4J29/4J36/4J42
4J29 alloy is also called Kovar alloy. The alloy has a linear expansion coefficient similar to that of silicon-boron hard glass at 20~450 ℃, a higher Curie point and good low temperature structural stability. The oxide film of the alloy is dense and can be well infiltrated by glass. And does not interact with mercury, suitable for use in instruments containing mercury discharge. It is the main sealing structural material for electric vacuum devices.
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- Commodity name: 4J29/4J36/4J42
4J29 alloy is also called Kovar alloy. The alloy has a linear expansion coefficient similar to that of silicon-boron hard glass at 20~450 ℃, a higher Curie point and good low temperature structural stability. The oxide film of the alloy is dense and can be well infiltrated by glass. And does not interact with mercury, suitable for use in instruments containing mercury discharge. It is the main sealing structural material for electric vacuum devices.
Product Details
4J29 Kovar alloy Chemical Composition Brand Chemical composition (mass fraction)% 4J29 C P S Mn Si Ni Cr Co Mo Cu Fe ≤ 0.03 ≤ 0.02 ≤ 0.02 ≤ 0.50 ≤0.30 28.5-29.5 ≤ 0.02 16.8-17.8 ≤ 0.02 ≤0.20 Allowance Brief introduction 4J29 alloy is also called Kovar alloy. The alloy has a linear expansion coefficient similar to that of silicon-boron hard glass at 20~450 ℃, a higher Curie point and good low temperature structural stability. The oxide film of the alloy is dense and can be well infiltrated by glass. And does not interact with mercury, suitable for use in instruments containing mercury discharge. It is the main sealing structural material for electric vacuum devices. 4J36 Inva alloy Chemical Composition Brand Chemical composition (mass fraction)% 4J36 C P S Si Mn Ni Fe ≤ 0.05 ≤ 0.02 ≤ 0.02 ≤0.30 0.2-0.6 35.0-37.0 Allowance Brief introduction 4J36 alloy is also known as INVAR (INVAR) alloy, the Curie point of the alloy is about 230 DEG C, below this temperature when the alloy is ferromagnetic, with a very low coefficient of expansion, higher than this temperature when the alloy is non magnetic, the expansion coefficient increases. 4J42 Kovar alloy Chemical Composition Brand Chemical composition (mass fraction)% 4J42 C Mn Si P S AL Co Ni Fe ≤ 0.05 ≤ 0.80 S0.30 ≤ 0.02 ≤ 0.02 ≤ 0.1 ≤ 0.1 41.25-42.25 Allowance Brief introduction Iron-nickel constant expansion alloys are a series of constant expansion alloys that can match soft glasses and ceramics with different expansion coefficients in a given temperature range by adjusting the nickel content, and their expansion coefficients and Curie points increase with the increase of nickel content.
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4J29/4J36/4J42
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