Physical chemistry of the powder metallurgy of beryllium: Chemical characterization of the powder in relation to its granularity
Creators
- 1. Univ. of Burgundy, Dijon (France). Lab. for the Reactivity of Solids
- 2. CEA, Valduc (France). Atomic Energy Board
Description
Combining the systematic quantitative chemical analysis of the light impurities H, C, N, and O, the quantitative thermal desorption of molecular H2O and H2, and X-ray diffractometry of various size fractions of a commercial Be powder (SP-65 grade from Brush-Wellman) allowed the precise determination of the mean composition and equivalent mean thickness of the surface impurity phases in the passivation-contamination layer on the surface of the particles. The overall surface stoichiometry is as follows: 0.2 BeOcrystallized, 0.8 [BeO - 0.59 H2O]amorphous, 0.14 H2Oads. The result of the elemental analysis by X-ray photoelectron spectroscopy of the unetched surface of a powder pellet is compared. Analysis of the metallic impurities reveals increased concentrations of Mg, Ca, Ti, and Cr in the finest fraction, presumably due to the liberation of fine particles of intermetallic phases by attrition
Additional details
Publishing Information
- Journal Title
- Metallurgical Transactions. A, Physical Metallurgy and Materials Science
- Journal Volume
- 27
- Journal Issue
- 2
- Journal Page Range
- p. 371-380.
- ISSN
- 0360-2133
- CODEN
- MTTABN
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 27040350
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE;
- Descriptors DEI
- BERYLLIUM; DESORPTION; HYDROGEN; IMPURITIES; PARTICLE SIZE; PHOTOELECTRON SPECTROSCOPY; PHYSICAL PROPERTIES; POWDERS; QUANTITATIVE CHEMICAL ANALYSIS; SCANNING ELECTRON MICROSCOPY; STOICHIOMETRY; SURFACES; WATER; X-RAY DIFFRACTION
- Descriptors DEC
- ALKALINE EARTH METALS; CHEMICAL ANALYSIS; COHERENT SCATTERING; DIFFRACTION; ELECTRON MICROSCOPY; ELECTRON SPECTROSCOPY; ELEMENTS; HYDROGEN COMPOUNDS; METALS; MICROSCOPY; NONMETALS; OXYGEN COMPOUNDS; SCATTERING; SIZE; SPECTROSCOPY