Phase evolution of matrix of C/SiCN composite during creep testing at 1300 C
Journal Title: Carbon - Science and Technology - Year 2009, Vol 2, Issue 1
Abstract
Tensile creep behavior of carbon fiber-reinforced SiCN matrix composite (C/SiCN) was investigated at 1300 °C under vacuum and 45 MPa for 30 h. As-received and 1700 °C-heat treated samples were prepared. Phase evolution and microstructure of C/SiCN was examined by virtue of X-ray diffraction, scanning electron microscope and high resolution transmission electron microscopy. It was found that crystallization happened in the as-received C/SiCN after 1300 °C creep tested for 1h, though many researches indicate that the crystallization of amorphous SiCN occur above 1400 °C heat treated. The matrix of as-received C/SiCN partly transformed from amorphous to β-SiC firstly and then α-SiC in the temperature range from 0 h to 15 h. The intensity of diffraction peaks had no significant change from 15 h to 30 h.The results revealed the applied stress promotes the occurrence of crystallization in as received C/SiCN. But the 1700 °C-heat treated specimen showed little change of XRD patterns after creep testing.
Authors and Affiliations
Qiang-Qiang Wang, Sheng-Ru Qiao (*), Yi-Xia, Guofeng Lu, Cheng –Yu Zhang
Keywords
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