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Effects of adding aluminum oxide or zirconium oxide fibers on ceramic molds for casting hollow turbine blades

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Abstract

To satisfy the requirements of mechanical performances of integral Al2O3-matrix ceramic mould for fabricating hollow turbine blades, Al2O3 or ZrO2 fibres were added to the slurry in gelcasting. The microstructures of Al2O3-matrix ceramic mould were tested by scanning electron microscope and micron X-ray imaging system besides their bending strengths at different temperatures. The result showed that when Al2O3 fibre or ZrO2 fibre were added, the room-temperature bending strength of the ceramic mould was remarkably improved after pre-sintering at 1,250 °C. The medium-temperature bending strength was about between 0.5 and 2 MPa from 400 to 600 °C and reached the minimum at 500 °C. At 1,300 °C, the high-temperature bending strengths decreased gradually with an increase of Al2O3 fibre content and increased with an increase of ZrO2 fibre content. The specimens expanded first in pre-sintering and then shrunk in final sintering, respectively. According to the test results, we used ZrO2 as the additive with 10 wt% content, and the overall performances of Al2O3-matrix ceramic mould were the best. Finally, hollow turbine blades were successfully fabricated.

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Authors and Affiliations

  1. State Key Laboratory of Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Z. L. Lu, Y. X. Fan, K. Miao, H. Jing & D. C. Li

  2. Co-Innovation Center for Advanced Aero-Engine, Xi’an, 710049, China

    Z. L. Lu, K. Miao & H. Jing

Authors
  1. Z. L. Lu
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  2. Y. X. Fan
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  3. K. Miao
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  4. H. Jing
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  5. D. C. Li
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Correspondence to D. C. Li.

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Lu, Z.L., Fan, Y.X., Miao, K. et al. Effects of adding aluminum oxide or zirconium oxide fibers on ceramic molds for casting hollow turbine blades. Int J Adv Manuf Technol 72, 873–880 (2014). https://doi.org/10.1007/s00170-014-5723-9

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  • DOI: https://doi.org/10.1007/s00170-014-5723-9

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