Effect of Nano-Al₂O₃ Particles Addition on Thermal Shock Resistance of ZTA/Cordierite Composites

Abstract:

ZTA/cordierite composites were prepared using ZrO₂, Micro-Al₂O₃/Nano-Al₂O₃ and cordierite as raw materials by pressureless sintering. The influence of Nano-Al₂O₃ particles content on phase composition, microstructure and thermal shock resistance of ZTA/cordierite were investigated. The results show that m-ZrO₂, t-ZrO₂ and Al₂O₃ existed in the matrix and t-ZrO₂ content increased with the increase of Nano-Al₂O₃ powders content. By adding Nano-Al₂O₃ powders and ultrasonic dispersion, which can refine grain and promote sintering, the grain size is uniform, the porosity is less and some grains were pulled out, the fracture mode changes from intergranular fracture to intergranular fracture and transgranular fracture. The thermal shock test was carried out at 300°C-1000°C, the critical thermal shock temperature of ZTA ceramic without adding cordierite and Nano-Al₂O₃ particles is 800°C and the residual strength retention rate of the material is only 32.4%. But by adding Nano-Al₂O₃ powers and ultrasonic dispersion 30 min,the residual strength retention rate, relative density, flexural strength and fracture toughness of ZTA/cordierite sintered at 1550°C for 4 h increased greatly and were up to 73.6%, 97.2%, 436 MPa and 4.6 MPa.m^1/2, respectively.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 212-216
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.212
• Online since: August 2018
• Authors: Hai Tao Chen, Zi Jie Zhang, Ling Zhang, Hong Xia Lu, Kai Gao, Hai Long Wang, Rui Zhang
• Keywords: Nano-Al₂O₃ Particles, Thermal Shock Resistance, ZTA/Cordierite Composites

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