WA1/WA5Roughing (no scale) to semi-finishing heat resistant alloys | Whisker ceramic

High-speed machining not achievable with carbide tools

High speed and efficienct machining of heat resistant alloys

SiC fibers in the material provide strength, flank wear resistance and thermal shock resistance


  • Alumina ceramic material with enhanced toughness due to the addition of SiC whiskers
  • High-speed machining is possible due to flank and notch wear resistance and toughness

Tooling application

Roughing (no scale) to semi-finishing heat resistant alloys

Grade characteristics

Cutting conditions

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Grade Material Operation type Machining Cutting speed (m/min) Feed(mm/rev) DOC(mm) Coolant
WA1/WA5 Heat resistant alloys Turning Roughing 180 - 300 0.12 - 0.25 1.0 - 2.5 WET
Profiling / Semi-finishing 180 - 330 0.1 - 0.25 1.0 - 2.0
Grooving 0.05 - 0.10 -
Milling Indexable 600 - 1000 0.07 - 0.12 1.0 - 2.5 DRY

Why are Sialon ceramics so effective at high-speed machining of heat resistant alloys?

Silicon nitride (Si3N4) is combined with Aluminum (Al) and oxygen (O) to make SiAlON.
Sialon has needle-shaped particles similar to that of Silicon nitride.
The arrangement of these particles makes the material withstand the impact force during cutting.
The addition of the alumina improves its heat resistance characteristics.
The property advantages makes it perfect for machining heat resistant alloys.

Whisker ceramic structure

The addition of the silicon carbide (SiC) to alumina greatly improves the strength of material.
Prevents the progression of cracks caused by impact forces during machining.

Inconel 718 Profiling

[ Cutting conditions ]
Material : Inconel718 (Semi-finishing)   Cycle time : 5.0 min  vc = 240m/min  F = 0.15mm/rev   ap = 1.0mm, Wet
[ Tools used ]
Insert used : RPGX120700

Case study

Jet engine part
Material :
Cutting speed :
200 m/min
Feed :
0.10 mm/rev
0.30 mm
Coolant :

80㎜ / corner (Consistent performance)

Competitor's whisker ceramic

80㎜ / corner (Streaks visible on part surface)

WA5 had stable machining performance compared to competitor's whisker grade.
Gas turbine case
Material :
Cutting speed :
800 m/min
Feed :
0.10 mm/rev
2 mm
Coolant :

1 pass = 2min

Competitor's carbide end mill
1 pass = 60min
WA1 significantly reduced cycle time compared to the competitor's carbide end mill.

Tool lineup

View Catalog Information

Please check product catalog for tooling lineup