4J9 Alloy Overview:
Alloy 4J9 is a metal material with excellent properties, which is characterized by a coefficient of expansion similar to that of hard glass over a wide temperature range (-80 to 450). This makes it ideal for the manufacture of highly hermetic components in the electric vacuum industry. In electric vacuum devices, 4J9 alloy is often used to seal with hard glass, which can not only ensure the airtightness of the device, but also improve its stability and reliability.
Chemical Composition: Carbon (C): The amount of carbon in this material is strictly limited to 003% or less, this is to ensure that it has excellent mechanical properties and corrosion resistance. Manganese (mn): The content of manganese is also strictly controlled, not exceeding 050%。The right amount of manganese can improve the strength and toughness of the material. Silicon (Si): The amount of silicon is limited to 030%, which helps to improve the thermal stability and hardness of the material. Phosphorus (P): The phosphorus content is strictly limited to 0020% to prevent brittleness of the material during the welding process. Sulfur (s): The content of sulfur is also strictly controlled and does not exceed 0020% to prevent thermal brittleness of the material during processing. Copper (Cu): The amount of copper is limited to 0Within 20%, the right amount of copper can improve the electrical and thermal conductivity of the material. Chromium (CR): The amount of chromium is limited to 0Within 20%, chromium can improve the corrosion resistance and wear resistance of the material. Molybdenum (Mo): The amount of molybdenum is limited to 0Within 20%, it can improve the thermal stability and corrosion resistance of the material. Nickel (Ni): The nickel content is 285～29.Between 5%, nickel can improve the corrosion resistance and toughness of the material. Cobalt (CO): The content of cobalt is 168～17.Between 8%, cobalt can improve the hardness and thermal stability of the material. Iron (Fe): Iron is the main matrix element, the margin.
Features of 4J6 alloy::
Another important alloy, 4J6, has a coefficient of expansion similar to that of soft glass in the temperature range of 20 to 400. This property makes it ideal for matching seals with the corresponding soft glass. After oxidation treatment, a very dense oxide film is formed on the surface of 4J6 alloy, which has strong binding force with the matrix and good wettability with soft glass. This allows it to provide a high-strength sealing surface, which is an important sealing structure material in the electric vacuum industry. Wide range of applications:
Alloy 4J9 is used in a wide range of applications, and it is used to make iron-nickel-cobalt alloy strips, bars, plates, and tubes that are matched and sealed to hard glass. These products are widely used in a variety of electric vacuum devices, such as transmitters, oscillating tubes, ignition tubes, transistors, as well as tube cap plugs and relay housings. Due to its excellent properties, 4J9 alloy has become an indispensable and important material in the manufacture of electric vacuum devices. Sealing properties with other materials:
In addition to the sealing properties with hard glass, 4J9 alloy can also be sealed with ceramics. This further expands its range of applications, making it a versatile metal material.