed distinct variability when compared to uncoated carbon micro-coils.Their results indicated that by coating carbon micro-coils with Ni and P,they could control the magnetic and dielectric losses,thereby substantially increasing the electromagnetic energy dissipation.
A hard carbon (HC) material was prepared from isotropic coal tar pitch (CTP) by a simple oxidation- carbonization two-step method.Structural analysis showed that the CTP-HC material was a kind of microporous carbon,which was poorly crystallized and contains some graphite-like micro-crystallites.The CTP-HC was investigated as the anode material for lithium ion battery and theUS5320659A - Method of forming a carbon coated optical A surface of an optical fiber is coated by a method for coating a surface of an optical fiber with carbon comprising steps of introducing an optical fiber in a reaction chamber in the same direction as the flow of a coating raw material comprising carbon,hydrogen and halogen atoms and depositing on the surface of the optical fiber a carbon layer formed from the raw material by chemical vapor deposition,WO2013181606A1 - Catalytic surfaces and coatings for the This disclosure describes a coating composition comprising Mn x O y ,MnCr 2 O 4 ,or combinations thereof in a first region of a coating having a first thickness,wherein x and y are integers between 1 and 7; and X 6 W 6 (Si Z ,C 1-Z ) in a second region of the coating having a second thickness,wherein X is Ni or a mixture of Ni and one or more transition metals and z ranges from 0 to 1.