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Crystallographic orientation of ZrB 2 ‐ZrC composites manufactured by the spark plasma sintering method
Author(s) -
Shim S. H.,
Niihara K.,
Auh K. H.,
Shim K. B.
Publication year - 2002
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1046/j.1365-2818.2002.00994.x
Subject(s) - spark plasma sintering , materials science , misorientation , electron backscatter diffraction , scanning electron microscope , composite material , sintering , grain boundary , ceramic , diffraction , composite number , microstructure , optics , physics
Summary The crystallographic grain orientation of ZrB 2 ‐ZrC composites manufactured using a spark plasma sintering (SPS) method, a new sintering technique in development for poorly sinterable ceramic materials, was analysed by the scanning electron microscopy‐electron backscattered diffraction (SEM‐EBSD) method. Their crystallographic features have been compared with those of a conventionally sintered specimen using a pressureless sintering (PLS) method. In the composite sintered by PLS, (0001) planes of ZrB 2 were orientated in the direction parallel to the specimen surface (RD) but (10 1 0) and (2 11 0) planes randomly orientated. In the case of SPS, (0001) planes of ZrB 2 were orientated normal to the specimen surface (ND) and weakly to the RD. In both cases of PLS and SPS, ZrC grains had a randomly orientated grain structure. The distribution of grain boundary misorientation of PLS and SPS‐processed composites showed the same tendency that high‐angle boundaries were more prevalent than low‐angle boundaries. But in the case of ZrC grains in the SPS sample, the proportion of CSL boundaries with low sigma value (3, 5, 7, 9, 11) was relatively larger.