Feasibility of Producing Dispersion Strengthened Chromium by Ball-milling in Hydrogen Halides

Download or read book Feasibility of Producing Dispersion Strengthened Chromium by Ball-milling in Hydrogen Halides written by Alan Arias and published by . This book was released on 1968 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chromium, with and without 4 volume percent thoria, and nickel powders were ground to fine powder sizes by ball-milling in gaseous hydrogen halides. After reducing the milled chromium in flowing hydrogen under pulsating pressure at about 680 deg C submicron-size powders with 4 to 500 ppm residual halogens were obtained. The compacted chromium-thoria alloys had interparticle spacings ranging from 2. 1 to 6. 5 micrometers. After 100 hours at 1318 deg C the interparticle spacing of the 2. 1-micrometer alloy increased to 5.2 micrometers. Submicron-size chromium and nickel powders were also obtained by pulsating hydrogen reduction of their chlorides.