Results 151 to 160 of about 375,121 (181)
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HfC/ZrC ablation protective coating for carbon/carbon composites
Corrosion Science, 2013Abstract HfC/ZrC coatings were co-deposited on carbon/carbon composites by chemical vapor deposition using a gas mixture of HfCl 4 , ZrCl 4 , CH 4 , H 2 and Ar. The phase composition, microstructure, growth behavior and ablation performance of the HfC/ZrC coatings are investigated.
Xiang Xiong +5 more
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Lifetime improvement of Si field emitter arrays by HfC coating
IEEE/CPMT/SEMI. 28th International Electronics Manufacturing Technology Symposium (Cat. No.03CH37479), 2004In this paper, we report on our study of the emission life of HFC-coated Si FEAs (HFC FEAs).
M. Nagao +5 more
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Ceramics International, 2019
Abstract HfC nanowires (HfCNWs) were in-situ synthesized via CVD technique and acted as the reinforcement in the CVD-HfC coating for C/C composites. The morphology, flexural property and long-lasting anti-ablation performance of the HfC coating were researched.
Jincui Ren +3 more
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Abstract HfC nanowires (HfCNWs) were in-situ synthesized via CVD technique and acted as the reinforcement in the CVD-HfC coating for C/C composites. The morphology, flexural property and long-lasting anti-ablation performance of the HfC coating were researched.
Jincui Ren +3 more
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Influence of ambient gases on the HfC-coated Si field emitter arrays
IEEE/CPMT/SEMI. 28th International Electronics Manufacturing Technology Symposium (Cat. No.03CH37479), 2004In this paper, we have measured the emission characteristics of hafnium carbide (HfC) FEAs in argon (Ar) and oxygen (O/sub 2/) gas ambients and compared them to those of Si FEAs.
T. Sato +5 more
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SiC/HfC/SiC ablation resistant coating for carbon/carbon composites
Surface and Coatings Technology, 2012Abstract To improve the ablative resistance of carbon/carbon (C/C) composites, a SiC/HfC/SiC coating was prepared by a multi-step technique of diffusing reaction and chemical vapor deposition. The microstructure and morphology of the coatings were characterized by Scanning Electron Microscopy, X-ray diffraction.
Yongjie Wang +5 more
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Improved emission stability of HfC-coated carbon nanotubes field emitters
Solid State Communications, 2005Abstract Plasma-enhanced chemical vapor deposition (PECVD) method was employed to synthesize the Fe-catalyzed carbon nanotubes (CNTs). Hf films were deposited onto the synthesized CNTs, followed by heat treatment at 1200 °C which could form HfC. Field emission properties indicate that the HfC-coated CNTs have good emission current density due to low ...
Jun Jiang +9 more
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SiC Nanowires Toughed HfC Ablative Coating for C/C Composites
Journal of Materials Science & Technology, 2015In order to improve ablation resistance of carbon/carbon (C/C) composites, SiC nanowires were prepared on C/C composites surface in prior through chemical vapor reaction before HfC coating. SiC nanowires grew randomly and had good combination with HfC coating.
Hejun Li +3 more
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High current Si field emission devices with plasma passivation and HfC coating
Eleventh International Vacuum Microelectronics Conference. IVMC'98 (Cat. No.98TH8382), 2002Dry etching with mask erosion was used to etch emitter tips in single-crystal Si. Effects of surface passivation on the emission characteristics of gated Si field emitters were studied by exposing the samples to a H/sub 2/ plasma for 2 min before testing. Emitter tips were also coated with Mo silicide and HfC to improve their emission characteristics.
M.R. Rakhshandehroo, S.W. Pang
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Effects of Pressure and a Microporous Coating on HFC-245fa Pool Boiling Heat Transfer
Journal of Heat Transfer, 2013A study was conducted to experimentally characterize the pool boiling performance of hydrofluorocarbon HFC-245fa at pressures ranging from 0.15 MPa to 1.1 MPa (reduced pressure range: 0.04–0.31). Pool boiling experiments were conducted using horizontally oriented 1-cm2 heated surfaces to quantify the effects of pressure and a microporous-enhanced ...
Gilberto Moreno +2 more
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Solid State Sciences, 2013
Abstract Hafnium carbide (HfC) coatings were deposited on carbon/carbon (C/C) composites by low pressure chemical vapor deposition (LPCVD) using HfCl4–CH4–H2–Ar system. The effect of the ratio of CH4 to HfCl4 (input C/Hf ratio) on the deposition of HfC coatings was investigated.
Ya-lei Wang +6 more
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Abstract Hafnium carbide (HfC) coatings were deposited on carbon/carbon (C/C) composites by low pressure chemical vapor deposition (LPCVD) using HfCl4–CH4–H2–Ar system. The effect of the ratio of CH4 to HfCl4 (input C/Hf ratio) on the deposition of HfC coatings was investigated.
Ya-lei Wang +6 more
openaire +1 more source