Diffusion Pump Oil
for Vacuum Metalizing
This oil is used to create a vacuum in the chamber where the metallization process takes place. It's typically a high-boiling-point, low-vapor-pressure oil thatwon't react with the metals being deposited
Goldshine Enterprise provide you diffusion pump oil for vacuum metalizing.The choice of fluid affects the pump’s performance and ultimate vacuum level.
Diffusion pump oil achieves higher vacuum levels. It can produce pressures approaching when used with modern fluids and accessories.
Diffusion pump oil are commonly used in industrial applications for vacuum metalizing and their operation relies on vaporized oil and the fascinating principles of diffusion
A diffusion pump is a type of high-vacuum pump that operates in the regime of free molecular flow. Let me explain how it works:
Principle of Operation:
Diffusion pumps use a high-speed jet of vapor to direct gas molecules in the pump throat down into the bottom of the pump and out the exhaust.
The principle behind diffusion pumps is based on the finding that gas cannot diffuse against the vapor stream but will be carried with it to the exhaust.
In modern textbooks, the diffusion pump is categorized as a momentum transfer pump.
Oil Diffusion Pumps:
An oil diffusion pump is commonly used to achieve higher vacuum levels than what positive displacement pumps alone can achieve.
The pump unit consists of a cylindrical chamber with a heatable bottom.
Oil serves as the working fluid, and it is heated up.
The vapor from the heated oil rises into a nozzle system.
Within the nozzles, the flow changes from laminar to supersonic and molecular.
The high-speed jet generated by the oil vapor directs gas molecules downward and out of the pump’s exhaust. Note that the oil is gaseous when entering the nozzles1.
Advantages of Diffusion Pumps:
High pumping speed for all gases.
Low cost per unit pumping speed compared to other vacuum pumps in the same range.
Diffusion pumps are widely used in both industrial and research applications.
Operating Pressure:
Diffusion pumps cannot discharge directly into the atmosphere.
Typically, a mechanical forepump (such as a rotary vane pump) is used to maintain an outlet pressure around 0.1 mbar (10 Pa).
So, in summary, oil diffusion pumps play a crucial role in achieving high and ultra-high vacuum levels by efficiently directing gas molecules downward using a vapor jet generated from heated oil. If you have any more questions or need further clarification, contact us for more details.
