Melt quality involves control of two basic impurities common to most aluminum melting/casting processes--hydrogen content and non-metallic or intermetallic
Under high magnification, the intermetallic
layer can be verified to show proper formation and measure the thickness of the intermetallic
between the BGA sphere and PCB pad.
Vladimir Trzebiatowskie Polish Academy of Sciences brand new, complete system that allows obtaining epitaxial thin films of metals, intermetallic
, and oxide systems using laser ablation.
Study of Intermetallic
Growth and Kinetics in Fine-Pitch Lead-Free Solder Bumps for Next-Generation Flip-Chip Assemblies"
Other advanced intermetallic
materials described include aluminides of iron, nickel, and cobalt.
SAC 305 joints are dull and grainy, with the surface showing a microstructure of coarse intermetallic
However, the combination of aluminium and steel is difficult to weld due to possible formation of intermetallic
compounds between aluminium and iron which are hard and brittle.
It is related to the development of industrial processes, which can successfully produce useful components from these intermetallic
materials," said Browne.
All of which could be an indicator that an intermetallic
compound was growing, and the joint was losing its strength as a result, suggests Jim Raby.
Contract notice: Purchase and installation of a molecular beam epitaxy system and a system for in-situ spectroscopy, band mapping and analysis of thin intermetallic