Porosity of Thermal Spray

This is present in most therma spray coatings(except VPS, post heat treated coatings or fused coatings). 1 to 25% porosity is normal but can be further manipulated by changes in process and materials.

Porosity can be detrimental in coatings with respect to:

• Corrosion – (sealing of coatings advised).
• Machined finish.
• Strength, macrohardness and wear characteristics.

Porosity can be important with respect to:

• Lubrication – porosity acts as reservoir for lubricants.
• Increasing thermal spray barrier properties.
• Reducing stress levels and increasing thickness limitations.
• Increasing shock resisting properties.
• Abradability in clearance control coatings.
• Applications in prosthetic devices and nucleate boiling etc..

Surface Technology Co.,Ltd. We are one of the leading Thermal spray onsite and shop spray in the Thailand.

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