DETERMINATION OF ZIRCONIUM, BORON, CARBON, AND SILICON IN ZIRCONIUM DIBORIDE (in Japanese)
Chemical propertie; of zirconium diboride prepared by carbothermic reduction of mixture of ZrO/sub 2/ and B/sub 2/O/sub 3/ were studied, and methods for the determination of Zr, B, C, and Si were investigated. It was found thnt sodium carbonate fusion was the most practical means for disolution of zirconium diboride for the determination of Zr and B in a single sample. The melt was digested with water, and Zr was separated by filtering. Boron in the filtrate, after neutralization, removal of CO/sub 2/, and the addition of mannite, was titrated with 0.1N NaOH solution from pH 7.0 to the end poirt of pH 8.3. The residue, of which the major part was ZrO/sub 2/, was fused with K/sub 2/S/sub 2/O/ sub 7/, and the melt obtained was dissolved in dilute H/sub 2/SO/sub 4/. Zirconium in the solution was precipitated by cupferron, ignited to ZrO/sub 2/, and weighed. Carbon was volumetrically determined by the combustion method, using Pb/sub 3/O/sub 4/ or CuO as an accelerator. Silicon was determined colorimetrically as silicomolybdate by dissolving the sample in a mixture of 3N HF and 2N HNO/sub 3/ at 70 approximates 80 deg C. Fluoride was masked by H/sub 3/BO/sub 3/, ammonium molybdate was added, and pH was adjusted between 1.2 and 1.3. Molybdenum blue method was used for low concentrations of silicon. The method was also successfully applied for the analysis of hafnium diboride. (auth)
- Research Organization:
- Institute of Physical and Chemical Research (RIKEN), Tokyo (Japan)
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-019882
- OSTI ID:
- 4032122
- Journal Information:
- Bunseki Kagaku (Japan), Vol. Vol: 13; Other Information: Orig. Receipt Date: 31-DEC-64
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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Related Subjects
ACIDITY
AMINES
BORON
BORON OXIDES
CARBON
CARBON DIOXIDE
CHEMICAL REACTIONS
COLOR
COMBUSTION
COPPER OXIDES
CUPFERRON
DEGASSING
FUSED SALTS
HAFNIUM BORIDES
HYDROFLUORIC ACID
LEAD OXIDES
MASKING AGENTS
MOLYBDENUM BLUE
MOLYBDENUM OXIDES
NITRIC ACID
POTASSIUM SULFATES
PRECIPITATION
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
RESIDUES
SEPARATION PROCESSES
SILICON
SILICON BORIDES
SILICON OXIDES
SODIUM CARBONATES
SODIUM HYDROXIDES
SOLUTIONS
STANDARDS
SULFURIC ACID
TITRATION
WATER
ZIRCONIUM
ZIRCONIUM COMPLEXES
ZIRCONIUM OXIDES