How to choose the vacuum pump of the vacuum furnace? Different vacuum pumps need to be selected according to the vacuum level.
一、First, the choice of vacuum degree
1.Vacuum (4X10-1P a) adopts two-stage pump (backing pump and roots pump) for low vacuum treatment, such as vacuum heat treatment of bearing steel, mold steel, structural steel, etc.
2. For some products that require high vacuum, you can choose three-stage pumps (front pumps, roots pumps, diffusion pumps, etc.) generally require a vacuum degree of 10-4Pa. Such as (vacuum heat treatment or high temperature brazing of high temperature alloys, titanium alloys, magnetic materials, etc.).
3. Graphite reflective screenGenerally, there are two kinds of hard felt and soft felt used in vacuum furnaces, which are suitable for quenching, tempering and annealing of general steel. High temperature brazing, powder metallurgy and sintering, etc.
二、Second, what metal heat insulation screens are generally used in vacuum furnaces?
1.Generally, the metal screens used in vacuum furnaces are stainless steel and molybdenum, tantalum, tungsten.
2.Molybdenum reflective screen is suitable for quenching and annealing materials with high temperature and high requirements for the environment in the furnace (such as: high-temperature alloy, titanium alloy, magnetic materials, etc.).
3.Stainless steel rice shooting screen is suitable for tempering, low-temperature annealing, aging, vacuum aluminum brazing, etc., and some low-temperature vacuum furnace furnace type selection.
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