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- Gold-aluminium_intermetallic abstract "A gold-aluminium intermetallic is an intermetallic compound of gold and aluminium that occurs at contacts between the two metals. These intermetallics have different properties than the individual metals which can cause problems in wire bonding in microelectronics. The main compounds formed are Au5Al2 (white plague) and AuAl2 (purple plague), which both form at high temperatures. White plague is the name of the compound Au5Al2 as well as the problem it causes. It has low electric conductivity, so its formation at the joint leads to an increase of electrical resistance which can lead to total failure. Purple plague (sometimes known as 'purple death' or Roberts-Austen's 'purple gold') is a brittle, bright-purple compound, AuAl2, or about 79%Au-21%Al by mass. AuAl2 is the most stable thermally of the Au-Al intermetallic compounds, with a melting point of 1060°C (see phase diagram), similar to that of pure gold. The process of the growth of the intermetallic layers causes reduction in volume, and hence creates cavities in the metal near the interface between gold and aluminium.Other gold-aluminium intermetallics can cause problems as well. Below 624°C, purple plague is replaced by Au2Al, a tan-colored substance. It is a poor conductor and can cause electric failure of the joint that can lead to mechanical failure. At lower temperatures, about 400–450°C, an interdiffusion process takes place at the junction. This leads to formation of layers of several intermetallic compounds with different compositions, from gold-rich to aluminium-rich, with different growth rates. Cavities form as the denser, faster-growing layers consume the slower-growing ones. This process, known as Kirkendall voiding, leads to both increased electrical resistance and mechanical weakening of the wire bond. When the voids are collected along the diffusion front, a process aided by contaminants present in the lattice, it is known as Horsting voiding, a process similar to and often confused with Kirkendall voiding.All problems caused by gold-aluminium intermetallics can be prevented either by using bonding processes that avoid high temperatures (e.g. ultrasonic welding), or by designing circuitry in such a way as to avoid aluminium-to-gold contact using aluminium-to-aluminium or gold-to-gold junctions.".
- Gold-aluminium_intermetallic thumbnail Gold-aluminium_intermetallic.svg?width=300.
- Gold-aluminium_intermetallic wikiPageExternalLink nph-data_query?bibcode=1997ESASP.395..411J&link_type=ARTICLE&db_key=AST&high=.
- Gold-aluminium_intermetallic wikiPageID "8699846".
- Gold-aluminium_intermetallic wikiPageRevisionID "606024843".
- Gold-aluminium_intermetallic hasPhotoCollection Gold-aluminium_intermetallic.
- Gold-aluminium_intermetallic subject Category:Aluminium_compounds.
- Gold-aluminium_intermetallic subject Category:Corrosion.
- Gold-aluminium_intermetallic subject Category:Gold.
- Gold-aluminium_intermetallic subject Category:Integrated_circuits.
- Gold-aluminium_intermetallic subject Category:Intermetallics.
- Gold-aluminium_intermetallic type Artifact100021939.
- Gold-aluminium_intermetallic type Circuit103033362.
- Gold-aluminium_intermetallic type ComputerCircuit103084420.
- Gold-aluminium_intermetallic type Device103183080.
- Gold-aluminium_intermetallic type ElectricalDevice103269401.
- Gold-aluminium_intermetallic type Instrumentality103575240.
- Gold-aluminium_intermetallic type IntegratedCircuit103577090.
- Gold-aluminium_intermetallic type IntegratedCircuits.
- Gold-aluminium_intermetallic type Object100002684.
- Gold-aluminium_intermetallic type PhysicalEntity100001930.
- Gold-aluminium_intermetallic type Whole100003553.
- Gold-aluminium_intermetallic comment "A gold-aluminium intermetallic is an intermetallic compound of gold and aluminium that occurs at contacts between the two metals. These intermetallics have different properties than the individual metals which can cause problems in wire bonding in microelectronics. The main compounds formed are Au5Al2 (white plague) and AuAl2 (purple plague), which both form at high temperatures. White plague is the name of the compound Au5Al2 as well as the problem it causes.".
- Gold-aluminium_intermetallic label "Gold-aluminium intermetallic".
- Gold-aluminium_intermetallic label "Purpurpest".
- Gold-aluminium_intermetallic sameAs Purpurpest.
- Gold-aluminium_intermetallic sameAs m.027ffdc.
- Gold-aluminium_intermetallic sameAs Q2118955.
- Gold-aluminium_intermetallic sameAs Q2118955.
- Gold-aluminium_intermetallic sameAs Gold-aluminium_intermetallic.
- Gold-aluminium_intermetallic wasDerivedFrom Gold-aluminium_intermetallic?oldid=606024843.
- Gold-aluminium_intermetallic depiction Gold-aluminium_intermetallic.svg.
- Gold-aluminium_intermetallic isPrimaryTopicOf Gold-aluminium_intermetallic.
