共查询到19条相似文献,搜索用时 109 毫秒
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CVD金刚石应用前景探讨 总被引:2,自引:0,他引:2
阐述CVD金刚石发展及其在工业金刚石中的重要地位.聚晶质和单晶质CVD金刚石在切削工具、散热元件、耐磨零件、高强度复合线材以及检测器等方面已取得成功的应用,但有些问题仍待解决.对单晶质CVD金刚石的突出性能及其在高科技应用的可能性与发展远景作了评述. 相似文献
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阐述HPHT金刚石发展的局限性与CVD金刚石的进展历程。论述以CVD技术合成金刚石的方法及其发展趋势,包括提高CVD速度和改进CVD金刚石性质。 相似文献
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阐述金刚石切削工具在机加工中的重要作用和CVD金刚石的优异性能以及CVD金刚石切削工具的形式.对CVD金刚石薄膜切削工具和CVD金刚石厚膜切削工具的特点和应用范围进行了分析对比,并指出存在问题和发展前景. 相似文献
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提高CVD金刚石涂层刀具附着力的应用研究 总被引:2,自引:0,他引:2
文章介绍了影响CVD金刚石涂层刀具附着力的因素,并重点对提高其附着力的工艺措施进行了较深入的研究,对解决刀具基体与金刚石薄膜之间的附着力过小的问题有一定的指导意义。 相似文献
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文章从经济的角度,通过专业的财务分析,对CVD金刚石膜这一新型材料的投资价值进行研究。研究认为,CVD金刚石膜将成为金刚石材料未来发展的主流,其材料和制品具有广阔的市场前景。因此,投资CVD金刚石膜将获得丰厚的经济回报。 相似文献
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以CH4和H2为气源,用微波辅助等离子体装置,在10.0 mm×7.0 mm的砷化镓基底上沉积了CVD金刚石薄膜,用扫描电子显微镜观察沉积效果,拉曼光谱表征沉积质量,分析薄膜附着力与砷化镓材料性能的关系。结果表明,当基体温度为600℃,气压为5 kPa,甲烷浓度为2.0%时,在砷化镓片表面上沉积出了CVD金刚石薄膜,晶粒尺寸均匀,晶形完整、规则,晶界非常清晰。 相似文献
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A. Balducci M. Jaksic A. Lo Giudice C. Manfredotti Marco Marinelli S. Medunic G. Pucella G. Verona-Rinati 《Diamond and Related Materials》2005,14(11-12):1988
Frontal IBIC (Ion Beam Induced Current) mesurements have been carried out on new single crystal epitaxial CVD diamond. The sample consists of about 100 μm synthetic diamond grown by microwave CVD on a 300 μm thick, low cost, HPHT diamond substrate (see Balducci et al. – this conference). Both proton and alpha microbeams of energies 3 and 4.5 MeV have been used, with a beam diameter spot of about 1.5–3 μm. Scanned areas varied from 450 μm × 450 μm down to 150 μm × 150 μm and the homogeneity of charge collection efficiency (cce) was suitably monitored. At voltage bias of 80–100 V, the average cce was in the range 42–50%. Depending on the scanned surface area and on the beam type, energy resolutions FWHM from 1.3% to 4.1% FWHM have been obtained, even at counting rates as high as 700 cps. 相似文献
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M.L. Markham J.M. DodsonG.A. Scarsbrook D.J. TwitchenG. Balasubramanian F. JelezkoJ. Wrachtrup 《Diamond and Related Materials》2011,20(2):134-139
The ability to minimise, control and manipulate defects in CVD diamond has grown rapidly over the last ten years. The application which best illustrates this is probably that of quantum information processing (QIP) or ‘diamond spintronics’. QIP is a rapidly growing area of research, covering diverse activities from computing and code breaking to encrypted communication. All these applications need ‘quantum bits’ or qubits where the quantum information can be maintained and controlled. Controlled defects in an otherwise high perfection diamond lattice are rapidly becoming a leading contender for qubits, and offer many advantages over alternative solutions. The most promising defect is the NV− defect whose unique properties allow the state of its electron spin to be optically written to and read from. Substantial developments in the synthesis of CVD diamond have produced diamond lattices with a high degree of perfection, such that the electron spin of this centre exhibits very long room temperature decoherence times (T2) in excess of 1 ms. This paper gives a brief review of the advantages and challenges of using CVD diamond as a qubit host. Lastly the various qubit applications being considered for diamond are discussed, highlighting the current state of development including the recent development of high sensitivity magnetometers. 相似文献
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UV Schottky photodiode on boron-doped CVD diamond films 总被引:2,自引:0,他引:2
V.I. Polyakov A.I. Rukovishnikov L.A. Avdeeva Z.E. Kun'kova V.P. Varnin I.G. Teremetskaya V.G. Ralchenko 《Diamond and Related Materials》2006,15(11-12):1972
We report on experimental study of photosensitivity and Q-DLTS spectra of polycrystalline CVD diamond UV photodetectors. The measured characteristics of Schottky photodiode on boron-doped diamond films are compared with those obtained for planar photoconductive structures (photoresistor type) based on undoped CVD diamond. The Schottky photodiode exhibited a sharp cut-off in photoresponse with spectral discrimination ratio (between wavelengths of 190 nm and 700 nm) as high as 5 · 105 at zero bias voltage (at zero dark current). The photodiode showed the maximum of photoresponse at wavelength < 190 nm, and a low density of trapping and recombination centers as evaluated with the Q-DLTS technique. The devices demonstrated the photoresponsivity at 190 nm from 0.03 to 0.1 A/W with quantum yield of 0.20 to 0.67 in closed circuit, while the photovoltage ≥ 1.6 V was measured in open circuit regime. Another type of UV detector, the planar photoconductive structures with interdigitizing ohmic electrodes fabricated on undoped diamond film and operated under a bias voltage, revealed a higher density of (surface) defect centers and the maximum photoresponse at 210 nm wavelength. A strong influence of UV light illumination on the Q-DLTS spectra of the planar photoconductive structures was observed. This effect can be used for development of new UV detectors and dosimeters based on the Q-DLTS signal measurements. 相似文献
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V. V. Dvorkin N. N. Dzbanovsky N. V. Suetin E. A. Poltoratsky G. S. Rychkov E. A. Il''ichev S. A. Gavrilov 《Diamond and Related Materials》2003,12(12):2208-2218
Secondary electron emission from boron doped diamond polycrystalline membranes (hole concentration 5×1018 cm−3), prepared by microwave plasma assisted CVD, was investigated in both the reflection and transmission configurations. The model of secondary electrons behavior taking into account the distribution and diffusion mechanism of secondary electrons is proposed to explain the yield dependencies on primary electron energy in both configurations. The model predicts the SEE yield K=19 at the primary electron energy E0 close to 1 keV for reflection configuration and K=3–7 at E0=15–30 keV for transmission configuration for polycrystalline films used in the study. Experimental measurements of the SEE yield vs. primary electron energy (18 at E0=950 eV for the reflection scheme and 3.5–4 at E0=25 keV for the transmission one) are found to accord well with the theoretical results. Estimations, which were made using the model, show that SEE yield in transmission configuration can be increased up to 60 for the primary electron energy of about 10 keV. Since such high yields in transmission scheme may be obtained in monocrystalline membrane, another approach using porous polycrystalline diamond membranes is considered. Porous diamond membranes having SEE yield in transmission scheme of more than 10 at the primary electron energy E0=1 keV were fabricated. 相似文献
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N. Cella H. El Rhaleb J.P. Roger D. Fournier E. Anger A. Gicquel 《Diamond and Related Materials》1996,5(12):1424-1432
Micron thick diamond films have been studied by spectroscopic ellipsometry (SE). The films were grown, on previously prepared Si(100) substrates, by the plasma enhanced chemical vapor deposition (PECVD) technique. Ex situ SE measurements were carried out on samples grown under different conditions, such as substrate temperature and methane fraction in the gas mixture. An optical model consisting of five layers was constructed in order to explain the SE spectra and to provide the optical and structural parameters of the films. This model was deduced from results of various measurements performed by other characterization techniques (Raman spectroscopy, scanning electron microscopy, atomic force microscopy and positron annihilation spectroscopy) which have revealed the optical and structural parameters of the samples. Its sensitivity to the surface and interface roughness as well as to the absorption of the nondiamond phase of the film is demonstrated. Several values of the percentage of the nondiamond phase can be obtained, with the same fit quality, however, depending on the amorphous carbon reference used in the model. These references were obtained by performing SE measurements on various amorphous carbon films. Finally, our SE analysis has allowed us to monitor the lateral homogeneity of the thickness, surface and interface roughness and nondiamond phase concentration over the diamond film. 相似文献