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Hybrid Coatings with Boron Break the Rule Tibor Cselle, Andreas Lümkemenn - PLATIT AG, Selzach, Switzerland Mojmir Jilek, PLATIT as, Sumperk, Czech Republic
Of the
classic, conventional tool coatings, two must be
emphasized. It started with the UNICUT (TiAlCN),
which is still widely used for milling cutters by
Fraisa (Bellach, CH) [2]. In addition to milling
cutters, the coating can be also found on many
sawing tools, e.g. on the saw bands of Wikus
(Spangenberg, DE) [3].. Without carbon with a
multilayer structure, the UniversAl layer was
arised, which was then further developed at
Guhring (New Berlin, WI, USA) for FIREX and is
still considered as one of the best coatings for
drilling [4]. It took almost 10 years for PLATIT
to bring groundbreaking news again. The TiAlN
grains are embedded in an amorphous matrix of
silicon nitride, resulting in nanocomposite layers
[5]. The most famous of these is the nACo-blue,
which was chosen by YG1 (Incheon, KR) to be a hit
in Asia [6]. Many companies around the world have
further developed and marketed the coating, e.g.
Unimerco (Sunds, DK, [7]), Swisstek, New Berlin
(WI), USA, Melin (Parma (OH), USA, [8]). In
addition to the nanocomposites, the nanolayers
also play a very important role. LMT Fette
(Schwarzenbeck, DE) offers the "Nanosphere"
coating for its new and reground hobs worldwide
[9], [10]. Triple coatings require flexible
coating systems, which produce the three different
layer structures freely programmable, not as an
simple monobloc only according to the alloying
proportions of the used cathodes. Meanwhile, the
triple structure has become a true classic for
many coaters and users. Numerous special
adaptations appeared on the market. E.g. GFE
Schmalkalden, Germany [11] developed a nACo®3
coating for coating CBN inserts. With more
silicon than nACo®, and triple structure, the
TiXCo®3 coating opens new horizons in hard
machining (SGSO, Taizhou, CN, [12]). The quad
coatings are combinations of wear-resistant,
lubricating and oxidic layers [13]. The nACoX4® is
based on nanolayers and nanocomposites and
contains an oxidic top layer to increase the heat
resistance even further. On indexable inserts
Nanomold (Kieninger, Lahr, Germany, [14]) offers
extremely high layer thicknesses as a real
alternative for CVD layers [15]. The ALL4®-Tribo
coating (AlCrTiN / CrCN) sets the milestone by
combining several elements (Ti, Al, Cr, C). Small
and large companies use the complexity of these
layers for dedicated applications. Like JRTools
(Tikkakoski, SU, [16]) for hobbing, Mauth,
(Oberndorf, DE, [17]) for step drilling / reaming,
or Feintool (Lyss, CH, [18]) for fine
blanking. As a generally accepted rule,
increasing the hardness of the layer increases the
internal stress and thereby the fragility of the
layer. By simultaneously depositing with arcing
and sputtering, the new LACS® technology (Lateral
ARC & Central Sputtering [19]) breaks this rule
(Figure 2). Sputtered boron (made of TiB2 or B4C)
plays an important role in this process, which
simultaneously forms nanocomposite layers with the
arced materials (such as Al, Ti, Cr). The new
layers (BorAC: AlCrTiN / BN, BorAT: AlTiN / BN)
are taking their first steps in industrial
practice. The characteristic features of the
layers and the first results raise great
expectations and undoubtedly point to an important
new milestone [20]. References [1]
Compendium PLATIT AG, Selzach, 60th
edition, 9/2018 [2]
http://www.fraisa.com [3]
https://www.wikus.de/index.php/de/futura-premium [4]
http://e.guhring.com/ProductsServices/CoatingServi
ces/FIREX/ [5] Veprek, S., Jilek, M.: Super-
and Ultra Hard Nanocomposite Coatings
Vacuum, 67 (2003) p. 443-449 [6]
https://issuu.com/yg-1/docs/yg-1_fraeser [7]
https://www.kyocera-unimerco.de/C7 PLUS
Nanocomposite coating [8]
http://swiss-tekcoatings.com/,
http://www.melin/endmill.com [9] Lümkemann,
A., u.a.: A new generation of PVD coatings for
high performance gear hobbing
Conference THE “A” COATINGS, Thessaloniki, Greece,
Oct/2014 [10]
http://www.frezyslimakowe.pl/pliki/nanosphere.pdf<
p>[11] http://www.gfe-net.de [12]
http://www.sgsotools.com [13] Morstein, M.
u.a.: LARC-Deposited AlCr-Based Oxynitride
Coatings ICMCTF, F5-5, San Diego, USA,
5/2011 [14]
https://de.slideshare.net/LMTGroup/fachartikel-nan
omold-gold [15] Habermeier, J.: Technologische
Untersuchungen der Bearbeitung nickelreduzierter
Strahlgusslegierungen für Turbingehäuse
Vulkan Verlag, ISF Dortmund – Daimler AG,
Stuttgart, 2017 [16]
http://www.jrtools.fi [17]
https://mauth-gmbh.de/ [18]
https://www.feintool.com/de/unternehmen/premium-pa
rtner/ [19] Cselle, T., u.a.: From Start-Up to
Hybrid-Revolution Werkzeug-Technik, No.
163, Sept/2017 [20] Lümkemann, A., Jilek, M. jr.
u.a.: Wear resistant nanostructured PVD coatings
for industrial use IUVSTA Workshop,
Vadstena, SE, Sept/2018
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Artikel erschienen in WT 169 auf Seite 108.
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