Improving the comprehensive properties of ZrO2-C materials with aid of TiO2 addition

YY Gao and Z Yu and CY Guo and EH Wang and XH Liu and EX Xu and ZJ He and XM Hou, CERAMICS INTERNATIONAL, 50, 17720-17726 (2024).

DOI: 10.1016/j.ceramint.2024.02.260

Owing to the harsh working condition, the ZrO 2 - C materials used in the slag line in the submerged entry nozzle are confronted with serious slag erosion. In order to solve this issue, different amounts of TiO 2 addition ranging from 0 to 6 wt% are added and their effects on the erosion resistance of ZrO 2 - C materials in addition to phase composition, microstructure, physical properties and high -temperature mechanical properties are investigated in this work. When the sintering temperature is above 1400 degrees C, fine TiC grains and SiC whiskers are in -situ formed and distributed around ZrO 2 particles, which can reinforce the matrix and improve the strength of ZrO 2 - C materials. With the amount of TiO 2 addition increasing, the cold strength of ZrO 2 - C materials increases while the high -temperature strength slightly decreases. Combining with the erosion resistance, the optimum amount of TiO 2 in ZrO 2 - C materials is determined to be 4 wt%, in which the cold compressive strength (46.13 MPa), the cold modulus of rupture (35.12 MPa) and the residual strength after thermal shock (15.01 MPa) reach the maximum. Based on this, the promotion mechanism of erosion resistance is further discussed with aid of molecular dynamics simulation.

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