Pre-sintered Preforms Reduce Distortion

The Wesgo Metals Division of Morgan Advanced Ceramics (MAC) is now offering aeroengine manufacturers its pre-sintered preforms (PSP) for high-temperature braze repair applications. These multi-component systems are designed for both dimensional restorations and crack repairs, making them ideal for use in aeroengines. Unlike traditional brazing pastes and green tapes, the porosity of PSP is less than 5-percent, which helps to eliminate shrinkage. PSP's are easy to handle and environmentally safe, providing a cost-effective braze repair solution.

Brazed parts require minimal grinding to restore components to original dimensions. To further decrease milling on graded geometries, Wesgo Metals' PSPs can be manufactured in tapered preforms. Additionally, brazing allows whole components to be heated in a vacuum furnace, reducing distortions and providing increased consistency, resulting in a high-quality repair process.

For customized applications, Wesgo Metals offers PSPs in various shapes, including curved, tapered and cylindrical, with thickness ranging from 0.010" (0.3mm) to 0.200" (5mm) Unlike flat preforms, curved PSPs reduce processing time by eliminating the need for a second braze cycle on both convex and concave surfaces. For dimensionally restoring holes and bores, cylindrical preforms are ideal, because they will not sag or over flow during brazing. In addition, the braze-repair process using PSP is now being investigated for component repairs of gas turbines.

SOURCE: Morgan Advanced Ceramics