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Effect of YSZ fiber addition on microstructure and properties of porous YSZ ceramics

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Abstract

Yttria-stabilized zirconia (YSZ) fiber was introduced as the reinforcement for porous YSZ ceramics fabricated by tert-butyl alcohol-based gel-casting process and pressureless sintering. Effect of YSZ fiber addition on the microstructure and properties of porous YSZ ceramics was studied systematically. Results showed that YSZ fiber obviously obstructed densification during the sintering process and therefore higher porosity could be achieved with the same solid loading of the initial slurry. Mean pore size regularly increased with increasing fiber addition. The reinforcing effect reached its optimum with 10 wt% YSZ fiber addition, yet decreased with increasing porosity. Fiber addition significantly changed the fracture mode of the porous ceramics from brittle to quasi-ductile with increasing fiber additions; fiber pull-out and crack deflection play major roles in the process. Compared with the porous ceramics without fibers, the thermal conductivity decreased a little. With improved mechanical and thermal properties, YSZ fiber-reinforced porous YSZ ceramics are more applicable in thermal insulation materials.

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Acknowledgements

The authors would like to thank the financial support from the National Natural Science Foundation of China (NSFC-No. 90816019, 51172119 and 51102140).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing, 100084, China

    Yanhao Dong, Chang-An Wang & Jun Zhou

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  1. Yanhao Dong
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  2. Chang-An Wang
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  3. Jun Zhou
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Correspondence to Chang-An Wang.

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Dong, Y., Wang, CA. & Zhou, J. Effect of YSZ fiber addition on microstructure and properties of porous YSZ ceramics. J Mater Sci 47, 6326–6332 (2012). https://doi.org/10.1007/s10853-012-6555-3

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  • DOI: https://doi.org/10.1007/s10853-012-6555-3

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