Advertisement

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)
Article
First Online:
  • 8 Downloads

Abstract

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

A 
This is a preview of subscription content, log in to check access.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    PATTNAIK S, KARUNAKAR D B, JHA P K. Developments in investment casting process: A review [J]. Journal of Materials Processing Technology, 2012, 212(11): 2332–2348.CrossRefGoogle Scholar
  2. [2]
    SARIDIKMEN H, KUSKONMAZ N. Properties of ceramic casting molds produced with two different binders [J]. Ceramic International, 2005, 31(6): 873–878.CrossRefGoogle Scholar
  3. [3]
    MUELLER H J. Particle and pore size distributions of investments [J]. Journal of Oral Rehabilitation, 1986, 13(4): 383–393.CrossRefGoogle Scholar
  4. [4]
    REZA F, TAKAHASHI H, IWASAKI N, et al. Effects of investment type and casting system on permeability and castability of CP titanium [J]. The Journal of Prosthetic Dentistry, 2010, 104(2): 114–121.CrossRefGoogle Scholar
  5. [5]
    SYVERUD M, HERO H. Mold filling of Ti castings using investments with different gas permeability [J]. Dental Materials, 1995, 11(1): 14–18.CrossRefGoogle Scholar
  6. [6]
    MATYSIAK H, HARATYM R, KLABCZYK M. Gas flow through a multilayer ceramic mould in lost wax foundry process [J]. Archievs of Foundry Engineering, 2009, 9(2): 155–158.Google Scholar
  7. [7]
    YUAN C, JONES S, BLACKBURN S. Development of a new ferrous aluminosilicate refractory material for investment casting of aluminum alloys [J]. Metallurgical and Materials Transactions A, 2012, 43(13): 5232–5242.CrossRefGoogle Scholar
  8. [8]
    YUAN C, JONES S. Investigation of fibre modified ceramic moulds for investment casting [J]. Journal of the European Ceramic Society, 2003, 23(3): 399–407.CrossRefGoogle Scholar
  9. [9]
    JONES S, YUAN C. Advances in shell moulding for investment casting [J]. Journal of Materials Processing Technology, 2003, 135(2/3): 258–265.CrossRefGoogle Scholar
  10. [10]
    DOLES R S, VIERS D S. Filler component for investment casting slurries: US20070931330 [P]. 2008-02-28 [2018-11-06].Google Scholar
  11. [11]
    LU K, LIU X D, DU Z X, et al. Properties of hybrid fibre reinforced shell for investment casting [J]. Ceramics International, 2016, 42(14): 15397–15404.CrossRefGoogle Scholar
  12. [12]
    KLINE D M, LEKAKH S N, RICHARDS V L. Improving investment casting mold permeability using graphite particles [J]. Transactions of the American Foundry Society, 2010, 118: 159–165.Google Scholar
  13. [13]
    YUAN C, JONES S, BLACKBURN S. The influence of autoclave steam on polymer and organic fibre modified ceramic shells [J]. Journal of the European Ceramic Society, 2005, 25(7): 1081–1087.CrossRefGoogle Scholar
  14. [14]
    KLINE D M. Controlling strength and permeability of silica investment casting molds [D]. Rolla, MO, USA: Missouri University of Science and Technology, 2010.Google Scholar
  15. [15]
    PARK C W, YOON S H, OH S M. An EVS (electrochemical voltage spectroscopy) study for the comparison of graphitization behaviors of two petroleum needle cokes [J]. Carbon, 2000, 38(9): 1261–1269.CrossRefGoogle Scholar
  16. [16]
    WANG F, LI F, HE B, et al. Microstructure and strength of needle coke modified ceramic casting molds [J]. Ceramics International, 2014, 40(1): 479–486.CrossRefGoogle Scholar
  17. [17]
    Investment Casting Institute. Ceramics testing guidebook [M]. New Jersey: Investment Casting Institute, 1989.Google Scholar
  18. [18]
    JONES S, JOLLY M R, LEWIS K. Development of techniques for predicting ceramic shell properties for investment casting [J]. British Ceramic Transactions, 2002, 101(3): 106–113.CrossRefGoogle Scholar
  19. [19]
    KOPONEN A, KATAJA M, TIMONEN J. Permeability and effective porosity of porous media [J]. Physical Review E, 1997, 56(3): 3319–3325.CrossRefGoogle Scholar
  20. [20]
    KOPONEN A, KATAJA M, TIMONEN J. Tortuous flow in porous media [J]. Physical Review E, 1996, 54(1): 406–410.CrossRefGoogle Scholar

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

Personalised recommendations

Cite article

Buy options