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

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1968
Accession Number
ADA382087

Entities

People

  • Alan Arias

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Advanced Electronics
  • Space

DTIC Thesaurus Topics

  • Ball Mills
  • Body Weight
  • Chemical Analysis
  • Chromium
  • Diffraction Analysis
  • Hot Pressing
  • Liquids
  • Materials
  • Mechanical Properties
  • Particle Size
  • Powder Metals
  • Pressure Gages
  • Production
  • Solenoid Valves
  • Stainless Steel
  • X Rays
  • X-Ray Diffraction

Readers

  • Powder metallurgy of Titanium alloys.
  • Surface Engineering/Surface Coating Technology.

Technology Areas

  • Space