OhmAlloy-4J42 (Expansion alloy)
(Common Name: 42H Glass Sealing 42, Nilo42, N42, FeNi42)
4J42 alloy is mainly composed of iron, nickel elements. It is characterized with a fixed coefficient of expansion. Increase the thermal expansion coefficient and the Curie point with increase of nickel content.
4J42 alloy is widely used the structure of the sealing material in the electric vacuum industry.
Normal composition%
Ni | 41.5~42.5 | Fe | Bal. | Co | - | Si | ≤0.3 |
Mo | - | Cu | - | Cr | - | Mn | ≤0.8 |
C | ≤0.05 | P | ≤0.02 | S | ≤0.02 | Al | ≤0.1 |
Typical Physical properties
Density (g/cm3) | 8.12 |
Electrical resistivity at 20℃(Ωmm2/m) | 0.61 |
Thermal conductivity, λ/ W/(m*℃) | 14.6 |
Curie pointTc/ ℃ | 360 |
Elastic Modulus, E/ Gpa | 147 |
Coefficient of expansion
θ/℃ | α1/10-6℃-1 | θ/℃ | α1/10-6℃-1 |
20~100 | 5.6 | 20~400 | 5.9 |
20~200 | 4.9 | 20~450 | 6.9 |
20~300 | 4.8 | 20~500 | 7.8 |
20~350 | 4.95 | 20~600 | 9.2 |
OhmAlloy-4J42 (Expansion alloy)
(Common Name: 42H Glass Sealing 42, Nilo42, N42, FeNi42)
4J42 alloy is mainly composed of iron, nickel elements. It is characterized with a fixed coefficient of expansion. Increase the thermal expansion coefficient and the Curie point with increase of nickel content.
4J42 alloy is widely used the structure of the sealing material in the electric vacuum industry.
Normal composition%
Ni | 41.5~42.5 | Fe | Bal. | Co | - | Si | ≤0.3 |
Mo | - | Cu | - | Cr | - | Mn | ≤0.8 |
C | ≤0.05 | P | ≤0.02 | S | ≤0.02 | Al | ≤0.1 |
Typical Physical properties
Density (g/cm3) | 8.12 |
Electrical resistivity at 20℃(Ωmm2/m) | 0.61 |
Thermal conductivity, λ/ W/(m*℃) | 14.6 |
Curie pointTc/ ℃ | 360 |
Elastic Modulus, E/ Gpa | 147 |
Coefficient of expansion
θ/℃ | α1/10-6℃-1 | θ/℃ | α1/10-6℃-1 |
20~100 | 5.6 | 20~400 | 5.9 |
20~200 | 4.9 | 20~450 | 6.9 |
20~300 | 4.8 | 20~500 | 7.8 |
20~350 | 4.95 | 20~600 | 9.2 |
