02-25-2021, 08:33 AM
Key points of vacuum carbonization furnace cavity processing
In vacuum carbonization furnace, in order to reduce the surface area of cavity inner wall, sandblasting or electropolishing is usually used to obtain a smooth surface. The cavity of ultra-high vacuum system in vacuum furnace is treated by electropolishing.
In principle, it is necessary to select internal welding for argon arc welding of ultra-high vacuum chamber, that is, the welding surface is on the side of vacuum, so as to avoid dead corner and false leakage. Two layer welding and two layer sealing are not allowed in vacuum chamber of vacuum carbonization furnace.
A lot of gas molecules or other organics are adsorbed on the surface of the inner wall of the vacuum chamber, which becomes the exhaust gas source affecting the vacuum degree. In order to achieve ultra-high vacuum, it is necessary to bake the chamber at 150 ~ 250 ℃ in order to release the gas inside and outside the material as soon as possible. The baking methods include wrapping the heating belt around the outer wall of the chamber, fixing the armored heating wire on the outer wall of the chamber or directly placing the chamber in the baking tent. The more economical and simple baking method is to use the heating belt. The outside of the heating belt is wrapped with aluminum foil to avoid heat loss and make the cavity heated evenly.
Stainless steel is the main structural material of ultra-high vacuum system. Among them, 300 series stainless steel (Table 1) is a low carbon steel containing 10% ~ 20% Cr, which has excellent corrosion resistance, low outgassing rate, non-magnetic, good weldability, low conductivity and thermal conductivity, and can work at - 270 ~ 900 ℃. It is widely used in high vacuum and ultra-high vacuum systems.
Vacuum Carburizing Furnace
Vacuum Sintering Furnace
industrial vacuum pumps,vacuum furnaces
In vacuum carbonization furnace, in order to reduce the surface area of cavity inner wall, sandblasting or electropolishing is usually used to obtain a smooth surface. The cavity of ultra-high vacuum system in vacuum furnace is treated by electropolishing.
In principle, it is necessary to select internal welding for argon arc welding of ultra-high vacuum chamber, that is, the welding surface is on the side of vacuum, so as to avoid dead corner and false leakage. Two layer welding and two layer sealing are not allowed in vacuum chamber of vacuum carbonization furnace.
A lot of gas molecules or other organics are adsorbed on the surface of the inner wall of the vacuum chamber, which becomes the exhaust gas source affecting the vacuum degree. In order to achieve ultra-high vacuum, it is necessary to bake the chamber at 150 ~ 250 ℃ in order to release the gas inside and outside the material as soon as possible. The baking methods include wrapping the heating belt around the outer wall of the chamber, fixing the armored heating wire on the outer wall of the chamber or directly placing the chamber in the baking tent. The more economical and simple baking method is to use the heating belt. The outside of the heating belt is wrapped with aluminum foil to avoid heat loss and make the cavity heated evenly.
Stainless steel is the main structural material of ultra-high vacuum system. Among them, 300 series stainless steel (Table 1) is a low carbon steel containing 10% ~ 20% Cr, which has excellent corrosion resistance, low outgassing rate, non-magnetic, good weldability, low conductivity and thermal conductivity, and can work at - 270 ~ 900 ℃. It is widely used in high vacuum and ultra-high vacuum systems.
Vacuum Carburizing Furnace
Vacuum Sintering Furnace
industrial vacuum pumps,vacuum furnaces
