Effect of Needle Coke on Gas Permeability of Ceramic Casting Molds

  • Fei Wang (王飞)
  • Guoliang Zhu (祝国梁)
  • Fei Li (李飞)Email author
  • Baode Sun (孙宝德)


The permeability of a new investment casting mold system prepared by adding needle cokes has been investigated in this work. The permeability tests of the molds were carried out at the temperature of 25–1200 °C. The results showed that the addition of needle cork could significally increase the permeability of the molds by a factor of about 4 because the burning of needle cokes increased the porosities of the molds. Meanwhile, the needle coke modified molds exhibited higher green strength and greater thickness both on flat section and at sharp edges compared with the full fused silica mold. Taking account of the mold thickness, the needle coke modified molds had increased adjusted fracture load (AFL) by a factor of about 2 at the test temperature of 25–1200 °C. The addition of needle coke significally improved the permeability of the molds during both autoclaving and casting, and optimized the correlation between the permeability and green strength of the molds.

Key words

permeability mold needle coke strength investment casting 

CLC number

TB 321 

Document code


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Copyright information

© Shanghai Jiaotong University and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Fei Wang (王飞)
    • 1
  • Guoliang Zhu (祝国梁)
    • 1
  • Fei Li (李飞)
    • 1
    Email author
  • Baode Sun (孙宝德)
    • 1
    • 2
  1. 1.Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision FormingShanghaiChina
  2. 2.The State Key Laboratory of Metal Matrix CompositesShanghaiChina

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