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A BASIC STUDY OF VACUUM-FUSION ANALYSIS OF REFRACTORY METALS FOR GASES. Final Report

Technical Report ·
OSTI ID:4770271
Various techniques for the determination of oxygen in the refractory metals Nb, Ta, Mo, and W by the vacuumfusion method are evaluated. The platinum bath at 1900 deg C and a Pt: M ratio as low as 1: 1 is satisfactory for niobium and tantalum. An iron bath at 1650 deg C and a maximum molybdenum or tungsten content of 30% is recommended for molybdenum and tungsten. Hydrogen absorption by a Hopcalite-Ascarite mixture was shown. This leads to some error in oxygen analyses made with this absorbent. The use of a gas chromatograph and internal gas standard for analysis of vacuum-fusion gases was demonstrated. Several phase diagrams pertinent to the vacuum-fusion analysis of the 4 metals are given. (auth)
Research Organization:
Battelle Memorial Inst., Columbus, Ohio
NSA Number:
NSA-16-030332
OSTI ID:
4770271
Report Number(s):
WAL-TR-823/5
Country of Publication:
United States
Language:
English

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