Registration Number
0220U102111,
0117U000855
, R & D reports
Title
Development of a manufacturing technology of ceramic bearings with the self-healing effect for operation under extreme conditions of corrosive media.
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Head
Zghalat-Lozynskyi Ostap B., Доктор технічних наук
Registration Date
09-03-2020
Organization
Institute for Problems in Materials Science
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The aim of the work is to investigate the consolidation of powders of nanocomposite Si3N4-ZrN(ZrС) materials by the spark-plasma sintering method, determine the technological parameters of the preparation process of porousless ceramics, and study the microstructure and tribological properties. For the investigation of the process of consolidation by the method of spark-plasma sintering of ultradisperse composite powders based on the Si3N4-ZrN and Si3N4–ZrN0.5С0.5 systems, pilot batches of powders in a wide concentration range (from 11 vol.% up to 33 vol.% ZrN) were obtained, and processes of their deagglomeration and alloying were optimized. The study of the consolidation process of ultradisperse powders of the composite materials of the ZrN-Si3N4 system showed advantages of nonlinear SPS modes. This investigation made it possible to obtain homogeneous structures with a grain size less than 500 nm and a high relative density of 0.97 at temperatures lower by (150-300)оC than those in one-stage (1700-1800оС) SPS modes and choose the optimal composition of the composite Si3N422vol.%ZrN+(Y2O3+Al2O3), which showed high mechanical properties: a hardness of (23–26) GPa, fracture toughness of 6.2 MPa·m1/2, and bend 363 MPa. SPS was successfully used to obtain small batches of porousless blanks of ceramic balls 16 mm in diameter.
Product Description
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Ieremenko Liudmyla I
Zyatkevich Dmytro P
Krushynska Larysa A
Kud Iryna V
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2020-04-02
