Porosity in Powdered Metal Components

Cast components are impregnated to seal them against leaks. Powdered metal parts are impregnated to improve their material properties:

Improved Machining Properties
Powder Metal components are notorious for their aggressive effect on cutting tools. Impregnation prior to machining effectively creates a more homogeneous surface that reduces potential for tool ‘chatter’. This can extend tool life by up to one hundred times

Surface Coating Pre-Treatment
The significant porosity in powder metal parts can harbour contaminates such as oil, acids or cleaning agents, from production processes. If left untreated, this can lead to subsequent surface treatments being damaged when the contaminants leach out to the surface. Impregnation effectively cleans and fills this porosity allowing a better quality surface treatment ensuring increased life expectancy

Pressure Integrity

In applications where powder metal parts are used for pressure critical components, impregnation ensures that the inherent porosity within the part is fully sealed – ensuring it is fit for purpose.

What is vacuum impregnation?

Vacuum impregnation is a process that uses a chemically and thermally resistant acrylic sealant and specialist application equipment to fill and seal the voids and micro-porosity in a wide variety of materials including metal castings, electronic and powder metal components.

Using Ultraseal impregnation sealants and process equipment provides:

  • Outstanding void filling capacity due to low shrinkage during polymerisation
  • Optimised viscosity and capillary action for fast deep penetration of micro porosity
  • Tough and flexible attributes to provide resistance to chemical, temperature and vibration
  • Excellent adhesion to cavity walls ensuring a permanent seal
  • Stability at operating temperatures between -50°C and +220°C (-58°F and +428°F)

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