The effect of silicon carbide and/or graphene platelets addition with different size and morphology on microstructure development, mechanical and tribological properties of TiB2-SiC-GPs and TiB2-GPs ceramic composites fabricated by field-assisted sintering technology has been investigated.  The main focus is on the development and fabrication of wear-resistant components working at extreme conditions. Instrumented hardness, bending strength, chevron-notched fracture toughness, ball on flat tribological tests, SEM/FIB microscopy, and Raman spectroscopy  were used for the testing and characterization of the investigated cerramics. The addition of SiC significantly improved the bending strength and elastic modulus, but decreased the fracture toughness of composites. The increasing of GPs addition to TiB2-20 % SiC from 1 to 10 wt. % resulted in significantly improved densification, but reduced hardness and elastic modulus. The highest strength was measured for the system TiB2-20SiC-2GPs with the value of 729 MPa and the highest fracture toughness for the system TiB2-20SiC-10GPs with values 6.2 MPa.m1/2. The low coefficient of friction, below 0.5 above  5 wt.%  GPs addition and very low specific wear rate 10-7 mm3/N.m were noticed because  the formation of zones of tribochemical layer on the worn surfaces. The increasing amount of graphene platelets has a positive influence on wear characteristics of the composites thanks to the observed wear mechanisms.
Acknowledgement
This work was supported by the Slovak Research and Development Agency under the contract no. APVV-21-0402 and SK-UA-21-0074. The support of the VEGA projects no. 2/0118/20 and2/0175/21 is also greatly acknowledged.