Vacuum Pump And Production Method Thereof

Abstract: The invention relates to a method for producing a vacuum pump stator part obtained by casting cast iron or steel, the vacuum pump comprising a stator (2) and two rotors (3) accommodated in at least one pumping chamber of the stator (2), the rotors (3) being configured to rotate in the pumping chamber in order to drive a gas to be pumped between a suction port (4) and a discharge port (5) of the vacuum pump, the stator part being made in a mould that accommodates at least one sand core (15, 16) comprising a majority of sand selected from one or more of the following sands: - artificial globular ceramic sand; - chromite sand; - bauxite sand; - zircon sand; - kerphalite sand; - olivine sand, wherein the surfaces of the stator part (2) produced by casting that are to be exposed to the pumped gases are coated with a coating based on nickel alloy, such as a nickel-phosphorus coating.

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