discharge cavity
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2011 ◽  
Vol 487 ◽  
pp. 160-163
Author(s):  
Shun Tong Chen ◽  
Y.C. Lai

This study presents a novel and economical compound technique that combines co-deposition with micro w-EDM for precisely developing a multiple micro diamond wheel-tools. The wheel-blank is made of diamond grit of 0-2 µm grade by electrochemical technique, in which employs a designed micro tank with ideal convection and mini porous carrier. Using a pore size of 5-10-µm in the porous carrier, a suitable interval chip-pocket of 2-3 µm on wheel-blank can generate naturally. Formation of the multiple wheel-tools is carried out via the processes of slicing, thinning and dressing simultaneously to become grinding edges array. A circuit of resistance capacitance, which provides a very short pulse and high peak, is employed as the electrical discharge power to help in achieving a very shallow and narrow discharge cavity. The thickness of each grinding edge can be machined down to 10-µm. The experimental result shows that the proposed technique is an effective method to fabricate precision micro diamond wheel-tools.


2011 ◽  
Vol 23 (8) ◽  
pp. 2257-2261
Author(s):  
秦风 Qin Feng ◽  
丁恩燕 Ding Enyan ◽  
宋法伦 Song Falun ◽  
常安碧 Chang Anbi ◽  
罗敏 Luo Min ◽  
...  

2007 ◽  
Vol 1018 ◽  
Author(s):  
Yaser Abdi ◽  
Mehdi Sadeghi ◽  
Shams Mohajerzadeh ◽  
Javad Koohsorkhi ◽  
Bahman Hekmat-Shoar

AbstractPECVD-grown carbon nanotubes on (100) silicon membranes have been realized and exploited for electron and ion emission applications. The growth of CNT's is achieved by a mixture of hydrogen and acetylene gases in a CVD reactor and a 5-10nm thick nickel is used as the seed for the growth. The presence of a DC-plasma yields a vertical growth of carbon nanotubes. The as-grown nanotubes are encapsulated by means of an insulating TiO2 layer. The formation of a thin membrane is possible by means of a chemical anisotropic etching technique. The membrane is then removed from the back side to fully suspend the CNT-holding TiO2 layer. Upon exposure to a plasma ashing step the nanotubes are partially removed and a both-end opened hollow nanostructure is formed which can be used as a miniaturized ion source. The CNT-holding substrate can be exploited as a grid to extract the ions from an ionization chamber just underneath the membrane. Applying a proper accelerating electric field, positive ions made inside a DC discharge cavity can form a beam-shape emission of ions towards the opposite negative electrode. The beam is well suited for a source of ion lithography. In which, the emission has the ability of direct writing on a photo-resist coated substrates. Preliminary nano-scale dots have been created with sizes between 50 and 80nm. Scanning electron microscopy has been used to investigate the results.


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