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Updated: Oct 10, 2025
Preparation and Reactivity of Gasless Nanostructured Energetic Materials
Published on: April 2, 2015
Microstructure and Mechanical Properties of TiN-TiB2-hBN Composites Fabricated by Reactive Hot Pressing Using TiN-B
Qianglong He1, Tian Tian1, Shi Tian1
1The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.
Abstract:
In this study, TiN-TiB2-hBN composite ceramics were prepared via reactive hot pressing using TiN and amorphous B powders as raw materials. Different sintering temperatures and composition ratios were studied. The results show that the 70 vol% TiN-17.6 vol% TiB2-12.4 vol% hBN ceramic composites obtained ideal comprehensive properties at 1600 °C. The relative density, Vickers hardness, bending strength, and fracture toughness were 99%, 11 GPa, 521 MPa, and 4.22 MPa·m1/2, respectively. Densification was promoted by the highly active reaction product TiB2, and the structural defects formed in the grains. Meanwhile, the good interfacial bonding between TiN and TiB2 grains and the uniform dispersion of ultrafine hBN in the matrix contributed to the excellent bending strength. Moreover, the toughening mechanism of crack deflection and grain pull-out improved the fracture toughness.
