Understanding The Value Of Impregnation In Vacuum Casting

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Understanding The Value Of Impregnation In Vacuum Casting

There has always been a massive problem with porosity when talking about vacuum casting. It remains the inner section of the casting material designed with metal materials. When there is an inner shrinkage in the casting process, you can always experience porosity issues. It causes inclusions, oxide films, gas cultivation, and just to mention a few.


Porosity has become a trendy topic in the field of vacuum casting ever since its creation. Whether the casting process comes from zinc, aluminum, magnesium, iron, bronze, or other materials, the problem of porosity still exists. Due to the structural design, porosity is often available in sintered or powdered metal parts. There are techniques that field experts have used to cover porosity areas during casting. With these methods, there is the production of gases or liquids under pressure to handle the job. 

Impregnation happens to be one of the best methods used in vacuum casting to resolve porosity issues. A sodium silicate or water-glass also remained the first material used for the impregnation of metal casting. Some other materials have been used for impregnation such as pitch gum, linseed oil, tung oil, and more. Immediately after World War Two, there came the development of thermosetting plastics that later remained economical and effective for porosity problems.

Understanding Vacuum Impregnation:

In powdered metal parts and castings, vacuum impregnation remains a sealing method used to cover porosity problems. The liquid sealant that acts as the impregnate will be poured in the space to fill up any porosity space. Once the process is over, you’ll notice that the sealant becomes solidify and later used to cover any opening. The process also involves pressure and vacuum to ensure that the sealing is properly done. The sealing process can also help to improve fishing and plating at the same time.

The Economic Part Of Vacuum Casting Impregnation:

If you’re calculating the value that may be added to the assembly, handling, machining, and other areas, it’s possible to spend a fortune. There will be a clear loss in the process of scrapping a metal part due to leaking and porosity. When considering the costs of impregnation compared to part overruns, re-machining, recasting, and remelting, it’s always a tiny fraction. With impregnation, producers will have the opportunity of saving insured quality, energy, money, and time simply by securing parts that may not be accepted before. Productivity will increase when you get rid of rework and scrap. 

Improving Part Quality Through Vacuum Impregnation:

In the vacuum casting impregnation process, it’s possible to improve the quality of parts. With the help of inspection and testing, people can easily remove parts that have been affected by porosity leakages. With this simple explanation, it’s evident that the quality of parts can be improved by using vacuum casting. 

Micro And Macro Porosity:

When talking about porosity, it’s often divided into two main parts – micro and macro. With the macro-porosity, you’ll get bigger or massive mistakes of parts. The micro-porosity issue is always small and can be corrected almost immediately. 

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