Silicon nitride-based ceramics

Silicon nitride-based ceramics have approximately twice the fracture toughness of alumina-based ceramics. Their fracture toughness is nearly the same as some carbide grades. Silicon nitride ceramic enables the user to perform productive high speed machining where traditional ceramic grades could not perform, including milling cast iron and interrupted cutting with scale.

Gray cast iron, Roughing

Gray cast iron, Roughing

Silicon nitride-based ceramics

SX6

Premium Silicon Nitride

SX6

Features
  • Excellent wear resistance in applications where notch wear appears
  • Stable tool life in the applications where thermal shock resistance is required : such as WET machining or milling
  • Long tool life and high productivity at high cutting speed
Grade Work material Application Purpose Cutting speed (SFM) Feed
(IPR / IPT)
Depth of cut (inch) DRY WET
SX6 Cast iron Turning Rough 1800-3500 .012-.024 .020-.140
Milling Rough 1500-4200 .003-.010 .020-.140
Brake rotor
Gray cast ironBrake rotor
2400 SFM
.025 IPR
.080" DOC
DRY
NTK : SX6 150 pcs
Competitor's
silicon nitride ceramic
100 pcs
Cylinder block
Gray Cast IronCylinder block
3300 SFM
.0043 IPT
.080" + .040" DOC
Residual coolant
NTK : SX6 150 pcs
Competitor's
solid CBN
150 pcs

SP9

High Speed machining with low cutting forces

SP9

Features
  • Excellent wear-resistance and chipping resistance with CVD coated high-strength silicon nitride-based ceramic
  • Achieves lower tool pressure with minimal edge preparation
  • Also usable for finishing
Grade Work material Application Purpose Cutting speed (SFM) Feed
(IPR / IPT)
Depth of cut (inch) DRY WET
SP9 Gray cast iron Turning Rough-Finish 1200-2700 .012-.024 -.140
Milling Rough-Semi finish 1200-2500 .003-.010 -.240
Ductile cast iron Turning Rough-Finish 800-1800 .006-.016 -.120
Milling Rough-Semi finish 2100-3000 .003-.010 -.240
Brake rotor
Gray cast ironBrake rotor
1800 SFM
.016 IPR
DRY
NTK : SP9 120 pcs
Competitor's
silicon nitride
80 pcs
Mount bracket
  Comp.
carbide
SP9 Mount bracket
Cutter 7 tooth 10 tooth
Cutting speed
(SFM)
490 1820
Feed (IPT) .008 .005
Depth of cut
(inch)
.080+.080
  DRY
NTK : SP9 390 pcs with 3.6times higher productivity
Competitor's
carbide
180 pcs