CHEMICAL STABILITY AND HYDROLYTIC DECOMPOSITION OF THE DIBORIDES OF CERTAIN TRANSITION METALS INTERACTING WITH ACIDS (in Russian)
Journal Article
·
· Zhur. Priklad. Khim.
OSTI ID:4137484
The mechanism of the irteraction of Zr, Ti, and Cr diborides with HCl, H/ sub 2/SO/sub 4/, and HNO/sub 3/ was investigated and compared with acid resistant compounds such as B/sub 4/C and MoSi/sub 2/. The test specimens were prepared by hot pressing, in graphite molds at 1800 tained C and 100 kg/cm/sup 2/, powders which. were prepared (a.) by reducing metal and boric oxide mixtures with carbon; (b.) by vacuum reduction with boron carbide; and (c.) by electrolysis of molten salt mixtures. Test showed that the electrolytically prepared ZrB/sub 2/ and TiB/sub 2/ specimens are soluble in HCl but to a much lesser degree than the corresponding samples prepared by the other two methods. Addition of Si lowered the acid resistance of all the substances studied. CrB/sub 2/ was decomposed by cold, ZrB/sub 2/ by slightly heated HCl. Hydrolysis of these borides yielded H/ sub 2/, boron hydrides, and boric oxide. The formation of suboxides reduced the amount of H/sub 2/ liberated during the reaction,-specifically, TiB/sub 2/ yielded less hydrogen than calculated from the equations stipulated for the reaction. The various higher boron hydrides such as B/sub 2/H/sub 6/ and B/sub 4/ H/sub 10/ passed through a primary stage of BH/sub The hydrolytic decomposition and the polymerization of the reaction prcducts might be influenced by an as yet unknown catalyst. (TTT)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-14-019482
- OSTI ID:
- 4137484
- Journal Information:
- Zhur. Priklad. Khim., Journal Name: Zhur. Priklad. Khim. Vol. Vol: 33
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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Related Subjects
BORON CARBIDES
BORON HYDRIDES
BORON OXIDES
CARBON
CASTING
CATALYSIS
CHEMICAL REACTIONS
CHROMIUM BORIDES
COOLING
DECOMPOSITION
ELECTROLYSIS
EQUATIONS
FUSED SALTS
GRAPHITE
HEATING
HIGH TEMPERATURE
HOT WORKING
HYDROCHLORIC ACID
HYDROGEN
HYDROLYSIS
METALS
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
MOLYBDENUM COMPOUNDS
NITRIC ACID
NUMERICALS
POLYMERIZATION
POWDERS
PREPARATION
PRESSURE
REDUCTION
SAMPLING
SILICIDES
SILICON
SOLUBILITY
STABILITY
SULFURIC ACID
TESTING
TITANIUM BORIDES
VACUUM
ZIRCONIUM OXIDES
BORON HYDRIDES
BORON OXIDES
CARBON
CASTING
CATALYSIS
CHEMICAL REACTIONS
CHROMIUM BORIDES
COOLING
DECOMPOSITION
ELECTROLYSIS
EQUATIONS
FUSED SALTS
GRAPHITE
HEATING
HIGH TEMPERATURE
HOT WORKING
HYDROCHLORIC ACID
HYDROGEN
HYDROLYSIS
METALS
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
MOLYBDENUM COMPOUNDS
NITRIC ACID
NUMERICALS
POLYMERIZATION
POWDERS
PREPARATION
PRESSURE
REDUCTION
SAMPLING
SILICIDES
SILICON
SOLUBILITY
STABILITY
SULFURIC ACID
TESTING
TITANIUM BORIDES
VACUUM
ZIRCONIUM OXIDES