Silicon Nitride — Si3N4
Silicon nitrides have a unique grain structure which delivers both high strength, toughness and very good thermal shock resistance — making it ideal for applications with high dynamic stresses, thermal stress, and high reliability requirements. This unique combination of material properties provides advantages in severe-service applications such as turbines and high-end ball bearings.
Primary Features
- Wear resistance
- Corrosion resistance
- High mechanical strength and toughness
- Electrically insulating
- Thermal shock resistance
Applications
- Wear-resistance components
- Semiconductor manufacturing equipment components
- High-temperature components
Material
- KMT-SiN — Si3N4 (black)
Material Properties for KemaTek™ Silicon Nitride
| Properties | Units | Test | Silicon Nitride — Si3N4 |
| Material Name | KMT-SiN | ||
| Color | Black | ||
| Primary Material Content | — | ||
| Characteristics | Lightweight, high wear resistance, and high heat resistance | ||
| Applications | Heat, wear, and corrosion-resistant components | ||
| Bulk Density | g/cc | ASTM-C20 | 3.20 |
| Water Absorption | % | ASTM-C373 | 0 |
| Vickers Hardness (Load 500 g) | GPa | ASTM-C1327-03 | 13.9 |
| Flexural Strength | MPa | ASTM-C1161-02c | 610 |
| Compressive Strength | MPa | ASTM-C773 | 3850 |
| Young’s Modulus of Elasticity | GPa | ASTM-C1198-01 | 290 |
| Poisson’s Ratio | — | ASTM-C1198-01 | 0.28 |
| Fracture Toughness | MPa * m12 | ASTM-C1421-01b (Kevron notched beam) | 5 |
| Coefficient of Linear Thermal Expansion, 40-400 ℃ | x 10-6/℃ | ASTM-C372-94 | 2.6 |
| Thermal Conductivity, 20℃ | W/(m • K) | ASTM-C408-88 | 23 |
| Specific Heat | J/(Kg • K) x 103 | ASTM-E1269 | 0.66 |
| Thermal Shock Resistance | ℃ | Note 1 | 550 |
| Volume Resistivity, 20℃ | Ω • cm | ASTM-D257-99 | ≥1024 |
| Dielectric Strength | KV/mm | ASTM-D149-97 | 13 |
| Dielectric Constant, 1 MHz | — | ASTM-D150-98 (1 MHz) | — |
| Loss Tangent | (x 10-4 | ASTM-D150-98 (1 MHz) | — |
| Nitric Acid 60% 90℃ | WT Loss (mg/cm2/day) | — | < 1.0 |
| Sulphuric Acid 95%, 95℃ | WT Loss (mg/cm2/day) | — | < 0.40 |
| Caustic Soda 30%, 95℃ | WT Loss (mg/cm2/day) | — | < 0.36 |
Ceramic Materials Properties Chart — All Materials — PDF, 128K
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