Interface and defect characterization in hot-pressed ZrB2-SiC ceramics |
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Authors: | Jun LiangYu Wang Songhe Meng |
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Affiliation: | Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, PR China |
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Abstract: | ZrB2 is interesting for thermal protection materials because of favorable thermal stability, mechanical properties and oxidation resistance. ZrB2-20 vol.% SiC composite was prepared by hot-pressing at 2000 °C and 30 MPa. Microstructures and interfacial characterization were investigated by high resolution transmission electron microscopy. SiC polytype was formed as 6H structure in hot-pressed ZrB2-SiC ceramics. Numerous edge dislocations were found in ZrB2 grains. There was no interfacial amorphous layer or transition layer at the ZrB2/6H-SiC interface. Note also that since only one of the constituents (ZrB2 or SiC) was oriented along a proper zone axis, no evident orientation relationship was observed between SiC or ZrB2. |
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Keywords: | ZrB2-SiC ceramics Defect Interface Electron microscopy |
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