METHOD FOR PRODUCING NANOCERAMICS BY METHOD OF COMBINING SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS AND SPARK PLASMA SINTERING Russian patent published in 2017 - IPC C04B35/573 C04B35/575 C04B35/563 C04B35/645 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: method for producing the ceramic materials includes milling and high-energy mixing of the initial reactants in a high-energy planetary ball mill by milling balls in the argon atmosphere, and the subsequent simultaneous synthesis-sintering of the reaction mixture Si/C, or B/C, or Si/B/C. Milling and mixing are carried out at a weight ratio of the balls and the initial powders (20:1)-(40:1), with the ball mill rotating speed of 694-900 rev/min and the processing time of up to 15 minutes, and the process of combining the self-propagating high-temperature synthesis and the spark plasma sintering (SHS+SPS), i.e. the simultaneous synthesis-sintering of the reaction mixture is carried out at the spark plasma sintering plant; for this purpose, the reaction mixture is placed into a graphite cylindrical press-mould, fixed between the electrodes, which simultaneously act as press punches, put the press-mould into the chamber, vacuum or inert gas atmosphere is created in the chamber, and pulsed electric current of 1000-5000 A under the load up to 50-90 MPa is passed through the sample to be sintered. The process duration is 5-10 minutes.

EFFECT: lower energy costs, excluding the application of various sintering activators, improving the physical and mechanical properties of the resulting material.

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