Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (9): 961-966.DOI: 10.15541/jim20160638

• Orginal Article • Previous Articles     Next Articles

Oxidation Resistance and Residual Strength of Laminated ZrB2-SiC-G
Ceramics at 1300

  

  • Received:2016-11-25 Revised:2017-02-05 Published:2017-09-30 Online:2017-08-29
  • About author:LIU Xiao-Yan. E-mail: liuxy108110@163.com
  • Supported by:
    Natural Science Foundation of Shandong Province, China(ZR2014JL032)Science and Technology Development Plan of Shandong Province, China(2014GZX201008, 2011SJGZ10)

Abstract:

The laminated ZrB2-SiC-G ultra high temperature ceramic with different graphite interface layers were successfully prepared by tap-casting-stacking-hot press. The oxidation behavior at 1300℃ for 0.5-10 h and the influence of oxidation time on residual strength at room temperature were studied. In addition, the gain weight along with the change of oxidation time was observed, and phase and morphology were analyzed. The results show that the laminated ZrB2-SiC-G ultra high temperature ceramic prepared by adding 40vol%ZrB2 and 10vol% SiC in the graphite interface layer obtains the best mechanical properties with room temperature flexural strength of 670 MPa and the fracture toughness of 13.7 MPa·m1/2. After 10 h oxidation, the flexural strength is still up to 429 MPa, and the fracture toughness is still up to 10.25 MPa·m1/2. The excellent residual strength is attributed to the formation of a dense glass layer of SiO2 on the surface which prevents the internal material from being oxidized.

 

Key words: ZrB2, Laminated ceramics, oxidation, residual strength

CLC Number: