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2. Synthesis and mechanism of TiB2–TiN ceramic composites by high-pressure method

Author

Mei Hua Hu, Yue Yue Wang, Shang Sheng Li, Ning Bi, Ming Ming Liu, and Yong Li

Subjects
010302 applied physics, Materials science, Process Chemistry and Technology, chemistry.chemical_element, 02 engineering and technology, Raw material, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, Grain size, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry, High pressure, visual_art, 0103 physical sciences, Vickers hardness test, Materials Chemistry, Ceramics and Composites, visual_art.visual_art_medium, Relative density, Ceramic, Composite material, 0210 nano-technology, Tin
Abstract

Using pure Ti and hexagonal-BN powder as raw materials, TiB2–TiN ceramic composites were synthesized by high-pressure method at 5.0 GPa and 1400–1800 °C. The phase composition, microstructure, density and hardness of TiB2–TiN ceramic composites were analyzed. The results shown that when the pressure was constant, the synthesis temperature had an important effect on the phase composition of the samples. When TiB2–TiN ceramic composites synthesized at 1800 °C for 30 min, the relative density reached 96.2% and the maximum Vickers hardness reached 17.9 GPa with the load of 4.9 N. The grain size of the TiB2–TiN ceramic composites changed with the change of synthesis temperature, which resulted in the change of density and hardness.

Published
2021

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