Table 1 Mechanical performance of Si3N4 ceramic and common bearing steels
From: An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps
Item | Si3N4 | GCr15 | M50 |
|---|---|---|---|
Density (kg/m3) | 3200 | 7830 | 7972 |
Young modulus (GPa) | 310 | 219 | 218 |
Hardness HRC | 7090 | 64 | 66 |
Coefficient of thermal expansion (m/K) | 2.9 × 10−6 | 12.3 × 10−6 | 12.1 × 10−6 |
Corrosion-proof | Superior | Weak | Weak |