Investigation of high-temperature oxidation of lanthanum hexaboride in oxygen and the effect of internal oxidation on the protective properties of the scale

Journal Article · Mon Oct 01 00:00:00 EDT 1973 · Oxidation Metals, v. 7, no. 2, pp. 131-139

DOI:https://doi.org/10.1007/BF00611452· OSTI ID:4411748

Lavrenko, V A; Glebov, L A; Lugovskaya, Y S; Frantsevich, I N

The vacuum microbalance method as well as petrographic and x-ray phase analysis were employed to investigate the oxidation of lanthanum hexaboride as a function of temperature (700 to 1200 deg C). oxygen pressure (0.1 to 740 torr), and porosity of the sample. It was established that LaB/sub 6/ is highly resistant to oxidation in oxygen up to a temperature of 1200 deg C. The protective properties of the scale are determined by the peculiarities of the process of internal oxidation, during which a lower lanthanum boride, Lab/sub 4/, was observed to be enveloped by the vitreous oxide phase, B/sub 2/O/sub 3/. (auth)

• Research Organization: Materials Research Inst., Kiev
• Sponsoring Organization: USDOE
• NSA Number: NSA-29-008202
• OSTI ID: 4411748
• Journal Information: Oxidation Metals, v. 7, no. 2, pp. 131-139, Journal Name: Oxidation Metals, v. 7, no. 2, pp. 131-139; ISSN OXMEA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*LANTHANUM BORIDES-- OXIDATION
BORON OXIDES
HIGH TEMPERATURE
LOW PRESSURE
MEDIUM VACUUM
N50110* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Corrosion & Erosion & Surface Phenomena
OXYGEN
POROSITY
PRESSURE DEPENDENCE
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE