GAO Xiaoju ¹, SHI Chao ², LI Leilei ³, ZI Hai ², BAO Yuguang ¹, WANG Yanli ¹

(1. No. 52 Institute of China North Industry Group, Yantai 264003, Shandong, China; 2. Norincogroup Inner Mongolia North Heavy Industries Group Corpltd, Baotou 014034, Neimenggu, China; 3. Northwest Engineering Corporation Limited, Xi’an 710065, Shaanxi, China)

Abstract: Hexagonal boron nitride ceramic (h-BN) based on the nitridation of B powders was obtained by reaction sintering method. The dynamic compressive response was investigated using a Split Hopkinson pressure bar tester at high strain rates in a range of 0.8×10³-1.6×10³ s^-1. By increasing the strain rate, the dynamic strength and the failure strain increased continuously. The dynamic loading mode of h-BN ceramic exhibited three deformation regions, including an inelastic deformation region, rapid loading region and failure region. The dynamic failure mode of h-BN ceramic depended upon the strain rate.
Key words: h-BN ceramic; reaction sintering; dynamic compressive; damage mechanism