A system includes a chamber, a nonconsumable cathode shielded against chemical reaction by a working gas not including an oxidizing gas, but including an inert gas, a consumable anode vaporizable by an arc formed between the cathode and the...http://www.google.com.au/patents/US5874684?utm_source=gb-gplus-sharePatent US5874684 - Nanocrystalline materialsAdvanced Patent SearchPublication numberUS587