Sealing alloy
4J33 4J29 4J42
Features: 4J33 alloy and ceramic have the same coefficient of thermal expansion. They are used to seal the ceramic and make the electronic vacuum device;
The thermal expansion coefficients of 4J42 and 4J29 alloys are the same as those of glass and have the oxide film required for easy sealing.
1、Typical chemical components
| Grade | C | Si |
Mn |
P | S | Ni | Co | Fe |
| 4J33 | 0.030 | 0.12 | 0.26 | 0.006 | 0.005 | 33.10 | 14.50 | Bal |
| 4J29 | 0.015 | 0.12 | 0.25 | 0.006 | 0.005 | 29.10 | 17.30 | Bal |
| 4J42 | 0.020 | 0.20 | 0.50 | 0.006 | 0.005 | 41.70 | 0.05 | Bal |
2、Physical property
| Grade | Density（g/cm3） | Modulus of elasticity（Mpa） | Mean linear thermal expansion coefficient（10-6/℃） | Curie point（℃） | Resistivity（μΩ.cm） | Specific heat（J/kg·℃） | Thermal conductivity（W/m.℃） |
| 4J33 | 8.16 | 175x103 |
6.4（20℃-400℃）
6.9（20℃-500℃） |
440 | 44(20℃) | 398 | 18.6 |
| 4J29 | 8.17 | 165x103 |
5.0（20℃-400℃）
5.2（20℃-450℃） |
450 | 46(20℃) | 418 | 20.3 |
| 4J42 | 8.14 | 150x103 |
4.8（20℃-300℃）
6.9（20℃-450℃） |
350 | 62(20℃) | 176.8 | 15.5 |
3、Mechanical property
| Yield strength（Mpa） | Tensile strength（Mpa） | Elongation（%） | Hardness（Hv） | ||
|
4J33
|
Cold state | 698 | 785 | 5 | 235 |
| Soft state | 324 | 540 | 22 | 152 | |
|
4J29
|
Cold state | 695 | 780 | 5 | 230 |
| Soft state | 315 | 520 | 24 | 148 | |
|
4J42
|
Cold state | 642 | 740 | 8 |
215 |
| Soft state | 272 | 460 | 29 | 135 |
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