4J33
4J33 is a ceramic sealing alloy developed based on my country’s ceramic characteristics. The alloy has a linear expansion coefficient similar to that of 95% Al2O3 ceramics in the temperature range of -60°C to 600°C. It is mainly used for matching sealing with ceramics and is an important sealing structural material in the electric vacuum industry.
4J33
Product Description:
4J33 is a ceramic sealing alloy developed based on my country’s ceramic characteristics. The alloy has a linear expansion coefficient similar to that of 95% Al2O3 ceramics in the temperature range of -60°C to 600°C. It is mainly used for matching sealing with ceramics and is an important sealing structural material in the electric vacuum industry.
Physical properties:
Melting point: 1450℃
Density: ρ=8.27g/cm3
Thermal conductivity λ=17.6W/(m·℃)
Resistivity: ρ=0.46μΩ·m
Resistance temperature coefficient:
Temperature range/°C | 20～100 | 20～200 | 20～300 | 20～400 | 20～500 |
αR/10-3℃-1 | 4.2 | 4.1 | 3.9 | 3.6 | 3.2 |
Extreme chemical composition:
C | P | S | Mn | Si | Ni | Co | Fe |
≤ | |||||||
0.05 | 0.020 | 0.020 | 0.5 | 0.3 | 32.1-33.6 | 14.0-15.2 | Balance |
Average expansion coefficient:
Sample heat treatment system | average linear expansion coefficient ā/（10-6/℃） | |
20-400℃ | 20-500℃ | |
Heat to 900℃±20℃ in a protective atmosphere or vacuum, keep warm for 1 hour, and cool to below 200℃ at a speed of no more than 5℃/min. | 6.0-6.8 | 6.6-7.4 |
characteristic:
It has a linear thermal expansion coefficient similar to that of 95% AL203 ceramics in the range of -60- +600℃.
Application areas
1. Optical instruments: Due to its low linear thermal expansion coefficient, 4J33 alloy is widely used in optical instruments, such as telescopes, optical lenses, etc. Its dimensional stability ensures the stability and accuracy of optical equipment.
2. High-temperature equipment: 4J33 alloy has good stability in high-temperature environments, so it is used to manufacture high-temperature equipment, such as gas turbines, aerospace engines, etc. Its dimensional stability ensures the reliability and stability of the device in high temperature environments.
3. Electronic devices: Due to its good process-ability and dimensional stability, 4J33 alloy is widely used in manufacturing electronic devices, such as microelectronic packaging, semiconductor manufacturing, etc. Its low coefficient of linear thermal expansion provides excellent package protection and stability.
4. Wire connection: 4J33 alloy can also be used as a wire connection. Due to its low linear thermal expansion coefficient and good dimensional stability, it can ensure the stability and reliability of the connection.
form:
Rod, plate, strip, wire, tube