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Achieving ultralow wear with stable nanocrystalline metals • Wiley Online Library
John F. Curry:
<p>
Recent work suggests that thermally stable nanocrystallinity in metals is achievable in several binary alloys by modifying grain boundary energies via solute segregation. The remarkable thermal stability of these alloys has been demonstrated in recent reports, with many alloys exhibiting negligible grain growth during prolonged exposure to near‐melting temperatures. Pt–Au, a proposed stable alloy consisting of two noble metals, is shown to exhibit extraordinary resistance to wear. Ultralow wear rates, less than a monolayer of material removed per sliding pass, are measured for Pt–Au thin films at a maximum Hertz contact stress of up to 1.1 GPa. This is the first instance of an all‐metallic material exhibiting a specific wear rate on the order of 10−9 mm3 N−1 m−1, comparable to diamond‐like carbon (DLC) and sapphire. Remarkably, the wear rate of sapphire and silicon nitride probes used in wear experiments are either higher or comparable to that of the Pt–Au alloy, despite the substantially higher hardness of the ceramic probe materials.</p>

Translated: they made a platinum-gold alloy that is as hard, or harder, than diamond or sapphire, and you know how hard those mfs are. (The whole thing is available to read free.)
Diamond  alloy  gold  platinum 
12 weeks ago by charlesarthur
In situ tribochemical formation of self-lubricating diamond-like carbon films - ScienceDirect
So rubbing palladium-gold alloys in teh presence of carbon containing stuff makes very slippery diamond-like carbon films without an expensive plasma furnace, and might be suitable for mass production use
palladium  gold  nanoparticle  amorphous  diamond  carbon  film  nanocomposite  lubricant  materials  science  research  technology  tribochemical  production  process 
august 2018 by asteroza

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