ACID STABILITY AND METHODS OF ANALYSIS OF TITANIUM, ZIRCONIUM, NIOBIUM AND TANTALUM NITRIDES (in Russian)
A 0.1 to 0.15 g sample of nitride was treated with 40 to 50 ml of solution for 24 hr in the cold and for 2 hr in the boiling solution. The ssmple was then centrifuged, dried, and weighed, and the content of metal in the solution was determined. The chemical stability can be represented in the order: Zr < Ti < Nb < Ta. Titanium nitride is stable in almost all acids except nitric acid. TiN dissolves almost completely in a mixture of HNO/sub 3/ + HF, 30% H/sub 2/O/sub 2/, a mixture of H/sub 2/SO/sub 4/ + K/sub 2/SO/sub 4/, aqua regia, and nitric acid. In alkali ne solutions TiN dissolves partially with formation of a hydrous precipitate. ZrN is insoluble in the cold in HCl (1: 1) and HClO/sub 4/ (1: 3), but on boiling, 85% dissolves in HCl (1 : 1), 31% in RNO/sub 3/ (1: 1), and 100% in concentrated H/sub 2/SO/sub 4/. ZrN is insoluble in boiling 30% H/ sub 2/O/sub 2/. Niobium nitride is not dissolved in the cold in various acids but dissolves completely in concentrated H/sub 2/SO/sub 4/ and a mixture of HNO/ sub 3/ + HF (1: 1) on boiling. NbN dissolves completely in a boiling mixture of NaOH (10 and 40%) and H/sub 2/O/sub 2/. Tantalum nitride dissolves completely only in a mixture of HNO/sub 3/ + HF or H/sub 2/SO/sub 4/ + K/sub 2/SO/sub 4/ (10 ml + 10 g). On boiling in 10% NaOH + H/sub 2/O/sub 2/, it was found that 61% of the TaN had dissolved. Samples (0.1 g) of ZrN, TiN, NbN, and TaN were fired in a muffle furnace at 1000 tained C to constant weight of the corresponding oxide. Corresponding nitride samples were dissolved either in concentrated H/sub 2/SO/sub 4/ (ZrN and NbN) or in HNO/sub 3/ + HF (TiN and TaN). Firing of the metal cupferronates precipitated frcm the diluted solutions gave results in agreement with those obtained by firing the nitrides directly to the oxides. Nitrogen determinations by the Kjeldahl method on the nitride samples gave consistent results, if the sample was first dissolved in concentrated H/sub 2/SO/ sub 4/ (ZrN and NbN) or in concentrated H/sub 2/SO/sub 4/ + K/sub 2/S O/sub 4/ (10 ml + 5 to 7 g). (TTT)
- Research Organization:
- Inst. of Cermets and Special Alloys, Academy of Sciences, Ukrainian SSR
- NSA Number:
- NSA-14-018960
- OSTI ID:
- 4140822
- Journal Information:
- Zhur. Neorg. Khim., Vol. Vol: 5; Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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Related Subjects
ACIDITY
ACIDS
AMINES
BOILING
CENTRIFUGATION
CHEMICAL REACTIONS
COMBUSTION
CUPFERRON
FURNACES
HIGH TEMPERATURE
HUMIDITY
HYDROCHLORIC ACID
HYDROFLUORIC ACID
HYDROGEN PEROXIDES
MIXING
NIOBIUM NITRIDES
NITRIC ACID
OXIDES
POTASSIUM SULFATES
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
QUANTITY RATIO
SOLUTIONS
STABILITY
SULFURIC ACID
TANTALUM NITRIDES
TITANIUM NITRIDES
WEIGHT
ZIRCONIUM NITRIDES