Preparation of α‐Si 3 N 4 by direct nitridation using polysilicon waste by diamond wire cutting

2019 ◽  
Vol 17 (1) ◽  
pp. 84-93 ◽  
Author(s):  
Yong Hou ◽  
Guo‐Hua Zhang ◽  
Kuo‐Chih Chou
Keyword(s):  
Diamond Wire ◽  
Wire Cutting ◽  
Direct Nitridation

Abrasive Water-Jet and Diamond Wire-Cutting Technologies Used in the Removal of Marine Structures

2000 ◽  
Author(s):  
John W. Brandon ◽  
Bob Ramsey ◽  
James W. Macfarlane ◽  
David Dearman
Keyword(s):  
Water Jet ◽  
Abrasive Water Jet ◽  
Marine Structures ◽  
Diamond Wire ◽  
Wire Cutting

Surface chemical-bonds analysis of silicon particles from diamond-wire cutting of crystalline silicon

2016 ◽  
Vol 120 (23) ◽  
pp. 235308 ◽  
Author(s):  
Anass Benayad ◽  
Hamza Hajjaji ◽  
Fabrice Coustier ◽  
Malek Benmansour ◽  
Amal Chabli
Keyword(s):  
Crystalline Silicon ◽  
Chemical Bonds ◽  
Surface Chemical ◽  
Diamond Wire ◽  
Wire Cutting ◽  
Silicon Particles

Impurity Removal from Diamond-Wire Cutting Waste by Slag Refining and Electromagnetic Stirring

JOM ◽  
2020 ◽  
Vol 72 (7) ◽  
pp. 2648-2655 ◽  
Author(s):  
Yunyang Zhu ◽  
Jijun Wu ◽  
Qiliang Wang ◽  
Wenhui Ma ◽  
Kuixian Wei ◽  
...  
Keyword(s):  
Electromagnetic Stirring ◽  
Diamond Wire ◽  
Impurity Removal ◽  
Slag Refining ◽  
Wire Cutting

The Restoring of Dismissed Offshore Oil Plants by a Remotely Operated Robotic Platform

Volume 2 ◽  
2004 ◽  
Author(s):  
Emanuele Cavallo ◽  
Rinaldo C. Michelini ◽  
Rezia M. Molfino
Keyword(s):  
Remote Monitoring ◽  
Cycle Performance ◽  
Monitoring And Control ◽  
Robotic Platform ◽  
Diamond Wire ◽  
Sea Bottom ◽  
Work Cycle ◽  
Wire Cutting ◽  
Overall Efficiency ◽  
And Control

The paper gives an overview of the research project SBC (contract n° GIRD-CT-2000-03007), aimed at the environment protection and rehabilitation, by means of an innovative robotic equipment, purposely developed with active interaction between academia and industries, showing joint issues as for scientific, technological, economic, social and cultural aspects, along the challenging track to eco-consistency. The falls-off bring forth:- a new technology: the sub-bottom wire cutting; - a reliably tailored set-up: the robotic platform; - a low-impact duty-scheme: the dig-and-saw process; - a safe work-cycle: the remote monitoring and control. The Sub Bottom Cutter, SBC, approach grants highly conservative decommissioning operations of dismissed submerged offshore structures. Due to surrounding hostility (pressure, temperature, pollution, ...), the robot is remotely controlled from the surface, where a human operator monitors the task advance intervening if any snag occurs. The equipment uses the diamond wire technology (DWT) to cut the pile foundations beneath the sea bottom. The result is the full removal of the structure, which may be made by steel, concrete or a combination of the two, and the consequent restoration of the underwater environment, according to the enacted laws and regulations. The project originality relies on combining and improving known and co-operating technologies, namely: diamond wire cutting and sub-bottom operation; robot-based tools and remote monitoring and control. This leads to the never attempted task of shearing below sea bottom in a hostile environment by a low-impact duty-scheme (dig-and-saw), through reliable and safe process (unmanned work-cycles). The prospected technique allows the environmentally safe disposal of offshore installations (wellheads, platforms, terminals and sea-lines), as well as marine and harbour structures, limiting the volume of the seabed excavation to less than 10 m3 per each access to the structure to be cut, like, jacket piles or wellheads, etc.. The excavated volume of the solid materials per single dig is estimated to be 100–150 times less than the one removed by conventional dredge systems. Moreover, sub-bottom diamond wire cutting leaves mainly unaltered the surroundings, with most of metal discharges trapped at the operation site. The project was successfully fulfilled, and a prototypal equipment has been tested during July 2003, within a marine surroundings, properly accomplishing the cutting sequence. The paper presents an overall discussion of the technical background required by the case peculiarities, and summarises the main design incumbents faced for the ideation and the construction of the robotic platform. Emphasis equally focuses on the structural checks and on the work-cycle performance, with due account of the task specification, the prototype definition, the conditioning computational and experimental checks and the basic monitoring and overseeing environment asuuring reliable remote govern. The key benefits of the finally achieved prototype show the very relevant outcomes of the solution, such as: the use of a clean process, not interfering with the equilibrium of the marine habitat; the integrated design of mechanics, hydraulics and the underwater functional components; the unmanned operation, ruled by an intelligent remote control/drive station on surface; the guarantee of the completion of the cutting task, provided by remote monitoring; the previous assessment of life-cycle performance, by digital prototyping and virtual testing; the optimisation in terms of environmental impact, overall efficiency and system reliability for the use underwater, and the low energy consumption in relation to the total power applied (250/300 kW); the unaltered overall efficiency of removed structures and materials characteristics involved in the cutting process, thus allowing the re-use for the same or different work-scopes; the noteworthy efficiency of the dig-and-saw process, and the comparative low over-all costs. The presentation offers a noteworthy example where the integrated desing grants the successful merging of technologies, to efficiently and reliably fulfill demanding duties. The demand to restore uncontaminated conditions of marine sites modified by men activity and the global spreading of off-shore reclamation tasks require international concern, as, today, proper technologies are missing as for human and for environment safety. The urgency follows, in view of the European sustainability programmes and the North Sea case. In such a context, the prospected development could be winning reference.

RESEARCH OF THE GEOMETRIC PARAMETERS CHANGING DURING SEPARATION THE HIGH-STRENGTH STONES MONOLITES WITH DIAMOND WIRE MACHINES

2021 ◽  
pp. 7-14
Author(s):  
Sergii Bashynskyi ◽  
◽  
Volodymyr Kotenko ◽  
Maryna Kolodiy ◽  
Viktor Pidvysotskyi ◽  
...  
Keyword(s):  
Experimental Studies ◽  
High Strength ◽  
Geometric Parameters ◽  
Cutting Process ◽  
Practical Significance ◽  
Diamond Wire ◽  
Wire Cutting ◽  
The Wire ◽  
The Relationship ◽  
Free Section

Aim. Developing the theory of diamond wire cutting of crystalline rocks for separating the facing stone blocks from the array by establishing links between individual geometric parameters of the side and the cutting process. Research methods. To achieve this aim were used the next method: analytical studies of the relationship between the geometric parameters of the process of diamond wire cutting, experimental study of the same geometric parameters of the process of diamond wire cutting of high-strength rocks to confirm or refute previously obtained analytical relationships, and statistical processing of data. Results. The length of contact of the diamond wire with the rock is an important criterion for the process of separating the blocks of facing rocks from the array. Given the unavailability of the diamond wire side in the array for direct measurement methods, there is a need for indirect determination of the contact length. It is proposed to use the length of the free section of the wire, as the total length of the wire remains unchanged during the cutting process. It is assumed that the length of the free section can be estimated by the distance between the diamond wire machine installation and the slope of the ledge. Analytical dependences between the specified sizes are considered. The existence of the obtained dependences and the strength of the correlation connection was confirmed by experimental studies in the conditions of the block quarry of the facing stone. Scientific novelty. At first time, the relationship between the distance of the diamond wire machine installation and the side of the diamond wire and the length of the free section of the diamond edging, which allows to control the length of contact of the diamond wire with rock in the cut. The obtained dependence is analyzed and it is concluded that the geometric parameters of the ledge will affect the length of the cut only in the initial stages of separation of the block of natural stone from the array. In the next stages, the length of the free section of the diamond wire depends only on the distance of the location of the diamond wire machine installation and the side of the diamond rope. Practical significance. The value of the optimal initial distance of the diamond wire machine placement to the slope of the ledge is found. The empirical dependence of the length of the free section of the diamond wire on the location of the diamond wire machine is also obtained

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