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Corrosion of beryllium oxide; Corrosion de l'oxyde de beryllium

Abstract

Data are reported on the volatilization rate of beryllium oxide in moist air depending on temperature and water vapour concentration. They are concerned with powder samples or sintered shapes of various densities. For sintered samples, the volatilization rate is very low under the following conditions: - temperature: 1300 deg. C, - water vapour concentration in moist air: 25 g/m{sup 3}, - flow rate: 12 I/hour corresponding to a speed of 40 m/hour on the surface of the sample. For calcinated powders (1300 deg. C), grain growth has been observed under a stream of moist air at 1100 deg. C. For instance, grain size changes from 0,5 to at least 2 microns after 500 hours of exposure at this temperature. Furthermore, results data are reported on corrosion of sintered beryllium oxide in pressurized water. At 250 deg. C, under a pressure of 40 kg/cm{sup 2} water is very slightly corrosive; however, internal strains are revealed. Finally, some features on the corrosion in liquid sodium are exposed. (author)Fren. [French] La volatilisation de l'oxyde de beryllium dans l'air humide est etudiee en fonction de la temperature pour differentes teneurs de vapeur d'eau. Les essais decrits portent sur de l'oxyde de beryllium en poudre  More>>
Authors:
Elston, J; Caillat, R [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Jul 01, 1958
Product Type:
Technical Report
Report Number:
CEA-R-984
Resource Relation:
Other Information: 17 refs
Subject:
36 MATERIALS SCIENCE; ACCURACY; BERYLLIUM OXIDES; BULK DENSITY; CORROSION; EVAPORATION; FLOW RATE; GRAIN GROWTH; HEAT TREATMENTS; HUMIDITY; LIQUID METALS; PHOTOMICROGRAPHY; POROSITY; POWDERS; PWR TYPE REACTORS; SINTERED MATERIALS; SODIUM COOLED REACTORS; SPECIFIC SURFACE AREA; TEMPERATURE DEPENDENCE; VAPOR PRESSURE; WATER VAPOR; WEIGHT
OSTI ID:
20901033
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR07R0984063256
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
56 pages
Announcement Date:
Aug 28, 2007

Citation Formats

Elston, J, and Caillat, R. Corrosion of beryllium oxide; Corrosion de l'oxyde de beryllium. France: N. p., 1958. Web.
Elston, J, & Caillat, R. Corrosion of beryllium oxide; Corrosion de l'oxyde de beryllium. France.
Elston, J, and Caillat, R. 1958. "Corrosion of beryllium oxide; Corrosion de l'oxyde de beryllium." France.
@misc{etde_20901033,
title = {Corrosion of beryllium oxide; Corrosion de l'oxyde de beryllium}
author = {Elston, J, and Caillat, R}
abstractNote = {Data are reported on the volatilization rate of beryllium oxide in moist air depending on temperature and water vapour concentration. They are concerned with powder samples or sintered shapes of various densities. For sintered samples, the volatilization rate is very low under the following conditions: - temperature: 1300 deg. C, - water vapour concentration in moist air: 25 g/m{sup 3}, - flow rate: 12 I/hour corresponding to a speed of 40 m/hour on the surface of the sample. For calcinated powders (1300 deg. C), grain growth has been observed under a stream of moist air at 1100 deg. C. For instance, grain size changes from 0,5 to at least 2 microns after 500 hours of exposure at this temperature. Furthermore, results data are reported on corrosion of sintered beryllium oxide in pressurized water. At 250 deg. C, under a pressure of 40 kg/cm{sup 2} water is very slightly corrosive; however, internal strains are revealed. Finally, some features on the corrosion in liquid sodium are exposed. (author)Fren. [French] La volatilisation de l'oxyde de beryllium dans l'air humide est etudiee en fonction de la temperature pour differentes teneurs de vapeur d'eau. Les essais decrits portent sur de l'oxyde de beryllium en poudre ou sur des echantillons d'oxyde de beryllium fritte de differentes densites. Avec un debit d'air de 12 I/h contenant 25 g de vapeur par m{sup 3} correspondant a une vitesse de 40 m/h sur la surface de l'echantillon, la volatilisation des frittes a 1300 deg. C reste tres faible. Sur de la poudre d'oxyde de beryllium calcinee initialement a 1300 deg. C, on observe un grossissement de la taille des grains sous l'influence de l'air humide a 1100 deg. C. Par exemple, elle passe de 0,5 a au moins 2 microns apres 500 heures d'exposition a cette temperature. On donne d'autre part les resultats d'une etude de la corrosion de frittes d'oxyde de beryllium par l'eau, en autoclave. A 250 deg. C, sous une pression de 40 kg/cm{sup 2}, l'action de l'eau reste tres faible; cependant, elle met en ence les tensions internes de la brique. Enfin, quelques aspects de la corrosion de l'oxyde de beryllium fritte par le sodium sont presentes. (auteur)}
place = {France}
year = {1958}
month = {Jul}
}