EuroWire January 2015

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Technical article
January 2015 44
Shanghai Jiaoyou Diamond
Coating Co Ltd
951 Jianchuan Road
Shanghai 200240
China
Tel: +86 215 473 0743
Email:
Website:
Shanghai Jiaotong University
800 Dongchuan Road
Shanghai 200240
China
Tel: +86 215 474 0000
Website:
Nano-dies are welcomed by big
manufacturers in China for the green
element of water lubricating.
5 Conclusions
Nanocrystalline diamond composite
coatings are deposited on the interior
surfaces of tungsten carbide (YG6)
drawing dies using HFCVD processes.
According to the analysis results of SEM
and Raman spectroscopy, nanocrystalline
diamond coatings also contain a useful
large percentage of multi-crystalline
diamond structures with very small grain
sizes of about 50nm and a large number of
grain boundaries. These coatings provide
very good wear resistance, high finish and
low friction with aluminium.
The application of nano-dies in the
aluminium wire or tube (coaxial cable
or aluminium-plastics compound pipe)
drawing process can not only increase
the working life of drawing dies
dramatically (10~25 times of TC dies),
largely reduce change-over time and
increase productivity, but also ensure
fundamental consistency of wire diameter
and improve the quality and finish of
drawing products, saving significant
amounts of raw material. Additionally,
nano-dies are highly adaptable to
high-speed wire drawing.
In particular, a water lubricating system can
be adopted to replace the conventional
oil-based lubricating system when using
nano-dies for producing aluminium coaxial
cable, aluminium-plastic compound pipe
and aluminium wire, providing immediate
economic benefits, reducing environmental
pollution and implementing a green
manufacturing process. n
6 References
[1] Dieler M Gruen, ‘Nanocrystalline diamond films’,
Annu Rev Mater Sci 1999, 29: 211~259
[2] Sun Fanghong, Zhang Zhiming, Guo Songshou,
Shen Hesheng et al, ‘Industrialisation of CVD
Diamond Films: Diamond coated drawing dies
and cutting tools,’ Bilateral Chinese-Russian
scientific seminar (Hangzhou), 27th-29th December
2010
[3] Zhang Zhiming, He Xianchang, Shen Hesheng,
Sun Fanghong, et al, ‘Pre-treatment for diamond
coatings on free-shape WC-Co tools,’ Diamond
and Related Materials, 2000, 9:1749~1752
[4] Zhang Zhiming, He Xianchang, Shen Hesheng,
Sun Fanghong, et al, ‘Fabrication and application
of chemical vapour deposition diamond-coated
drawing dies,’ Diamond and Related Materials,
2001,10:33~38
[5] Li Zhenquan, Zhou Yan, Liu Yang, et al, ‘Application
of nanocrystalline diamond composite coating
compacting dies,’ Electric Wire & Cable (Chinese),
2005, 2:46~48
[6] Guo Songshou, Zhang Zhiming, Shen Hesheng,
Sun Fanghong, et al, ‘Characterisation and
Application of Nanocrystalline Diamond-coated
Welding and Drawing Dies,’Optical Fiber & Electric
Cable (Chinese), 2007, 1: 9~12