Active Metal Brazing Ceramic

Our active brazing filler metals enable direct bonding of two ceramics or ceramics to metals regardless of whether they are oxides or nitrides without metallization.

Active metal brazing ceramic.

The thermal expansion coefficients of ceramics are generally much lower than metals. Active metal brazing is a joining method where ceramics can be joined to metals or itself through a brazing alloy known as active brazing alloy aba under the application of heat and pressure. In active metal brazing a metal usually titanium is added to the braze alloy to promote reaction and wetting with a ceramic substrate. Active metal brazing is used mainly for joining ceramics that are not wetted by conventional brazes.

Active brazetm no 10 brazing paste grade b420p 80 provides a silver copper titanium type active brazing filler metal in paste form and is intended principally for brazing non metallised alumina ceramics to a metallic substrate. Surface treatments include metallisation metal coating and metal hydride treatment while braze modification involves a process known as active metal brazing. To encourage wetting there are two basic philosophies apply something to the surface of the ceramics so that the braze will wet or put something in the braze that will induce wetting. Depending on joint geometry active metal bonds should not necessarily be considered as strong as moly manganese bonds and may require empirical testing.

Active metal braze alloys eliminate process steps allowing you to braze directly to raw ceramics with prior heal firing without having to metalize plate the surface prior to brazing. Therefore the type and concentration of the added active element in the brazing alloy are crucial to the joint strength. One step brazing with aba replaces metallising firing and electroplating offering savings in time and cost. Active brazing filler metals our active brazing filler metals enable direct ceramic brazing.

For active metal brazing the metallurgical bonding is the result of a chemical reaction between the reactive element in the brazing alloy and the ceramic surfaces.