Reliability of Slip Cast Silicon Nitride Components

  • M. E. Rorabaugh
  • K. H. Styhr
Part of the Army Materials Technology Conference Series book series (volume 1)


The slip casting process has been applied to several classes of silicon nitride materials systems; however, the majority of effort has been focused on slip casting silicon with subsequent nitriding of net shape components to the final silicon nitride form. This process has many steps with potential difficulties in each, such as raw material control, preparation of the casting slip, preparation of the mold system, the process of casting and solidification, removal of the part from the mold, and its subsequent drying, sintering, finishing and nitriding operations. Process variables in each of these steps are identified along with the current quality control inspection and evaluation methods. Deficiencies are identified and the need for improved techniques for finding critical defects early in the process cycle and tracing them to their source and to the elimination of the cause is stressed.


Silicon Nitride Silicon Powder Slip Cast Casting Rate Stator Vane 
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  1. 1.
    A. Ezis, “The Fabrication and Properties of Slip-Cast Silicon Nitride,” in J.J. Burke, A.E. Gorum, and R.N. Katz, Editors, Ceramics for High Performance Applications, pp. 207–222, Brook Hill Publishing Cortpany, 1974.Google Scholar
  2. 2.
    D.R. Messier and P. Wong, “Kinetics of Forration and Mechanical Properties of Reaction-Sintered Si3N4,” pp. 181–193, ibid.Google Scholar
  3. 3.
    T.P. Herbell, T.K. Glassgcw, and H.C. Yeh, “Effect of Attrition Milling on the Reaction Sintering of Silicon Nitride,” DOE/NASA/ 1040-78/2, NASA TM-78965, May 1978.Google Scholar
  4. 4.
    Jar, Ball, and Pebble Milling, “Theory and Practice,” Norton Bulletin P-291.Google Scholar
  5. 5.
    J.A. Mangles, “Development of a Creep-Resistant Reaction Bonded Si3N4,” pp. 195–206 in ref. 1.Google Scholar
  6. 6.
    AiResearch Report No. 76-212188(7), Ceramic Gas Turbine Engine Demonstrator Program, Interim Report Number 7 (Quarterly), Prepared under contract N00024-76-C-5352 pp. 4-49 to 4-52 November, 1977.Google Scholar
  7. 7.
    J.A. Mangels, “Development of Injection Molded Reaction Bonded Si3N4,” in J.J. Burke, E.N. Lenoe, and R.N. Katz, Editors, Ceramics for High Performance Applications — II pp. 113–130, Brook Hill Publishing Company, 1978.Google Scholar
  8. 8.
    J.A. Mangels and R.M. Williams, Development of Moldable, High Density Reaction Bonded Silicon Nitride, Interim Report Number 12 (Quarterly), Prepared under contract DEN 3–20, April, 1979.Google Scholar
  9. 9.
    D. Carruthers, D. Richerson and K. Benn, “Combustion Rig Durability Testing of Turbine Ceramics,” elsewhere in this volume.Google Scholar
  10. 10.
    P.E.D. Morgan, “Activated Nitridation of Silicon and the a/3 Ratio,” Energy Materials Coordinating Comnittee (EMACC) Conference on Structural Ceramics, Knoxville, June, 1979.Google Scholar
  11. 11.
    W.A. Fate and M.E. Milberg, “Effects of Fe and Fe Si2 on the Nitriding of Si Powder,” Journal of the American Ceramic Society, V. 62, no. 11–12 pp. 531–2, Nov.-Dec., 1978.Google Scholar
  12. 12.
    R.W. Rice, “Machining of Ceramics” pp. 287–343 in ref. 1.Google Scholar
  13. 13.
    S. Wiederhorn, “Reliability, Life Prediction, and Proof Testing of Ceramics,” pp. 635–664 in ref. 1.Google Scholar

Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • M. E. Rorabaugh
    • 1
  • K. H. Styhr
    • 1
  1. 1.AiResearch Casting CompanyTorranceUSA

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