Investigation of Al2O3/Cr3C2 composites prepared by pressureless sintering (part 2)

Jow Lay Huang, Kuo Chi Twu, Ding Fwu Lii, Ai Kang Li

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18 Citations (Scopus)

Abstract

Alumina containing Cr3C2 of different sizes and compositions of was pressurelessly sintered at 1550°C for 2 h in 1 atm Ar atmosphere. The fracture toughness values of Al2O3/Cr3C2 composites were consistently observed to be higher than that of monolithic alumina. An optimum toughness of 5.9 MPa m1/2 was obtained for the 30 vol.% Cr3C2(2 μm) / Al2O3 composite. Small Cr3C2 (2 μm) particles had a more positive toughening effect than did large Cr3C2 (7 μm) particles. Cracks were observed to radiate from the Cr3C2 particles. Coalescence and necking of Cr3C2 were observed in composites with high Cr3C2 contents. Pores due to the pull out of Cr3C2 particles were also observed. The observed toughening effects were attributed to the mechanisms of crack deflection and microcracking. Theoretical toughness was calculated and compared with the experimental results.

Original languageEnglish
Pages (from-to)211-215
Number of pages5
JournalMaterials Chemistry and Physics
Volume51
Issue number3
DOIs
Publication statusPublished - 1997 Jul 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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