THE CHEMICAL STABILITY OF CARBIDES OF THE TRANSITION ELEMENTS OF THE IV, V AND VI GROUPS (in Russian)
A 0.2 g sample of carbide (270 mesh) was treated with 50 ml of solution for 24 hours in the cold and for 2 hours on boiling. The residue was filtered, dried and weighed to determine the chemical stability. The carbides were tested with HCl(sp. gr=1.19),1:1 HCl, HNO/sub 3/(sp.gr-1.4),1:1 HNO/sub 3/, H/sub 2/SO/ sub 4/ (sp. gr = 1.84) 1:4 H/sub 2/SO /sub 4/, concentrated H/sub 3/PO/sub 4/ 1: 3 H/sub 3/PO/sub 4/, concentrated HClO/sub 4/ 1:3 HCIo/sub 4/, HCl = HNO/sub 3/. (3:l), H/sub 2/SO/sub 4/ + HNO/sub 3/ (1:1), HNO/sub 3/ + HF (4:1), H/sub 3/SO/ sub 4/ = H/sub 2/C/sub 2/O/sub 4/, and H/sub 2/SO/sub 4/ + H/sub 2/ C/sub 2/O/sub 4/, and H/sub 2/C/sub 2/O/sub 4. The carbides of tantalum niobium and tungsten were more stable than the carbides of molybdenum, titanium, zirconium and hafnium. All the carbides dissolved completely in the mixture of nitric acid and hydrofluoric acid. Oxidizing mixtures such as H/sub 2/SO/sub 4/+ were found to be stable in 10% and 20% NaOH. The addition of oxidizing agents to the caustic such as bromine water, 30% H/sub 2/O/sub 2/ or K/sub 3/Fe(CN)/sub 6/ resulted in an increase of the amo unt of carbide dissolved. (TTT)
- Research Organization:
- Inst. of Metalloceramics and Special Alloys, Academy of Science, Ukrainian
- NSA Number:
- NSA-16-002952
- OSTI ID:
- 4832891
- Journal Information:
- Zhur. Priklad. Khim., Journal Name: Zhur. Priklad. Khim. Vol. Vol: 34
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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Related Subjects
CHEMISTRY
CORROSION
CYANIDES
HAFNIUM CARBIDES
HYDROCHLORIC ACID
HYDROGEN PEROXIDES
IRON COMPOUNDS
MOLYBDENUM CARBIDES
NIOBIUM CARBIDES
NITRIC ACID
OXALIC ACID
OXIDATION
PERCHLORIC ACID
PHOSPHORIC ACID
POTASSIUM COMPOUNDS
SODIUM HYDROXIDES
SOLUTIONS
STABILITY
SULFURIC ACID
TANTALUM CARBIDES
TITANIUM CARBIDES
TUNGSTEN CARBIDES
WATER
ZIRCONIUM CARBIDES