The development of new super-hard ceramic materials for application in extreme conditions

Work number - M 52 FILED

Authors:

SolodkyiI. V., TrosnikovaI.Yu.

The presented scientific work"The development of new super-hard ceramic materials for application in extreme conditions"

The work is dedicated to the development of super-hard ceramic materials with high strength in order to effectively work in extreme conditions: large dynamic loads, abrasive wear in aggressive environments and at high temperatures. Physicochemical bases of preparation of the super hard ceramic materials which based on the controlling of structure during directional solidification of eutectic alloy of Mo-Si-B, WC-W2C and obtaining high density B₆O- based ceramic with appropriate phase composition by spark plasma sintering (SPS) processing were shown. New composite reinforced materials, which are representing a matrix of W₂C, reinforced by WC fiber, which are: 1.5 times higher rigidity, 2 times strength and 3 times wear resistance; and alloy relit doped molybdenum, which has 30-35% higher hardness 1.5-2 times the strength and durability by 40-50% were fabricated. B6O based ceramics with a hardness of about 40,8±1,3 GPa, and fracture toughness of 4,8±0,2 MPa∙m^1/2 were developed, which are much higher than the world analogues by 35% and 20%, respectively.

According to materials of the scientific work pilot batch of powder alloy relit was produced at «Interdisciplinary Research and Production Center" Epsilon LTD "( Ivano-Frankivsk city), which demonstrated the technical and economic feasibility of hard facing alloy relit doped molybdenum, the working surface screws presses, extruders. According to the results of tests developed alloys are recommended for implementation in industrial production.

On the global level of work indicates that the test of B6O-based ceramics were conducted in the laboratory of Temasek, Nanyang Technological University (Singapore) and recommended for body armor and high speed cutting tool applications.

The resulting material can be used at high temperatures up to 1300 °C, thus increasing the operating temperature by 20%, reducing the share of construction by 27% and reducing the negative impact on the environment, which, in turn, demonstrates their economic indicator (20-30 %), energy, environmental and technological efficiency.

The results of research on the topic of work were published in 13 scientific articles (including 8 in SCOPUS database), 18 thesis at international conference. The general publications citation index is 17 (according to Scopus database), h-index = 4. The total number of publications is 31.