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- Technical Information
- Cutting tool materials
CUTTING TOOL MATERIALS
Cemented carbide (WC-Co) was developed in 1923 and was later improved by adding TiC and TaC. In 1969, CVD coating technology was developed, and coated carbide has since been used widely. TiC-TiN based cermet was developed in 1974. Today, "Coated Carbide grades for roughing and cermet for finishing" is a well established trend.
GRADE CHARACTERISTICS
| Hard Materials | Hardness (Hv) |
Energy Formation (kcal/g·atom) |
Solubility in Iron |
Thermal Conductivity (W/m·k) |
Thermal * Expansion |
Tool Materials |
|---|---|---|---|---|---|---|
| Diamond | > 9,000 | - | Highly Soluble | 2,100 | 3.1 | Sintered Diamond |
| CBN | > 4,500 | - | - | 1,300 | 4.7 | Sintered CBN |
| Si3N4 | 1,600 | - | - | 100 | 3.4 | Ceramics |
| Al2O3 | 2,100 | -100 | ≒0 | 29 | 7.8 | Ceramics Cemented Carbide |
| TiC | 3,200 | -35 | < 0.5 | 21 | 7.4 | Cermet Coated Carbide |
| TiN | 2,500 | -50 | - | 29 | 9.4 | Cermet Coated Carbide |
| TaC | 1,800 | -40 | 0.5 | 21 | 6.3 | Cemented Carbide |
| WC | 2,100 | -10 | 7 | 121 | 5.2 | Cemented Carbide |
*1W/m•K=2.39×10-3cal/cm•sec•℃
