Armstrong process
The Armstrong process is used to refine titanium. Its output is particle-sized dust which can be sprayed into pattern-molds.[1][2][3] It was patented in 1999.[4] The output of this process has a "coral-like morphology", which differs from the traditional outputs like "spherical gas-atomized powder, mechanically crushed angular particles, or the titanium sponge morphology created during the Kroll process."[3]
History
The Armstrong process was patented in 1999.[4]
In 2016 a paper by MacDonald et al. told that the Armstrong powder was produced directly from the reduction of Titanium tetrachloride "in a continuous liquid loop", and cost only "11-24 USD/kg",[3] or roughly an order of magnitude higher than the price of steel.[5]
Description
The reducing agent for the Armstrong process is sodium, which is liquefied and introduced in a combined stream with titanium tetrachloride.[4]
References
- ↑ Template:Cite book
- ↑ W.H.P. Bill, C.A. Blue, J.O. Kiggans, and J.D.K. Rivard, Powder Metallurgy and Solid State Processing of Armstrong Titanium and Titanium Alloy Powders, ITA Annual Conference 2007
- ↑ 3.0 3.1 3.2 Template:Cite journal
- ↑ 4.0 4.1 4.2 Template:US patent
- ↑ Template:Cite web