Report of Investigations 7437: Phase Relations in the Alkaline Earth Fluoride-Yttria Systems (In Three Parts): 1. The CaF2-Y2O3 Phase Diagram

Details

• Personal Author:
  Babitzke, Herbert R. ; Oden, Laurance L. ; Sanker, Philip E. ; Sumner, Donald H.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  The Bureau of Mines is developing melting data for binary combinations of the alkaline earth fluorides and yttria to facilitate the formulation of slag compositions. The present report deals with the caf2-y2o3 system for which solidus and liquidus temperatures and solid solubilities were determined. The information is presented as the phase diagram. All specimen compositions were blended from high-purity materials and encapsulated in mo or pt20rh prior to heat treatment. Liquidus temperatures were determined by ceramographic examination of heat- treated and quenched specimens. Solidus temperatures were determined by differential thermal analysis and by electron microprobe analysis of quenched specimens. Terminal solid solubilities were derived by parametric methods. The peritectic system was found to be pseudobinary due to the formation of yttrium oxyfluoride at temperatures near the liquidus. The peritectic point occurs at 7 mole percent y2o3 and 1,438 deg. +-5 Deg. C. The terminal solid solubility of y2o3 in caf2 decreases from 7 mole percent at 1,438 deg. C to 1 mole percent at 1,100 deg. C, and the solubility of caf2 in y2o3 decreases from 9.5 to 7 mole percent over the same temperature interval. [Description provided by NIOSH]
• Subjects:
  Chemistry Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• ISSN:
  1066-5552 (print)
• Publisher:
  United States. Bureau of Mines
• Document Type:
  Text
• Genre:
  Case Report
• Rights:
  Public Domain
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  ALRC - Albany Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  16 pdf pages
• NIOSHTIC Number:
  nn:10009181
• NTIS Accession Number:
  PB-196685
• Citation:
  NTIS: PB 196 685 :1-10
• Federal Fiscal Year:
  1970
• Peer Reviewed:
  False
• Source Full Name:
  NTIS: PB 196 685
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:ec002d4eacf1142af90960724258fdfaa2c69e469078a3fdb4532cee8c03a3fd30596457d6eac11e303d049991c909fb9d5a7532af6fb102e20d4fb6a152edee
• Download URL:
  https://stacks.cdc.gov/view/cdc/201969/cdc_201969_DS1.pdf
• File Type:
  [PDF - 1.11 MB ]