Titanium Gold - Ti3Au

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Titanium Gold - Ti3Au
By Peter Bragdon
Titanium gold is a new alloy that combines one part gold with three parts titanium. It is not just a mixture but a new chemical compound referred to as Ti3Au because of the chemical symbols for titanium (Ti) and gold (Au) in a ratio of three to one (Ti3Au). Titanium can also be mixed with gold in other ratios but the three to one ratio is producing the strongest alloy. Currently it is the strongest metal that it biocompatible.
Ti3Au was discovered in a lab that was experimenting with making “unconventional magnets” by using two non-magnetic elements to make a magnetic compound. The lab was combining titanium and gold in a one to one ratio to produce a magnetic substance. They were experimenting with other ratios of titanium and gold. While trying to grind down the Ti3Au sample, the researchers discovered that it was too hard to grind with their diamond coated mortar and pestle. Professor Emilia Morosan of Rice University in Houston said that the Ti3Au compound “showed the highest hardness of all Ti-Au [titanium-gold] alloys and compounds, but also compared to many other engineering alloys”.
Titanium is often combined with oxygen to form titanium dioxide (TiO2), an additive that gives paint paper and plastic a white color. Titanium is also used for surgical implants. Any metal used in the body has to be biocompatible and resistant to corrosion. This means that the body won’t attack it and it won’t degrade. Current titanium implants are biocompatible but to get replaced every 10 years due to wear and tare.


The new titanium compound, Ti3Au, is not only four times harder than previous titanium compounds but also biocompatible and can attach to ceramics, important for joint replacement. This makes Ti3Au the hardest biocompatible metal. With this new metal there are high chances that it can double the time before replacement. Not only does Ti3Au hold promise for standard medical implant technology, but there is speculation that it could be used to 3D print medical devices.
A cross-section of a titanium dental implant.
Titanium combined in a compound with gold.
Titanium and gold metal implants.





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