The High-Efficient Low-Cost Wheel-Grinding Technology for CVD Diamond Films

2007 ◽  
Vol 24-25 ◽  
pp. 295-302 ◽  
Author(s):  
Zhu Ji Jin ◽  
Xing Wei Ma ◽  
Ze Wei Yuan
Keyword(s):  
Low Cost ◽  
Diamond Films ◽  
Cvd Diamond ◽  
Chemical Polishing ◽  
High Tech ◽  
Diamond Polishing ◽  
High Efficient ◽  
Promising Perspective ◽  
Key Techniques

CVD diamond films have been used in many high-tech fields with the industrial and scientific developments, while the lagging of the polishing technology for the CVD diamond films has limited their widely applications. This paper presents a high-efficient low-cost wheel-grinding technology for CVD diamond polishing, and the two key techniques of this technology are introduced in detail based on thermo-chemical polishing technology. Furthermore, wheel grinding technology exhibits a promising perspective for the widely application in the diamond films.

Surface conversion reaction and high efficient grinding of CVD diamond films by chemically mechanical polishing

2018 ◽  
Vol 44 (17) ◽  
pp. 21641-21647 ◽  
Author(s):  
Hanqing Xu ◽  
Jianbing Zang ◽  
Pengfei Tian ◽  
Yungang Yuan ◽  
Yanhui Wang ◽  
...  
Keyword(s):  
Diamond Films ◽  
Cvd Diamond ◽  
Mechanical Polishing ◽  
Conversion Reaction ◽  
High Efficient ◽  
Surface Conversion

DEPOSITION OF SINGLE-PHASE CuInSe2 THIN FILMS UNDER LOW VACUUM LEVEL BY A TWO-STAGE GROWTH TECHNIQUE

2009 ◽  
Vol 16 (03) ◽  
pp. 381-386 ◽  
Author(s):  
J. B. CHU ◽  
H. B. ZHU ◽  
Z. A. WANG ◽  
Z. Q. BIAN ◽  
Z. SUN ◽  
...  
Keyword(s):  
Solar Cells ◽  
Single Phase ◽  
Low Cost ◽  
Control Process ◽  
Rf Magnetron Sputtering ◽  
Chalcopyrite Structure ◽  
Sputtering Deposition ◽  
Vacuum Level ◽  
X Ray ◽  
High Efficient

Single-phase CuInSe 2 films were grown by high vapor selenization of CuIn alloy precursors within a partially closed graphite box. The CuIn precursors were prepared using Cu x In y alloy targets with different composition rates under low vacuum level by a homemade sputtering system. The Cu and In composition rates of the used targets are 11:9, 10:10, and 9:11, respectively. The metallic precursor films were selenized using a two-step temperature profile, i.e. at 250°C and 400–500°C, respectively. The influence of the temperature at the second selenization step on the quality of the CIS absorbing layers was investigated. The CIS films were characterized by X-ray diffractometry, scanning electron microscopy, energy dispersive X-ray analysis, and Raman spectroscopy. The deposited CIS absorbers selenized at a high temperature of 500°C for 30 min exhibited a single-phase chalcopyrite structure with a preferential orientation in the (112) direction. These layers display uniform, large, and densely packed crystals with a grain size of about 3–5 μm. Cadmium sulfide buffer layer was manufactured by chemical bath deposition method. Bilayers ZnO / ZnO : Al were prepared by RF magnetron sputtering deposition. CIS solar cells with an efficiency of about 6.5% were produced without antireflective films. The method to fabricate CIS solar cells by a combination of the low vacuum sputtering deposition and the graphite box selenization process has provided a simple control process and shown a promising potential for developing high efficient and low-cost CuInSe 2 solar cells.

PTIS investigation of hydrogenated CVD diamond films

2005 ◽  
Vol 202 (11) ◽  
pp. 2171-2176 ◽  
Author(s):  
A. Hikavyy ◽  
P. Clauws ◽  
W. Deferme ◽  
G. Bogdan ◽  
K. Haenen ◽  
...  
Keyword(s):  
Diamond Films ◽  
Cvd Diamond

Investigation on the Machining of Thick Diamond Films by EDM Together with Mechanical Polishing

2007 ◽  
Vol 24-25 ◽  
pp. 377-382
Author(s):  
Rong Fa Chen ◽  
Dun Wen Zuo ◽  
Yu Li Sun ◽  
Wen Zhuang Lu ◽  
D.S. Li ◽  
...  
Keyword(s):  
Diamond Films ◽  
Polycrystalline Diamond ◽  
Mechanical Polishing ◽  
Polishing Process ◽  
Two Stage ◽  
Efficient Manner ◽  
Raman Scattering Spectroscopy ◽  
Electro Discharge Machining ◽  
Diamond Polishing ◽  
Cost Efficient

Although research on various diamond polishing techniques has been carried for years, some issues still need to be examined in order to facilitate application on large areas in a cost-efficient manner. A compositive technique for machining efficiently thick diamond films prepared by DC plasma arc jet is reported in the present paper. A two-stage polishing was applied on thick polycrystalline diamond films, by employing first electro-discharge machining (EDM) for rough polishing and subsequently mechanical polishing for finishing operations. Experimental results obtained clearly indicate the applicability of the proposed two-stage technique for fabricating transparent diamond films that can be used for the production of X-ray windows. Appropriate etching with EDM is an effective pretreatment method for enhancing the efficiency of rough polishing process in mechanical polishing of thick diamond film. The machined surfaces of diamond films are studied by Scanning Electron Microscope (SEM) and Raman Scattering Spectroscopy (Raman).

Enhanced Tribological Performance of CVD Diamond Films Enabled by Using Graphene Layers as Solid Lubricant

2016 ◽  
Vol 1136 ◽  
pp. 573-578 ◽  
Author(s):  
Su Lin Chen ◽  
Bin Shen ◽  
Fang Hong Sun
Keyword(s):  
Tungsten Carbide ◽  
Solid Lubricant ◽  
Diamond Films ◽  
Cvd Diamond ◽  
Tribological Performance ◽  
Chemical Vapor Deposition Method ◽  
Dry Sliding ◽  
Graphene Layers ◽  
Sliding Interface ◽  
Graphene Flakes

The present study reports the influence of graphene layers on the tribological performance of CVD diamond films when they are used as the solid lubricants. Friction tests are conducted on a ball-on-plate friction tester, where the stainless steel is used as the counterpart material. The CVD diamond film sample is a typical microcrystalline diamond (MCD) coating which is deposited on a flat tungsten carbide substrate using the hot filament chemical vapor deposition method (HFCVD). Besides the MCD sample, a polished MCD film (pMCD) and a polished tungsten carbide (pWC) are also adopted in frictional tests, aiming at illustrating the influence of the surface morphology, as well as the physical property, of the sample on the lubricative effect of graphene layers. The experimental results show that graphene layers can effectively reduce the coefficient of friction (COF), regardless of the samples. The MCD sample presents the lowest stable COF, which is 0.13, in dry sliding period when the graphene flakes are sparyed on the sliding interface; while the pMCD and pWC samples exhibit slightly higher COFs, which are 0.16 and 0.18, respectively. Comparatively, the COFs of these three samples obtained in dry sliding process without graphene are 0.20, 0.25 and 0.64. In additon, the MCD sample exhibits a much longer stable dry slidng process which is more than 5000 cycles. Comparatively, the other two tribo-pairs only exhibit a stable low-COF dry sliding period for around 2000 cycles. The reduction of COF could be attributed to the graphene flakes adhered on the sliding interface. It forms a layer of solid lubricative film with extremely low shear strength and significantly decreases the interactions between two contacted surfaces. The rugged surface of the MCD film provides sufficient clogging locations for graphene flakes, which allows the generated lubricative film enduring a long sliding duration. It can be arrived from this study that the tribological properties of the MCD film could be enhanced by simply adoping graphene layers as a solid lubricant. Furthermore, an improved performance of a variety of MCD coated cutting tools or mechanical components could be expected when they are utilized with graphene layers.

Application of Ion Beam Enhanced Deposition to Metallization of CVD Diamond Films

1998 ◽  
Vol 169 (1) ◽  
pp. R5-R6 ◽  
Author(s):  
N. B. Wong ◽  
G. Q. Li ◽  
S. M. Zhu ◽  
S. C. Tjong ◽  
S. T. Lee
Keyword(s):  
Ion Beam ◽  
Diamond Films ◽  
Cvd Diamond

Interface formation and properties of α-NPD thermally deposited on CVD diamond films

2003 ◽  
Vol 216 (1-4) ◽  
pp. 106-112 ◽  
Author(s):  
Min-Seung Chun ◽  
Tokuyuki Teraji ◽  
Toshimichi Ito
Keyword(s):  
Diamond Films ◽  
Cvd Diamond ◽  
Interface Formation

Key Techniques of Integral Lifting of Steel Tube Arch for Zhuzhou Bridge in Baise

2013 ◽  
Vol 694-697 ◽  
pp. 3040-3044
Author(s):  
Yan Feng Luo
Keyword(s):  
Low Cost ◽  
Steel Tube ◽  
Combined System ◽  
Construction Sequence ◽  
Synchronous System ◽  
Rigid Frame ◽  
Key Techniques

Superstructure of Zhuzhou Bridge in Baise is a combined system with strong beam and weak arch. It is combined by concrete arches of continuous rigid frame-steel tube. The construction sequence is first the beam then arch, finally the temporary pier is demolished to form the combined system. The middle three parts of steel tube arch rib in the middle span were assembled to a large unity, and it was integrally lifted by synchronous system of hoisting jack to reach positive stop. The techniques have the characteristics of fast, safe and low cost.

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