Liquid Solid Diffusion (LSD) bonding: A novel joining technology

Liquid Solid Diffusion (LSD) bonding is a novel joining technology forming solid and liquid two-phase field joints from simple binary systems. LSD creates joints that are applicable at temperatures above the melting temperature of the material composition of the initial bond. Liquid and solid inter-diffusion transform the joint composition and microstructure. The final joint is characterized by incongruent re-melting forming a coherent continuous porous solid solution phase with liquefied pores. This article briefly describes the methodology and presents experimental results based on the Au-Ge system. High quality joints were created. The effective melting point was increased by more than 200 °C above the initial eutectic melting point of the system.