The vanadium-oxygen system: phase relations in the vanadium-rich region below 1200 deg C.

Details

• Personal Author:
  Henry, Jack L. ; Krug MP ; McCune RA ; O'Hare SA
• Description:
  Alloy specimens in the high-vanadium region of the vanadium-oxygen system were prepared by the reaction of high-purity vanadium foil and oxygen. The system was studied by x-ray and metallographic examination of quenched specimens, by differential thermal analysis, and by high-temperature x-ray. Solubility was determined as a function of temperature at equilibrium pressure. Equilibrium pressures were not measured. The solubility of oxygen in a-vanadium- -1.1 wt pct at 250 deg. C, 1.3 wt pct at 400 deg. C, 2.8 wt pct at 1,000 deg. C, and 3.5 wt pct at 1,200 deg. C--was found to be higher than previously reported. Retention of the high-temperature structure of a-vanadium by quenching is dependent upon the oxygen content and the quench rate. The a-phase cannot be retained above 2.1 wt pct oxygen even when water quenched from 1,000 deg. C. A peritectoid transformation was found at about 510 deg. C between 2.2 and 4.2 wt pct oxygen. The peritectoid phase, V9O (2.2.), has a composition range at 400 deg. C of 2.9 to 3.9 wt pct oxygen. A martensite structure results from water quenching a-vanadium alloys having oxygen contents from about 2.2 to 3 wt pct. The martensite transforms to the stable v9o upon reheating to temperatures in the range 200 deg.-250 Deg. C. B-vanadium has a composition range at 1,000 deg. C from 4.3 to slightly over 10 wt pct oxygen. [Description provided by NIOSH]
• Subjects:
  Metals Occupational Health Safety Vanadium Compounds
• Keywords:
  Metals; Metallurgical-processes; Metallurgy; Vanadium-compounds
• Series:
  Mining Publications
• ISSN:
  0022-5088
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Oregon ; OSHA Region 10
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  ALRC - Albany Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  115-135
• Volume:
  21
• Issue:
  2
• NIOSHTIC Number:
  nn:10010197
• Citation:
  J Less-Common Met 1970 Jun; 21(2):115-135
• Federal Fiscal Year:
  1970
• Peer Reviewed:
  True
• Source Full Name:
  Journal of the Less-Common Metals
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7dc847c09aedf140bc731323e8446b4703641ae07d6ad9e7b7238120dab30b8f7dcaa9b938d34d035f87873a0fe7fec262d5d13dcaf290925445e82b6de3b57d
• Download URL:
  https://stacks.cdc.gov/view/cdc/246825/cdc_246825_DS1.pdf
• File Type:
  [PDF - 168.02 KB ]