Gordon England Surface Engineering Forum



Re: adhesion diffusion impregnation


Posted by Gordon England on May 11, 2004 at 13:33:02:

In Reply to: adhesion diffusion impregnation posted by Karl Easthom on May 06, 2004 at 15:08:02:

: I recently had an argument about whether adhesion of two surfaces, where glass is between two ceramic laminates surface and serves as the adherent upon heating, necessarily requires that some of the glass must diffuse, or impregnate the ceramic surface to an extent, else there will be no binding of the ceramic to the glass. That is, does adhesion necessarily require diffusion or impregnation of the glass into the ceramic ? If so, where do I find the proof ? Thank you very much.

Hi Karl

Some possible mechanisms for bonding:

mechanical interlocking
van der Waals forces
electrostatics
chemical bonding
diffusion

Bonding mechanisms will be dependent on type/chemistry of ceramic and glass, surface preparation and temperature/pressure used in bonding process.

The highest bond strength would be from diffusion bonding followed by chemical bonding etc.. I would suspect you will have diffusion and chemical bonding primarily. But, it is possible to have reasonable bonds from the other mechanisms which are primarily responsible for how organic adhesives and some thermal spray coatings stick.

Have you tested the bond strength? This may give a clue to the predominant bonding mechanism.

Regards Gordon



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