Enhances Base Metal Surfaces to Improve Brazing Filler Metal Flow and Wettability Through Tight Joints
NicroBlast™ Grit is a specially formulated nickel-chromium-iron blasting grit that enhances brazing action by creating more suitable surfaces on the base metals being joined. The grit blasting operation provides the base metal with a texture and compressive surface stress which improves and promotes multi-directional flow of the Brazing Filler Metal. This is particularly effective with nickel- based filler metals resulting in increased joint fill. The result is increased joint fill.
Since its composition resembles a nickel-chromium-iron Brazing Filler Metal, NicroBlast™ Grit works on a variety of base metals, including stainless steels, nickel-based and precious metals, and even difficult-to-work superalloys such as titanium.
|Forms||Mesh Size||Manufactured In|
|Iron-Based||60 mesh – 230 mesh (250 – 63 microns)||USA|
|Nickel-Based||60 mesh – 170 mesh (250 – 90 microns) or 140 mesh – 400 mesh (106 – 38 microns)||UK|
Stainless Steel Grit
NicroBlast™ Grit is harder than stainless steel grit, and its high nickel and chromium composition is closer to the nickel-based Brazing Filler Metals most commonly used in brazing corrosion-resistant base metals.
Cast Iron or Steel Grit
Cast iron or steel traces left after blasting will rust and contaminate base metal surfaces. Angular grit is too aggressive and will result in excess metal removal. Spherical grit geometry will produce the desired compressive stress in the base metal surface.
Non-Metallic Compounds (sand, glass beads, aluminum oxide, zirconia, silica)
Non-metallic media leave behind embedded particles of silicon, aluminum or zirconium oxides. These embedded particles will adversely affect braze joint strength by preventing the Brazing Filler Metal from properly wetting and flowing on base metal surfaces.