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BYP17 (4J33) has a similar linear expansion coefficient with 95% Al2O3 ceramics from -60℃ to 600℃.
Sealing between vacuum tubes and 95% Al2O3 ceramics
| Ni | 32.1~33.6 | Fe | bal. |
Co | 14.0~15.2 |
| 25℃-400℃ | 6.0~6.8 |
25℃-500℃ | 6.6~7.4 |
Tensile Strength | Soft | Hard | ||
<570 MPa (82.7 ksi) | >700 Mpa (101.5 ksi) | |||
| Hardness | Thickness | Deep-drawing State | ||
>0.2~2.5mm | ≤165HV | |||
>2.5mm | ≤170HV | |||
Gain Size | Deep-drawing State: ≥Level 7 | |||
