Controlled Expansion Alloys 4J6 For Vacuum Display Screen ASTMF31-16 42Ni-6Cr
Expansion Alloy 4J6 For The Vacuum Display Screen ASTMF31-16
4J6 is a typical glass sealing alloy, the coefficient of expansion is similar to the soft glass in the temperature range of 20~400℃. The alloy contains 6% chromium, and after oxidation treatment the alloy surface produces a very dense oxide membrane that is strongly bound to the substrate and well infiltrated with the soft glass, so that can get high strength sealing surface.
The alloy is an important sealing structure material in the electric vacuum industry, In addition, the alloy contains 42% nickel, that is why the US label is called 42Ni-6Cr (Glass sealing 42-6, UNSK94760).American Carpenter also produced the alloy that called Carpenter 42-6.
Chemical Composition(wt, %)
| C | P | S | Si | Mn | Al | Ni | Cr | Fe |
| 0.05 max | 0.020 max | 0.020 max | 0.30 max | 0.25 max | 0.20 max | 41.5-42.5 | 5.5-6.3 | Rem |
Equal Grades
- H42X6(Russia)
- 42Ni-6Cr ,Carpenter42-6 ,Sylvania4 ,Sealmet 4(USA)
- NRS-1 ,YEF-426 ,SNC(Japan)
- ASV(426) ,Ni42Cr6(France)
- Vacovit426 ,NiCr426 (German)
Physical performance
| Grade | Heat treatment | Mean line coefficient of expansion(10-6/°C) | ||
| 20-300°C | 20-400°C | 20-450°C | ||
| 4J6 | Heat to 1100 °C ± 20 °C in a vacuum or hydrogen atmosphere and temperature insulation for 15 minutes, then cooling down to below 200 °C for no more than 5 °C / minutes | 7.6-8.3 | 9.5-10.2 | - |
Density:
8.11g/cm3
Standards
ASTMF31-16(Glass sealing 42-6),YB/T 5253-2005
Available forms
Stip,Rod,pipe ,plate and tube
Application
The alloy has stable performance and used by the aviation factories long term.It is mainly used to make various electric vacuum components, such as the anode cap of the electronic beam tube, the Vacuum display Screenand so on.
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