Effect of the Cooling Ways on the Properties and Microstructure of ZrO₂/ZrW₂O₈ Ceramic Composites

Abstract:

ZrO₂ has been widely used due to its good physical and chemical properties and the ZrO₂/ZrW₂O₈ ceramic composites with adjustable thermal expansion coefficient can be prepared by mixing and sintering the ZrO₂ and ZrW₂O₈ powders. In this paper, the ZrO₂/ZrW₂O₈ ceramic composites have been prepared by mixing, cold isostatic pressing and atmospheric sintering, and then being cooled in air or in water. We focus on the effect of the cooling ways on the properties and microstructure of the ZrO₂/ZrW₂O₈ ceramic composites. The results show that the relative density of all samples is more than 98%. For the in-situ method, the density and flexural strength of the samples cooled in air and in water are 98.1% and 98.4%, 112.96MPa and 45.23MPa, respectively. The ZrW₂O₈ content and thermal expansion coefficient of the samples cooled in the air are less and higher than those in the water, respectively. For the direct mixture method, the density and flexural strength of the samples cooled in air and in water are 98.9% and 99.3%, 195.99MPa and 58.71MPa, respectively. For the four groups of the composite samples, they behave better mechanical properties after cooled in air, and lower thermal expansion coefficients after cooled in water.

• Periodical: Key Engineering Materials (Volume 697)
• Pages: 381-385
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.697.381
• Online since: July 2016
• Authors: Jin Ping Li*, Cheng Yang, Song He Meng, Fa Jun Yi, Yu Han Li
• Keywords: Ceramic Composites, Cooling Ways, Low Thermal Expansion, ZrO₂/ZrW₂O₈

References

[1] J. S. O. Evans, T. A. Mary, T. Vogt, M. A. Subramanian, and A. W. Sleight, Negative Thermal Expansion in ZrW2O8 and HfW2O8, Chem. Mater. 1996, 8, 2809-2823.

DOI: 10.1002/chin.199711004

[2] John S. O. Evans, Negative thermal expansion materials, Chem. Soc., Dalton Trans., 1999, 3317-3326.

DOI: 10.1039/a904297k

[3] G. Ernst, C. Broholm, G. R. Kowach, A. P. Ramirez, Phonon density of states and negative thermal expansion in ZrW2O8, Nature (Landon) 396, 147-149 (1998).

DOI: 10.1038/24115

[4] P. Lommens, C. De Meyer, E. Bruneel, K. De Buysser, I. Van Driessche, S. Hoste, Synthesis and thermal expansion of ZrO2/ZrW2O8 composites, Journal of the European Ceramic Society 25 (2005) 3605-3610.

DOI: 10.1016/j.jeurceramsoc.2004.09.015

[5] Eiki Niwa, Shuhji Wakamito, Takaaki Ichikawa, Shaorong Wang, Takuya Hashimoto, Kohji Takahashi, Yuko Morito, Preparation of dense ZrO2/ZrW2O8 cosintered ceramics with controlled thermal expansion coefficients, Journal of Ceramics Society of Japan 112, 271-275 (2004).

DOI: 10.2109/jcersj.112.271

[6] Xinbo Yang, Xiaonong Cheng, Xuehua Yan, Juan Yang, Tingbo Fu, Jie Qiu, Synthesis of ZrO2/ZrW2O8 composites with low thermal expansion, Composites Science and Technology 67 (2007) 1167-1171.

DOI: 10.1016/j.compscitech.2006.05.012

[7] Hongfei Liu, Zhiping Zhang, Xiaonong Cheng, Juan Yang, Thermal expansion of ZrO2-ZrW2O8 Composites prepared using co-precipitation route, International Journal of Modern Physics B, Vol. 23, Nos. 6-7 (2009) 1449-1454.

DOI: 10.1142/s0217979209061081

[8] Guo Xiangyang, Cheng Chunxiao. Preparation of ZrO2/ZrW2O8 Composites and Study of Its Thermal Expansion, Journal of Luoyang Institute of Science and Technology (Natural Science Edition), 2014, 24(3): 82-86 (in Chinese).

[9] Klaartje de Buysser, Petra Lommens, C. de Meyer, Els Bruneel, Serge Hoste, Isabel Van Driessche, ZrO2-ZrW2O8 composites with tailor-made thermal expansion, Ceramics - Silikáty 48, (4) 139-144 (2004).

DOI: 10.1016/j.jeurceramsoc.2004.09.015

[10] Jinping Li, Yuhan Li, Songhe Meng, Fajun Yi, and Yanwei Zhu, Study on the Preparation Processes of the ZrO2/ZrW2O8 Ceramic Composites, Rare metal materials and Engineering, 2015(S1), accepted (in Chinese).