Page 55 - Iscars_World_Brochure_2018

Nano layered PVD coating Examples from ISCAR’s material group
PVD coatings were introduced during the late 1980’s. classification system:
Applying advanced nanotechnology, PVD coatings
performed a gigantic step in overcoming complex Letter Definition
difficulties. Scientific developments resulted in a new IB CBN
class of wear-resistant nano layered coatings - a
combination of layers with a thickness of up to 50 nm IC Cemented carbide and cermet
(nanometers) that demonstrate significant increases in ID PCD
coating strength compared to conventional methods.
IS Ceramics
Applying SUMO TEC technology DT Cemented carbide with dual
SUMO TEC is a specific post-coating treatment (CVD+PVD) coating
process developed by ISCAR to improve both CVD
and PVD coatings: CVD and PVD. In CVD coatings,
the difference in thermal expansion coefficients
between the substrate and the coating layers causes
internal tensile stresses and micro cracks. PVD
coatings produce surface droplets. These factors
negatively affect the coating and shorten insert
tool life. The SUMO TEC treatment has the effect
of making coated surfaces even and uniform by
reducing and even removing the defects - minimizing
inner stresses and droplets in the coating.

Classifying Grades
ISCAR, which produces a variety of cutting tools
with cutting parts mainly fabricated from coated
and uncoated cemented carbide, developed a
tool material grade characterization system with
designated letters indicating the material group and
numbers representing identity codes. The numbers
also provide quick information on the grade type -
for example a two-digit number following “IC” in the
designation of a cemented carbide grade means that
it is an uncoated grade, while a three-digit number
relates to a coated grade.

Occasionally, misconceptions occur concerning
grade designation for a coating type. IC300, for
example, relates to the specific grade in its entirety
– including both the grade substrate and coating.
Wording such as “grade IC328 but with coating
IC300” is inaccurate; the correct definition would
be “substrate as in grade IC328 and coating as
in grade IC300”.

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