西南石油大学学报(自然科学版) ›› 1993, Vol. 15 ›› Issue (3): 110-116.DOI: 10.3863/j.issn.1000-2634.1993.03.015

• 石油机械工程 • Previous Articles     Next Articles

TEST STUDY ON HIGH-TEMPERATURE CREEP OF SITICON NITRIDE CERAMICS

Xu Zhiyue J. A. Todd
   

  1. 1.Dept, of Mechanical Eyineering 2.University of Southern California
  • Received:1992-09-25 Revised:1900-01-01 Online:1993-08-20 Published:1993-08-20
  • Contact: Xu Zhi-yue

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Abstract: This paper studies the creep properties of silicon nitride containing 6wt%yttria arid 2wt% ahrmirla in the temperature range of 1300'C to 1400'C .The stress exponent is shown to be 2 and the true activation energy to be 700ks mol-1.The best results and analysis reveal that. the creep mechanism is a diffusion controlled creep mechanism involving nitrogen difus-sion through the grain boundary glassy phase.

Key words: Ceramic composite High-temperature material G

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