Use of glassy carbon vessels in the analysis of refractory nitrides, carbides, and borides

Journal Article · Tue Apr 01 04:00:00 EST 1986 · Ind. Lab. (Engl. Transl.); (United States)

OSTI ID:6815354

Kustova, L V; Larkina, A N; Smirnova, N V

This paper reports further work on the use of glassy carbon vessels for the analysis of refractory nitrides, carbides, and borides. A mixture of sodium hydroxide and alkali nitrates was examined to see whether it could be employed to carry out the fusions under milder conditions and thus lower the intensity of glassy carbon oxidation. The boron and silicon nitrides fused completely in 3-5 min at 600 degrees C. According to the results obtained the proposed method of breaking down the above refractory compounds is simple, rapid, and reliable. Lowering the glassy carbon oxidation rate by using nitrates as oxidants left the working crucible surface smooth and allowed it to be used for 60 to 70 fusions. The determination of total boron in BN and B/sub 4/ C is also studied, and an analysis of chromium carbide is presented.

• Research Organization: Institute of Chemical Physics, Moscow Province
• OSTI ID: 6815354
• Journal Information: Ind. Lab. (Engl. Transl.); (United States), Journal Name: Ind. Lab. (Engl. Transl.); (United States) Vol. 52:4; ISSN INDLA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
ALLOYS
BORIDES
BORON CARBIDES
BORON COMPOUNDS
BORON NITRIDES
CARBIDES
CARBON COMPOUNDS
CHEMICAL ANALYSIS
CHEMICAL REACTORS
CHROMIUM CARBIDES
CHROMIUM COMPOUNDS
ELEMENTS
IMPURITIES
METALS
NITRIDES
NITROGEN COMPOUNDS
PHASE STUDIES
PNICTIDES
QUANTITATIVE CHEMICAL ANALYSIS
QUANTITY RATIO
REFRACTORIES
REFRACTORY METALS
SAMPLE PREPARATION
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS