CERATIZIT - инструмент для обработки камня 2016 EN
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GRADES
GENERAL GRADE OVERVIEW – GRADE PROPERTIES
15
The graphic illustrations below show that the mechanical
properties of the carbide mainly depend on the binder content
(Co) and the TC grain size. Hardness, i.e. wear resistance,
increases inversely proportional to the fracture toughness.
This means that the harder the material the more it reacts
to notch tensions and impact stress (the ‘impact resistance’
parameter, which cannot be precisely defined, correlates with
the fracture toughness of the material).
On the other hand, the transverse rupture strength does not
directly depend on the hardness but rather on the TC grain
size and the cobalt content. The adhesive wear (tendency to
stick), however, decreases with the grain size and the cobalt
content of the carbide used. The list of the mentioned interde-
pendencies, which could be extended at will for other wear and
failure mechanisms, show that it is only possible to choose the
correct carbide grade following a systematic procedure and/or
based on experience with similar applications.
Ultrafine grades
10µm
3000
2500
2000
1500
1000
500
0
5 10 15 20 25 30 Co [%]
Submicron grain
Fine / medium grain
Coarse grain
10µm
10µm
10µm
4500
4000
3500
3000
2500
2000
1500
0
5 10 15 20 25 30 Co [%]
25
20
15
10
5
0
0 5 10 15 20 25 30 Co [%]
Ultrafine grade
Fine / medium grain
Submicron grain
Coarse grain
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