Braze product including additive particles and methods of brazing

A wire, rod, sheet or preform for brazing, said wire, rod, sheet, or preform comprising:

• a braze filler metal formed into a body of the wire, rod, sheet, or preform and having a channel, cavity, core, or coating, said braze filler metal having a first melting temperature;
• brazing flux disposed in the channel, cavity, core, or coating, said brazing flux having a second melting temperature;
• and
• additive particles comprising metal particles evenly distributed in the brazing flux, said metal particles having a particle size between 1 and 200 microns,
• wherein the metal particles are present in a proportion of between .5% and 8% of the braze filler metal by weight, said metal particles released from the channel, cavity, core, or coating when the brazing flux is melted at the second melting temperature and said metal particles are soluble in the braze filler metal when the braze filler metal has melted at said first melting temperature, and at least some of said metal particles having a size greater than 20 microns remain partially undissolved after a brazing operation.