Getting to know NTK
Tooling Application Guide
New Products
Ceramics
Silicon
Sialon
Cubic Boron Nitride (CBN)
Polycrystaline Diamond
Cermet
Micro-Grain Carbide
Sliding Heads
Catalogues and Price Lists
Sales Contact
 
Can be divided into five categories:-
MIXED OR BLACK CERAMICS
NTK GRADES: HC7, ZC7
 
SILICON NITRIDE BASED CERAMICS CERAMICS
NTK GRADES: SX6
 
SIALONS
NTK GRADES: SX9
 
CUBIC BORON NITRIDE (CBN)
NTK GRADES: B36
 
POLY-CRYSTALLINE DIAMOND (PCD)
NTK GRADES: UC1, UC2
 
ALUMINIUM OXIDE OR WHITE CERAMIC
NTK GRADES: HC1, CX3, HW2
  • Pure alumina strengthened by Zirconium.
  • High hardness but relatively low strength, toughness and thermal conductivity making them prone to cracking if used with coolant.
  • Offer excellent wear characteristic making this range ideal for finish turning, boring and grooving of Cast Iron as well as
    Tube Scarfing.
MIXED OR BLACK CERAMICS
NTK GRADES: HC2, HC4, HC5, ZC4
  • Alumina with metallic phase of Titanium Carbide and Titanium Nitride which improves thermal conductivity.
  • Increased ability to cope with extreme cutting conditions.
  • Used mainly for hard part machining (up to HRC62).
  • Used extensively in Steel and bearing markets and for Cast Iron finishing operations.
  • Recent improvements has seen greater wear resistance and toughness due to higher density and reduced porosity.

The main advantage that mixed ceramic has over Cubic Boron Nitride (CBN) in hard part machining applications is the effect on part production costs. Whilst CBN has a better tool life, the cost per edge of a ceramic insert is a fraction of that of CBN (approx one twentieth) whilst feed rates (chip thickness around 0.1mm) and cutting speeds (range between 50 - 200m/min) are not significantly higher.

SILICON NITRIDE BASED CERAMICS
NTK GRADES: SX1, SX2, SX8, SP2
  • Low thermal expansion makes this range very resistant to thermal shock.
  • High breaking strength sees their use in rough turning (even with heavily interrupted cuts), boring and milling of Cast Iron.
  • Offers exceptional tool life.
  • Cutting speeds up to 1000m/min, feeds of 1mm/rev.
  • More stable in operations but tends to suffer from normal flank and crater wear rather than failures associated with white and
    black ceramics.
WHISKER REINFORCED CERAMICS
NTK GRADES: WA1
  • Pure alumina structurally strengthens from introduction of Silicon Carbide in the form of whiskers.
  • Added tensile strength and fracture toughness even at elevated temperatures.
  • Ideal for high speed machining for Nickel based Aerospace alloys e.g. Inconel 718 correspondingly greater metal rates.
SIALONS
NTK GRADES: SX5
  • Alumina substrate strengthened by Silicon Nitride.
  • A lower cost option than Whisker ceramic (but lower performance).
  • Widely specified and used in the machining of Aerospace alloys.
CUBIC BORON NITRIDE OR BOROZON
NTK GRADES: B16, B20, B22, B24
  • Is the diamond structure crystal form of Boron Nitride used mainly for engineering applications.
  • Second in hardness to diamond.
  • Ideal for hard part machining especially where small radi, interrupted cutting and small diameter boring applications are concerned.
    Used mainly for high speed machining of Cast Iron including roughing and finishing operations.
POLY-CRYSTALLINE DIAMOND
  • A synthetic single crystal diamond offering optimum performance in high speed machining of non-ferrous metals e.g. Aluminium, Zinc and Manganese alloys as well as highly abrasive non-metallic materials such as Graphite Epoxy Resin and Phenolic Fibreboards.
  • Used extensively in the production of Aluminium engine blocks.
  • Cutting speeds in the range 1000 - 3000m/min.
  • Offers excellent tool life.
Home Page