How Vacuum Impregnation Works:
The Problem :
Inherent to all Metal Casting, (ferrous-nonferrous) Micro Porosity Can led to leak paths Which in time, can lead to leaking parts and ultimate part failure.
The Process :
Customer provides metal casting for processing these parts are placed in batches into a processing basket and than placed into a vacuum pressure vessel where a vacuum is drawn. This process evacuates all air within the microscopic voids within the casting wall, opening fine leak paths making the voids receptive to being filled.
Upon releasing the vacuum, a low-viscosity resin is then introduced filling the internal leak paths. In some processes, pressure is added at the end of the cycle driving the resin deeper into the part. After vacuum impregnation cycle,polymerization of the resin occurs via an anacrobic (in the absence of air ) cure of thermal cure. Since polymerization only occurs in the absence of air, or the introduction of heat, all surface resin will be completely removed via an aqucous wash with original properities and appearance still in tact.
Vaccum Impregnation Process
Dry Vaccum :
The charge basket is lowered into the autoclave. Within the autoclave, the charge basket is subjected to high speed vacuum. Simultaneously the reservoir is subjected to similar vacuum.
Resin Transfer :
The sealant is transferred from the reservoir to the autoclave.
Impregnate / Wet Vacuum :
The vacuum in the autoclave is maintained until the components are throughly impregnated. Then the valves is opened to return the autoclave to atmospheric pressure, further forcing the sealant into the porosity.
The autoclave lid opens and the charge basket is removed and transferred to the next station. A vacuum is generated in the reservoir and the sealant is transferred from the autoclave back into the reservoir.
With the basket hosted over the drain station, the low viscosity sealant drains quickly and is returned to the autoclave. An automatic rotational drain station is available as an option.
The Components are washed by agitation, room temp. water, to remove residual sealant from the component surfaces.
Finally, the process basket is lowered into water maintained at 90 deg. C for 10 minutes allowing the sealant to polymerize. The components are now ready to use.
Vaccum Impregnation Application
- Water & Fuel Pumps,
- Gas & Steam Fitting
- Plastic Moulds, Pneumatics Systems
- Gear Housing
- Gear Boxes
- Fuel System
- Water Meter
- Engines, powdered Metal Parts
- Refrigeration Components
- Truck & Railway Break Parts
- Heat Exchangers
- Aircrafts & Aerospace Parts
- Builders Hardware
- Hydraulic System
- Electrical Housing
- Telecommunication Equipment
- Transmission Housing
- Carbon and graphite components
- Filtration Equipment
- Switch Gear Equipment etc.