Action of salts on the strength and crack resistance of silicon nitride ceramics
As a result of the uniqueness of a number of their physicomechanical properties, ceramics based on silicon nitride and carbide have found use in the development of critical engine parts operating at high temperatures. The purpose of this work was to investigate the action of sodium sulfate, sodium chloride and sea salt on the strength and crack resistance of a reaction-sintered ceramic based on silicon nitride containing 40% silicon carbide and 2% magnesium oxide as additions. The composition, method of production, and properties of this ceramic, called NKKKM-81. are described in detail by Gogotsi. To investigate the influence of oxidation of the material in the presence of salts on the mechanical properties of the ceramic, the samples were impregnated with a solution of the salt and heated in air to the specified temperature. The authors note that the action of sodium salts leads to a decrease in the mechanical properties of the silicon nitride ceramic, and to determine as a result the effective life of parts of this class of materials it is necessary to study the influence of the working medium on their mechanical characteristics.
- Research Organization:
- Institute of Strength Problems, Academy of Sciences of the Ukrainian SSR, Kiev
- OSTI ID:
- 5954739
- Journal Information:
- Strength Mater. (Engl. Transl.); (United States), Journal Name: Strength Mater. (Engl. Transl.); (United States) Vol. 16:11; ISSN SMTLB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330100 -- Internal Combustion Engines
330200 -- External Combustion Engines
36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CERAMICS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CRACKS
ENGINES
FABRICATION
HEAT ENGINES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
SINTERING
SODIUM COMPOUNDS
SODIUM SULFATES
SULFATES
SULFUR COMPOUNDS
TEMPERATURE EFFECTS