Sintered Surface Imperfections

A question we were recently asked by a new customer was why was the incidence of surface imperfections greater following a sintering application as opposed to "standard" vacuum brazing.

This customer wasn't using our product for that specific application but the issue is normally down to the binder used in the braze tape, an often overlooked part of the product.

Invariably during any furnace process binder gas will escape, however because sintering is performed at a lower temperature, the alloy does not have the same opportunity to melt completely and flow together to fill any imperfections in the tape surface. This is where a binder like our Type X that burns off more evenly and allows the gasses to escape in a more controlled manner can help.

We actually make our tapes with 3 different binders.

Our standard binder is designed for all round use and is the most flexible of our binders. It goes into honeycombs easily and can cope with sharp radii.

Our Type 2 binder is designed to go into small cell honeycombs more easily; it has less flexibility of the standard version and produces more of a "snap" when pressed in.

Our Type X binder is the the least flexible of all our binders and burns off more gently and uniformly to leave a smooth surface in almost all applications.

All our binders are designed to burn off cleanly at circa 590C, well below normal operating temperatures, leaving no residue.

No chemical cleaning, scrubbing or grinding is required!

For more information or advice on our variety of binders and other products please don't hesitate to get in touch. Vitta have been bespoking product for our customers for over 50 years!